Mercurial > octave
annotate liboctave/util/kpse.cc @ 21873:40195d04b17c
still more simplification of pathsearch
* kpse.cc (kpse_element_dir): Rename from kpse_element_dirs. Return
string instead of list of strings. Don't check cache.
(dir_search): Rename from dir_list_search. Search single directory
instead of list.
(match): Delete unused function.
(dir_list_add, checked_dir_list_add): Delete.
(cache_entry): Delete type.
(the_cache, cache_length, dirname;): Delete static variables.
(cache, cached): Delete.
(path_search, path_find_first_of, kpse_path_expand): Update.
* pathsearch.cc (directory_path::all_directories): Update.
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Sat, 11 Jun 2016 20:07:46 -0400 |
| parents | adb0b3ac4b50 |
| children | 7508f3a8e234 |
| 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) 2003-2015 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 | |
| 13 Octave is free software; you can redistribute it and/or modify it | |
| 14 under the terms of the GNU General Public License as published by the | |
| 15 Free Software Foundation; either version 3 of the License, or (at your | |
| 16 option) any later version. | |
| 17 | |
| 18 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 19 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 20 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 21 for more details. | |
| 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 | |
| 25 <http://www.gnu.org/licenses/>. | |
| 26 | |
| 27 */ | |
| 4378 | 28 |
|
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29 // This file should not include config.h. It is only included in other |
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30 // C++ source files that should have included config.h before including |
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31 // this file. |
| 4378 | 32 |
| 4390 | 33 #include <map> |
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34 #include <fstream> |
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35 #include <iostream> |
| 4389 | 36 #include <string> |
| 37 | |
| 4399 | 38 /* System defines are for non-Unix systems only. (Testing for all Unix |
| 39 variations should be done in configure.) Presently the defines used | |
| 40 are: DOS OS2 WIN32. I do not use any of these systems | |
| 41 myself; if you do, I'd be grateful for any changes. --kb@mail.tug.org */ | |
| 42 | |
| 43 /* If we have either DOS or OS2, we are DOSISH. */ | |
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44 #if defined (DOS) || defined (OS2) || defined (WIN32) || defined (__MSDOS__) |
| 4399 | 45 #define DOSISH |
| 46 #endif | |
| 47 | |
| 48 extern "C" { | |
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49 #if defined (__MINGW32__) |
| 4399 | 50 #include <windows.h> |
| 51 #include <fcntl.h> | |
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52 #elif defined (WIN32) |
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53 #if ! defined (_MSC_VER) |
| 4399 | 54 #define __STDC__ 1 |
| 55 #include "win32lib.h" | |
| 6106 | 56 #endif |
| 4399 | 57 #endif /* not WIN32 */ |
| 58 } | |
| 59 | |
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60 /* System dependencies that are figured out by 'configure'. If we are |
| 4399 | 61 compiling standalone, we get our c-auto.h. Otherwise, the package |
| 62 containing us must provide this (unless it can somehow generate ours | |
| 63 from c-auto.in). We use <...> instead of "..." so that the current | |
| 64 cpp directory (i.e., kpathsea/) won't be searched. */ | |
| 65 | |
| 66 /* If you want to find subdirectories in a directory with non-Unix | |
| 67 semantics (specifically, if a directory with no subdirectories does | |
| 5622 | 68 not have exactly two links), define this. */ |
|
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69 #if ! defined (DOSISH) |
| 4399 | 70 #define ST_NLINK_TRICK |
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71 #endif /* not DOSISH */ |
| 4399 | 72 |
| 11236 | 73 /* Define the characters which separate components of |
| 74 filenames and environment variable paths. */ | |
| 75 | |
| 76 /* What separates filename components? */ | |
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77 #if ! defined (DIR_SEP) |
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78 #if defined (DOSISH) |
| 11236 | 79 /* Either \'s or 's work. Wayne Sullivan's web2pc prefers /, so we'll |
| 80 go with that. */ | |
| 81 #define DIR_SEP '/' | |
| 82 #define DIR_SEP_STRING "/" | |
| 83 #define IS_DEVICE_SEP(ch) ((ch) == ':') | |
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84 #define NAME_BEGINS_WITH_DEVICE(name) ((name.length ()>0) && IS_DEVICE_SEP((name)[1])) |
| 11236 | 85 /* On DOS, it's good to allow both \ and / between directories. */ |
| 86 #define IS_DIR_SEP(ch) ((ch) == '/' || (ch) == '\\') | |
| 87 #else | |
| 88 #define DIR_SEP '/' | |
| 89 #define DIR_SEP_STRING "/" | |
| 90 #endif /* not DOSISH */ | |
| 91 #endif /* not DIR_SEP */ | |
| 92 | |
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93 #if ! defined (IS_DIR_SEP) |
| 11236 | 94 #define IS_DIR_SEP(ch) ((ch) == DIR_SEP) |
| 95 #endif | |
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96 #if ! defined (IS_DEVICE_SEP) |
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97 /* No 'devices' on, e.g., Unix. */ |
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98 #define IS_DEVICE_SEP(ch) 0 |
| 11236 | 99 #endif |
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100 #if ! defined (NAME_BEGINS_WITH_DEVICE) |
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101 #define NAME_BEGINS_WITH_DEVICE(name) 0 |
| 11236 | 102 #endif |
| 4378 | 103 |
| 21865 | 104 #include "file-stat.h" |
| 4396 | 105 #include "lo-error.h" |
| 4391 | 106 #include "oct-env.h" |
| 107 #include "oct-passwd.h" | |
| 4399 | 108 #include "str-vec.h" |
| 4385 | 109 |
| 110 /* Header files that essentially all of our sources need, and | |
| 111 that all implementations have. We include these first, to help with | |
| 112 NULL being defined multiple times. */ | |
| 113 #include <cstdarg> | |
| 114 #include <cstdlib> | |
| 115 #include <cerrno> | |
| 116 #include <cassert> | |
| 117 | |
| 118 #include <sys/types.h> | |
| 119 #include <unistd.h> | |
| 120 | |
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121 #include <dirent.h> |
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122 |
| 4385 | 123 /* define NAME_MAX, the maximum length of a single |
| 124 component in a filename. No such limit may exist, or may vary | |
| 125 depending on the filesystem. */ | |
| 126 | |
| 127 /* Most likely the system will truncate filenames if it is not POSIX, | |
| 128 and so we can use the BSD value here. */ | |
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129 #if ! defined (_POSIX_NAME_MAX) |
| 4385 | 130 #define _POSIX_NAME_MAX 255 |
| 131 #endif | |
| 132 | |
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133 #if ! defined (NAME_MAX) |
| 4385 | 134 #define NAME_MAX _POSIX_NAME_MAX |
| 135 #endif | |
| 136 | |
| 137 #include <cctype> | |
| 138 | |
| 139 /* What separates elements in environment variable path lists? */ | |
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140 #if ! defined (ENV_SEP) |
| 5451 | 141 #if defined (SEPCHAR) && defined (SEPCHAR_STR) |
| 142 #define ENV_SEP SEPCHAR | |
| 143 #define ENV_SEP_STRING SEPCHAR_STR | |
| 144 #elif defined (DOSISH) | |
| 4385 | 145 #define ENV_SEP ';' |
| 146 #define ENV_SEP_STRING ";" | |
| 147 #else | |
| 148 #define ENV_SEP ':' | |
| 149 #define ENV_SEP_STRING ":" | |
| 150 #endif /* not DOS */ | |
| 151 #endif /* not ENV_SEP */ | |
| 152 | |
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153 #if ! defined (IS_ENV_SEP) |
| 4385 | 154 #define IS_ENV_SEP(ch) ((ch) == ENV_SEP) |
| 155 #endif | |
| 156 | |
| 157 /* If NO_DEBUG is defined (not recommended), skip all this. */ | |
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158 #if ! defined (NO_DEBUG) |
| 4385 | 159 |
| 160 /* OK, we'll have tracing support. */ | |
| 161 #define KPSE_DEBUG | |
| 162 | |
| 163 /* Test if a bit is on. */ | |
| 164 #define KPSE_DEBUG_P(bit) (kpathsea_debug & (1 << (bit))) | |
| 165 | |
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166 #define KPSE_DEBUG_STAT 0 /* stat calls */ |
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167 #define KPSE_DEBUG_EXPAND 1 /* path element expansion */ |
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168 #define KPSE_DEBUG_SEARCH 2 /* searches */ |
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169 #define KPSE_DEBUG_VARS 3 /* variable values */ |
| 4385 | 170 #define KPSE_LAST_DEBUG KPSE_DEBUG_VARS |
| 171 | |
| 172 #endif /* not NO_DEBUG */ | |
| 173 | |
