Mercurial > octave
annotate liboctave/util/kpse.cc @ 27679:748aea34aecd
* kpse.cc (READABLE): Prefixing "\\?\" only works for absolute paths (bug #57215).
author | Markus Mützel <markus.muetzel@gmx.de> |
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date | Tue, 12 Nov 2019 22:36:17 +0100 |
parents | 12f28f9368ec |
children | b442ec6dda5c |
rev | line source |
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1 // This file is not compiled to a separate object file. |
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2 // It is included in pathsearch.cc. |
4399 | 3 |
4 /* Look up a filename in a path. | |
4378 | 5 |
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6 Copyright (C) 2003-2019 John W. Eaton |
4385 | 7 Copyright (C) 1993, 94, 95, 96, 97, 98 Karl Berry. |
4378 | 8 Copyright (C) 1993, 94, 95, 96, 97 Karl Berry & O. Weber. |
4399 | 9 Copyright (C) 1992, 93, 94, 95, 96, 97 Free Software Foundation, Inc. |
4378 | 10 |
16768 | 11 This file is part of Octave. |
12 | |
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13 Octave is free software: you can redistribute it and/or modify it |
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14 under the terms of the GNU General Public License as published by |
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15 the Free Software Foundation, either version 3 of the License, or |
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16 (at your option) any later version. |
16768 | 17 |
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18 Octave is distributed in the hope that it will be useful, but |
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19 WITHOUT ANY WARRANTY; without even the implied warranty of |
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20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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21 GNU General Public License for more details. |
16768 | 22 |
23 You should have received a copy of the GNU General Public License | |
24 along with Octave; see the file COPYING. If not, see | |
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25 <https://www.gnu.org/licenses/>. |
16768 | 26 |
27 */ | |
4378 | 28 |
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29 #if defined (HAVE_CONFIG_H) |
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30 # include "config.h" |
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31 #endif |
4378 | 32 |
21874 | 33 #include <cctype> |
34 #include <cerrno> | |
35 #include <cstdlib> | |
36 | |
4390 | 37 #include <map> |
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38 #include <fstream> |
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39 #include <iostream> |
4389 | 40 #include <string> |
41 | |
21926 | 42 #include "dir-ops.h" |
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43 #include "file-ops.h" |
21865 | 44 #include "file-stat.h" |
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45 #include "kpse.h" |
4391 | 46 #include "oct-env.h" |
47 #include "oct-passwd.h" | |
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48 #include "oct-time.h" |
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49 #include "pathsearch.h" |
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50 #include "unistd-wrappers.h" |
4385 | 51 |
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52 #if defined (OCTAVE_USE_WINDOWS_API) |
21874 | 53 # define WIN32_LEAN_AND_MEAN 1 |
54 # include <windows.h> | |
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55 |
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56 # include "lo-sysdep.h" |
21874 | 57 #endif |
4385 | 58 |
21874 | 59 // Define the characters which separate components of filenames and |
60 // environment variable paths. | |
4385 | 61 |
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62 #define IS_DEVICE_SEP(ch) octave::sys::file_ops::is_dev_sep (ch) |
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63 #define NAME_BEGINS_WITH_DEVICE(name) \ |
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64 (name.length () > 0 && IS_DEVICE_SEP ((name)[1])) |
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65 |
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66 #define DIR_SEP_STRING octave::sys::file_ops::dir_sep_str () |
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67 #define IS_DIR_SEP(ch) octave::sys::file_ops::is_dir_sep (ch) |
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68 |
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69 #define ENV_SEP octave::directory_path::path_sep_char () |
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70 #define ENV_SEP_STRING octave::directory_path::path_sep_str () |
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71 #define IS_ENV_SEP(ch) octave::directory_path::is_path_sep (ch) |
21874 | 72 |
73 // If NO_DEBUG is defined (not recommended), skip all this. | |
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74 #if ! defined (NO_DEBUG) |
4385 | 75 |
21874 | 76 // OK, we'll have tracing support. |
77 # define KPSE_DEBUG | |
4385 | 78 |
21874 | 79 // Test if a bit is on. |
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80 # define KPSE_DEBUG_P(bit) (kpse_debug & (1 << (bit))) |
4385 | 81 |
21874 | 82 # define KPSE_DEBUG_STAT 0 // stat calls |
83 # define KPSE_DEBUG_EXPAND 1 // path element expansion | |
84 # define KPSE_DEBUG_SEARCH 2 // searches | |
85 # define KPSE_DEBUG_VARS 3 // variable values | |
86 # define KPSE_LAST_DEBUG KPSE_DEBUG_VARS | |
4385 | 87 |
21874 | 88 #endif |
4385 | 89 |
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90 unsigned int kpse_debug = 0; |
4399 | 91 |
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92 void |
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93 kpse_path_iterator::set_end (void) |
4394 | 94 { |
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95 m_e = m_b + 1; |
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96 |
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97 if (m_e == m_len) |
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98 ; // OK, we have found the last element. |
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99 else if (m_e > m_len) |
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100 m_b = m_e = std::string::npos; |
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101 else |
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102 { |
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103 // Find the next colon not enclosed by braces (or the end of the |
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104 // path). |
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105 |
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106 while (m_e < m_len && ! octave::directory_path::is_path_sep (m_path[m_e])) |
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107 m_e++; |
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108 } |
4394 | 109 } |
110 | |
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111 void |
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112 kpse_path_iterator::next (void) |
4399 | 113 { |
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114 m_b = m_e + 1; |
4399 | 115 |
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116 // Skip any consecutive colons. |
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117 while (m_b < m_len && octave::directory_path::is_path_sep (m_path[m_b])) |
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118 m_b++; |
4399 | 119 |
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120 if (m_b >= m_len) |
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121 m_b = m_e = std::string::npos; |
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122 else |
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123 set_end (); |
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124 } |
4399 | 125 |
4391 | 126 /* Truncate any too-long components in NAME, returning the result. It's |
127 too bad this is necessary. See comments in readable.c for why. */ | |
128 | |
4393 | 129 static std::string |
130 kpse_truncate_filename (const std::string& name) | |
