Mercurial > octave-nkf
annotate libinterp/corefcn/file-io.cc @ 17744:d63878346099
maint: Update copyright notices for release.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 23 Oct 2013 22:09:27 -0400 |
parents | 6690dba6078a |
children | 175b392e91fe |
rev | line source |
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1 | 1 /* |
2 | |
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3 Copyright (C) 1993-2013 John W. Eaton |
1 | 4 |
5 This file is part of Octave. | |
6 | |
7 Octave is free software; you can redistribute it and/or modify it | |
8 under the terms of the GNU General Public License as published by the | |
7016 | 9 Free Software Foundation; either version 3 of the License, or (at your |
10 option) any later version. | |
1 | 11 |
12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
7016 | 18 along with Octave; see the file COPYING. If not, see |
19 <http://www.gnu.org/licenses/>. | |
1 | 20 |
21 */ | |
22 | |
2095 | 23 // Originally written by John C. Campbell <jcc@bevo.che.wisc.edu> |
1230 | 24 // |
2095 | 25 // Thomas Baier <baier@ci.tuwien.ac.at> added the original versions of |
26 // the following functions: | |
1230 | 27 // |
2095 | 28 // popen |
29 // pclose | |
30 // execute (now popen2.m) | |
31 // sync_system (now merged with system) | |
32 // async_system (now merged with system) | |
1230 | 33 |
9322 | 34 // Extensively revised by John W. Eaton <jwe@octave.org>, |
2095 | 35 // April 1996. |
1 | 36 |
240 | 37 #ifdef HAVE_CONFIG_H |
1230 | 38 #include <config.h> |
1 | 39 #endif |
40 | |
4797 | 41 #include <cerrno> |
42 #include <cstdio> | |
1343 | 43 |
3503 | 44 #include <iostream> |
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45 #include <limits> |
7336 | 46 #include <stack> |
4726 | 47 #include <vector> |
1350 | 48 |
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49 #include <fcntl.h> |
1230 | 50 #include <sys/types.h> |
1 | 51 #include <unistd.h> |
1350 | 52 |
5325 | 53 #ifdef HAVE_ZLIB_H |
54 #include <zlib.h> | |
55 #endif | |
56 | |
5102 | 57 #include "error.h" |
2926 | 58 #include "file-ops.h" |
6159 | 59 #include "file-stat.h" |
5102 | 60 #include "lo-ieee.h" |
6159 | 61 #include "oct-env.h" |
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62 #include "oct-locbuf.h" |
2926 | 63 |
1352 | 64 #include "defun.h" |
6108 | 65 #include "file-io.h" |
6159 | 66 #include "load-path.h" |
2095 | 67 #include "oct-fstrm.h" |
68 #include "oct-iostrm.h" | |
1377 | 69 #include "oct-map.h" |
1750 | 70 #include "oct-obj.h" |
2095 | 71 #include "oct-prcstrm.h" |
72 #include "oct-stream.h" | |
73 #include "oct-strstrm.h" | |
1 | 74 #include "pager.h" |
444 | 75 #include "sysdep.h" |
1352 | 76 #include "utils.h" |
2370 | 77 #include "variables.h" |
1583 | 78 |
2902 | 79 static octave_value stdin_file; |
80 static octave_value stdout_file; | |
81 static octave_value stderr_file; | |
82 | |
4468 | 83 static octave_stream stdin_stream; |
84 static octave_stream stdout_stream; | |
85 static octave_stream stderr_stream; | |
86 | |
1 | 87 void |
164 | 88 initialize_file_io (void) |
1 | 89 { |
4468 | 90 stdin_stream = octave_istream::create (&std::cin, "stdin"); |
2116 | 91 |
3531 | 92 // This uses octave_stdout (see pager.h), not std::cout so that Octave's |
2116 | 93 // standard output stream will pass through the pager. |
94 | |
4468 | 95 stdout_stream = octave_ostream::create (&octave_stdout, "stdout"); |
2116 | 96 |
4468 | 97 stderr_stream = octave_ostream::create (&std::cerr, "stderr"); |
1 | 98 |
2902 | 99 stdin_file = octave_stream_list::insert (stdin_stream); |
100 stdout_file = octave_stream_list::insert (stdout_stream); | |
101 stderr_file = octave_stream_list::insert (stderr_stream); | |
1 | 102 } |
103 | |
2095 | 104 void |
105 close_files (void) | |
1 | 106 { |
2095 | 107 octave_stream_list::clear (); |
108 } | |
636 | 109 |
5102 | 110 // List of files to delete when we exit or crash. |
111 // | |
5775 | 112 // FIXME -- this should really be static, but that causes |
5102 | 113 // problems on some systems. |
114 std::stack <std::string> tmp_files; | |
115 | |
116 void | |
117 mark_for_deletion (const std::string& file) | |
118 { | |
119 tmp_files.push (file); | |
120 } | |
121 | |
122 void | |
123 cleanup_tmp_files (void) | |
124 { | |
125 while (! tmp_files.empty ()) | |
126 { | |
127 std::string filename = tmp_files.top (); | |
128 tmp_files.pop (); | |
10411 | 129 gnulib::unlink (filename.c_str ()); |
5102 | 130 } |
131 } | |
132 | |
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133 static void |
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134 normalize_fopen_mode (std::string& mode, bool& use_zlib) |
1 | 135 { |
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136 use_zlib = false; |
896 | 137 |
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138 if (! mode.empty ()) |
368 | 139 { |
2095 | 140 // Could probably be faster, but does it really matter? |
1766 | 141 |
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142 // Accept 'W', 'R', and 'A' as 'w', 'r', and 'a' but we warn about |
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143 // them because Matlab says they don't perform "automatic |
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144 // flushing" but we don't know precisely what action that implies. |
7078 | 145 |
146 size_t pos = mode.find ('W'); | |
147 | |
8021 | 148 if (pos != std::string::npos) |
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149 { |
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150 warning_with_id ("Octave:fopen-mode", |
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151 "fopen: treating mode \"W\" as equivalent to \"w\""); |
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152 mode[pos] = 'w'; |
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153 } |
7078 | 154 |
155 pos = mode.find ('R'); | |
156 | |
8021 | 157 if (pos != std::string::npos) |
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158 { |
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159 warning_with_id ("Octave:fopen-mode", |
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160 "fopen: treating mode \"R\" as equivalent to \"r\""); |
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161 mode[pos] = 'r'; |
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162 } |
7078 | 163 |
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164 pos = mode.find ('A'); |
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165 |
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166 if (pos != std::string::npos) |
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167 { |
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168 warning_with_id ("Octave:fopen-mode", |
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169 "fopen: treating mode \"A\" as equivalent to \"a\""); |
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170 mode[pos] = 'a'; |
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171 } |
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172 |
7078 | 173 pos = mode.find ('z'); |
5325 | 174 |
8021 | 175 if (pos != std::string::npos) |
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176 { |
5325 | 177 #if defined (HAVE_ZLIB) |
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178 use_zlib = true; |
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179 mode.erase (pos, 1); |
5325 | 180 #else |
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181 error ("this version of Octave does not support gzipped files"); |
5325 | 182 #endif |
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183 } |
5325 | 184 |
185 if (! error_state) | |
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186 { |
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187 // Use binary mode if 't' is not specified, but don't add |
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188 // 'b' if it is already present. |
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189 |
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190 size_t bpos = mode.find ('b'); |
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191 size_t tpos = mode.find ('t'); |
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192 |
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193 if (bpos == std::string::npos && tpos == std::string::npos) |
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194 mode += 'b'; |
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195 } |
1 | 196 } |
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197 } |
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198 |
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199 static std::ios::openmode |
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200 fopen_mode_to_ios_mode (const std::string& mode) |
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201 { |
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202 std::ios::openmode retval = std::ios::in; |
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203 |
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204 if (! error_state) |
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205 { |
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206 if (mode == "rt") |
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207 retval = std::ios::in; |
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208 else if (mode == "wt") |
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209 retval = std::ios::out | std::ios::trunc; |
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210 else if (mode == "at") |
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211 retval = std::ios::out | std::ios::app; |
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212 else if (mode == "r+t" || mode == "rt+") |
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213 retval = std::ios::in | std::ios::out; |
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214 else if (mode == "w+t" || mode == "wt+") |
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215 retval = std::ios::in | std::ios::out | std::ios::trunc; |
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216 else if (mode == "a+t" || mode == "at+") |
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217 retval = std::ios::in | std::ios::out | std::ios::app; |
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218 else if (mode == "rb" || mode == "r") |
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219 retval = std::ios::in | std::ios::binary; |
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220 else if (mode == "wb" || mode == "w") |
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221 retval = std::ios::out | std::ios::trunc | std::ios::binary; |
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222 else if (mode == "ab" || mode == "a") |
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223 retval = std::ios::out | std::ios::app | std::ios::binary; |
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224 else if (mode == "r+b" || mode == "rb+" || mode == "r+") |
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225 retval = std::ios::in | std::ios::out | std::ios::binary; |
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226 else if (mode == "w+b" || mode == "wb+" || mode == "w+") |
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227 retval = (std::ios::in | std::ios::out | std::ios::trunc |
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228 | std::ios::binary); |
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229 else if (mode == "a+b" || mode == "ab+" || mode == "a+") |
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230 retval = (std::ios::in | std::ios::out | std::ios::app |
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231 | std::ios::binary); |
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232 else |
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233 ::error ("invalid mode specified"); |
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234 } |
1 | 235 |
236 return retval; | |
237 } | |
238 | |
1957 | 239 DEFUN (fclose, args, , |
3372 | 240 "-*- texinfo -*-\n\ |
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241 @deftypefn {Built-in Function} {} fclose (@var{fid})\n\ |
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242 @deftypefnx {Built-in Function} {} fclose (\"all\")\n\ |
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243 Close the specified file. If successful, @code{fclose} returns 0,\n\ |
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244 otherwise, it returns -1. The second form of the @code{fclose} call closes\n\ |
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245 all open files except @code{stdout}, @code{stderr}, and @code{stdin}.\n\ |
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246 @seealso{fopen, freport}\n\ |
5642 | 247 @end deftypefn") |
529 | 248 { |
4233 | 249 octave_value retval = -1; |
529 | 250 |
251 int nargin = args.length (); | |
252 | |
2095 | 253 if (nargin == 1) |
4233 | 254 retval = octave_stream_list::remove (args(0), "fclose"); |
1 | 255 else |
5823 | 256 print_usage (); |
1 | 257 |
258 return retval; | |
259 } | |
260 | |
5144 | 261 DEFUN (fclear, args, , |
262 "-*- texinfo -*-\n\ | |
263 @deftypefn {Built-in Function} {} fclear (@var{fid})\n\ | |
264 Clear the stream state for the specified file.\n\ | |
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265 @seealso{fopen}\n\ |
5144 | 266 @end deftypefn") |
267 { | |
268 octave_value retval; | |
269 | |
270 int nargin = args.length (); | |
271 | |
272 if (nargin == 1) | |
273 { | |
274 int fid = octave_stream_list::get_file_number (args (0)); | |
275 | |
276 octave_stream os = octave_stream_list::lookup (fid, "fclear"); | |
277 | |
278 if (! error_state) | |
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279 os.clearerr (); |
5144 | 280 } |
281 else | |
5823 | 282 print_usage (); |
5144 | 283 |
284 return retval; | |
285 } | |
286 | |
1957 | 287 DEFUN (fflush, args, , |
3372 | 288 "-*- texinfo -*-\n\ |
289 @deftypefn {Built-in Function} {} fflush (@var{fid})\n\ | |
290 Flush output to @var{fid}. This is useful for ensuring that all\n\ | |
291 pending output makes it to the screen before some other event occurs.\n\ | |
292 For example, it is always a good idea to flush the standard output\n\ | |
293 stream before calling @code{input}.\n\ | |
5095 | 294 \n\ |
295 @code{fflush} returns 0 on success and an OS dependent error value\n\ | |
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296 (@minus{}1 on Unix) on error.\n\ |
5642 | 297 @seealso{fopen, fclose}\n\ |
298 @end deftypefn") | |
1181 | 299 { |
4233 | 300 octave_value retval = -1; |
1181 | 301 |
302 int nargin = args.length (); | |
303 | |
2095 | 304 if (nargin == 1) |