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174 #if defined (KPSE_DEBUG) |
| 4399 | 175 static unsigned int kpathsea_debug = 0; |
| 176 #endif | |
| 177 | |
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178 #if defined (WIN32) && ! defined (__MINGW32__) |
| 4385 | 179 |
| 180 /* System description file for Windows NT. */ | |
| 181 | |
| 182 /* | |
| 183 * Define symbols to identify the version of Unix this is. | |
| 184 * Define all the symbols that apply correctly. | |
| 185 */ | |
| 186 | |
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187 #if ! defined (DOSISH) |
| 4385 | 188 #define DOSISH |
| 189 #endif | |
| 190 | |
| 191 /* These have to be defined because our compilers treat __STDC__ as being | |
| 192 defined (most of them anyway). */ | |
| 193 | |
| 194 #define access _access | |
| 195 | |
| 196 /* Define this so that winsock.h definitions don't get included when | |
| 197 windows.h is... For this to have proper effect, config.h must | |
| 4391 | 198 always be included before windows.h. */ |
| 4385 | 199 #define _WINSOCKAPI_ 1 |
| 200 | |
| 201 #include <windows.h> | |
| 202 | |
| 203 /* For proper declaration of environ. */ | |
| 204 #include <io.h> | |
| 205 #include <fcntl.h> | |
| 206 #include <process.h> | |
| 207 | |
| 208 /* ============================================================ */ | |
| 209 | |
| 210 #endif /* WIN32 */ | |
| 211 | |
| 212 /* Define common sorts of messages. */ | |
| 213 | |
| 214 /* This should be called only after a system call fails. Don't exit | |
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215 with status 'errno', because that might be 256, which would mean |
| 4385 | 216 success (exit statuses are truncated to eight bits). */ |
| 4396 | 217 #define FATAL_PERROR(str) \ |
| 218 do \ | |
| 219 { \ | |
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220 std::cerr << "pathsearch: "; \ |
| 4396 | 221 perror (str); exit (EXIT_FAILURE); \ |
| 222 } \ | |
| 223 while (0) | |
| 224 | |
| 225 #define FATAL(str) \ | |
| 226 do \ | |
| 227 { \ | |
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228 std::cerr << "pathsearch: fatal: " << str << "." << std::endl; \ |
| 4396 | 229 exit (1); \ |
| 230 } \ | |
| 231 while (0) | |
| 4385 | 232 |
| 4389 | 233 static std::string kpse_var_expand (const std::string& src); |
| 4385 | 234 |
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235 static std::string kpse_element_dir (const std::string& elt); |
| 4399 | 236 |
| 237 static std::string kpse_expand (const std::string& s); | |
| 238 | |
| 239 static std::string kpse_expand_default (const std::string& path, | |
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240 const std::string& dflt); |
| 4399 | 241 |
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242 #include <ctime> /* for 'time' */ |
| 4385 | 243 |
| 4399 | 244 static bool |
| 4394 | 245 kpse_is_env_sep (char c) |
| 246 { | |
| 247 return IS_ENV_SEP (c); | |
| 248 } | |
| 249 | |
| 4399 | 250 /* A way to step through a path, extracting one directory name at a |
| 251 time. */ | |
| 252 | |
| 253 class kpse_path_iterator | |
| 254 { | |
| 255 public: | |
| 256 | |
| 257 kpse_path_iterator (const std::string& p) | |
| 258 : path (p), b (0), e (0), len (path.length ()) { set_end (); } | |
| 259 | |
| 260 kpse_path_iterator (const kpse_path_iterator& pi) | |
| 261 : path (pi.path), b (pi.b), e (pi.e), len (pi.len) { } | |
| 262 | |
| 263 kpse_path_iterator operator ++ (int) | |
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264 { |
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265 kpse_path_iterator retval (*this); |
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266 next (); |
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267 return retval; |
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268 } |
| 4399 | 269 |
| 270 std::string operator * (void) { return path.substr (b, e-b); } | |
| 271 | |
| 272 bool operator != (const size_t sz) { return b != sz; } | |
| 273 | |
| 274 private: | |
| 275 | |
| 276 const std::string& path; | |
| 277 size_t b; | |
| 278 size_t e; | |
| 279 size_t len; | |
| 280 | |
| 281 void set_end (void) | |
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282 { |
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283 e = b + 1; |
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284 |
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285 if (e == len) |
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286 ; /* OK, we have found the last element. */ |
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287 else if (e > len) |
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288 b = e = std::string::npos; |
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289 else |
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290 { |
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291 /* Find the next colon not enclosed by braces (or the end of |
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292 the path). */ |
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293 while (e < len && ! kpse_is_env_sep (path[e])) |
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294 e++; |
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295 } |
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296 } |
| 4399 | 297 |
| 298 void next (void) | |
|
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299 { |
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300 b = e + 1; |
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301 |
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302 /* Skip any consecutive colons. */ |
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303 while (b < len && kpse_is_env_sep (path[b])) |
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304 b++; |
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305 |
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306 if (b >= len) |
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307 b = e = std::string::npos; |
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308 else |
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309 set_end (); |
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310 } |
| 5617 | 311 |
| 312 // No assignment. | |
| 313 kpse_path_iterator& operator = (const kpse_path_iterator&); | |
| 4399 | 314 }; |
| 315 | |
| 4391 | 316 /* Truncate any too-long components in NAME, returning the result. It's |
| 317 too bad this is necessary. See comments in readable.c for why. */ | |
| 318 | |
| 4393 | 319 static std::string |
| 320 kpse_truncate_filename (const std::string& name) | |
| 4391 | 321 { |
| 322 unsigned c_len = 0; /* Length of current component. */ | |
| 323 unsigned ret_len = 0; /* Length of constructed result. */ | |
| 324 | |
| 4393 | 325 std::string ret = name; |
| 326 | |
| 327 size_t len = name.length (); | |
| 328 | |
| 329 for (size_t i = 0; i < len; i++) | |
| 4391 | 330 { |
| 4393 | 331 if (IS_DIR_SEP (name[i]) || IS_DEVICE_SEP (name[i])) |
| 4391 | 332 { |
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333 /* At a directory delimiter, reset component length. */ |
| 4391 | 334 c_len = 0; |
| 335 } | |
| 336 else if (c_len > NAME_MAX) | |
| 337 { | |
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338 /* If past the max for a component, ignore this character. */ |
| 4391 | 339 continue; |
| 340 } | |
| 341 | |
| 342 /* Copy this character. */ | |
| 4393 | 343 ret[ret_len++] = name[i]; |
| 4391 | 344 c_len++; |
| 345 } | |
| 346 | |
| 4393 | 347 ret.resize (ret_len); |
| 4391 | 348 |
| 349 return ret; | |
| 350 } | |
| 351 | |
| 352 /* If access can read FN, run stat (assigning to stat buffer ST) and | |
| 353 check that fn is not a directory. Don't check for just being a | |
| 354 regular file, as it is potentially useful to read fifo's or some | |
| 355 kinds of devices. */ | |
| 356 | |
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357 #if defined (WIN32) |
| 4391 | 358 static inline bool |
| 21865 | 359 READABLE (const std::string& fn) |
| 4391 | 360 { |
| 4393 | 361 const char *t = fn.c_str (); |
| 362 return (GetFileAttributes (t) != 0xFFFFFFFF | |
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363 && ! (GetFileAttributes (t) & FILE_ATTRIBUTE_DIRECTORY)); |
| 4391 | 364 } |
| 365 #else | |
| 366 static inline bool | |
| 21865 | 367 READABLE (const std::string& fn) |
| 4391 | 368 { |
| 21865 | 369 bool retval = false; |
| 370 | |
| 4393 | 371 const char *t = fn.c_str (); |
| 21865 | 372 |
| 373 if (access (t, R_OK) == 0) | |
| 374 { | |
| 375 octave::sys::file_stat fs (fn); | |
| 376 | |
| 377 retval = fs && ! fs.is_dir (); | |
| 378 } | |
| 379 | |
| 380 return retval; | |
| 4391 | 381 } |
| 382 #endif | |
| 383 | |