4391 | 131 { |
132 unsigned c_len = 0; /* Length of current component. */ | |
133 unsigned ret_len = 0; /* Length of constructed result. */ | |
134 | |
4393 | 135 std::string ret = name; |
136 | |
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137 size_t m_len = name.length (); |
4393 | 138 |
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139 for (size_t i = 0; i < m_len; i++) |
4391 | 140 { |
4393 | 141 if (IS_DIR_SEP (name[i]) || IS_DEVICE_SEP (name[i])) |
4391 | 142 { |
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143 /* At a directory delimiter, reset component length. */ |
4391 | 144 c_len = 0; |
145 } | |
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146 else if (c_len > octave::sys::dir_entry::max_name_length ()) |
4391 | 147 { |
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148 /* If past the max for a component, ignore this character. */ |
4391 | 149 continue; |
150 } | |
151 | |
152 /* Copy this character. */ | |
4393 | 153 ret[ret_len++] = name[i]; |
4391 | 154 c_len++; |
155 } | |
156 | |
4393 | 157 ret.resize (ret_len); |
4391 | 158 |
159 return ret; | |
160 } | |
161 | |
162 /* If access can read FN, run stat (assigning to stat buffer ST) and | |
163 check that fn is not a directory. Don't check for just being a | |
164 regular file, as it is potentially useful to read fifo's or some | |
165 kinds of devices. */ | |
166 | |
167 static inline bool | |
21865 | 168 READABLE (const std::string& fn) |
4391 | 169 { |
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170 #if defined (OCTAVE_USE_WINDOWS_API) |
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171 |
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172 std::wstring w_fn = octave::sys::u8_to_wstring (fn); |
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173 |
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174 DWORD f_attr = GetFileAttributesW (w_fn.c_str ()); |
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175 |
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176 return (f_attr != 0xFFFFFFFF && ! (f_attr & FILE_ATTRIBUTE_DIRECTORY)); |
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177 |
4391 | 178 #else |
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179 |
21865 | 180 bool retval = false; |
181 | |
4393 | 182 const char *t = fn.c_str (); |
21865 | 183 |
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184 if (octave_access_wrapper (t, octave_access_r_ok ()) == 0) |
21865 | 185 { |
186 octave::sys::file_stat fs (fn); | |
187 | |
188 retval = fs && ! fs.is_dir (); | |
189 } | |
190 | |
191 return retval; | |
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192 |
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193 #endif |
4391 | 194 } |
195 | |
196 /* POSIX invented the brain-damage of not necessarily truncating | |
197 filename components; the system's behavior is defined by the value of | |
198 the symbol _POSIX_NO_TRUNC, but you can't change it dynamically! | |
199 | |
200 Generic const return warning. See extend-fname.c. */ | |
201 | |
4393 | 202 static std::string |
203 kpse_readable_file (const std::string& name) | |
4391 | 204 { |
4393 | 205 std::string ret; |
4391 | 206 |
21865 | 207 if (READABLE (name)) |
4391 | 208 { |
4393 | 209 ret = name; |
4391 | 210 |
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211 #if defined (ENAMETOOLONG) |
4391 | 212 } |
213 else if (errno == ENAMETOOLONG) | |
214 { | |
215 ret = kpse_truncate_filename (name); | |
216 | |
217 /* Perhaps some other error will occur with the truncated name, | |
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218 so let's call access again. */ |
4391 | 219 |
21865 | 220 if (! READABLE (ret)) |
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221 { |
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222 /* Failed. */ |
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223 ret = ""; |
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224 } |
4391 | 225 #endif /* ENAMETOOLONG */ |
226 | |
227 } | |
228 else | |
229 { | |
230 /* Some other error. */ | |
231 if (errno == EACCES) | |
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232 { |
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233 /* Maybe warn them if permissions are bad. */ |
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234 perror (name.c_str ()); |
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235 } |
4393 | 236 |
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237 ret = ""; |
4391 | 238 } |
239 | |
240 return ret; | |
241 } | |
242 | |
243 static bool | |
244 kpse_absolute_p (const std::string& filename, int relative_ok) | |
245 { | |
21865 | 246 return (octave::sys::env::absolute_pathname (filename) |
247 || (relative_ok | |
248 && octave::sys::env::rooted_relative_pathname (filename))); | |
4391 | 249 } |
250 | |
4378 | 251 /* The very first search is for texmf.cnf, called when someone tries to |
252 initialize the TFM path or whatever. init_path calls kpse_cnf_get | |
253 which calls kpse_all_path_search to find all the texmf.cnf's. We | |
254 need to do various special things in this case, since we obviously | |
255 don't yet have the configuration files when we're searching for the | |
256 configuration files. */ | |
257 static bool first_search = true; | |
258 | |
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259 /* This function is called after every search. */ |
4378 | 260 |
261 static void | |
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262 log_search (const std::list<std::string>& filenames) |
4378 | 263 { |
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264 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) |
4391 | 265 { |
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266 for (const auto& filename : filenames) |
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267 { |
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268 octave::sys::time now; |
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269 std::cerr << now.unix_time () << ' ' << filename << std::endl; |
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270 } |
4378 | 271 } |
272 } | |
4392 | 273 |
4378 | 274 /* Concatenate each element in DIRS with NAME (assume each ends with a |
275 /, to save time). If SEARCH_ALL is false, return the first readable | |
276 regular file. Else continue to search for more. In any case, if | |
277 none, return a list containing just NULL. | |
278 | |
279 We keep a single buffer for the potential filenames and reallocate | |
280 only when necessary. I'm not sure it's noticeably faster, but it | |
281 does seem cleaner. (We do waste a bit of space in the return | |
282 value, though, since we don't shrink it to the final size returned.) */ | |
283 | |
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284 static std::list<std::string> |
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285 dir_search (const std::string& dir, const std::string& name, |
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286 bool search_all) |
4378 | 287 { |
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288 std::list<std::string> ret; |
4378 | 289 |
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290 std::string potential = dir + name; |
4393 | 291 |
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292 std::string tmp = kpse_readable_file (potential); |
4393 | 293 |
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294 if (! tmp.empty ()) |
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295 { |
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296 ret.push_back (potential); |
4391 | 297 |
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298 if (! search_all) |
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299 return ret; |
4378 | 300 } |
4391 | 301 |
4378 | 302 return ret; |
303 } | |
4392 | 304 |
4378 | 305 /* This is called when NAME is absolute or explicitly relative; if it's |
306 readable, return (a list containing) it; otherwise, return NULL. */ | |
307 | |
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308 static std::list<std::string> |