305 { | |
5775 | 306 // FIXME -- any way to avoid special case for stdout? |
2609 | 307 |
308 int fid = octave_stream_list::get_file_number (args (0)); | |
309 | |
310 if (fid == 1) | |
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311 { |
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312 flush_octave_stdout (); |
2095 | 313 |
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314 retval = 0; |
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315 } |
2095 | 316 else |
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317 { |
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318 octave_stream os = octave_stream_list::lookup (fid, "fflush"); |
2609 | 319 |
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320 if (! error_state) |
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321 retval = os.flush (); |
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322 } |
2095 | 323 } |
324 else | |
5823 | 325 print_usage (); |
1181 | 326 |
327 return retval; | |
328 } | |
329 | |
2095 | 330 DEFUN (fgetl, args, , |
3372 | 331 "-*- texinfo -*-\n\ |
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332 @deftypefn {Built-in Function} {@var{str} =} fgetl (@var{fid})\n\ |
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333 @deftypefnx {Built-in Function} {@var{str} =} fgetl (@var{fid}, @var{len})\n\ |
3372 | 334 Read characters from a file, stopping after a newline, or EOF,\n\ |
335 or @var{len} characters have been read. The characters read, excluding\n\ | |
336 the possible trailing newline, are returned as a string.\n\ | |
1339 | 337 \n\ |
3372 | 338 If @var{len} is omitted, @code{fgetl} reads until the next newline\n\ |
339 character.\n\ | |
340 \n\ | |
341 If there are no more characters to read, @code{fgetl} returns @minus{}1.\n\ | |
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342 \n\ |
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343 To read a line and return the terminating newline see @code{fgets}.\n\ |
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344 @seealso{fgets, fscanf, fread, fopen}\n\ |
5642 | 345 @end deftypefn") |
1339 | 346 { |
4468 | 347 static std::string who = "fgetl"; |
348 | |
2599 | 349 octave_value_list retval; |
350 | |
4233 | 351 retval(1) = 0; |
352 retval(0) = -1; | |
1339 | 353 |
354 int nargin = args.length (); | |
355 | |
356 if (nargin == 1 || nargin == 2) | |
2095 | 357 { |
4468 | 358 octave_stream os = octave_stream_list::lookup (args(0), who); |
2095 | 359 |
3341 | 360 if (! error_state) |
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361 { |
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362 octave_value len_arg = (nargin == 2) ? args(1) : octave_value (); |
2095 | 363 |
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364 bool err = false; |
2095 | 365 |
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366 std::string tmp = os.getl (len_arg, err, who); |
2095 | 367 |
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368 if (! (error_state || err)) |
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369 { |
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370 retval(1) = tmp.length (); |
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371 retval(0) = tmp; |
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372 } |
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373 } |
2095 | 374 } |
1339 | 375 else |
5823 | 376 print_usage (); |
1339 | 377 |
378 return retval; | |
379 } | |
380 | |
2095 | 381 DEFUN (fgets, args, , |
3372 | 382 "-*- texinfo -*-\n\ |
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383 @deftypefn {Built-in Function} {@var{str} =} fgets (@var{fid})\n\ |
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384 @deftypefnx {Built-in Function} {@var{str} =} fgets (@var{fid}, @var{len})\n\ |
3372 | 385 Read characters from a file, stopping after a newline, or EOF,\n\ |
386 or @var{len} characters have been read. The characters read, including\n\ | |
387 the possible trailing newline, are returned as a string.\n\ | |
529 | 388 \n\ |
3372 | 389 If @var{len} is omitted, @code{fgets} reads until the next newline\n\ |
390 character.\n\ | |
391 \n\ | |
392 If there are no more characters to read, @code{fgets} returns @minus{}1.\n\ | |
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393 \n\ |
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394 To read a line and discard the terminating newline see @code{fgetl}.\n\ |
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395 @seealso{fputs, fgetl, fscanf, fread, fopen}\n\ |
5642 | 396 @end deftypefn") |
529 | 397 { |
4468 | 398 static std::string who = "fgets"; |
399 | |
2599 | 400 octave_value_list retval; |
401 | |
402 retval(1) = 0.0; | |
403 retval(0) = -1.0; | |
529 | 404 |
405 int nargin = args.length (); | |
406 | |
1338 | 407 if (nargin == 1 || nargin == 2) |
2095 | 408 { |
4468 | 409 octave_stream os = octave_stream_list::lookup (args(0), who); |
2095 | 410 |
3341 | 411 if (! error_state) |
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412 { |
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413 octave_value len_arg = (nargin == 2) ? args(1) : octave_value (); |
2095 | 414 |
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415 bool err = false; |
2095 | 416 |
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417 std::string tmp = os.gets (len_arg, err, who); |
2095 | 418 |
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419 if (! (error_state || err)) |
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420 { |
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421 retval(1) = tmp.length (); |
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422 retval(0) = tmp; |
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423 } |
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424 } |
2095 | 425 } |
1338 | 426 else |
5823 | 427 print_usage (); |
529 | 428 |
429 return retval; | |
430 } | |
431 | |
9701 | 432 DEFUN (fskipl, args, , |
433 "-*- texinfo -*-\n\ | |
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434 @deftypefn {Built-in Function} {@var{nlines} =} fskipl (@var{fid})\n\ |
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435 @deftypefnx {Built-in Function} {@var{nlines} =} fskipl (@var{fid}, @var{count})\n\ |
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436 @deftypefnx {Built-in Function} {@var{nlines} =} fskipl (@var{fid}, Inf)\n\ |
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437 Read and skip @var{count} lines from the file descriptor @var{fid}.\n\ |
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438 @code{fskipl} discards characters until an end-of-line is encountered exactly\n\ |
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439 @var{count}-times, or until the end-of-file marker is found.\n\ |
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440 \n\ |
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441 If @var{count} is omitted, it defaults to 1. @var{count} may also be\n\ |
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442 @code{Inf}, in which case lines are skipped until the end of the file.\n\ |
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443 This form is suitable for counting the number of lines in a file.\n\ |
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444 \n\ |
9701 | 445 Returns the number of lines skipped (end-of-line sequences encountered).\n\ |
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446 @seealso{fgetl, fgets, fscanf, fopen}\n\ |
9701 | 447 @end deftypefn") |
448 { | |
449 static std::string who = "fskipl"; | |
450 | |
451 octave_value retval; | |
452 | |
453 int nargin = args.length (); | |
454 | |
455 if (nargin == 1 || nargin == 2) | |
456 { | |
457 octave_stream os = octave_stream_list::lookup (args(0), who); | |
458 | |
459 if (! error_state) | |
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460 { |
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461 octave_value count_arg = (nargin == 2) ? args(1) : octave_value (); |
9701 | 462 |
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463 bool err = false; |
9701 | 464 |
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465 off_t tmp = os.skipl (count_arg, err, who); |
9701 | 466 |
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467 if (! (error_state || err)) |
9701 | 468 retval = tmp; |
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469 } |
9701 | 470 } |
471 else | |
472 print_usage (); | |
473 | |
474 return retval; | |
475 } | |
476 | |
477 | |
3340 | 478 static octave_stream |
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479 do_stream_open (const std::string& name, const std::string& mode_arg, |
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480 const std::string& arch, int& fid) |
1 | 481 { |
3340 | 482 octave_stream retval; |
1 | 483 |
2095 | 484 fid = -1; |
1 | 485 |
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486 std::string mode = mode_arg; |
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487 bool use_zlib = false; |
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488 normalize_fopen_mode (mode, use_zlib); |
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489 |
4036 | 490 std::ios::openmode md = fopen_mode_to_ios_mode (mode); |
1 | 491 |
2095 | 492 if (! error_state) |
493 { | |
2318 | 494 oct_mach_info::float_format flt_fmt = |
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495 oct_mach_info::string_to_float_format (arch); |
1 | 496 |
4798 | 497 if (! error_state) |
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498 { |
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499 std::string fname = file_ops::tilde_expand (name); |
6159 | 500 |
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501 file_stat fs (fname); |
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502 |
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503 if (! (md & std::ios::out |
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504 || octave_env::absolute_pathname (fname) |
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505 || octave_env::rooted_relative_pathname (fname))) |
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506 { |
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507 if (! fs.exists ()) |
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508 { |
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509 std::string tmp |
10250 | 510 = octave_env::make_absolute (load_path::find_file (fname)); |
6159 | 511 |
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512 if (! tmp.empty ()) |
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513 { |
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514 warning_with_id ("Octave:fopen-file-in-path", |
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515 "fopen: file found in load path"); |
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516 fname = tmp; |
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517 } |
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518 } |
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519 } |
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520 |
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521 if (! fs.is_dir ()) |
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522 { |
6905 | 523 #if defined (HAVE_ZLIB) |
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524 if (use_zlib) |
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525 { |
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526 FILE *fptr = gnulib::fopen (fname.c_str (), mode.c_str ()); |
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527 |
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528 int fd = fileno (fptr); |
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529 |
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530 gzFile gzf = ::gzdopen (fd, mode.c_str ()); |
5325 | 531 |
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532 if (fptr) |
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533 retval = octave_zstdiostream::create (fname, gzf, fd, |
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534 md, flt_fmt); |
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535 else |
10411 | 536 retval.error (gnulib::strerror (errno)); |
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537 } |
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538 else |
5325 | 539 #endif |
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540 { |
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541 FILE *fptr = gnulib::fopen (fname.c_str (), mode.c_str ()); |
5325 | 542 |
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543 retval = octave_stdiostream::create (fname, fptr, md, flt_fmt); |
5370 | 544 |
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545 if (! fptr) |
10411 | 546 retval.error (gnulib::strerror (errno)); |
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547 } |
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548 |
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549 } |
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550 } |
1 | 551 } |
552 | |
2095 | 553 return retval; |
554 } | |
1 | 555 |
3340 | 556 static octave_stream |
2095 | 557 do_stream_open (const octave_value& tc_name, const octave_value& tc_mode, |
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558 const octave_value& tc_arch, const char *fcn, int& fid) |
2095 | 559 { |
3340 | 560 octave_stream retval; |
2095 | 561 |
562 fid = -1; | |
563 | |
3523 | 564 std::string name = tc_name.string_value (); |
2095 | 565 |
566 if (! error_state) | |
1 | 567 { |
3523 | 568 std::string mode = tc_mode.string_value (); |
2095 | 569 |
570 if (! error_state) | |
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571 { |
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572 std::string arch = tc_arch.string_value (); |
1 | 573 |
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574 if (! error_state) |
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575 retval = do_stream_open (name, mode, arch, fid); |
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576 else |
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577 ::error ("%s: architecture type must be a string", fcn); |
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578 } |
2095 | 579 else |
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580 ::error ("%s: file mode must be a string", fcn); |
1 | 581 } |
2095 | 582 else |
583 ::error ("%s: file name must be a string", fcn); | |
1 | 584 |
585 return retval; | |
586 } | |
587 | |
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588 DEFUN (fopen, args, nargout, |
3372 | 589 "-*- texinfo -*-\n\ |
10840 | 590 @deftypefn {Built-in Function} {[@var{fid}, @var{msg}] =} fopen (@var{name}, @var{mode}, @var{arch})\n\ |