| 384 /* POSIX invented the brain-damage of not necessarily truncating | |
| 385 filename components; the system's behavior is defined by the value of | |
| 386 the symbol _POSIX_NO_TRUNC, but you can't change it dynamically! | |
| 387 | |
| 388 Generic const return warning. See extend-fname.c. */ | |
| 389 | |
| 4393 | 390 static std::string |
| 391 kpse_readable_file (const std::string& name) | |
| 4391 | 392 { |
| 4393 | 393 std::string ret; |
| 4391 | 394 |
| 21865 | 395 if (READABLE (name)) |
| 4391 | 396 { |
| 4393 | 397 ret = name; |
| 4391 | 398 |
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399 #if defined (ENAMETOOLONG) |
| 4391 | 400 } |
| 401 else if (errno == ENAMETOOLONG) | |
| 402 { | |
| 403 ret = kpse_truncate_filename (name); | |
| 404 | |
| 405 /* Perhaps some other error will occur with the truncated name, | |
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406 so let's call access again. */ |
| 4391 | 407 |
| 21865 | 408 if (! READABLE (ret)) |
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409 { |
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410 /* Failed. */ |
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411 ret = ""; |
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412 } |
| 4391 | 413 #endif /* ENAMETOOLONG */ |
| 414 | |
| 415 } | |
| 416 else | |
| 417 { | |
| 418 /* Some other error. */ | |
| 419 if (errno == EACCES) | |
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420 { |
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421 /* Maybe warn them if permissions are bad. */ |
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422 perror (name.c_str ()); |
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423 } |
| 4393 | 424 |
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425 ret = ""; |
| 4391 | 426 } |
| 427 | |
| 428 return ret; | |
| 429 } | |
| 430 | |
| 431 static bool | |
| 432 kpse_absolute_p (const std::string& filename, int relative_ok) | |
| 433 { | |
| 21865 | 434 return (octave::sys::env::absolute_pathname (filename) |
| 435 || (relative_ok | |
| 436 && octave::sys::env::rooted_relative_pathname (filename))); | |
| 4391 | 437 } |
| 438 | |
| 4378 | 439 /* The very first search is for texmf.cnf, called when someone tries to |
| 440 initialize the TFM path or whatever. init_path calls kpse_cnf_get | |
| 441 which calls kpse_all_path_search to find all the texmf.cnf's. We | |
| 442 need to do various special things in this case, since we obviously | |
| 443 don't yet have the configuration files when we're searching for the | |
| 444 configuration files. */ | |
| 445 static bool first_search = true; | |
| 446 | |
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447 /* This function is called after every search. */ |
| 4378 | 448 |
| 449 static void | |
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450 log_search (const std::list<std::string>& filenames) |
| 4378 | 451 { |
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452 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) |
| 4391 | 453 { |
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454 for (const auto &filename : filenames) |
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455 std::cerr << time (0) << " " << filename << std::endl; |
| 4378 | 456 } |
| 457 } | |
| 4392 | 458 |
| 4378 | 459 /* Concatenate each element in DIRS with NAME (assume each ends with a |
| 460 /, to save time). If SEARCH_ALL is false, return the first readable | |
| 461 regular file. Else continue to search for more. In any case, if | |
| 462 none, return a list containing just NULL. | |
| 463 | |
| 464 We keep a single buffer for the potential filenames and reallocate | |
| 465 only when necessary. I'm not sure it's noticeably faster, but it | |
| 466 does seem cleaner. (We do waste a bit of space in the return | |
| 467 value, though, since we don't shrink it to the final size returned.) */ | |
| 468 | |
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469 static std::list<std::string> |
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470 dir_search (const std::string& dir, const std::string& name, |
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471 bool search_all) |
| 4378 | 472 { |
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473 std::list<std::string> ret; |
| 4378 | 474 |
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475 std::string potential = dir + name; |
| 4393 | 476 |
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477 std::string tmp = kpse_readable_file (potential); |
| 4393 | 478 |
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479 if (! tmp.empty ()) |
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480 { |
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481 ret.push_back (potential); |
| 4391 | 482 |
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483 if (! search_all) |
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484 return ret; |
| 4378 | 485 } |
| 4391 | 486 |
| 4378 | 487 return ret; |
| 488 } | |
| 4392 | 489 |
| 4378 | 490 /* This is called when NAME is absolute or explicitly relative; if it's |
| 491 readable, return (a list containing) it; otherwise, return NULL. */ | |
| 492 | |
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493 static std::list<std::string> |
| 4393 | 494 absolute_search (const std::string& name) |
| 4378 | 495 { |
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496 std::list<std::string> ret_list; |
| 4393 | 497 std::string found = kpse_readable_file (name); |
| 4391 | 498 |
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499 /* Add 'found' to the return list even if it's null; that tells |
| 4378 | 500 the caller we didn't find anything. */ |
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501 ret_list.push_back (found); |
| 4391 | 502 |
| 4378 | 503 return ret_list; |
| 504 } | |
| 4392 | 505 |
| 4378 | 506 /* This is the hard case -- look for NAME in PATH. If ALL is false, |
| 507 return the first file found. Otherwise, search all elements of PATH. */ | |
| 508 | |
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509 static std::list<std::string> |
| 4394 | 510 path_search (const std::string& path, const std::string& name, |
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511 bool /* must_exist */, bool all) |
| 4378 | 512 { |
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513 std::list<std::string> ret_list; |
| 4378 | 514 bool done = false; |
| 4390 | 515 |
| 8021 | 516 for (kpse_path_iterator pi (path); ! done && pi != std::string::npos; pi++) |
| 4390 | 517 { |
| 4394 | 518 std::string elt = *pi; |
| 519 | |
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520 std::list<std::string> found; |
| 4390 | 521 |
| 522 /* Do not touch the device if present */ | |
| 523 if (NAME_BEGINS_WITH_DEVICE (elt)) | |
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524 { |
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525 while (elt.length () > 3 |
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526 && IS_DIR_SEP (elt[2]) && IS_DIR_SEP (elt[3])) |
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527 { |
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528 elt[2] = elt[1]; |
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529 elt[1] = elt[0]; |
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530 elt = elt.substr (1); |
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531 } |
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532 } |
| 4390 | 533 else |
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534 { |
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535 /* We never want to search the whole disk. */ |
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536 while (elt.length () > 1 |
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537 && IS_DIR_SEP (elt[0]) && IS_DIR_SEP (elt[1])) |
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538 elt = elt.substr (1); |
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539 } |
| 4391 | 540 |
| 21872 | 541 /* Our caller (search), also tests first_search, and does |
| 542 the resetting. */ | |
| 21865 | 543 if (first_search) |
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544 found = std::list<std::string> (); |
| 21865 | 545 |
| 546 /* Search the filesystem. */ | |
| 547 | |
| 548 if (found.empty ()) | |
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549 { |
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550 std::string dir = kpse_element_dir (elt); |
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551 |
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552 if (! dir.empty ()) |
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553 found = dir_search (dir, name, all); |