4393 | 309 absolute_search (const std::string& name) |
4378 | 310 { |
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311 std::list<std::string> ret_list; |
4393 | 312 std::string found = kpse_readable_file (name); |
4391 | 313 |
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314 /* Add 'found' to the return list even if it's null; that tells |
4378 | 315 the caller we didn't find anything. */ |
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316 ret_list.push_back (found); |
4391 | 317 |
4378 | 318 return ret_list; |
319 } | |
4392 | 320 |
4378 | 321 /* This is the hard case -- look for NAME in PATH. If ALL is false, |
322 return the first file found. Otherwise, search all elements of PATH. */ | |
323 | |
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324 static std::list<std::string> |
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325 path_search (const std::string& path, const std::string& name, bool all) |
4378 | 326 { |
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327 std::list<std::string> ret_list; |
4378 | 328 bool done = false; |
4390 | 329 |
8021 | 330 for (kpse_path_iterator pi (path); ! done && pi != std::string::npos; pi++) |
4390 | 331 { |
4394 | 332 std::string elt = *pi; |
333 | |
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334 std::list<std::string> found; |
4390 | 335 |
336 /* Do not touch the device if present */ | |
337 if (NAME_BEGINS_WITH_DEVICE (elt)) | |
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338 { |
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339 while (elt.length () > 3 |
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340 && IS_DIR_SEP (elt[2]) && IS_DIR_SEP (elt[3])) |
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341 { |
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342 elt[2] = elt[1]; |
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343 elt[1] = elt[0]; |
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344 elt = elt.substr (1); |
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345 } |
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346 } |
4390 | 347 else |
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348 { |
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349 /* We never want to search the whole disk. */ |
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350 while (elt.length () > 1 |
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351 && IS_DIR_SEP (elt[0]) && IS_DIR_SEP (elt[1])) |
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352 elt = elt.substr (1); |
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353 } |
4391 | 354 |
21872 | 355 /* Our caller (search), also tests first_search, and does |
356 the resetting. */ | |
21865 | 357 if (first_search) |
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358 found = std::list<std::string> (); |
21865 | 359 |
360 /* Search the filesystem. */ | |
361 | |
362 if (found.empty ()) | |
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363 { |
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364 std::string dir = kpse_element_dir (elt); |
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365 |
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366 if (! dir.empty ()) |
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367 found = dir_search (dir, name, all); |
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368 } |
4390 | 369 |
370 /* Did we find anything anywhere? */ | |
371 if (! found.empty ()) | |
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372 { |
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373 if (all) |
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374 ret_list.splice (ret_list.end (), found); |
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375 else |
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376 { |
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377 ret_list.push_back (found.front ()); |
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378 done = true; |
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379 } |
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380 } |
4378 | 381 } |
382 | |
383 return ret_list; | |
4390 | 384 } |
4392 | 385 |
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386 /* If NAME has a leading ~ or ~user, Unix-style, expand it to the user's |
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387 home directory, and return a new malloced string. If no ~, or no |
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388 <pwd.h>, just return NAME. */ |
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389 |
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390 static std::string |
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391 kpse_tilde_expand (const std::string& name) |
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392 { |
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393 std::string expansion; |
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394 |
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395 /* If no leading tilde, do nothing. */ |
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396 if (name.empty () || name[0] != '~') |
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397 { |
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398 expansion = name; |
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399 |
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400 /* If a bare tilde, return the home directory or '.'. (Very |
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401 unlikely that the directory name will do anyone any good, but |
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402 ... */ |
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403 } |
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404 else if (name.length () == 1) |
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405 { |
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406 expansion = octave::sys::env::get_home_directory (); |
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407 |
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408 if (expansion.empty ()) |
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409 expansion = "."; |
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410 |
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411 /* If '~/', remove any trailing / or replace leading // in $HOME. |
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412 Should really check for doubled intermediate slashes, too. */ |
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413 } |
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414 else if (IS_DIR_SEP (name[1])) |
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415 { |
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416 unsigned c = 1; |
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417 std::string home = octave::sys::env::get_home_directory (); |
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418 |
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419 if (home.empty ()) |
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420 home = "."; |
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421 |
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422 size_t home_len = home.length (); |
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423 |
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424 /* handle leading // */ |
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425 if (home_len > 1 && IS_DIR_SEP (home[0]) && IS_DIR_SEP (home[1])) |
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426 home = home.substr (1); |
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427 |
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428 /* omit / after ~ */ |
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429 if (IS_DIR_SEP (home[home_len - 1])) |
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430 c++; |
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431 |
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432 expansion = home + name.substr (c); |