3372 | 591 @deftypefnx {Built-in Function} {@var{fid_list} =} fopen (\"all\")\n\ |
5353 | 592 @deftypefnx {Built-in Function} {[@var{file}, @var{mode}, @var{arch}] =} fopen (@var{fid})\n\ |
3372 | 593 The first form of the @code{fopen} function opens the named file with\n\ |
594 the specified mode (read-write, read-only, etc.) and architecture\n\ | |
595 interpretation (IEEE big endian, IEEE little endian, etc.), and returns\n\ | |
596 an integer value that may be used to refer to the file later. If an\n\ | |
597 error occurs, @var{fid} is set to @minus{}1 and @var{msg} contains the\n\ | |
598 corresponding system error message. The @var{mode} is a one or two\n\ | |
599 character string that specifies whether the file is to be opened for\n\ | |
600 reading, writing, or both.\n\ | |
1181 | 601 \n\ |
3372 | 602 The second form of the @code{fopen} function returns a vector of file ids\n\ |
603 corresponding to all the currently open files, excluding the\n\ | |
604 @code{stdin}, @code{stdout}, and @code{stderr} streams.\n\ | |
2318 | 605 \n\ |
5353 | 606 The third form of the @code{fopen} function returns information about the\n\ |
607 open file given its file id.\n\ | |
1181 | 608 \n\ |
3372 | 609 For example,\n\ |
610 \n\ | |
611 @example\n\ | |
612 myfile = fopen (\"splat.dat\", \"r\", \"ieee-le\");\n\ | |
613 @end example\n\ | |
2095 | 614 \n\ |
3372 | 615 @noindent\n\ |
616 opens the file @file{splat.dat} for reading. If necessary, binary\n\ | |
617 numeric values will be read assuming they are stored in IEEE format with\n\ | |
618 the least significant bit first, and then converted to the native\n\ | |
619 representation.\n\ | |
2318 | 620 \n\ |
3372 | 621 Opening a file that is already open simply opens it again and returns a\n\ |
622 separate file id. It is not an error to open a file several times,\n\ | |
623 though writing to the same file through several different file ids may\n\ | |
624 produce unexpected results.\n\ | |
625 \n\ | |
626 The possible values @samp{mode} may have are\n\ | |
627 \n\ | |
628 @table @asis\n\ | |
629 @item @samp{r}\n\ | |
630 Open a file for reading.\n\ | |
3263 | 631 \n\ |
3372 | 632 @item @samp{w}\n\ |
7001 | 633 Open a file for writing. The previous contents are discarded.\n\ |
3372 | 634 \n\ |
635 @item @samp{a}\n\ | |
636 Open or create a file for writing at the end of the file.\n\ | |
637 \n\ | |
638 @item @samp{r+}\n\ | |
639 Open an existing file for reading and writing.\n\ | |
640 \n\ | |
641 @item @samp{w+}\n\ | |
642 Open a file for reading or writing. The previous contents are\n\ | |
643 discarded.\n\ | |
644 \n\ | |
645 @item @samp{a+}\n\ | |
646 Open or create a file for reading or writing at the end of the\n\ | |
647 file.\n\ | |
648 @end table\n\ | |
649 \n\ | |
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650 Append a @qcode{\"t\"} to the mode string to open the file in text mode or a\n\ |
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651 @qcode{\"b\"} to open in binary mode. On Windows and Macintosh systems, text\n\ |
4865 | 652 mode reading and writing automatically converts linefeeds to the\n\ |
653 appropriate line end character for the system (carriage-return linefeed\n\ | |
6665 | 654 on Windows, carriage-return on Macintosh). The default if no mode is\n\ |
4865 | 655 specified is binary mode.\n\ |
656 \n\ | |
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657 Additionally, you may append a @qcode{\"z\"} to the mode string to open a\n\ |
5325 | 658 gzipped file for reading or writing. For this to be successful, you\n\ |
659 must also open the file in binary mode.\n\ | |
660 \n\ | |
3372 | 661 The parameter @var{arch} is a string specifying the default data format\n\ |
662 for the file. Valid values for @var{arch} are:\n\ | |
2318 | 663 \n\ |
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664 @table @samp\n\ |
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665 @item native\n\ |
3372 | 666 The format of the current machine (this is the default).\n\ |
667 \n\ | |
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668 @item ieee-be\n\ |
3372 | 669 IEEE big endian format.\n\ |
670 \n\ | |
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671 @item ieee-le\n\ |
3372 | 672 IEEE little endian format.\n\ |
673 @end table\n\ | |
674 \n\ | |
675 @noindent\n\ | |
676 however, conversions are currently only supported for @samp{native}\n\ | |
677 @samp{ieee-be}, and @samp{ieee-le} formats.\n\ | |
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678 @seealso{fclose, fgets, fgetl, fscanf, fread, fputs, fdisp, fprintf, fwrite, fskipl, fseek, frewind, ftell, feof, ferror, fclear, fflush, freport}\n\ |
5642 | 679 @end deftypefn") |
529 | 680 { |
2599 | 681 octave_value_list retval; |
682 | |
683 retval(0) = -1.0; | |
529 | 684 |
685 int nargin = args.length (); | |
686 | |
2095 | 687 if (nargin == 1) |
688 { | |
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689 if (args(0).is_string ()) |
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690 { |
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691 // If there is only one argument and it is a string but it |
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692 // is not the string "all", we assume it is a file to open |
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693 // with MODE = "r". To open a file called "all", you have |
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694 // to supply more than one argument. |
3263 | 695 |
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696 if (nargout < 2 && args(0).string_value () == "all") |
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697 return octave_stream_list::open_file_numbers (); |
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698 } |
2095 | 699 else |
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700 { |
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701 string_vector tmp = octave_stream_list::get_info (args(0)); |
529 | 702 |
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703 if (! error_state) |
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704 { |
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705 retval(2) = tmp(2); |
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706 retval(1) = tmp(1); |
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707 retval(0) = tmp(0); |
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708 } |
3263 | 709 |
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710 return retval; |
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711 } |
1 | 712 } |
713 | |
2095 | 714 if (nargin > 0 && nargin < 4) |
715 { | |
716 octave_value mode = (nargin == 2 || nargin == 3) | |
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717 ? args(1) : octave_value ("r"); |
2095 | 718 |
719 octave_value arch = (nargin == 3) | |
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720 ? args(2) : octave_value ("native"); |
2095 | 721 |
722 int fid = -1; | |
723 | |
3340 | 724 octave_stream os = do_stream_open (args(0), mode, arch, "fopen", fid); |
2095 | 725 |
5370 | 726 if (os && ! error_state) |
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727 { |
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728 retval(1) = ""; |
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729 retval(0) = octave_stream_list::insert (os); |
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730 } |
2095 | 731 else |
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732 { |
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733 int error_number = 0; |
5370 | 734 |
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735 retval(1) = os.error (false, error_number); |
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736 retval(0) = -1.0; |
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737 } |
2095 | 738 } |
739 else | |
5823 | 740 print_usage (); |
1 | 741 |
742 return retval; | |
743 } | |
744 | |
1957 | 745 DEFUN (freport, args, , |
3372 | 746 "-*- texinfo -*-\n\ |
747 @deftypefn {Built-in Function} {} freport ()\n\ | |
748 Print a list of which files have been opened, and whether they are open\n\ | |
10840 | 749 for reading, writing, or both. For example:\n\ |
3372 | 750 \n\ |
751 @example\n\ | |
752 @group\n\ | |
753 freport ()\n\ | |
754 \n\ | |
755 @print{} number mode name\n\ | |
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756 @print{}\n\ |
3372 | 757 @print{} 0 r stdin\n\ |
758 @print{} 1 w stdout\n\ | |
759 @print{} 2 w stderr\n\ | |
760 @print{} 3 r myfile\n\ | |
761 @end group\n\ | |
762 @end example\n\ | |
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763 @seealso{fopen, fclose}\n\ |
3372 | 764 @end deftypefn") |
1181 | 765 { |
2095 | 766 octave_value_list retval; |
1181 | 767 |
768 int nargin = args.length (); | |
769 | |
770 if (nargin > 0) | |
771 warning ("freport: ignoring extra arguments"); | |
772 | |
2095 | 773 octave_stdout << octave_stream_list::list_open_files (); |
1181 | 774 |
775 return retval; | |
776 } | |
777 | |
4715 | 778 DEFUN (frewind, args, nargout, |
3372 | 779 "-*- texinfo -*-\n\ |
780 @deftypefn {Built-in Function} {} frewind (@var{fid})\n\ | |
781 Move the file pointer to the beginning of the file @var{fid}, returning\n\ | |
4715 | 782 0 for success, and -1 if an error was encountered. It is equivalent to\n\ |
3372 | 783 @code{fseek (@var{fid}, 0, SEEK_SET)}.\n\ |
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784 @seealso{fseek, ftell, fopen}\n\ |
3372 | 785 @end deftypefn") |
529 | 786 { |
4715 | 787 octave_value retval; |
788 | |
789 int result = -1; | |
1 | 790 |
506 | 791 int nargin = args.length (); |
792 | |
2095 | 793 if (nargin == 1) |
1086 | 794 { |
3341 | 795 octave_stream os = octave_stream_list::lookup (args(0), "frewind"); |
636 | 796 |
3341 | 797 if (! error_state) |
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798 result = os.rewind (); |
1 | 799 } |
800 else | |
5823 | 801 print_usage (); |
1 | 802 |
4715 | 803 if (nargout > 0) |
804 retval = result; | |
805 | |
1 | 806 return retval; |
807 } | |
808 | |
1957 | 809 DEFUN (fseek, args, , |
3372 | 810 "-*- texinfo -*-\n\ |
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811 @deftypefn {Built-in Function} {} fseek (@var{fid}, @var{offset})\n\ |
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812 @deftypefnx {Built-in Function} {} fseek (@var{fid}, @var{offset}, @var{origin})\n\ |
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813 @deftypefnx {Built-in Function} {@var{status} =} fseek (@dots{})\n\ |
5095 | 814 Set the file pointer to any location within the file @var{fid}.\n\ |
815 \n\ | |
816 The pointer is positioned @var{offset} characters from the @var{origin},\n\ | |
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817 which may be one of the predefined variables @w{@code{SEEK_CUR}} (current\n\ |
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818 position), @w{@code{SEEK_SET}} (beginning), or @w{@code{SEEK_END}} (end of\n\ |
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819 file) or strings @qcode{\"cof\"}, @qcode{\"bof\"} or @qcode{\"eof\"}. If\n\ |
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820 @var{origin} is omitted, @w{@code{SEEK_SET}} is assumed. @var{offset} may\n\ |
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821 be positive, negative, or zero but not all combinations of @var{origin} and\n\ |
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822 @var{offset} can be realized.\n\ |
5095 | 823 \n\ |
824 Return 0 on success and -1 on error.\n\ | |
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825 @seealso{fskipl, frewind, ftell, fopen}\n\ |
5642 | 826 @end deftypefn") |
529 | 827 { |
4233 | 828 octave_value retval = -1; |
529 | 829 |
830 int nargin = args.length (); | |
831 | |
2095 | 832 if (nargin == 2 || nargin == 3) |
833 { | |
3341 | 834 octave_stream os = octave_stream_list::lookup (args(0), "fseek"); |
1181 | 835 |
3341 | 836 if (! error_state) |
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837 { |
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838 octave_value origin_arg = (nargin == 3) |
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839 ? args(2) : octave_value (-1.0); |
1 | 840 |
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841 retval = os.seek (args(1), origin_arg); |
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842 } |
368 | 843 } |
2095 | 844 else |
5823 | 845 print_usage (); |
1 | 846 |
847 return retval; | |
848 } | |
849 | |
1957 | 850 DEFUN (ftell, args, , |
3372 | 851 "-*- texinfo -*-\n\ |
852 @deftypefn {Built-in Function} {} ftell (@var{fid})\n\ | |
853 Return the position of the file pointer as the number of characters\n\ | |
854 from the beginning of the file @var{fid}.\n\ | |
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855 @seealso{fseek, feof, fopen}\n\ |
5642 | 856 @end deftypefn") |
1181 | 857 { |
4797 | 858 octave_value retval = -1; |
1 | 859 |
506 | 860 int nargin = args.length (); |
861 | |
2095 | 862 if (nargin == 1) |
1 | 863 { |
3341 | 864 octave_stream os = octave_stream_list::lookup (args(0), "ftell"); |
1 | 865 |
3341 | 866 if (! error_state) |
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867 retval = os.tell (); |
1 | 868 } |
869 else | |
5823 | 870 print_usage (); |
1 | 871 |
872 return retval; | |
873 } | |
874 | |
3737 | 875 DEFUN (fprintf, args, nargout, |
3372 | 876 "-*- texinfo -*-\n\ |
877 @deftypefn {Built-in Function} {} fprintf (@var{fid}, @var{template}, @dots{})\n\ | |
878 This function is just like @code{printf}, except that the output is\n\ | |
879 written to the stream @var{fid} instead of @code{stdout}.\n\ | |
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880 If @var{fid} is omitted, the output is written to @code{stdout}.\n\ |
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881 @seealso{fputs, fdisp, fwrite, fscanf, printf, sprintf, fopen}\n\ |
5642 | 882 @end deftypefn") |
1181 | 883 { |
4468 | 884 static std::string who = "fprintf"; |
885 | |
4715 | 886 octave_value retval; |
887 | |
888 int result = -1; | |
4468 | 889 |
1181 | 890 int nargin = args.length (); |
891 | |
2875 | 892 if (nargin > 1 || (nargin > 0 && args(0).is_string ())) |
2095 | 893 { |
3340 | 894 octave_stream os; |
2873 | 895 int fmt_n = 0; |
896 | |
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897 if (args(0).is_string ()) |
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898 { |
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899 os = octave_stream_list::lookup (1, who); |
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900 } |
2873 | 901 else |
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902 { |