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554 } |
| 4390 | 555 |
| 556 /* Did we find anything anywhere? */ | |
| 557 if (! found.empty ()) | |
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558 { |
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559 if (all) |
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560 ret_list.splice (ret_list.end (), found); |
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561 else |
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562 { |
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563 ret_list.push_back (found.front ()); |
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564 done = true; |
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565 } |
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566 } |
| 4378 | 567 } |
| 568 | |
| 569 return ret_list; | |
| 4390 | 570 } |
| 4392 | 571 |
| 4378 | 572 /* Search PATH for ORIGINAL_NAME. If ALL is false, or ORIGINAL_NAME is |
| 573 absolute_p, check ORIGINAL_NAME itself. Otherwise, look at each | |
| 574 element of PATH for the first readable ORIGINAL_NAME. | |
| 4391 | 575 |
| 4378 | 576 Always return a list; if no files are found, the list will |
| 577 contain just NULL. If ALL is true, the list will be | |
| 578 terminated with NULL. */ | |
| 579 | |
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580 static std::list<std::string> |
| 4390 | 581 search (const std::string& path, const std::string& original_name, |
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582 bool must_exist, bool all) |
| 4378 | 583 { |
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584 std::list<std::string> ret_list; |
| 4378 | 585 bool absolute_p; |
| 586 | |
| 587 /* Make a leading ~ count as an absolute filename, and expand $FOO's. */ | |
| 4390 | 588 std::string name = kpse_expand (original_name); |
| 4391 | 589 |
| 4378 | 590 /* If the first name is absolute or explicitly relative, no need to |
| 591 consider PATH at all. */ | |
| 592 absolute_p = kpse_absolute_p (name, true); | |
| 4391 | 593 |
| 4378 | 594 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) |
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595 std::cerr << "kdebug: start search (file=" << name |
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596 << ", must_exist=" << must_exist |
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597 << ", find_all=" << all << ", path=" << path << ")." |
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598 << std::endl; |
| 4378 | 599 |
| 600 /* Find the file(s). */ | |
| 601 ret_list = absolute_p ? absolute_search (name) | |
| 602 : path_search (path, name, must_exist, all); | |
| 4391 | 603 |
| 4378 | 604 /* The very first search is for texmf.cnf. We can't log that, since |
| 605 we want to allow setting TEXMFLOG in texmf.cnf. */ | |
| 4391 | 606 if (first_search) |
| 607 { | |
| 608 first_search = false; | |
| 609 } | |
| 610 else | |
| 611 { | |
| 612 /* Record the filenames we found, if desired. And wrap them in a | |
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613 debugging line if we're doing that. */ |
| 4391 | 614 |
| 615 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) | |
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616 std::cerr << "kdebug: search (" << original_name << ") =>"; |
| 4391 | 617 |
| 618 log_search (ret_list); | |
| 619 | |
| 620 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) | |
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621 std::cerr << std::endl; |
| 4391 | 622 } |
| 4378 | 623 |
| 4390 | 624 return ret_list; |
| 4378 | 625 } |
| 4392 | 626 |
| 4378 | 627 /* Search PATH for the first NAME. */ |
| 628 | |
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629 /* Call 'kpse_expand' on NAME. If the result is an absolute or |
| 4399 | 630 explicitly relative filename, check whether it is a readable |
| 631 (regular) file. | |
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632 |
| 4399 | 633 Otherwise, look in each of the directories specified in PATH (also do |
| 21865 | 634 tilde and variable expansion on elements in PATH). |
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635 |
|
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636 The caller must expand PATH. This is because it makes more sense to |
| 4399 | 637 do this once, in advance, instead of for every search using it. |
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638 |
| 4399 | 639 In any case, return the complete filename if found, otherwise NULL. */ |
| 640 | |
| 641 static std::string | |
| 4390 | 642 kpse_path_search (const std::string& path, const std::string& name, |
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643 bool must_exist) |
| 4378 | 644 { |
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645 std::list<std::string> ret_list = search (path, name, must_exist, false); |
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646 |
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647 return ret_list.empty () ? "" : ret_list.front (); |
| 4378 | 648 } |
| 649 | |
| 650 /* Search all elements of PATH for files named NAME. Not sure if it's | |
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651 right to assert 'must_exist' here, but it suffices now. */ |
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652 |
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653 /* Like 'kpse_path_search' with MUST_EXIST true, but return a list of |
| 4399 | 654 all the filenames (or NULL if none), instead of taking the first. */ |
| 655 | |
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656 static std::list<std::string> |
| 4390 | 657 kpse_all_path_search (const std::string& path, const std::string& name) |
| 4378 | 658 { |
| 4390 | 659 return search (path, name, true, true); |
| 4378 | 660 } |
| 4392 | 661 |
| 4378 | 662 /* This is the hard case -- look in each element of PATH for each |
| 663 element of NAMES. If ALL is false, return the first file found. | |
| 664 Otherwise, search all elements of PATH. */ | |
| 665 | |
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666 static std::list<std::string> |
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667 path_find_first_of (const std::string& path, |
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668 const std::list<std::string>& names, |
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669 bool /* must_exist */, bool all) |
| 4378 | 670 { |
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671 std::list<std::string> ret_list; |
| 4378 | 672 bool done = false; |
| 4390 | 673 |
| 8021 | 674 for (kpse_path_iterator pi (path); ! done && pi != std::string::npos; pi++) |
| 4378 | 675 { |
| 4394 | 676 std::string elt = *pi; |
| 677 | |
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678 std::string dir; |
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679 std::list<std::string> found; |
| 4378 | 680 |
| 681 /* Do not touch the device if present */ | |
| 682 | |
| 683 if (NAME_BEGINS_WITH_DEVICE (elt)) | |
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684 { |
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685 while (elt.length () > 3 |
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686 && IS_DIR_SEP (elt[2]) && IS_DIR_SEP (elt[3])) |
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687 { |
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688 elt[2] = elt[1]; |
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689 elt[1] = elt[0]; |
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690 elt = elt.substr (1); |
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691 } |
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692 } |
| 4378 | 693 else |
|
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694 { |
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695 /* We never want to search the whole disk. */ |
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696 while (elt.length () > 1 |
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697 && IS_DIR_SEP (elt[0]) && IS_DIR_SEP (elt[1])) |
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698 elt = elt.substr (1); |
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699 } |
| 4378 | 700 |
| 701 /* We have to search one directory at a time. */ | |
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702 dir = kpse_element_dir (elt); |
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703 |
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704 if (! dir.empty ()) |
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705 { |
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706 for (auto it = names.cbegin (); it != names.cend () && ! done; it++) |
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707 { |