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433 |
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434 /* If '~user' or '~user/', look up user in the passwd database (but |
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435 OS/2 doesn't have this concept. */ |
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436 } |
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437 else |
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438 #if defined (HAVE_PWD_H) |
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439 { |
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440 unsigned c = 2; |
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441 |
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442 /* find user name */ |
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443 while (name.length () > c && ! IS_DIR_SEP (name[c])) |
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444 c++; |
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445 |
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446 std::string user = name.substr (1, c-1); |
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447 |
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448 /* We only need the cast here for (deficient) systems |
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449 which do not declare 'getpwnam' in <pwd.h>. */ |
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450 octave::sys::password p = octave::sys::password::getpwnam (user); |
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451 |
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452 /* If no such user, just use '.'. */ |
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453 std::string home = (p ? p.dir () : "."); |
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454 |
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455 if (home.empty ()) |
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456 home = "."; |
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457 |
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458 /* handle leading // */ |
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459 if (home.length () > 1 && IS_DIR_SEP (home[0]) && IS_DIR_SEP (home[1])) |
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460 home = home.substr (1); |
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461 |
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462 /* If HOME ends in /, omit the / after ~user. */ |
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463 if (name.length () > c && IS_DIR_SEP (home.back ())) |
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464 c++; |
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465 |
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466 expansion = (name.length () > c ? home : home + name.substr (c)); |
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467 } |
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468 #else /* not HAVE_PWD_H */ |
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469 expansion = name; |
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470 #endif /* not HAVE_PWD_H */ |
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471 |
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472 return expansion; |
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473 } |
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474 |
4378 | 475 /* Search PATH for ORIGINAL_NAME. If ALL is false, or ORIGINAL_NAME is |
476 absolute_p, check ORIGINAL_NAME itself. Otherwise, look at each | |
477 element of PATH for the first readable ORIGINAL_NAME. | |
4391 | 478 |
4378 | 479 Always return a list; if no files are found, the list will |
480 contain just NULL. If ALL is true, the list will be | |
481 terminated with NULL. */ | |
482 | |
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483 static std::list<std::string> |
4390 | 484 search (const std::string& path, const std::string& original_name, |
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485 bool all) |
4378 | 486 { |
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487 std::list<std::string> ret_list; |
4378 | 488 bool absolute_p; |
489 | |
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490 /* Make a leading ~ count as an absolute filename. */ |
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491 std::string name = kpse_tilde_expand (original_name); |
4391 | 492 |
4378 | 493 /* If the first name is absolute or explicitly relative, no need to |
494 consider PATH at all. */ | |
495 absolute_p = kpse_absolute_p (name, true); | |
4391 | 496 |
4378 | 497 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) |
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498 std::cerr << "kdebug: start search (file=" << name |
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499 << ", find_all=" << all << ", path=" << path << ")." |
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500 << std::endl; |
4378 | 501 |
502 /* Find the file(s). */ | |
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503 ret_list = (absolute_p |
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504 ? absolute_search (name) |
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505 : path_search (path, name, all)); |
4391 | 506 |
4378 | 507 /* The very first search is for texmf.cnf. We can't log that, since |
508 we want to allow setting TEXMFLOG in texmf.cnf. */ | |
4391 | 509 if (first_search) |
510 { | |
511 first_search = false; | |
512 } | |
513 else | |
514 { | |
515 /* Record the filenames we found, if desired. And wrap them in a | |
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516 debugging line if we're doing that. */ |
4391 | 517 |
518 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) | |
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519 std::cerr << "kdebug: search (" << original_name << ") =>"; |
4391 | 520 |
521 log_search (ret_list); | |
522 | |
523 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) | |
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524 std::cerr << std::endl; |
4391 | 525 } |
4378 | 526 |
4390 | 527 return ret_list; |
4378 | 528 } |
4392 | 529 |
4378 | 530 /* Search PATH for the first NAME. */ |
531 | |
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532 /* Perform tilde expansion on NAME. If the result is an absolute or |
4399 | 533 explicitly relative filename, check whether it is a readable |
534 (regular) file. | |
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535 |
4399 | 536 Otherwise, look in each of the directories specified in PATH (also do |
21865 | 537 tilde and variable expansion on elements in PATH). |
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538 |
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539 The caller must expand PATH. This is because it makes more sense to |
4399 | 540 do this once, in advance, instead of for every search using it. |
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541 |
4399 | 542 In any case, return the complete filename if found, otherwise NULL. */ |
543 | |
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544 std::string |
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545 kpse_path_search (const std::string& path, const std::string& name) |
4378 | 546 { |
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547 std::list<std::string> ret_list = search (path, name, false); |
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548 |
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549 return ret_list.empty () ? "" : ret_list.front (); |
4378 | 550 } |
551 | |
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552 /* Like 'kpse_path_search' with MUST_EXIST true, but return a list of |
4399 | 553 all the filenames (or NULL if none), instead of taking the first. */ |
554 | |
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555 std::list<std::string> |
4390 | 556 kpse_all_path_search (const std::string& path, const std::string& name) |
4378 | 557 { |
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558 return search (path, name, true); |