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903 fmt_n = 1; |
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904 os = octave_stream_list::lookup (args(0), who); |
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905 } |
2095 | 906 |
3341 | 907 if (! error_state) |
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908 { |
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909 if (args(fmt_n).is_string ()) |
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910 { |
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911 octave_value_list tmp_args; |
2095 | 912 |
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913 if (nargin > 1 + fmt_n) |
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914 { |
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915 tmp_args.resize (nargin-fmt_n-1, octave_value ()); |
2095 | 916 |
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917 for (int i = fmt_n + 1; i < nargin; i++) |
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918 tmp_args(i-fmt_n-1) = args(i); |
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919 } |
2095 | 920 |
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921 result = os.printf (args(fmt_n), tmp_args, who); |
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922 } |
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923 else |
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924 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
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925 } |
2095 | 926 } |
927 else | |
5823 | 928 print_usage (); |
1181 | 929 |
4715 | 930 if (nargout > 0) |
931 retval = result; | |
932 | |
933 return retval; | |
1181 | 934 } |
935 | |
4715 | 936 DEFUN (printf, args, nargout, |
4468 | 937 "-*- texinfo -*-\n\ |
5095 | 938 @deftypefn {Built-in Function} {} printf (@var{template}, @dots{})\n\ |
4468 | 939 Print optional arguments under the control of the template string\n\ |
5653 | 940 @var{template} to the stream @code{stdout} and return the number of\n\ |
941 characters printed.\n\ | |
942 @ifclear OCTAVE_MANUAL\n\ | |
5095 | 943 \n\ |
5653 | 944 See the Formatted Output section of the GNU Octave manual for a\n\ |
945 complete description of the syntax of the template string.\n\ | |
946 @end ifclear\n\ | |
5642 | 947 @seealso{fprintf, sprintf, scanf}\n\ |
948 @end deftypefn") | |
4468 | 949 { |
950 static std::string who = "printf"; | |
951 | |
4715 | 952 octave_value retval; |
953 | |
954 int result = -1; | |
4468 | 955 |
956 int nargin = args.length (); | |
957 | |
958 if (nargin > 0) | |
959 { | |
960 if (args(0).is_string ()) | |
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961 { |
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962 octave_value_list tmp_args; |
4468 | 963 |
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964 if (nargin > 1) |
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965 { |
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966 tmp_args.resize (nargin-1, octave_value ()); |
4468 | 967 |
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968 for (int i = 1; i < nargin; i++) |
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969 tmp_args(i-1) = args(i); |
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970 } |
4468 | 971 |
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972 result = stdout_stream.printf (args(0), tmp_args, who); |
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973 } |
4468 | 974 else |
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975 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
4468 | 976 } |
977 else | |
5823 | 978 print_usage (); |
4468 | 979 |
4715 | 980 if (nargout > 0) |
981 retval = result; | |
982 | |
4468 | 983 return retval; |
984 } | |
985 | |
2095 | 986 DEFUN (fputs, args, , |
3372 | 987 "-*- texinfo -*-\n\ |
988 @deftypefn {Built-in Function} {} fputs (@var{fid}, @var{string})\n\ | |
989 Write a string to a file with no formatting.\n\ | |
5095 | 990 \n\ |
991 Return a non-negative number on success and EOF on error.\n\ | |
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992 @seealso{fdisp, fprintf, fwrite, fopen}\n\ |
3372 | 993 @end deftypefn") |
1181 | 994 { |
4468 | 995 static std::string who = "fputs"; |
996 | |
4233 | 997 octave_value retval = -1; |
1181 | 998 |
999 int nargin = args.length (); | |
1000 | |
2095 | 1001 if (nargin == 2) |
1002 { | |
4468 | 1003 octave_stream os = octave_stream_list::lookup (args(0), who); |
1181 | 1004 |
3341 | 1005 if (! error_state) |
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1006 retval = os.puts (args(1), who); |
2095 | 1007 } |
1181 | 1008 else |
5823 | 1009 print_usage (); |
4468 | 1010 |
1011 return retval; | |
1012 } | |
1013 | |
1014 DEFUN (puts, args, , | |
1015 "-*- texinfo -*-\n\ | |
1016 @deftypefn {Built-in Function} {} puts (@var{string})\n\ | |
1017 Write a string to the standard output with no formatting.\n\ | |
5095 | 1018 \n\ |
1019 Return a non-negative number on success and EOF on error.\n\ | |
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1020 @seealso{fputs, disp}\n\ |
4468 | 1021 @end deftypefn") |
1022 { | |
1023 static std::string who = "puts"; | |
1024 | |
1025 octave_value retval = -1; | |
1026 | |
1027 if (args.length () == 1) | |
1028 retval = stdout_stream.puts (args(0), who); | |
1029 else | |
5823 | 1030 print_usage (); |
1181 | 1031 |
1032 return retval; | |
1033 } | |
1034 | |
2095 | 1035 DEFUN (sprintf, args, , |
3372 | 1036 "-*- texinfo -*-\n\ |
1037 @deftypefn {Built-in Function} {} sprintf (@var{template}, @dots{})\n\ | |
1038 This is like @code{printf}, except that the output is returned as a\n\ | |
1039 string. Unlike the C library function, which requires you to provide a\n\ | |
1040 suitably sized string as an argument, Octave's @code{sprintf} function\n\ | |
1041 returns the string, automatically sized to hold all of the items\n\ | |
1042 converted.\n\ | |
5642 | 1043 @seealso{printf, fprintf, sscanf}\n\ |
1044 @end deftypefn") | |
1 | 1045 { |
4468 | 1046 static std::string who = "sprintf"; |
1047 | |
2095 | 1048 octave_value_list retval; |
1 | 1049 |
2095 | 1050 int nargin = args.length (); |
1 | 1051 |
2095 | 1052 if (nargin > 0) |
1 | 1053 { |
2116 | 1054 retval(2) = -1.0; |
1055 retval(1) = "unknown error"; | |
1056 retval(0) = ""; | |
1057 | |
3340 | 1058 octave_ostrstream *ostr = new octave_ostrstream (); |
1 | 1059 |
3340 | 1060 octave_stream os (ostr); |
628 | 1061 |
3340 | 1062 if (os.is_valid ()) |
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1063 { |
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1064 octave_value fmt_arg = args(0); |
6007 | 1065 |
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1066 if (fmt_arg.is_string ()) |
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1067 { |
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1068 octave_value_list tmp_args; |
1 | 1069 |
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1070 if (nargin > 1) |
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1071 { |
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1072 tmp_args.resize (nargin-1, octave_value ()); |
1 | 1073 |
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1074 for (int i = 1; i < nargin; i++) |
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1075 tmp_args(i-1) = args(i); |
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1076 } |
628 | 1077 |
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1078 retval(2) = os.printf (fmt_arg, tmp_args, who); |
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1079 retval(1) = os.error (); |
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1080 retval(0) = octave_value (ostr->str (), |
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1081 fmt_arg.is_sq_string () ? '\'' : '"'); |
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1082 } |
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1083 else |
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1084 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
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1085 } |
2095 | 1086 else |
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1087 ::error ("%s: unable to create output buffer", who.c_str ()); |
1 | 1088 } |
1089 else | |
5823 | 1090 print_usage (); |
1 | 1091 |
1092 return retval; | |
1093 } | |
1094 | |
2095 | 1095 DEFUN (fscanf, args, , |
3372 | 1096 "-*- texinfo -*-\n\ |
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1097 @deftypefn {Built-in Function} {[@var{val}, @var{count}, @var{errmsg}] =} fscanf (@var{fid}, @var{template}, @var{size})\n\ |
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1098 @deftypefnx {Built-in Function} {[@var{v1}, @var{v2}, @dots{}, @var{count}, @var{errmsg}] =} fscanf (@var{fid}, @var{template}, \"C\")\n\ |
3372 | 1099 In the first form, read from @var{fid} according to @var{template},\n\ |
1100 returning the result in the matrix @var{val}.\n\ | |
2122 | 1101 \n\ |
3372 | 1102 The optional argument @var{size} specifies the amount of data to read\n\ |
1103 and may be one of\n\ | |
1104 \n\ | |
1105 @table @code\n\ | |
1106 @item Inf\n\ | |
1107 Read as much as possible, returning a column vector.\n\ | |
1108 \n\ | |
1109 @item @var{nr}\n\ | |
1110 Read up to @var{nr} elements, returning a column vector.\n\ | |
2122 | 1111 \n\ |
3372 | 1112 @item [@var{nr}, Inf]\n\ |
1113 Read as much as possible, returning a matrix with @var{nr} rows. If the\n\ | |
1114 number of elements read is not an exact multiple of @var{nr}, the last\n\ | |
1115 column is padded with zeros.\n\ | |
1116 \n\ | |
1117 @item [@var{nr}, @var{nc}]\n\ | |
1118 Read up to @code{@var{nr} * @var{nc}} elements, returning a matrix with\n\ | |
1119 @var{nr} rows. If the number of elements read is not an exact multiple\n\ | |
1120 of @var{nr}, the last column is padded with zeros.\n\ | |
1121 @end table\n\ | |
2122 | 1122 \n\ |
3372 | 1123 @noindent\n\ |
1124 If @var{size} is omitted, a value of @code{Inf} is assumed.\n\ | |
2122 | 1125 \n\ |
3372 | 1126 A string is returned if @var{template} specifies only character\n\ |
1127 conversions.\n\ | |
2215 | 1128 \n\ |
3372 | 1129 The number of items successfully read is returned in @var{count}.\n\ |
2215 | 1130 \n\ |
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1131 If an error occurs, @var{errmsg} contains a system-dependent error message.\n\ |
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1132 \n\ |
3372 | 1133 In the second form, read from @var{fid} according to @var{template},\n\ |
1134 with each conversion specifier in @var{template} corresponding to a\n\ | |
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1135 single scalar return value. This form is more ``C-like'', and also\n\ |
3491 | 1136 compatible with previous versions of Octave. The number of successful\n\ |
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1137 conversions is returned in @var{count}\n\ |
5653 | 1138 @ifclear OCTAVE_MANUAL\n\ |
1139 \n\ | |
1140 See the Formatted Input section of the GNU Octave manual for a\n\ | |
1141 complete description of the syntax of the template string.\n\ | |
1142 @end ifclear\n\ | |
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1143 @seealso{fgets, fgetl, fread, scanf, sscanf, fopen}\n\ |
5642 | 1144 @end deftypefn") |
1181 | 1145 { |
4468 | 1146 static std::string who = "fscanf"; |
1147 | |
2095 | 1148 octave_value_list retval; |
1181 | 1149 |
1150 int nargin = args.length (); | |
1151 | |
2215 | 1152 if (nargin == 3 && args(2).is_string ()) |
2095 | 1153 { |
4468 | 1154 octave_stream os = octave_stream_list::lookup (args(0), who); |
1181 | 1155 |
3341 | 1156 if (! error_state) |
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1157 { |
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1158 if (args(1).is_string ()) |
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1159 retval = os.oscanf (args(1), who); |
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1160 else |
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1161 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
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1162 } |
2095 | 1163 } |
1181 | 1164 else |
2215 | 1165 { |
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1166 retval(2) = "unknown error"; |
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1167 retval(1) = 0.0; |
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1168 retval(0) = Matrix (); |
2215 | 1169 |
1170 if (nargin == 2 || nargin == 3) | |
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1171 { |
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1172 octave_stream os = octave_stream_list::lookup (args(0), who); |
2215 | 1173 |
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1174 if (! error_state) |
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1175 { |
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1176 if (args(1).is_string ()) |
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1177 { |
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1178 octave_idx_type count = 0; |
2215 | 1179 |
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1180 Array<double> size = (nargin == 3) |
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1181 ? args(2).vector_value () |
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1182 : Array<double> (dim_vector (1, 1), lo_ieee_inf_value ()); |
2215 | 1183 |
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1184 if (! error_state) |
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1185 { |
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1186 octave_value tmp = os.scanf (args(1), size, count, who); |
2215 | 1187 |
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1188 if (! error_state) |
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1189 { |
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1190 retval(2) = os.error (); |
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1191 retval(1) = count; |
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1192 retval(0) = tmp; |
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1193 } |
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1194 } |
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1195 } |
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1196 else |
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1197 ::error ("%s: format must be a string", who.c_str ()); |
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1198 } |
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1199 } |
2215 | 1200 else |
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1201 print_usage (); |
2215 | 1202 } |
1181 | 1203 |
1204 return retval; | |
1205 } | |
1206 | |
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1207 static std::string |