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708 std::string name = *it; |
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709 |
| 21872 | 710 /* Our caller (find_first_of), also tests first_search, |
| 711 and does the resetting. */ | |
| 21865 | 712 if (first_search) |
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713 found = std::list<std::string> (); |
| 21865 | 714 |
| 715 /* Search the filesystem. */ | |
| 716 | |
| 717 if (found.empty ()) | |
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718 found = dir_search (dir, name, all); |
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719 |
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720 /* Did we find anything anywhere? */ |
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721 if (! found.empty ()) |
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722 { |
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723 if (all) |
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724 ret_list.splice (ret_list.end (), found); |
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725 else |
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726 { |
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727 ret_list.push_back (found.front ()); |
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728 done = true; |
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729 } |
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730 } |
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731 } |
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732 } |
| 4378 | 733 } |
| 734 | |
| 735 return ret_list; | |
| 4391 | 736 } |
| 4378 | 737 |
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738 static std::list<std::string> |
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739 find_first_of (const std::string& path, const std::list<std::string>& names, |
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740 bool must_exist, bool all) |
| 4378 | 741 { |
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742 std::list<std::string> ret_list; |
| 4378 | 743 |
| 744 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) | |
| 745 { | |
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746 std::cerr << "kdebug: start find_first_of (("; |
| 4391 | 747 |
|
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748 for (auto p = names.cbegin (); p != names.cend (); p++) |
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749 { |
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750 if (p == names.cbegin ()) |
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751 std::cerr << *p; |
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752 else |
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753 std::cerr << ", " << *p; |
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754 } |
| 4391 | 755 |
|
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756 std::cerr << "), path=" << path << ", must_exist=" |
|
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757 << must_exist << "." << std::endl; |
| 4378 | 758 } |
| 759 | |
|
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760 for (const auto &name : names) |
| 4409 | 761 { |
| 762 if (kpse_absolute_p (name, true)) | |
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763 { |
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764 /* If the name is absolute or explicitly relative, no need |
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765 to consider PATH at all. If we find something, then we |
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766 are done. */ |
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767 |
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768 ret_list = absolute_search (name); |
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769 |
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770 if (! ret_list.empty ()) |
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771 return ret_list; |
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772 } |
| 4409 | 773 } |
| 774 | |
| 4378 | 775 /* Find the file. */ |
| 776 ret_list = path_find_first_of (path, names, must_exist, all); | |
| 777 | |
| 778 /* The very first search is for texmf.cnf. We can't log that, since | |
| 779 we want to allow setting TEXMFLOG in texmf.cnf. */ | |
| 4391 | 780 if (first_search) |
| 781 { | |
| 782 first_search = false; | |
| 783 } | |
| 784 else | |
| 785 { | |
| 786 /* Record the filenames we found, if desired. And wrap them in a | |
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787 debugging line if we're doing that. */ |
| 4391 | 788 |
| 789 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) | |
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790 { |
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791 std::cerr << "kdebug: find_first_of ("; |
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792 |
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793 for (auto p = names.cbegin (); p != names.cend (); p++) |
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794 { |
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795 if (p == names.cbegin ()) |
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796 std:: cerr << *p; |
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797 else |
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798 std::cerr << ", " << *p; |
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799 } |
| 10411 | 800 |
|
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801 std::cerr << ") =>"; |
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802 } |
| 4391 | 803 |
| 804 log_search (ret_list); | |
| 805 | |
| 806 if (KPSE_DEBUG_P (KPSE_DEBUG_SEARCH)) | |
| 10411 | 807 gnulib::putc ('\n', stderr); |
| 4391 | 808 } |
| 4378 | 809 |
| 4390 | 810 return ret_list; |
| 4378 | 811 } |
| 812 | |
| 813 /* Search each element of PATH for each element of NAMES. Return the | |
| 814 first one found. */ | |
| 815 | |
| 4399 | 816 /* Search each element of PATH for each element in the list of NAMES. |
| 817 Return the first one found. */ | |
| 818 | |
| 819 static std::string | |
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820 kpse_path_find_first_of (const std::string& path, |
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821 const std::list<std::string>& names, |
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822 bool must_exist) |
| 4378 | 823 { |
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824 std::list<std::string> ret_list |
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825 = find_first_of (path, names, must_exist, false); |
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826 |
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827 return ret_list.empty () ? "" : ret_list.front (); |
| 4378 | 828 } |
| 829 | |
| 830 /* Search each element of PATH for each element of NAMES and return a | |
| 831 list containing everything found, in the order found. */ | |
| 832 | |
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833 /* Like 'kpse_path_find_first_of' with MUST_EXIST true, but return a |
| 4399 | 834 list of all the filenames (or NULL if none), instead of taking the |
| 835 first. */ | |
| 836 | |
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837 static std::list<std::string> |
| 4390 | 838 kpse_all_path_find_first_of (const std::string& path, |
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839 const std::list<std::string>& names) |
| 4378 | 840 { |
| 4390 | 841 return find_first_of (path, names, true, true); |
| 4378 | 842 } |
| 843 | |
| 4399 | 844 /* General expansion. Some of this file (the brace-expansion |
| 4378 | 845 code from bash) is covered by the GPL; this is the only GPL-covered |
| 846 code in kpathsea. The part of the file that I wrote (the first | |
| 847 couple of functions) is covered by the LGPL. */ | |
| 848 | |
| 849 /* If NAME has a leading ~ or ~user, Unix-style, expand it to the user's | |
| 850 home directory, and return a new malloced string. If no ~, or no | |
| 851 <pwd.h>, just return NAME. */ | |
| 852 | |
| 4389 | 853 static std::string |
| 854 kpse_tilde_expand (const std::string& name) | |
| 4378 | 855 { |
| 4389 | 856 std::string expansion; |
| 4391 | 857 |
| 4378 | 858 /* If no leading tilde, do nothing. */ |
| 5137 | 859 if (name.empty () || name[0] != '~') |
| 4391 | 860 { |
| 861 expansion = name; | |
| 862 | |
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863 /* If a bare tilde, return the home directory or '.'. (Very |
|
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864 unlikely that the directory name will do anyone any good, but |
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865 ... */ |
| 4391 | 866 } |