4378 | 559 } |
4392 | 560 |
4378 | 561 /* This is the hard case -- look in each element of PATH for each |
562 element of NAMES. If ALL is false, return the first file found. | |
563 Otherwise, search all elements of PATH. */ | |
564 | |
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565 std::list<std::string> |
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566 path_find_first_of (const std::string& path, |
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567 const std::list<std::string>& names, bool all) |
4378 | 568 { |
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569 std::list<std::string> ret_list; |
4378 | 570 bool done = false; |
4390 | 571 |
8021 | 572 for (kpse_path_iterator pi (path); ! done && pi != std::string::npos; pi++) |
4378 | 573 { |
4394 | 574 std::string elt = *pi; |
575 | |
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576 std::string dir; |
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577 std::list<std::string> found; |
4378 | 578 |
579 /* Do not touch the device if present */ | |
580 | |
581 if (NAME_BEGINS_WITH_DEVICE (elt)) | |
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582 { |
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583 while (elt.length () > 3 |
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584 && IS_DIR_SEP (elt[2]) && IS_DIR_SEP (elt[3])) |
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585 { |
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586 elt[2] = elt[1]; |
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587 elt[1] = elt[0]; |
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588 elt = elt.substr (1); |
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589 } |
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590 } |
4378 | 591 else |
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592 { |
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593 /* We never want to search the whole disk. */ |
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594 while (elt.length () > 1 |
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595 && IS_DIR_SEP (elt[0]) && IS_DIR_SEP (elt[1])) |
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596 elt = elt.substr (1); |
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597 } |
4378 | 598 |
599 /* We have to search one directory at a time. */ | |
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600 dir = kpse_element_dir (elt); |
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601 |
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602 if (! dir.empty ()) |
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603 { |
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604 for (auto it = names.cbegin (); it != names.cend () && ! done; it++) |
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605 { |
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606 std::string name = *it; |
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607 |
21872 | 608 /* Our caller (find_first_of), also tests first_search, |
609 and does the resetting. */ | |
21865 | 610 if (first_search) |
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611 found = std::list<std::string> (); |
21865 | 612 |
613 /* Search the filesystem. */ | |
614 | |
615 if (found.empty ()) | |
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616 found = dir_search (dir, name, all); |
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617 |
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618 /* Did we find anything anywhere? */ |
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619 if (! found.empty ()) |
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620 { |
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621 if (all) |
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622 ret_list.splice (ret_list.end (), found); |
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623 else |
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624 { |
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625 ret_list.push_back (found.front ()); |
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626 done = true; |
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627 } |
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628 } |
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629 } |
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630 } |
4378 | 631 } |
632 | |
633 return ret_list; | |
4391 | 634 } |
4378 | 635 |
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636 static std::list<std::string> |
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637 find_first_of (const std::string& path, const std::list<std::string>& names, |
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638 bool all) |
4378 | 639 { |
21867
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640 std::list<std::string> ret_list; |
4378 | 641 |
642 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) | |
643 { | |
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644 std::cerr << "kdebug: start find_first_of ("; |
4391 | 645 |
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646 for (auto p = names.cbegin (); p != names.cend (); p++) |
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647 { |
21867
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648 if (p == names.cbegin ()) |
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649 std::cerr << *p; |
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650 else |
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651 std::cerr << ", " << *p; |
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652 } |
4391 | 653 |
23807
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Use character literals 'c' rather than string literals "c" when possible.
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654 std::cerr << "), path=" << path << '.' << std::endl; |
4378 | 655 } |
656 | |
23433
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657 for (const auto& name : names) |
4409 | 658 { |
659 if (kpse_absolute_p (name, true)) | |
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660 { |
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661 /* If the name is absolute or explicitly relative, no need |
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662 to consider PATH at all. If we find something, then we |
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663 are done. */ |
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664 |
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665 ret_list = absolute_search (name); |
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666 |
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667 if (! ret_list.empty ()) |
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668 return ret_list; |
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669 } |
4409 | 670 } |
671 | |
4378 | 672 /* Find the file. */ |
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673 ret_list = path_find_first_of (path, names, all); |
4378 | 674 |
675 /* The very first search is for texmf.cnf. We can't log that, since | |
676 we want to allow setting TEXMFLOG in texmf.cnf. */ | |
4391 | 677 if (first_search) |
678 { | |
679 first_search = false; | |
680 } | |
681 else | |
682 { | |
683 /* Record the filenames we found, if desired. And wrap them in a | |
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684 debugging line if we're doing that. */ |
4391 | 685 |
686 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) | |
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687 { |
21868
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688 std::cerr << "kdebug: find_first_of ("; |
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689 |
21867
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690 for (auto p = names.cbegin (); p != names.cend (); p++) |
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691 { |
21867
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692 if (p == names.cbegin ()) |
24199
2ac103974d00
Remove extra space between scope operator '::' and function.