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1208 get_sscanf_data (const octave_value& val) |
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1209 { |
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1210 std::string retval; |
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1211 |
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1212 if (val.is_string ()) |
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1213 { |
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1214 octave_value tmp = val.reshape (dim_vector (1, val.numel ())); |
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1215 |
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1216 retval = tmp.string_value (); |
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1217 } |
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1218 else |
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1219 ::error ("sscanf: argument STRING must be a string"); |
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1220 |
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1221 return retval; |
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1222 } |
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1223 |
2095 | 1224 DEFUN (sscanf, args, , |
3372 | 1225 "-*- texinfo -*-\n\ |
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1226 @deftypefn {Built-in Function} {[@var{val}, @var{count}, @var{errmsg}, @var{pos}] =} sscanf (@var{string}, @var{template}, @var{size})\n\ |
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1227 @deftypefnx {Built-in Function} {[@var{v1}, @var{v2}, @dots{}, @var{count}, @var{errmsg}] =} sscanf (@var{string}, @var{template}, \"C\")\n\ |
3372 | 1228 This is like @code{fscanf}, except that the characters are taken from the\n\ |
1229 string @var{string} instead of from a stream. Reaching the end of the\n\ | |
12993
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1230 string is treated as an end-of-file condition. In addition to the values\n\ |
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1231 returned by @code{fscanf}, the index of the next character to be read\n\ |
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1232 is returned in @var{pos}.\n\ |
5642 | 1233 @seealso{fscanf, scanf, sprintf}\n\ |
1234 @end deftypefn") | |
444 | 1235 { |
4468 | 1236 static std::string who = "sscanf"; |
1237 | |
2095 | 1238 octave_value_list retval; |
444 | 1239 |
506 | 1240 int nargin = args.length (); |
1241 | |
2215 | 1242 if (nargin == 3 && args(2).is_string ()) |
2095 | 1243 { |
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1244 std::string data = get_sscanf_data (args(0)); |
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1245 |
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1246 if (! error_state) |
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1247 { |
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1248 octave_stream os = octave_istrstream::create (data); |
1358 | 1249 |
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1250 if (os.is_valid ()) |
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1251 { |
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1252 if (args(1).is_string ()) |
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1253 retval = os.oscanf (args(1), who); |
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1254 else |
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1255 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
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1256 } |
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1257 else |
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1258 ::error ("%s: unable to create temporary input buffer", |
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1259 who.c_str ()); |
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1260 } |
636 | 1261 else |
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1262 ::error ("%s: argument STRING must be a string", who.c_str ()); |
444 | 1263 } |
1264 else | |
2215 | 1265 { |
1266 if (nargin == 2 || nargin == 3) | |
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1267 { |
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1268 retval(3) = -1.0; |
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1269 retval(2) = "unknown error"; |
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1270 retval(1) = 0.0; |
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1271 retval(0) = Matrix (); |
2215 | 1272 |
13194
3e1871badab9
allow sscanf to accept character arrays with more than one row
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1273 std::string data = get_sscanf_data (args(0)); |
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1274 |
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1275 if (! error_state) |
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1276 { |
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1277 octave_stream os = octave_istrstream::create (data); |
2215 | 1278 |
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1279 if (os.is_valid ()) |
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1280 { |
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1281 if (args(1).is_string ()) |
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1282 { |
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1283 octave_idx_type count = 0; |
2215 | 1284 |
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1285 Array<double> size = (nargin == 3) |
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1286 ? args(2).vector_value () |
11570
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1287 : Array<double> (dim_vector (1, 1), |
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attempt better backward compatibility for Array constructors
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1288 lo_ieee_inf_value ()); |
2215 | 1289 |
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1290 octave_value tmp = os.scanf (args(1), size, count, who); |
2215 | 1291 |
10315
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1292 if (! error_state) |
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1293 { |
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1294 // FIXME -- is this the right thing to do? |
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1295 // Extract error message first, because getting |
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1296 // position will clear it. |
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1297 std::string errmsg = os.error (); |
2215 | 1298 |
12997
bac0858b92ee
sscanf: correctly set output position when reading stops at end of string
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1299 retval(3) |
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1300 = (os.eof () ? data.length () : os.tell ()) + 1; |
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1301 retval(2) = errmsg; |
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1302 retval(1) = count; |
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1303 retval(0) = tmp; |
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1304 } |
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1305 } |
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1306 else |
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Rik <octave@nomad.inbox5.com>
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|
1307 ::error ("%s: format TEMPLATE must be a string", who.c_str ()); |
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1308 } |
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1309 else |
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1310 ::error ("%s: unable to create temporary input buffer", |
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1311 who.c_str ()); |
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1312 } |
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1313 } |
2215 | 1314 else |
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1315 print_usage (); |
2215 | 1316 } |
444 | 1317 |
1318 return retval; | |
1319 } | |
1320 | |
2215 | 1321 DEFUN (scanf, args, nargout, |
3372 | 1322 "-*- texinfo -*-\n\ |
13271
fba2cc36b762
return stream error message in scanf functions and document behavior
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1323 @deftypefn {Built-in Function} {[@var{val}, @var{count}, @var{errmsg}] =} scanf (@var{template}, @var{size})\n\ |
16099
4b6c44096862
Backout changeset 238e499c5fea (locale support in scanf)
Rik <rik@octave.org>
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|
1324 @deftypefnx {Built-in Function} {[@var{v1}, @var{v2}, @dots{}, @var{count}, @var{errmsg}]] =} scanf (@var{template}, \"C\")\n\ |
3372 | 1325 This is equivalent to calling @code{fscanf} with @var{fid} = @code{stdin}.\n\ |
1326 \n\ | |
1327 It is currently not useful to call @code{scanf} in interactive\n\ | |
1328 programs.\n\ | |
5642 | 1329 @seealso{fscanf, sscanf, printf}\n\ |
1330 @end deftypefn") | |
2215 | 1331 { |
1332 int nargin = args.length (); | |
1333 | |
1334 octave_value_list tmp_args (nargin+1, octave_value ()); | |
1335 | |
1336 tmp_args (0) = 0.0; | |
1337 for (int i = 0; i < nargin; i++) | |
1338 tmp_args (i+1) = args (i); | |
1339 | |
1340 return Ffscanf (tmp_args, nargout); | |
1341 } | |
1342 | |
2116 | 1343 static octave_value |
1344 do_fread (octave_stream& os, const octave_value& size_arg, | |
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1345 const octave_value& prec_arg, const octave_value& skip_arg, |
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1346 const octave_value& arch_arg, octave_idx_type& count) |
2116 | 1347 { |
1348 octave_value retval; | |
1349 | |
1350 count = -1; | |
1351 | |
3810 | 1352 Array<double> size = size_arg.vector_value (); |
2116 | 1353 |
1354 if (! error_state) | |
1355 { | |
3523 | 1356 std::string prec = prec_arg.string_value (); |
2116 | 1357 |
1358 if (! error_state) | |
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1359 { |
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1360 int block_size = 1; |
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1361 oct_data_conv::data_type input_type; |
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1362 oct_data_conv::data_type output_type; |
4944 | 1363 |
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1364 oct_data_conv::string_to_data_type (prec, block_size, |
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1365 input_type, output_type); |
2116 | 1366 |
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1367 if (! error_state) |
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|
1368 { |
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1369 int skip = skip_arg.int_value (true); |
2116 | 1370 |
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1371 if (! error_state) |
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|
1372 { |
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1373 std::string arch = arch_arg.string_value (); |
3202 | 1374 |
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1375 if (! error_state) |
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|
1376 { |
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|
1377 oct_mach_info::float_format flt_fmt |
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|
1378 = oct_mach_info::string_to_float_format (arch); |
2116 | 1379 |
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1380 if (! error_state) |
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|
1381 retval = os.read (size, block_size, input_type, |
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|
1382 output_type, skip, flt_fmt, count); |
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1383 } |
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1384 else |
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Rik <octave@nomad.inbox5.com>
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|
1385 ::error ("fread: ARCH architecture type must be a string"); |
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|
1386 } |
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1387 else |
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Rewrite error strings in src/ to use variables named in documentation.
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|
1388 ::error ("fread: SKIP must be an integer"); |
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|
1389 } |
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|
1390 else |
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|
1391 ::error ("fread: invalid PRECISION specified"); |
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1392 } |
2116 | 1393 else |
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|
1394 ::error ("fread: PRECISION must be a string"); |
2116 | 1395 } |
1396 else | |
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Rewrite error strings in src/ to use variables named in documentation.
Rik <octave@nomad.inbox5.com>
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|
1397 ::error ("fread: invalid SIZE specified"); |
2116 | 1398 |
1399 return retval; | |
1400 } | |
1401 | |
1402 DEFUN (fread, args, , | |
3372 | 1403 "-*- texinfo -*-\n\ |
1404 @deftypefn {Built-in Function} {[@var{val}, @var{count}] =} fread (@var{fid}, @var{size}, @var{precision}, @var{skip}, @var{arch})\n\ | |
1405 Read binary data of type @var{precision} from the specified file ID\n\ | |
1406 @var{fid}.\n\ | |
1407 \n\ | |
1408 The optional argument @var{size} specifies the amount of data to read\n\ | |
1409 and may be one of\n\ | |
1410 \n\ | |
1411 @table @code\n\ | |
1412 @item Inf\n\ | |
1413 Read as much as possible, returning a column vector.\n\ | |
529 | 1414 \n\ |
3372 | 1415 @item @var{nr}\n\ |
1416 Read up to @var{nr} elements, returning a column vector.\n\ | |
1417 \n\ | |
1418 @item [@var{nr}, Inf]\n\ | |
1419 Read as much as possible, returning a matrix with @var{nr} rows. If the\n\ | |
1420 number of elements read is not an exact multiple of @var{nr}, the last\n\ | |
1421 column is padded with zeros.\n\ | |
1422 \n\ | |
1423 @item [@var{nr}, @var{nc}]\n\ | |
1424 Read up to @code{@var{nr} * @var{nc}} elements, returning a matrix with\n\ | |
1425 @var{nr} rows. If the number of elements read is not an exact multiple\n\ | |
1426 of @var{nr}, the last column is padded with zeros.\n\ | |
1427 @end table\n\ | |
1428 \n\ | |
1429 @noindent\n\ | |
1430 If @var{size} is omitted, a value of @code{Inf} is assumed.\n\ | |
2318 | 1431 \n\ |
3372 | 1432 The optional argument @var{precision} is a string specifying the type of\n\ |
1433 data to read and may be one of\n\ | |
1434 \n\ | |
11595
5ec6aa05638d
Prevent doubled quotes around @table items in Info.