| 867 else if (name.length () == 1) | |
| 868 { | |
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869 expansion = octave::sys::env::get_home_directory (); |
| 4391 | 870 |
| 871 if (expansion.empty ()) | |
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872 expansion = "."; |
| 4391 | 873 |
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874 /* If '~/', remove any trailing / or replace leading // in $HOME. |
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875 Should really check for doubled intermediate slashes, too. */ |
| 4378 | 876 } |
| 4391 | 877 else if (IS_DIR_SEP (name[1])) |
| 878 { | |
| 879 unsigned c = 1; | |
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880 std::string home = octave::sys::env::get_home_directory (); |
| 4391 | 881 |
| 882 if (home.empty ()) | |
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883 home = "."; |
| 4391 | 884 |
| 885 size_t home_len = home.length (); | |
| 886 | |
| 887 /* handle leading // */ | |
| 888 if (home_len > 1 && IS_DIR_SEP (home[0]) && IS_DIR_SEP (home[1])) | |
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889 home = home.substr (1); |
| 4391 | 890 |
| 891 /* omit / after ~ */ | |
| 892 if (IS_DIR_SEP (home[home_len - 1])) | |
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893 c++; |
| 4391 | 894 |
| 895 expansion = home + name.substr (c); | |
| 896 | |
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897 /* If '~user' or '~user/', look up user in the passwd database (but |
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898 OS/2 doesn't have this concept. */ |
| 4378 | 899 } |
| 4391 | 900 else |
|
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901 #if defined (HAVE_PWD_H) |
| 4378 | 902 { |
| 903 unsigned c = 2; | |
| 4391 | 904 |
| 905 /* find user name */ | |
| 906 while (name.length () > c && ! IS_DIR_SEP (name[c])) | |
| 4378 | 907 c++; |
| 4391 | 908 |
| 909 std::string user = name.substr (1, c-1); | |
| 910 | |
| 4378 | 911 /* We only need the cast here for (deficient) systems |
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912 which do not declare 'getpwnam' in <pwd.h>. */ |
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913 octave::sys::password p = octave::sys::password::getpwnam (user); |
| 4378 | 914 |
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915 /* If no such user, just use '.'. */ |
| 4391 | 916 std::string home = p ? p.dir () : std::string ("."); |
| 917 | |
| 918 if (home.empty ()) | |
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919 home = "."; |
| 4391 | 920 |
| 921 /* handle leading // */ | |
| 922 if (home.length () > 1 && IS_DIR_SEP (home[0]) && IS_DIR_SEP (home[1])) | |
| 923 home = home.substr (1); | |
| 924 | |
| 925 /* If HOME ends in /, omit the / after ~user. */ | |
| 926 if (name.length () > c && IS_DIR_SEP (home[home.length () - 1])) | |
| 927 c++; | |
| 928 | |
| 929 expansion = name.length () > c ? home : home + name.substr (c); | |
| 4378 | 930 } |
| 931 #else /* not HAVE_PWD_H */ | |
| 4391 | 932 expansion = name; |
| 4378 | 933 #endif /* not HAVE_PWD_H */ |
| 934 | |
| 4389 | 935 return expansion; |
| 4378 | 936 } |
| 937 | |
| 938 /* Do variable expansion first so ~${USER} works. (Besides, it's what the | |
| 939 shells do.) */ | |
| 940 | |
| 4399 | 941 /* Call kpse_var_expand and kpse_tilde_expand (in that order). Result |
| 942 is always in fresh memory, even if no expansions were done. */ | |
| 943 | |
| 944 static std::string | |
| 4389 | 945 kpse_expand (const std::string& s) |
| 4378 | 946 { |
| 4389 | 947 std::string var_expansion = kpse_var_expand (s); |
| 948 return kpse_tilde_expand (var_expansion); | |
| 4378 | 949 } |
| 950 | |
| 951 /* Forward declarations of functions from the original expand.c */ | |
|
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952 static std::list<std::string> brace_expand (const std::string&); |
| 4378 | 953 |
| 954 /* If $KPSE_DOT is defined in the environment, prepend it to any relative | |
| 955 path components. */ | |
| 956 | |
| 4389 | 957 static std::string |
| 958 kpse_expand_kpse_dot (const std::string& path) | |
| 4378 | 959 { |
| 4389 | 960 std::string ret; |
|
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961 std::string kpse_dot = octave::sys::env::getenv ("KPSE_DOT"); |
| 4391 | 962 |
| 963 if (kpse_dot.empty ()) | |
| 4378 | 964 return path; |
| 965 | |
| 8021 | 966 for (kpse_path_iterator pi (path); pi != std::string::npos; pi++) |
| 4391 | 967 { |
| 4394 | 968 std::string elt = *pi; |
| 969 | |
| 21872 | 970 /* Single "." get special treatment, as does "./" or its equivalent. */ |
| 4391 | 971 |
| 4394 | 972 size_t elt_len = elt.length (); |
| 973 | |
| 21872 | 974 if (kpse_absolute_p (elt, false)) |
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975 ret += elt + ENV_SEP_STRING; |
| 4394 | 976 else if (elt_len == 1 && elt[0] == '.') |
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977 ret += kpse_dot + ENV_SEP_STRING; |
| 4394 | 978 else if (elt_len > 1 && elt[0] == '.' && IS_DIR_SEP (elt[1])) |
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979 ret += kpse_dot + elt.substr (1) + ENV_SEP_STRING; |
| 4391 | 980 else |
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981 ret += kpse_dot + DIR_SEP_STRING + elt + ENV_SEP_STRING; |
| 4378 | 982 } |
| 983 | |
| 4389 | 984 int len = ret.length (); |
| 985 if (len > 0) | |
| 4395 | 986 ret.resize (len-1); |
| 4389 | 987 |
| 4378 | 988 return ret; |
| 989 } | |
| 990 | |
| 991 /* Do brace expansion on ELT; then do variable and ~ expansion on each | |
| 992 element of the result; then do brace expansion again, in case a | |
| 993 variable definition contained braces (e.g., $TEXMF). Return a | |
| 994 string comprising all of the results separated by ENV_SEP_STRING. */ | |
| 995 | |
| 4389 | 996 static std::string |
| 4394 | 997 kpse_brace_expand_element (const std::string& elt) |
| 4378 | 998 { |
| 4389 | 999 std::string ret; |
| 4378 | 1000 |
|
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1001 std::list<std::string> expansions = brace_expand (elt); |
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1002 |
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1003 for (const auto &expanded_elt : expansions) |
| 4391 | 1004 { |
| 1005 /* Do $ and ~ expansion on each element. */ | |
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1006 std::string x = kpse_expand (expanded_elt); |
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1007 |
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1008 if (x != elt) |
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1009 { |
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1010 /* If we did any expansions, do brace expansion again. Since |
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1011 recursive variable definitions are not allowed, this recursion |
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1012 must terminate. (In practice, it's unlikely there will ever be |
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1013 more than one level of recursion.) */ |
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1014 x = kpse_brace_expand_element (x); |
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1015 } |
| 4391 | 1016 |
| 1017 ret += x + ENV_SEP_STRING; | |
| 4378 | 1018 } |
| 1019 | |
| 4389 | 1020 ret.resize (ret.length () - 1); |
| 4391 | 1021 |
| 4378 | 1022 return ret; |
| 1023 } | |
| 1024 | |
|
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1025 /* Do brace expansion and call 'kpse_expand' on each element of the |
| 4399 | 1026 result; return the final expansion (always in fresh memory, even if |
|
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1027 no expansions were done). We don't call 'kpse_expand_default' |
| 4399 | 1028 because there is a whole sequence of defaults to run through; see |
|
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1029 'kpse_init_format'. */ |
| 4399 | 1030 |
| 1031 static std::string | |
| 4397 | 1032 kpse_brace_expand (const std::string& path) |
| 4378 | 1033 { |
| 1034 /* Must do variable expansion first because if we have | |
| 1035 foo = .:~ | |
| 1036 TEXINPUTS = $foo | |
| 1037 we want to end up with TEXINPUTS = .:/home/karl. | |
| 1038 Since kpse_path_element is not reentrant, we must get all | |
| 1039 the path elements before we start the loop. */ | |
| 4389 | 1040 std::string tmp = kpse_var_expand (path); |
| 4394 | 1041 |
| 4389 | 1042 std::string ret; |
| 4378 | 1043 |
| 8021 | 1044 for (kpse_path_iterator pi (tmp); pi != std::string::npos; pi++) |
| 4391 | 1045 { |
| 4394 | 1046 std::string elt = *pi; |
| 1047 | |
| 4391 | 1048 /* Do brace expansion first, so tilde expansion happens in {~ka,~kb}. */ |
| 1049 std::string expansion = kpse_brace_expand_element (elt); | |