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693 std::cerr << *p; |
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694 else |
21868
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695 std::cerr << ", " << *p; |
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696 } |
10411 | 697 |
21868
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698 std::cerr << ") =>"; |
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699 } |
4391 | 700 |
701 log_search (ret_list); | |
702 | |
703 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) | |
21887
525b46f1d48f
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704 std::cerr << std::endl; |
4391 | 705 } |
4378 | 706 |
4390 | 707 return ret_list; |
4378 | 708 } |
709 | |
710 /* Search each element of PATH for each element of NAMES. Return the | |
711 first one found. */ | |
712 | |
4399 | 713 /* Search each element of PATH for each element in the list of NAMES. |
714 Return the first one found. */ | |
715 | |
21883
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716 std::string |
21867
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717 kpse_path_find_first_of (const std::string& path, |
21884
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718 const std::list<std::string>& names) |
4378 | 719 { |
21884
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720 std::list<std::string> ret_list = find_first_of (path, names, false); |
21867
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721 |
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722 return ret_list.empty () ? "" : ret_list.front (); |
4378 | 723 } |
724 | |
725 /* Search each element of PATH for each element of NAMES and return a | |
726 list containing everything found, in the order found. */ | |
727 | |
15466
d174210ce1ec
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|
728 /* Like 'kpse_path_find_first_of' with MUST_EXIST true, but return a |
4399 | 729 list of all the filenames (or NULL if none), instead of taking the |
730 first. */ | |
731 | |
21883
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732 std::list<std::string> |
4390 | 733 kpse_all_path_find_first_of (const std::string& path, |
21867
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734 const std::list<std::string>& names) |
4378 | 735 { |
21884
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736 return find_first_of (path, names, true); |
4378 | 737 } |
738 | |
26175
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739 /* Perform tilde expansion on each element of the path, and include |
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740 canonical directory names for only the the actually existing |
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741 directories in the result. */ |
4399 | 742 |
21883
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743 std::string |
4397 | 744 kpse_path_expand (const std::string& path) |
4378 | 745 { |
4392 | 746 std::string ret; |
26175
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747 unsigned len = 0; |
4392 | 748 |
4378 | 749 /* Now expand each of the path elements, printing the results */ |
26175
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750 for (kpse_path_iterator pi (path); pi != std::string::npos; pi++) |
4391 | 751 { |
26175
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|
752 std::string elt = kpse_tilde_expand (*pi); |
4394 | 753 |
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754 std::string dir; |
4391 | 755 |
756 /* Do not touch the device if present */ | |
757 if (NAME_BEGINS_WITH_DEVICE (elt)) | |
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758 { |
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759 while (elt.length () > 3 |
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760 && IS_DIR_SEP (elt[2]) && IS_DIR_SEP (elt[3])) |
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761 { |
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762 elt[2] = elt[1]; |
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763 elt[1] = elt[0]; |
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764 elt = elt.substr (1); |
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765 } |
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766 } |
4391 | 767 else |
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768 { |
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769 /* We never want to search the whole disk. */ |
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770 while (elt.length () > 1 |
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771 && IS_DIR_SEP (elt[0]) && IS_DIR_SEP (elt[1])) |
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772 elt = elt.substr (1); |
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773 } |
4378 | 774 |
4394 | 775 /* Search the disk for all dirs in the component specified. |
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776 Be faster to check the database, but this is more reliable. */ |
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777 dir = kpse_element_dir (elt); |
4394 | 778 |
21873
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779 size_t dirlen = dir.length (); |
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780 |
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781 if (dirlen > 0) |
10314
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782 { |
21873
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783 ret += dir; |
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784 len += dirlen; |
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785 |
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786 /* Retain trailing slash if that's the root directory. */ |
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787 if (dirlen == 1 |
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788 || (dirlen == 3 && NAME_BEGINS_WITH_DEVICE (dir) |
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789 && IS_DIR_SEP (dir[2]))) |
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790 { |
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791 ret += ENV_SEP_STRING; |
40195d04b17c
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|
792 len++; |
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|
793 } |
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|
794 |
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795 ret[len-1] = ENV_SEP; |
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796 } |
4378 | 797 } |
4391 | 798 |
23812
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Use C++11 string fcns back() and pop_back() to simplify code.
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|
799 if (! ret.empty ()) |
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Use C++11 string fcns back() and pop_back() to simplify code.