Rik <octave@nomad.inbox5.com>
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diff
changeset
|
1435 @table @asis\n\ |
17281
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|
1436 @item @qcode{\"schar\"}\n\ |
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|
1437 @itemx @qcode{\"signed char\"}\n\ |
3372 | 1438 Signed character.\n\ |
529 | 1439 \n\ |
17281
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|
1440 @item @qcode{\"uchar\"}\n\ |
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changeset
|
1441 @itemx @qcode{\"unsigned char\"}\n\ |
3372 | 1442 Unsigned character.\n\ |
1443 \n\ | |
17281
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changeset
|
1444 @item @qcode{\"int8\"}\n\ |
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changeset
|
1445 @itemx @qcode{\"integer*1\"}\n\ |
4944 | 1446 \n\ |
1447 8-bit signed integer.\n\ | |
2318 | 1448 \n\ |
17281
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changeset
|
1449 @item @qcode{\"int16\"}\n\ |
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changeset
|
1450 @itemx @qcode{\"integer*2\"}\n\ |
4944 | 1451 16-bit signed integer.\n\ |
3372 | 1452 \n\ |
17281
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diff
changeset
|
1453 @item @qcode{\"int32\"}\n\ |
bc924baa2c4e
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1454 @itemx @qcode{\"integer*4\"}\n\ |
4944 | 1455 32-bit signed integer.\n\ |
3372 | 1456 \n\ |
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1457 @item @qcode{\"int64\"}\n\ |
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1458 @itemx @qcode{\"integer*8\"}\n\ |
4944 | 1459 64-bit signed integer.\n\ |
1460 \n\ | |
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1461 @item @qcode{\"uint8\"}\n\ |
4944 | 1462 8-bit unsigned integer.\n\ |
529 | 1463 \n\ |
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1464 @item @qcode{\"uint16\"}\n\ |
4944 | 1465 16-bit unsigned integer.\n\ |
3372 | 1466 \n\ |
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1467 @item @qcode{\"uint32\"}\n\ |
4944 | 1468 32-bit unsigned integer.\n\ |
3372 | 1469 \n\ |
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1470 @item @qcode{\"uint64\"}\n\ |
4944 | 1471 64-bit unsigned integer.\n\ |
1472 \n\ | |
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1473 @item @qcode{\"single\"}\n\ |
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1474 @itemx @qcode{\"float32\"}\n\ |
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1475 @itemx @qcode{\"real*4\"}\n\ |
4944 | 1476 32-bit floating point number.\n\ |
3372 | 1477 \n\ |
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1478 @item @qcode{\"double\"}\n\ |
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1479 @itemx @qcode{\"float64\"}\n\ |
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1480 @itemx @qcode{\"real*8\"}\n\ |
4944 | 1481 64-bit floating point number.\n\ |
1482 \n\ | |
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1483 @item @qcode{\"char\"}\n\ |
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1484 @itemx @qcode{\"char*1\"}\n\ |
4944 | 1485 Single character.\n\ |
3372 | 1486 \n\ |
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1487 @item @qcode{\"short\"}\n\ |
4944 | 1488 Short integer (size is platform dependent).\n\ |
1489 \n\ | |
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1490 @item @qcode{\"int\"}\n\ |
4944 | 1491 Integer (size is platform dependent).\n\ |
1492 \n\ | |
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1493 @item @qcode{\"long\"}\n\ |
4944 | 1494 Long integer (size is platform dependent).\n\ |
3372 | 1495 \n\ |
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1496 @item @qcode{\"ushort\"}\n\ |
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1497 @itemx @qcode{\"unsigned short\"}\n\ |
4944 | 1498 Unsigned short integer (size is platform dependent).\n\ |
4610 | 1499 \n\ |
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1500 @item @qcode{\"uint\"}\n\ |
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1501 @itemx @qcode{\"unsigned int\"}\n\ |
4944 | 1502 Unsigned integer (size is platform dependent).\n\ |
4610 | 1503 \n\ |
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1504 @item @qcode{\"ulong\"}\n\ |
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1505 @itemx @qcode{\"unsigned long\"}\n\ |
4944 | 1506 Unsigned long integer (size is platform dependent).\n\ |
1507 \n\ | |
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1508 @item @qcode{\"float\"}\n\ |
4944 | 1509 Single precision floating point number (size is platform dependent).\n\ |
3372 | 1510 @end table\n\ |
1511 \n\ | |
1512 @noindent\n\ | |
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1513 The default precision is @qcode{\"uchar\"}.\n\ |
2318 | 1514 \n\ |
4944 | 1515 The @var{precision} argument may also specify an optional repeat\n\ |
1516 count. For example, @samp{32*single} causes @code{fread} to read\n\ | |
1517 a block of 32 single precision floating point numbers. Reading in\n\ | |
1518 blocks is useful in combination with the @var{skip} argument.\n\ | |
1519 \n\ | |
1520 The @var{precision} argument may also specify a type conversion.\n\ | |
1521 For example, @samp{int16=>int32} causes @code{fread} to read 16-bit\n\ | |
1522 integer values and return an array of 32-bit integer values. By\n\ | |
1523 default, @code{fread} returns a double precision array. The special\n\ | |
1524 form @samp{*TYPE} is shorthand for @samp{TYPE=>TYPE}.\n\ | |
1525 \n\ | |
7096 | 1526 The conversion and repeat counts may be combined. For example, the\n\ |
1527 specification @samp{32*single=>single} causes @code{fread} to read\n\ | |
1528 blocks of single precision floating point values and return an array\n\ | |
1529 of single precision values instead of the default array of double\n\ | |
1530 precision values.\n\ | |
4944 | 1531 \n\ |
3372 | 1532 The optional argument @var{skip} specifies the number of bytes to skip\n\ |
4944 | 1533 after each element (or block of elements) is read. If it is not\n\ |
1534 specified, a value of 0 is assumed. If the final block read is not\n\ | |
1535 complete, the final skip is omitted. For example,\n\ | |
1536 \n\ | |
1537 @example\n\ | |
1538 fread (f, 10, \"3*single=>single\", 8)\n\ | |
1539 @end example\n\ | |
1540 \n\ | |
1541 @noindent\n\ | |
1542 will omit the final 8-byte skip because the last read will not be\n\ | |
1543 a complete block of 3 values.\n\ | |
3372 | 1544 \n\ |
1545 The optional argument @var{arch} is a string specifying the data format\n\ | |
1546 for the file. Valid values are\n\ | |
529 | 1547 \n\ |
3372 | 1548 @table @code\n\ |
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1549 @item @qcode{\"native\"}\n\ |
3372 | 1550 The format of the current machine.\n\ |
1551 \n\ | |
4546 | 1552 @item \"ieee-be\"\n\ |
3372 | 1553 IEEE big endian.\n\ |
1554 \n\ | |
4546 | 1555 @item \"ieee-le\"\n\ |
3372 | 1556 IEEE little endian.\n\ |
1557 @end table\n\ | |
2318 | 1558 \n\ |
3372 | 1559 The data read from the file is returned in @var{val}, and the number of\n\ |
1560 values read is returned in @code{count}\n\ | |
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1561 @seealso{fwrite, fgets, fgetl, fscanf, fopen}\n\ |
5642 | 1562 @end deftypefn") |
529 | 1563 { |
2095 | 1564 octave_value_list retval; |
2116 | 1565 |
1566 int nargin = args.length (); | |
1567 | |
2318 | 1568 if (nargin > 0 && nargin < 6) |
2116 | 1569 { |
1570 retval(1) = -1.0; | |
1571 retval(0) = Matrix (); | |
1572 | |
3341 | 1573 octave_stream os = octave_stream_list::lookup (args(0), "fread"); |
2116 | 1574 |
3341 | 1575 if (! error_state) |
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1576 { |
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1577 octave_value size = lo_ieee_inf_value (); |
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1578 octave_value prec = "uchar"; |
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1579 octave_value skip = 0; |
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1580 octave_value arch = "unknown"; |
2116 | 1581 |
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1582 int idx = 1; |
2116 | 1583 |
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1584 if (nargin > idx && ! args(idx).is_string ()) |
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1585 size = args(idx++); |
4257 | 1586 |
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1587 if (nargin > idx) |
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1588 prec = args(idx++); |
2116 | 1589 |
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1590 if (nargin > idx) |
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1591 skip = args(idx++); |
4257 | 1592 |
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1593 if (nargin > idx) |
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1594 arch = args(idx++); |
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1595 else if (skip.is_string ()) |
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1596 { |
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1597 arch = skip; |
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1598 skip = 0; |
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1599 } |
2116 | 1600 |
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1601 octave_idx_type count = -1; |
2116 | 1602 |
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1603 octave_value tmp = do_fread (os, size, prec, skip, arch, count); |
2116 | 1604 |
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1605 retval(1) = count; |
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1606 retval(0) = tmp; |
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1607 } |
2116 | 1608 } |
1609 else | |
5823 | 1610 print_usage (); |
2116 | 1611 |
529 | 1612 return retval; |
1613 } | |
1614 | |
2116 | 1615 static int |
1616 do_fwrite (octave_stream& os, const octave_value& data, | |
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1617 const octave_value& prec_arg, const octave_value& skip_arg, |
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1618 const octave_value& arch_arg) |
2116 | 1619 { |
1620 int retval = -1; | |
1621 | |
3523 | 1622 std::string prec = prec_arg.string_value (); |
2116 | 1623 |
1624 if (! error_state) | |
1625 { | |
4944 | 1626 int block_size = 1; |
1627 oct_data_conv::data_type output_type; | |
1628 | |
1629 oct_data_conv::string_to_data_type (prec, block_size, output_type); | |
2116 | 1630 |
1631 if (! error_state) | |
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1632 { |
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1633 int skip = skip_arg.int_value (true); |
2116 | 1634 |
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1635 if (! error_state) |
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1636 { |
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1637 std::string arch = arch_arg.string_value (); |
3202 | 1638 |
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1639 if (! error_state) |
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1640 { |
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1641 oct_mach_info::float_format flt_fmt |
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1642 = oct_mach_info::string_to_float_format (arch); |
2116 | 1643 |
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1644 if (! error_state) |
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1645 retval = os.write (data, block_size, output_type, |
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1646 skip, flt_fmt); |
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1647 } |
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1648 else |
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1649 ::error ("fwrite: ARCH architecture type must be a string"); |
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1650 } |
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1651 else |
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1652 ::error ("fwrite: SKIP must be an integer"); |
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1653 } |
3202 | 1654 else |
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1655 ::error ("fwrite: invalid PRECISION specified"); |
2116 | 1656 } |
1657 else | |
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1658 ::error ("fwrite: PRECISION must be a string"); |
2116 | 1659 |
1660 return retval; | |
1661 } | |
1662 | |
1663 DEFUN (fwrite, args, , | |
3372 | 1664 "-*- texinfo -*-\n\ |
1665 @deftypefn {Built-in Function} {@var{count} =} fwrite (@var{fid}, @var{data}, @var{precision}, @var{skip}, @var{arch})\n\ | |
1666 Write data in binary form of type @var{precision} to the specified file\n\ | |
1667 ID @var{fid}, returning the number of values successfully written to the\n\ | |
1668 file.\n\ | |
1181 | 1669 \n\ |
3372 | 1670 The argument @var{data} is a matrix of values that are to be written to\n\ |
1671 the file. The values are extracted in column-major order.\n\ | |
1181 | 1672 \n\ |
3372 | 1673 The remaining arguments @var{precision}, @var{skip}, and @var{arch} are\n\ |
1674 optional, and are interpreted as described for @code{fread}.\n\ | |
1181 | 1675 \n\ |
3372 | 1676 The behavior of @code{fwrite} is undefined if the values in @var{data}\n\ |
1677 are too large to fit in the specified precision.\n\ | |
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1678 @seealso{fread, fputs, fprintf, fopen}\n\ |
5642 | 1679 @end deftypefn") |
1181 | 1680 { |
4233 | 1681 octave_value retval = -1; |
2116 | 1682 |
1683 int nargin = args.length (); | |
1684 | |
1685 if (nargin > 1 && nargin < 6) | |
1686 { | |
3341 | 1687 octave_stream os = octave_stream_list::lookup (args(0), "fwrite"); |
2116 | 1688 |
3341 | 1689 if (! error_state) |
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1690 { |
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1691 octave_value prec = "uchar"; |
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1692 octave_value skip = 0; |
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1693 octave_value arch = "unknown"; |
2318 | 1694 |
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1695 int idx = 1; |
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1696 |
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1697 octave_value data = args(idx++); |