| 1050 ret += expansion + ENV_SEP_STRING; | |
| 1051 } | |
| 4378 | 1052 |
| 4394 | 1053 size_t len = ret.length (); |
| 4389 | 1054 if (len > 0) |
| 4395 | 1055 ret.resize (len-1); |
| 4389 | 1056 |
| 1057 return kpse_expand_kpse_dot (ret); | |
| 4378 | 1058 } |
| 4392 | 1059 |
| 4378 | 1060 /* Expand all special constructs in a path, and include only the actually |
| 1061 existing directories in the result. */ | |
| 4399 | 1062 |
|
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1063 /* Do brace expansion and call 'kpse_expand' on each argument of the |
|
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1064 result. The final expansion (always in fresh memory) is a path of |
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1065 all the existing directories that match the pattern. */ |
| 4399 | 1066 |
| 1067 static std::string | |
| 4397 | 1068 kpse_path_expand (const std::string& path) |
| 4378 | 1069 { |
| 4392 | 1070 std::string ret; |
| 4378 | 1071 unsigned len; |
| 1072 | |
| 1073 len = 0; | |
| 4391 | 1074 |
| 4378 | 1075 /* Expand variables and braces first. */ |
| 4389 | 1076 std::string tmp = kpse_brace_expand (path); |
| 4392 | 1077 |
| 4378 | 1078 /* Now expand each of the path elements, printing the results */ |
| 8021 | 1079 for (kpse_path_iterator pi (tmp); pi != std::string::npos; pi++) |
| 4391 | 1080 { |
| 4394 | 1081 std::string elt = *pi; |
| 1082 | |
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1083 std::string dir; |
| 4391 | 1084 |
| 1085 /* Do not touch the device if present */ | |
| 1086 if (NAME_BEGINS_WITH_DEVICE (elt)) | |
|
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1087 { |
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1088 while (elt.length () > 3 |
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1089 && IS_DIR_SEP (elt[2]) && IS_DIR_SEP (elt[3])) |
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1090 { |
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1091 elt[2] = elt[1]; |
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1092 elt[1] = elt[0]; |
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1093 elt = elt.substr (1); |
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1094 } |
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1095 } |
| 4391 | 1096 else |
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1097 { |
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1098 /* We never want to search the whole disk. */ |
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1099 while (elt.length () > 1 |
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1100 && IS_DIR_SEP (elt[0]) && IS_DIR_SEP (elt[1])) |
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1101 elt = elt.substr (1); |
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1102 } |
| 4378 | 1103 |
| 4394 | 1104 /* Search the disk for all dirs in the component specified. |
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1105 Be faster to check the database, but this is more reliable. */ |
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1106 dir = kpse_element_dir (elt); |
| 4394 | 1107 |
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1108 size_t dirlen = dir.length (); |
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1109 |
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1110 if (dirlen > 0) |
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1111 { |
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1112 ret += dir; |
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1113 len += dirlen; |
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1114 |
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1115 /* Retain trailing slash if that's the root directory. */ |
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1116 if (dirlen == 1 |
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1117 || (dirlen == 3 && NAME_BEGINS_WITH_DEVICE (dir) |
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1118 && IS_DIR_SEP (dir[2]))) |
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1119 { |
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1120 ret += ENV_SEP_STRING; |
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1121 len++; |
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1122 } |
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1123 |
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1124 ret[len-1] = ENV_SEP; |
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1125 } |
| 4378 | 1126 } |
| 4391 | 1127 |
| 4395 | 1128 if (len > 0) |
| 1129 ret.resize (len-1); | |
| 4391 | 1130 |
| 4378 | 1131 return ret; |
| 1132 } | |
| 4392 | 1133 |
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1134 /* braces.c -- code for doing word expansion in curly braces. Taken from |
| 16768 | 1135 bash 1.14.5. [And subsequently modified for kpatshea.] |
| 1136 | |
| 1137 Copyright (C) 1987,1991 Free Software Foundation, Inc. */ | |
| 4378 | 1138 |
| 4391 | 1139 #define brace_whitespace(c) (! (c) || (c) == ' ' || (c) == '\t' || (c) == '\n') |
| 4378 | 1140 |
| 1141 /* Basic idea: | |
| 1142 | |
| 1143 Segregate the text into 3 sections: preamble (stuff before an open brace), | |
| 1144 postamble (stuff after the matching close brace) and amble (stuff after | |
| 1145 preamble, and before postamble). Expand amble, and then tack on the | |
| 1146 expansions to preamble. Expand postamble, and tack on the expansions to | |
| 4391 | 1147 the result so far. */ |
| 4378 | 1148 |
| 4397 | 1149 /* Return a new array of strings which is the result of appending each |
| 1150 string in ARR2 to each string in ARR1. The resultant array is | |
| 1151 len (arr1) * len (arr2) long. For convenience, ARR1 (and its contents) | |
| 1152 are free ()'ed. ARR1 can be NULL, in that case, a new version of ARR2 | |
| 1153 is returned. */ | |
| 1154 | |
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1155 static std::list<std::string> |
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1156 array_concat (const std::list<std::string>& arr1, |
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1157 const std::list<std::string>& arr2) |
| 4378 | 1158 { |
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1159 std::list<std::string> result; |
| 4397 | 1160 |
| 1161 if (arr1.empty ()) | |
| 1162 result = arr2; | |
| 1163 else if (arr2.empty ()) | |
| 1164 result = arr1; | |
| 1165 else | |
| 1166 { | |
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1167 for (const auto &elt_2 : arr2) |
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1168 for (const auto &elt_1 : arr1) |
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1169 result.push_back (elt_1 + elt_2); |
| 4397 | 1170 } |
| 1171 | |
| 1172 return result; | |
| 4378 | 1173 } |
| 1174 | |
| 4397 | 1175 static int brace_gobbler (const std::string&, int&, int); |
|
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1176 static std::list<std::string> expand_amble (const std::string&); |
| 4378 | 1177 |
| 1178 /* Return an array of strings; the brace expansion of TEXT. */ | |
|
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1179 static std::list<std::string> |
| 4397 | 1180 brace_expand (const std::string& text) |
| 4378 | 1181 { |
| 1182 /* Find the text of the preamble. */ | |
| 4397 | 1183 int i = 0; |
| 1184 int c = brace_gobbler (text, i, '{'); | |
| 1185 | |
| 1186 std::string preamble = text.substr (0, i); | |
| 1187 | |
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1188 std::list<std::string> result (1, preamble); |
| 4397 | 1189 |
| 1190 if (c == '{') | |
| 4378 | 1191 { |
| 4397 | 1192 /* Find the amble. This is the stuff inside this set of braces. */ |
| 1193 int start = ++i; | |
| 1194 c = brace_gobbler (text, i, '}'); | |
| 1195 | |
| 1196 /* What if there isn't a matching close brace? */ | |
| 1197 if (! c) | |
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1198 { |
|
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1199 (*current_liboctave_warning_with_id_handler) |
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1200 ("Octave:pathsearch-syntax", |
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1201 "%s: Unmatched {", text.c_str ()); |
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1202 |
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1203 result = std::list<std::string> (1, text); |
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1204 } |
| 4397 | 1205 else |
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1206 { |
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1207 std::string amble = text.substr (start, i-start); |
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1208 result = array_concat (result, expand_amble (amble)); |