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800 ret.pop_back (); |
4391 | 801 |
4378 | 802 return ret; |
803 } | |
4392 | 804 |
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805 /* braces.c -- code for doing word expansion in curly braces. Taken from |
16768 | 806 bash 1.14.5. [And subsequently modified for kpatshea.] |
807 | |
808 Copyright (C) 1987,1991 Free Software Foundation, Inc. */ | |
4378 | 809 |
4391 | 810 #define brace_whitespace(c) (! (c) || (c) == ' ' || (c) == '\t' || (c) == '\n') |
4378 | 811 |
812 /* Basic idea: | |
813 | |
814 Segregate the text into 3 sections: preamble (stuff before an open brace), | |
815 postamble (stuff after the matching close brace) and amble (stuff after | |
816 preamble, and before postamble). Expand amble, and then tack on the | |
817 expansions to preamble. Expand postamble, and tack on the expansions to | |
4391 | 818 the result so far. */ |
4378 | 819 |
4397 | 820 /* Return a new array of strings which is the result of appending each |
821 string in ARR2 to each string in ARR1. The resultant array is | |
822 len (arr1) * len (arr2) long. For convenience, ARR1 (and its contents) | |
823 are free ()'ed. ARR1 can be NULL, in that case, a new version of ARR2 | |
824 is returned. */ | |
825 | |
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|
826 static std::list<std::string> |
0cdfd6d230e6
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|
827 array_concat (const std::list<std::string>& arr1, |
0cdfd6d230e6
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|
828 const std::list<std::string>& arr2) |
4378 | 829 { |
21867
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|
830 std::list<std::string> result; |
4397 | 831 |
832 if (arr1.empty ()) | |
833 result = arr2; | |
834 else if (arr2.empty ()) | |
835 result = arr1; | |
836 else | |
837 { | |
23433
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maint: Use convention 'int& x' for naming references.
Rik <rik@octave.org>
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diff
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|
838 for (const auto& elt_2 : arr2) |
c9fab0bc983e
maint: Use convention 'int& x' for naming references.
Rik <rik@octave.org>
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|
839 for (const auto& elt_1 : arr1) |
21867
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840 result.push_back (elt_1 + elt_2); |
4397 | 841 } |
842 | |
843 return result; | |
4378 | 844 } |
845 | |
4397 | 846 static int brace_gobbler (const std::string&, int&, int); |
21867
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|
847 static std::list<std::string> expand_amble (const std::string&); |
4378 | 848 |
849 /* Return an array of strings; the brace expansion of TEXT. */ | |
21867
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850 static std::list<std::string> |
4397 | 851 brace_expand (const std::string& text) |
4378 | 852 { |
853 /* Find the text of the preamble. */ | |
4397 | 854 int i = 0; |
855 int c = brace_gobbler (text, i, '{'); | |
856 | |
857 std::string preamble = text.substr (0, i); | |
858 | |
21867
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859 std::list<std::string> result (1, preamble); |
4397 | 860 |
861 if (c == '{') | |
4378 | 862 { |
4397 | 863 /* Find the amble. This is the stuff inside this set of braces. */ |
864 int start = ++i; | |
865 c = brace_gobbler (text, i, '}'); | |
866 | |
867 /* What if there isn't a matching close brace? */ | |
868 if (! c) | |
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869 { |
19410
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|
870 (*current_liboctave_warning_with_id_handler) |
95c533ed464b
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871 ("Octave:pathsearch-syntax", |
95c533ed464b
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|
872 "%s: Unmatched {", text.c_str ()); |
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|
873 |
21867
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874 result = std::list<std::string> (1, text); |
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875 } |
4397 | 876 else |
10314
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877 { |
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878 std::string amble = text.substr (start, i-start); |
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879 result = array_concat (result, expand_amble (amble)); |
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880 |
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881 std::string postamble = text.substr (i+1); |
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882 result = array_concat (result, brace_expand (postamble)); |
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883 } |
4378 | 884 } |
885 | |
4397 | 886 return result; |
4378 | 887 } |
888 | |
4397 | 889 /* The character which is used to separate arguments. */ |
890 static int brace_arg_separator = ','; | |
891 | |
4378 | 892 /* Expand the text found inside of braces. We simply try to split the |
893 text at BRACE_ARG_SEPARATORs into separate strings. We then brace | |
894 expand each slot which needs it, until there are no more slots which | |
895 need it. */ | |
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896 static std::list<std::string> |
4397 | 897 expand_amble (const std::string& text) |
4378 | 898 { |
21867
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899 std::list<std::string> result; |
4397 | 900 |
901 size_t text_len = text.length (); | |
902 size_t start; | |
903 int i, c; | |
904 | |
905 for (start = 0, i = 0, c = 1; c && start < text_len; start = ++i) | |
4378 | 906 { |
4397 | 907 int i0 = i; |
908 int c0 = brace_gobbler (text, i0, brace_arg_separator); | |
909 int i1 = i; | |
910 int c1 = brace_gobbler (text, i1, ENV_SEP); | |
4378 | 911 c = c0 | c1; |
912 i = (i0 < i1 ? i0 : i1); | |
913 | |
4397 | 914 std::string tem = text.substr (start, i-start); |
915 | |
21867
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916 std::list<std::string> partial = brace_expand (tem); |
4397 | 917 |
918 if (result.empty ()) | |
10314
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919 result = partial; |
4378 | 920 else |
21867
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921 result.splice (result.end (), partial); |
4378 | 922 } |
4397 | 923 |
924 return result; | |
4378 | 925 } |
926 | |
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927 /* Start at INDEX, and skip characters in TEXT. Set INDEX to the |
4378 | 928 index of the character matching SATISFY. This understands about |
929 quoting. Return the character that caused us to stop searching; | |
930 this is either the same as SATISFY, or 0. */ | |
931 static int | |
4397 | 932 brace_gobbler (const std::string& text, int& indx, int satisfy) |
4378 | 933 { |
18084
8e056300994b
Follow coding convention of defining and initializing only 1 variable per line in liboctave.
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934 int c = 0; |
8e056300994b
Follow coding convention of defining and initializing only 1 variable per line in liboctave.
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935 int level = 0; |
8e056300994b
Follow coding convention of defining and initializing only 1 variable per line in liboctave.