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1698 |
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1699 if (nargin > idx) |
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1700 prec = args(idx++); |
2318 | 1701 |
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1702 if (nargin > idx) |
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1703 skip = args(idx++); |
2318 | 1704 |
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1705 if (nargin > idx) |
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1706 arch = args(idx++); |
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1707 else if (skip.is_string ()) |
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1708 { |
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1709 arch = skip; |
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1710 skip = 0; |
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1711 } |
2116 | 1712 |
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1713 double status = do_fwrite (os, data, prec, skip, arch); |
2825 | 1714 |
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1715 retval = status; |
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1716 } |
2116 | 1717 } |
1718 else | |
5823 | 1719 print_usage (); |
2116 | 1720 |
1181 | 1721 return retval; |
1722 } | |
1723 | |
5906 | 1724 DEFUNX ("feof", Ffeof, args, , |
3372 | 1725 "-*- texinfo -*-\n\ |
1726 @deftypefn {Built-in Function} {} feof (@var{fid})\n\ | |
1727 Return 1 if an end-of-file condition has been encountered for a given\n\ | |
1728 file and 0 otherwise. Note that it will only return 1 if the end of the\n\ | |
1729 file has already been encountered, not if the next read operation will\n\ | |
1730 result in an end-of-file condition.\n\ | |
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1731 @seealso{fread, fopen}\n\ |
5642 | 1732 @end deftypefn") |
529 | 1733 { |
4233 | 1734 octave_value retval = -1; |
529 | 1735 |
1736 int nargin = args.length (); | |
1737 | |
2095 | 1738 if (nargin == 1) |
1739 { | |
3341 | 1740 octave_stream os = octave_stream_list::lookup (args(0), "feof"); |
444 | 1741 |
3341 | 1742 if (! error_state) |
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1743 retval = os.eof () ? 1.0 : 0.0; |
2095 | 1744 } |
529 | 1745 else |
5823 | 1746 print_usage (); |
444 | 1747 |
1748 return retval; | |
1749 } | |
1750 | |
5906 | 1751 DEFUNX ("ferror", Fferror, args, , |
3372 | 1752 "-*- texinfo -*-\n\ |
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1753 @deftypefn {Built-in Function} {[@var{err}, @var{msg}] =} ferror (@var{fid})\n\ |
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1754 @deftypefnx {Built-in Function} {[@var{err}, @var{msg}] =} ferror (@var{fid}, \"clear\")\n\ |
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1755 Return 1 if an error condition has been encountered for the file ID\n\ |
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1756 @var{fid} and 0 otherwise. Note that it will only return 1 if an error\n\ |
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1757 has already been encountered, not if the next operation will result in\n\ |
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1758 an error condition.\n\ |
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1759 \n\ |
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1760 The second argument is optional. If it is supplied, also clear the\n\ |
3372 | 1761 error condition.\n\ |
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1762 @seealso{fclear, fopen}\n\ |
3372 | 1763 @end deftypefn") |
1230 | 1764 { |
2095 | 1765 octave_value_list retval; |
1230 | 1766 |
2095 | 1767 int nargin = args.length (); |
1230 | 1768 |
2095 | 1769 if (nargin == 1 || nargin == 2) |
1770 { | |
3341 | 1771 octave_stream os = octave_stream_list::lookup (args(0), "ferror"); |
1230 | 1772 |
3341 | 1773 if (! error_state) |
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1774 { |
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1775 bool clear = false; |
1230 | 1776 |
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1777 if (nargin == 2) |
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1778 { |
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1779 std::string opt = args(1).string_value (); |
2095 | 1780 |
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1781 if (! error_state) |
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1782 clear = (opt == "clear"); |
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1783 else |
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1784 return retval; |
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1785 } |
1755 | 1786 |
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1787 int error_number = 0; |
2095 | 1788 |
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1789 std::string error_message = os.error (clear, error_number); |
1230 | 1790 |
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1791 retval(1) = error_number; |
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1792 retval(0) = error_message; |
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1793 } |
1230 | 1794 } |
2095 | 1795 else |
5823 | 1796 print_usage (); |
1230 | 1797 |
1798 return retval; | |
1799 } | |
1800 | |
1957 | 1801 DEFUN (popen, args, , |
3301 | 1802 "-*- texinfo -*-\n\ |
4326 | 1803 @deftypefn {Built-in Function} {@var{fid} =} popen (@var{command}, @var{mode})\n\ |
3301 | 1804 Start a process and create a pipe. The name of the command to run is\n\ |
1805 given by @var{command}. The file identifier corresponding to the input\n\ | |
1806 or output stream of the process is returned in @var{fid}. The argument\n\ | |
1807 @var{mode} may be\n\ | |
1808 \n\ | |
1809 @table @code\n\ | |
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1810 @item @qcode{\"r\"}\n\ |
3301 | 1811 The pipe will be connected to the standard output of the process, and\n\ |
1812 open for reading.\n\ | |
1230 | 1813 \n\ |
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1814 @item @qcode{\"w\"}\n\ |
3301 | 1815 The pipe will be connected to the standard input of the process, and\n\ |
1816 open for writing.\n\ | |
1817 @end table\n\ | |
1818 \n\ | |
10840 | 1819 For example:\n\ |
1230 | 1820 \n\ |
3301 | 1821 @example\n\ |
1822 @group\n\ | |
1823 fid = popen (\"ls -ltr / | tail -3\", \"r\");\n\ | |
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1824 while (ischar (s = fgets (fid)))\n\ |
3301 | 1825 fputs (stdout, s);\n\ |
1826 endwhile\n\ | |
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1827 \n\ |
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1828 @print{} drwxr-xr-x 33 root root 3072 Feb 15 13:28 etc\n\ |
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1829 @print{} drwxr-xr-x 3 root root 1024 Feb 15 13:28 lib\n\ |
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1830 @print{} drwxrwxrwt 15 root root 2048 Feb 17 14:53 tmp\n\ |
3301 | 1831 @end group\n\ |
1832 @end example\n\ | |
1833 @end deftypefn") | |
1230 | 1834 { |
4233 | 1835 octave_value retval = -1; |
1230 | 1836 |
1837 int nargin = args.length (); | |
1838 | |
2095 | 1839 if (nargin == 2) |
1840 { | |
3523 | 1841 std::string name = args(0).string_value (); |
1230 | 1842 |
2095 | 1843 if (! error_state) |
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1844 { |
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1845 std::string mode = args(1).string_value (); |
1230 | 1846 |
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1847 if (! error_state) |
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1848 { |
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1849 if (mode == "r") |
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1850 { |
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1851 octave_stream ips = octave_iprocstream::create (name); |
1230 | 1852 |
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1853 retval = octave_stream_list::insert (ips); |
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1854 } |
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1855 else if (mode == "w") |
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1856 { |
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1857 octave_stream ops = octave_oprocstream::create (name); |
1230 | 1858 |
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1859 retval = octave_stream_list::insert (ops); |
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1860 } |
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1861 else |
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1862 ::error ("popen: invalid MODE specified"); |
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1863 } |
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1864 else |
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1865 ::error ("popen: MODE must be a string"); |
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1866 } |
2095 | 1867 else |
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1868 ::error ("popen: COMMAND must be a string"); |
2095 | 1869 } |
1230 | 1870 else |
5823 | 1871 print_usage (); |
1230 | 1872 |
1873 return retval; | |
1874 } | |
1875 | |
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1876 DEFUNX ("pclose", Fpclose, args, , |
3381 | 1877 "-*- texinfo -*-\n\ |
3301 | 1878 @deftypefn {Built-in Function} {} pclose (@var{fid})\n\ |
1879 Close a file identifier that was opened by @code{popen}. You may also\n\ | |
1880 use @code{fclose} for the same purpose.\n\ | |
1881 @end deftypefn") | |
1230 | 1882 { |
4233 | 1883 octave_value retval = -1; |
1230 | 1884 |
1885 int nargin = args.length (); | |
1886 | |
2095 | 1887 if (nargin == 1) |
4233 | 1888 retval = octave_stream_list::remove (args(0), "pclose"); |
1377 | 1889 else |
5823 | 1890 print_usage (); |
1379 | 1891 |
1892 return retval; | |
1893 } | |
1894 | |
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1895 DEFUNX ("tmpnam", Ftmpnam, args, , |
3372 | 1896 "-*- texinfo -*-\n\ |
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1897 @c List other forms of function in documentation index\n\ |
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1898 @findex octave_tmp_file_name\n\ |
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1899 \n\ |
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1900 @deftypefn {Built-in Function} {} tmpnam ()\n\ |
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1901 @deftypefnx {Built-in Function} {} tmpnam (@var{dir})\n\ |
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1902 @deftypefnx {Built-in Function} {} tmpnam (@var{dir}, @var{prefix})\n\ |
3372 | 1903 Return a unique temporary file name as a string.\n\ |
1904 \n\ | |
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1905 If @var{prefix} is omitted, a value of @qcode{\"oct-\"} is used.\n\ |
4267 | 1906 If @var{dir} is also omitted, the default directory for temporary files\n\ |
1907 is used. If @var{dir} is provided, it must exist, otherwise the default\n\ | |
1908 directory for temporary files is used. Since the named file is not\n\ | |
1909 opened, by @code{tmpnam}, it is possible (though relatively unlikely)\n\ | |
1910 that it will not be available by the time your program attempts to open it.\n\ | |
5642 | 1911 @seealso{tmpfile, mkstemp, P_tmpdir}\n\ |
1912 @end deftypefn") | |
1802 | 1913 { |
2095 | 1914 octave_value retval; |
1802 | 1915 |
2936 | 1916 int len = args.length (); |
1917 | |
1918 if (len < 3) | |
1919 { | |
3523 | 1920 std::string dir = len > 0 ? args(0).string_value () : std::string (); |
2936 | 1921 |
1922 if (! error_state) | |
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1923 { |
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1924 std::string pfx |
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1925 = len > 1 ? args(1).string_value () : std::string ("oct-"); |
4267 | 1926 |
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1927 if (! error_state) |
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1928 retval = octave_tempnam (dir, pfx); |
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1929 else |
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1930 ::error ("PREFIX must be a string"); |
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1931 } |
4267 | 1932 else |
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1933 ::error ("DIR argument must be a string"); |
2936 | 1934 } |
1802 | 1935 else |
5823 | 1936 print_usage (); |
1802 | 1937 |
1938 return retval; | |
1939 } | |
1940 | |
2458 | 1941 DEFALIAS (octave_tmp_file_name, tmpnam); |
1942 | |
4326 | 1943 DEFUN (tmpfile, args, , |
1944 "-*- texinfo -*-\n\ | |
1945 @deftypefn {Built-in Function} {[@var{fid}, @var{msg}] =} tmpfile ()\n\ | |
1946 Return the file ID corresponding to a new temporary file with a unique\n\ | |
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1947 name. The file is opened in binary read/write (@qcode{\"w+b\"}) mode.\n\ |
4326 | 1948 The file will be deleted automatically when it is closed or when Octave\n\ |
1949 exits.\n\ | |
1950 \n\ | |
1951 If successful, @var{fid} is a valid file ID and @var{msg} is an empty\n\ | |
1952 string. Otherwise, @var{fid} is -1 and @var{msg} contains a\n\ | |
1953 system-dependent error message.\n\ | |
5642 | 1954 @seealso{tmpnam, mkstemp, P_tmpdir}\n\ |
1955 @end deftypefn") | |
4326 | 1956 { |
1957 octave_value_list retval; | |
1958 | |
1959 retval(1) = std::string (); | |
1960 retval(0) = -1; | |
1961 | |
1962 int nargin = args.length (); | |
1963 | |
1964 if (nargin == 0) | |
1965 { | |
12775 | 1966 FILE *fid = gnulib::tmpfile (); |
4326 | 1967 |
1968 if (fid) | |
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1969 { |
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1970 std::string nm; |
4326 | 1971 |
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1972 std::ios::openmode md = fopen_mode_to_ios_mode ("w+b"); |
4326 | 1973 |
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1974 octave_stream s = octave_stdiostream::create (nm, fid, md); |
4326 | 1975 |
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1976 if (s) |
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1977 retval(0) = octave_stream_list::insert (s); |
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1978 else |