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936 int quoted = 0; |
8e056300994b
Follow coding convention of defining and initializing only 1 variable per line in liboctave.
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937 int pass_next = 0; |
4397 | 938 |
939 size_t text_len = text.length (); | |
940 | |
941 size_t i = indx; | |
942 | |
943 for (; i < text_len; i++) | |
4378 | 944 { |
4397 | 945 c = text[i]; |
946 | |
4378 | 947 if (pass_next) |
10314
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948 { |
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949 pass_next = 0; |
07ebe522dac2
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950 continue; |
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|
951 } |
4378 | 952 |
953 /* A backslash escapes the next character. This allows backslash to | |
10314
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954 escape the quote character in a double-quoted string. */ |
4378 | 955 if (c == '\\' && (quoted == 0 || quoted == '"' || quoted == '`')) |
956 { | |
957 pass_next = 1; | |
958 continue; | |
959 } | |
960 | |
961 if (quoted) | |
10314
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962 { |
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963 if (c == quoted) |
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964 quoted = 0; |
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|
965 continue; |
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|
966 } |
4378 | 967 |
968 if (c == '"' || c == '\'' || c == '`') | |
10314
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969 { |
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970 quoted = c; |
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971 continue; |
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972 } |
4391 | 973 |
20955
77f5591878bf
maint: Use '! expr' rather than '!expr' to conform to coding guidelines.
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974 if (c == satisfy && ! level && ! quoted) |
10314
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975 { |
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976 /* We ignore an open brace surrounded by whitespace, and also |
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977 an open brace followed immediately by a close brace, that |
07ebe522dac2
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978 was preceded with whitespace. */ |
19864
17d647821d61
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979 if (c == '{' |
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980 && ((i == 0 || brace_whitespace (text[i-1])) |
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981 && (i+1 < text_len |
17d647821d61
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982 && (brace_whitespace (text[i+1]) || text[i+1] == '}')))) |
10314
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983 continue; |
15466
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984 /* If this is being compiled as part of bash, ignore the '{' |
17769
49a5a4be04a1
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Rik <rik@octave.org>
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|
985 in a '${ }' construct */ |
10314
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986 if ((c != '{') || i == 0 || (text[i-1] != '$')) |
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987 break; |
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988 } |
4378 | 989 |
990 if (c == '{') | |
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991 level++; |
4378 | 992 else if (c == '}' && level) |
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993 level--; |
4378 | 994 } |
995 | |
4397 | 996 indx = i; |
26084
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Don't segfault for unmatched brace in PATH (bug #55013).
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997 c = (c == satisfy) ? c : 0; |
4397 | 998 return c; |
4378 | 999 } |
1000 | |
4390 | 1001 /* Return true if FN is a directory or a symlink to a directory, |
1002 false if not. */ | |
1003 | |
1004 static bool | |
1005 dir_p (const std::string& fn) | |
1006 { | |
21865 | 1007 octave::sys::file_stat fs (fn); |
1008 | |
1009 return (fs && fs.is_dir ()); | |
4390 | 1010 } |
4391 | 1011 |
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1012 /* Given a path element ELT, return a the element with a trailing slash |
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1013 or an empty string if the element is not a directory. |
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1014 |
4399 | 1015 It's up to the caller to expand ELT. This is because this routine is |
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1016 most likely only useful to be called from 'kpse_path_search', which |
4399 | 1017 has already assumed expansion has been done. */ |
1018 | |
21883
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1019 std::string |
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1020 kpse_element_dir (const std::string& elt) |
4378 | 1021 { |
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still more simplification of pathsearch
John W. Eaton <jwe@octave.org>
parents:
21872
diff
changeset
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1022 std::string ret; |
4378 | 1023 |
1024 /* If given nothing, return nothing. */ | |
4398 | 1025 if (elt.empty ()) |
21871
cab605836305
use std::list instead of custom list type in pathsearch code
John W. Eaton <jwe@octave.org>
parents:
21870
diff
changeset
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1026 return ret; |
4378 | 1027 |
21873
40195d04b17c
still more simplification of pathsearch
John W. Eaton <jwe@octave.org>
parents:
21872
diff
changeset
|
1028 if (dir_p (elt)) |
40195d04b17c
still more simplification of pathsearch
John W. Eaton <jwe@octave.org>
parents:
21872
diff
changeset
|
1029 { |
40195d04b17c
still more simplification of pathsearch
John W. Eaton <jwe@octave.org>
parents:
21872
diff
changeset
|
1030 ret = elt; |
4378 | 1031 |
23812
057a894914df
Use C++11 string fcns back() and pop_back() to simplify code.
Rik <rik@octave.org>
parents:
23807
diff
changeset
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1032 char last_char = ret.back (); |
21873
40195d04b17c
still more simplification of pathsearch
John W. Eaton <jwe@octave.org>
parents:
21872
diff
changeset
|
1033 |
40195d04b17c
still more simplification of pathsearch
John W. Eaton <jwe@octave.org>
parents:
21872
diff
changeset
|
1034 if (! (IS_DIR_SEP (last_char) || IS_DEVICE_SEP (last_char))) |
40195d04b17c
still more simplification of pathsearch
John W. Eaton <jwe@octave.org>
parents:
21872
diff
changeset
|
1035 ret += DIR_SEP_STRING; |
4378 | 1036 } |
1037 | |
1038 return ret; | |
1039 } |