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1979 error ("tmpfile: failed to create octave_stdiostream object"); |
4326 | 1980 |
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1981 } |
4326 | 1982 else |
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1983 { |
10411 | 1984 retval(1) = gnulib::strerror (errno); |
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1985 retval(0) = -1; |
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1986 } |
4326 | 1987 } |
1988 else | |
5823 | 1989 print_usage (); |
4326 | 1990 |
1991 return retval; | |
1992 } | |
1993 | |
1994 DEFUN (mkstemp, args, , | |
1995 "-*- texinfo -*-\n\ | |
5109 | 1996 @deftypefn {Built-in Function} {[@var{fid}, @var{name}, @var{msg}] =} mkstemp (@var{template}, @var{delete})\n\ |
4326 | 1997 Return the file ID corresponding to a new temporary file with a unique\n\ |
1998 name created from @var{template}. The last six characters of @var{template}\n\ | |
5016 | 1999 must be @code{XXXXXX} and these are replaced with a string that makes the\n\ |
4326 | 2000 filename unique. The file is then created with mode read/write and\n\ |
2001 permissions that are system dependent (on GNU/Linux systems, the permissions\n\ | |
2002 will be 0600 for versions of glibc 2.0.7 and later). The file is opened\n\ | |
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2003 in binary mode and with the @w{@code{O_EXCL}} flag.\n\ |
4326 | 2004 \n\ |
2005 If the optional argument @var{delete} is supplied and is true,\n\ | |
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2006 the file will be deleted automatically when Octave exits.\n\ |
4326 | 2007 \n\ |
2008 If successful, @var{fid} is a valid file ID, @var{name} is the name of\n\ | |
7001 | 2009 the file, and @var{msg} is an empty string. Otherwise, @var{fid}\n\ |
4326 | 2010 is -1, @var{name} is empty, and @var{msg} contains a system-dependent\n\ |
2011 error message.\n\ | |
5642 | 2012 @seealso{tmpfile, tmpnam, P_tmpdir}\n\ |
2013 @end deftypefn") | |
4326 | 2014 { |
2015 octave_value_list retval; | |
2016 | |
2017 retval(2) = std::string (); | |
2018 retval(1) = std::string (); | |
2019 retval(0) = -1; | |
2020 | |
2021 int nargin = args.length (); | |
2022 | |
2023 if (nargin == 1 || nargin == 2) | |
2024 { | |
2025 std::string tmpl8 = args(0).string_value (); | |
2026 | |
2027 if (! error_state) | |
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2028 { |
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2029 OCTAVE_LOCAL_BUFFER (char, tmp, tmpl8.size () + 1); |
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2030 strcpy (tmp, tmpl8.c_str ()); |
4326 | 2031 |
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2032 int fd = gnulib::mkostemp (tmp, O_BINARY); |
4326 | 2033 |
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2034 if (fd < 0) |
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2035 { |
10411 | 2036 retval(2) = gnulib::strerror (errno); |
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2037 retval(0) = fd; |
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2038 } |
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2039 else |
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2040 { |
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2041 const char *fopen_mode = "w+b"; |
4326 | 2042 |
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2043 FILE *fid = fdopen (fd, fopen_mode); |
4326 | 2044 |
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2045 if (fid) |
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2046 { |
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2047 std::string nm = tmp; |
4326 | 2048 |
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2049 std::ios::openmode md = fopen_mode_to_ios_mode (fopen_mode); |
4326 | 2050 |
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2051 octave_stream s = octave_stdiostream::create (nm, fid, md); |
4326 | 2052 |
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2053 if (s) |
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2054 { |
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2055 retval(1) = nm; |
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2056 retval(0) = octave_stream_list::insert (s); |
4326 | 2057 |
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2058 if (nargin == 2 && args(1).is_true ()) |
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2059 mark_for_deletion (nm); |
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2060 } |
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2061 else |
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2062 error ("mkstemp: failed to create octave_stdiostream object"); |
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2063 } |
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2064 else |
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2065 { |
10411 | 2066 retval(2) = gnulib::strerror (errno); |
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2067 retval(0) = -1; |
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2068 } |
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2069 } |
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2070 } |
4326 | 2071 else |
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2072 error ("mkstemp: TEMPLATE argument must be a string"); |
4326 | 2073 } |
2074 else | |
5823 | 2075 print_usage (); |
4326 | 2076 |
2077 return retval; | |
2078 } | |
2079 | |
1400 | 2080 static int |
2081 convert (int x, int ibase, int obase) | |
2082 { | |
2083 int retval = 0; | |
2084 | |
2085 int tmp = x % obase; | |
2086 | |
2087 if (tmp > ibase - 1) | |
2095 | 2088 ::error ("umask: invalid digit"); |
1400 | 2089 else |
2090 { | |
2091 retval = tmp; | |
2092 int mult = ibase; | |
2093 while ((x = (x - tmp) / obase)) | |
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2094 { |
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2095 tmp = x % obase; |
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2096 if (tmp > ibase - 1) |
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2097 { |
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2098 ::error ("umask: invalid digit"); |
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2099 break; |
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2100 } |
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2101 retval += mult * tmp; |
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2102 mult *= ibase; |
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2103 } |
1400 | 2104 } |
2105 | |
2106 return retval; | |
2107 } | |
2108 | |
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attempt to avoid trouble with gnulib #defines in a consistent way
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|
2109 DEFUNX ("umask", Fumask, args, , |
3301 | 2110 "-*- texinfo -*-\n\ |
2111 @deftypefn {Built-in Function} {} umask (@var{mask})\n\ | |
2112 Set the permission mask for file creation. The parameter @var{mask}\n\ | |
4715 | 2113 is an integer, interpreted as an octal number. If successful,\n\ |
2114 returns the previous value of the mask (as an integer to be\n\ | |
2115 interpreted as an octal number); otherwise an error message is printed.\n\ | |
3301 | 2116 @end deftypefn") |
1400 | 2117 { |
2095 | 2118 octave_value_list retval; |
1400 | 2119 |
2120 int status = 0; | |
2121 | |
2122 if (args.length () == 1) | |
2123 { | |
3202 | 2124 int mask = args(0).int_value (true); |
1400 | 2125 |
3202 | 2126 if (! error_state) |
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2127 { |
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2128 if (mask < 0) |
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2129 { |
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2130 status = -1; |
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2131 ::error ("umask: MASK must be a positive integer value"); |
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2132 } |
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2133 else |
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2134 { |
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2135 int oct_mask = convert (mask, 8, 10); |
1400 | 2136 |
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2137 if (! error_state) |
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2138 status = convert (octave_umask (oct_mask), 10, 8); |
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2139 } |
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2140 } |
3202 | 2141 else |
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2142 { |
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2143 status = -1; |
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2144 ::error ("umask: MASK must be an integer"); |
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2145 } |
1400 | 2146 } |
2147 else | |
5823 | 2148 print_usage (); |
1400 | 2149 |
2150 if (status >= 0) | |
4233 | 2151 retval(0) = status; |
1400 | 2152 |
2153 return retval; | |
2154 } | |
2155 | |
5749 | 2156 static octave_value |
6483 | 2157 const_value (const char *, const octave_value_list& args, int val) |
2189 | 2158 { |
5749 | 2159 octave_value retval; |
2160 | |
2161 int nargin = args.length (); | |
2162 | |
2163 if (nargin == 0) | |
2164 retval = val; | |
2165 else | |
5823 | 2166 print_usage (); |
5749 | 2167 |
2168 return retval; | |
2169 } | |
2170 | |
2171 DEFUNX ("P_tmpdir", FP_tmpdir, args, , | |
2172 "-*- texinfo -*-\n\ | |
2173 @deftypefn {Built-in Function} {} P_tmpdir ()\n\ | |
2174 Return the default name of the directory for temporary files on\n\ | |
2175 this system. The name of this directory is system dependent.\n\ | |
2176 @end deftypefn") | |
2177 { | |
2178 octave_value retval; | |
2179 | |
2180 int nargin = args.length (); | |
4267 | 2181 |
5749 | 2182 if (nargin == 0) |
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|
2183 retval = get_P_tmpdir (); |
5749 | 2184 else |
5823 | 2185 print_usage (); |
5749 | 2186 |
2187 return retval; | |
2188 } | |
2341 | 2189 |
5749 | 2190 // NOTE: the values of SEEK_SET, SEEK_CUR, and SEEK_END have to be |
2191 // this way for Matlab compatibility. | |
2192 | |
2193 DEFUNX ("SEEK_SET", FSEEK_SET, args, , | |
2194 "-*- texinfo -*-\n\ | |
10840 | 2195 @deftypefn {Built-in Function} {} SEEK_SET ()\n\ |
5749 | 2196 @deftypefnx {Built-in Function} {} SEEK_CUR ()\n\ |
2197 @deftypefnx {Built-in Function} {} SEEK_END ()\n\ | |
14171
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|
2198 Return the numerical value to pass to @code{fseek} to perform\n\ |
5749 | 2199 one of the following actions:\n\ |
14366
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|
2200 \n\ |
3372 | 2201 @table @code\n\ |
2202 @item SEEK_SET\n\ | |
2203 Position file relative to the beginning.\n\ | |
2204 \n\ | |
2205 @item SEEK_CUR\n\ | |
2206 Position file relative to the current position.\n\ | |
2207 \n\ | |
2208 @item SEEK_END\n\ | |
5749 | 2209 Position file relative to the end.\n\ |
3372 | 2210 @end table\n\ |
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2211 @seealso{fseek}\n\ |
5749 | 2212 @end deftypefn") |
2213 { | |
2214 return const_value ("SEEK_SET", args, -1); | |
2215 } | |
2189 | 2216 |
5749 | 2217 DEFUNX ("SEEK_CUR", FSEEK_CUR, args, , |
2218 "-*- texinfo -*-\n\ | |
2219 @deftypefn {Built-in Function} {} SEEK_CUR ()\n\ | |
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2220 Return the numerical value to pass to @code{fseek} to\n\ |
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2221 position the file pointer relative to the current position.\n\ |
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2222 @seealso{SEEK_SET, SEEK_END}.\n\ |
5749 | 2223 @end deftypefn") |
2224 { | |
2225 return const_value ("SEEK_CUR", args, 0); | |
2226 } | |
2189 | 2227 |
5749 | 2228 DEFUNX ("SEEK_END", FSEEK_END, args, , |
2229 "-*- texinfo -*-\n\ | |
2230 @deftypefn {Built-in Function} {} SEEK_END ()\n\ | |
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2231 Return the numerical value to pass to @code{fseek} to\n\ |
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2232 position the file pointer relative to the end of the file.\n\ |
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2233 @seealso{SEEK_SET, SEEK_CUR}.\n\ |
5749 | 2234 @end deftypefn") |
2235 { | |
2236 return const_value ("SEEK_END", args, 1); | |
2237 } | |
2238 | |
2239 static octave_value | |
6483 | 2240 const_value (const char *, const octave_value_list& args, |
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2241 const octave_value& val) |
5749 | 2242 { |
2243 octave_value retval; | |
2244 | |
2245 int nargin = args.length (); | |
2189 | 2246 |
5749 | 2247 if (nargin == 0) |
2248 retval = val; | |
2249 else | |
5823 | 2250 print_usage (); |
5749 | 2251 |
2252 return retval; | |
2253 } | |
2254 | |
2255 DEFUNX ("stdin", Fstdin, args, , | |
2256 "-*- texinfo -*-\n\ | |
2257 @deftypefn {Built-in Function} {} stdin ()\n\ | |
2258 Return the numeric value corresponding to the standard input stream.\n\ | |
2259 When Octave is used interactively, this is filtered through the command\n\ | |
2260 line editing functions.\n\ | |
5333 | 2261 @seealso{stdout, stderr}\n\ |
5749 | 2262 @end deftypefn") |
2263 { | |
2264 return const_value ("stdin", args, stdin_file); | |
2265 } | |
2189 | 2266 |
5749 | 2267 DEFUNX ("stdout", Fstdout, args, , |
2268 "-*- texinfo -*-\n\ | |
2269 @deftypefn {Built-in Function} {} stdout ()\n\ | |
2270 Return the numeric value corresponding to the standard output stream.\n\ | |
2271 Data written to the standard output is normally filtered through the pager.\n\ | |
5333 | 2272 @seealso{stdin, stderr}\n\ |
5749 | 2273 @end deftypefn") |
2274 { | |
2275 return const_value ("stdout", args, stdout_file); | |
2276 } | |
2189 | 2277 |
5749 | 2278 DEFUNX ("stderr", Fstderr, args, , |
2279 "-*- texinfo -*-\n\ | |
2280 @deftypefn {Built-in Function} {} stderr ()\n\ | |
2281 Return the numeric value corresponding to the standard error stream.\n\ | |
2282 Even if paging is turned on, the standard error is not sent to the\n\ | |
2283 pager. It is useful for error messages and prompts.\n\ | |
5333 | 2284 @seealso{stdin, stdout}\n\ |
5749 | 2285 @end deftypefn") |
2286 { | |
2287 return const_value ("stderr", args, stderr_file); | |
2189 | 2288 } |