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1209 |
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1210 std::string postamble = text.substr (i+1); |
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1211 result = array_concat (result, brace_expand (postamble)); |
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1212 } |
| 4378 | 1213 } |
| 1214 | |
| 4397 | 1215 return result; |
| 4378 | 1216 } |
| 1217 | |
| 4397 | 1218 /* The character which is used to separate arguments. */ |
| 1219 static int brace_arg_separator = ','; | |
| 1220 | |
| 4378 | 1221 /* Expand the text found inside of braces. We simply try to split the |
| 1222 text at BRACE_ARG_SEPARATORs into separate strings. We then brace | |
| 1223 expand each slot which needs it, until there are no more slots which | |
| 1224 need it. */ | |
|
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1225 static std::list<std::string> |
| 4397 | 1226 expand_amble (const std::string& text) |
| 4378 | 1227 { |
|
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1228 std::list<std::string> result; |
| 4397 | 1229 |
| 1230 size_t text_len = text.length (); | |
| 1231 size_t start; | |
| 1232 int i, c; | |
| 1233 | |
| 1234 for (start = 0, i = 0, c = 1; c && start < text_len; start = ++i) | |
| 4378 | 1235 { |
| 4397 | 1236 int i0 = i; |
| 1237 int c0 = brace_gobbler (text, i0, brace_arg_separator); | |
| 1238 int i1 = i; | |
| 1239 int c1 = brace_gobbler (text, i1, ENV_SEP); | |
| 4378 | 1240 c = c0 | c1; |
| 1241 i = (i0 < i1 ? i0 : i1); | |
| 1242 | |
| 4397 | 1243 std::string tem = text.substr (start, i-start); |
| 1244 | |
|
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1245 std::list<std::string> partial = brace_expand (tem); |
| 4397 | 1246 |
| 1247 if (result.empty ()) | |
|
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1248 result = partial; |
| 4378 | 1249 else |
|
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1250 result.splice (result.end (), partial); |
| 4378 | 1251 } |
| 4397 | 1252 |
| 1253 return result; | |
| 4378 | 1254 } |
| 1255 | |
|
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1256 /* Start at INDEX, and skip characters in TEXT. Set INDEX to the |
| 4378 | 1257 index of the character matching SATISFY. This understands about |
| 1258 quoting. Return the character that caused us to stop searching; | |
| 1259 this is either the same as SATISFY, or 0. */ | |
| 1260 static int | |
| 4397 | 1261 brace_gobbler (const std::string& text, int& indx, int satisfy) |
| 4378 | 1262 { |
|
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|
1263 int c = 0; |
|
8e056300994b
Follow coding convention of defining and initializing only 1 variable per line in liboctave.
Rik <rik@octave.org>
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|
1264 int level = 0; |
|
8e056300994b
Follow coding convention of defining and initializing only 1 variable per line in liboctave.
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|
1265 int quoted = 0; |
|
8e056300994b
Follow coding convention of defining and initializing only 1 variable per line in liboctave.
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|
1266 int pass_next = 0; |
| 4397 | 1267 |
| 1268 size_t text_len = text.length (); | |
| 1269 | |
| 1270 size_t i = indx; | |
| 1271 | |
| 1272 for (; i < text_len; i++) | |
| 4378 | 1273 { |
| 4397 | 1274 c = text[i]; |
| 1275 | |
| 4378 | 1276 if (pass_next) |
|
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|
1277 { |
|
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|
1278 pass_next = 0; |
|
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|
1279 continue; |
|
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|
1280 } |
| 4378 | 1281 |
| 1282 /* A backslash escapes the next character. This allows backslash to | |
|
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|
1283 escape the quote character in a double-quoted string. */ |
| 4378 | 1284 if (c == '\\' && (quoted == 0 || quoted == '"' || quoted == '`')) |
| 1285 { | |
| 1286 pass_next = 1; | |
| 1287 continue; | |
| 1288 } | |
| 1289 | |
| 1290 if (quoted) | |
|
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|
1291 { |
|
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|
1292 if (c == quoted) |
|
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|
1293 quoted = 0; |
|
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|
1294 continue; |
|
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|
1295 } |
| 4378 | 1296 |
| 1297 if (c == '"' || c == '\'' || c == '`') | |
|
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|
1298 { |
|
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1299 quoted = c; |
|
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|
1300 continue; |
|
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|
1301 } |
| 4391 | 1302 |
|
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|
1303 if (c == satisfy && ! level && ! quoted) |
|
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|
1304 { |
|
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|
1305 /* We ignore an open brace surrounded by whitespace, and also |
|
07ebe522dac2
untabify liboctave C++ sources
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|
1306 an open brace followed immediately by a close brace, that |
|
07ebe522dac2
untabify liboctave C++ sources
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|
1307 was preceded with whitespace. */ |
|
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17d647821d61
maint: More cleanup of C++ code to follow Octave coding conventions.
John W. Eaton <jwe@octave.org>
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|
1308 if (c == '{' |
|
17d647821d61
maint: More cleanup of C++ code to follow Octave coding conventions.
John W. Eaton <jwe@octave.org>
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|
1309 && ((i == 0 || brace_whitespace (text[i-1])) |
|
17d647821d61
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John W. Eaton <jwe@octave.org>
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|
1310 && (i+1 < text_len |
|
17d647821d61
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John W. Eaton <jwe@octave.org>
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|
1311 && (brace_whitespace (text[i+1]) || text[i+1] == '}')))) |
|
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|
1312 continue; |
|
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John W. Eaton <jwe@octave.org>
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|
1313 /* If this is being compiled as part of bash, ignore the '{' |
|
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Rik <rik@octave.org>
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|
1314 in a '${ }' construct */ |
|
10314
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|
1315 if ((c != '{') || i == 0 || (text[i-1] != '$')) |
|
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|
1316 break; |
|
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|
1317 } |
| 4378 | 1318 |
| 1319 if (c == '{') | |
|
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|
1320 level++; |
| 4378 | 1321 else if (c == '}' && level) |
|
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|
1322 level--; |
| 4378 | 1323 } |
| 1324 | |
| 4397 | 1325 indx = i; |
| 1326 return c; | |
| 4378 | 1327 } |
| 1328 | |
| 4399 | 1329 /* Expand extra colons. */ |
| 4378 | 1330 |
| 1331 /* Check for leading colon first, then trailing, then doubled, since | |
| 1332 that is fastest. Usually it will be leading or trailing. */ | |
| 1333 | |
| 4399 | 1334 /* Replace a leading or trailing or doubled : in PATH with DFLT. If |
| 1335 no extra colons, return PATH. Only one extra colon is replaced. | |
| 1336 DFLT may not be NULL. */ | |
| 1337 | |
| 1338 static std::string | |
| 4394 | 1339 kpse_expand_default (const std::string& path, const std::string& fallback) |
| 4378 | 1340 { |
| 4394 | 1341 std::string expansion; |
| 1342 | |
| 1343 size_t path_len = path.length (); | |
| 1344 | |
| 1345 if (path_len == 0) | |
| 1346 expansion = fallback; | |
| 4378 | 1347 |
| 1348 /* Solitary or leading :? */ | |
| 4394 | 1349 else if (IS_ENV_SEP (path[0])) |
| 4378 | 1350 { |
| 4394 | 1351 expansion = path_len == 1 ? fallback : fallback + path; |
| 4378 | 1352 } |
| 1353 | |
| 1354 /* Sorry about the assignment in the middle of the expression, but | |
| 1355 conventions were made to be flouted and all that. I don't see the | |
| 1356 point of calling strlen twice or complicating the logic just to | |
| 1357 avoid the assignment (especially now that I've pointed it out at | |
| 1358 such great length). */ | |
| 4394 | 1359 else if (IS_ENV_SEP (path[path_len-1])) |
| 1360 expansion = path + fallback; | |
| 4378 | 1361 |
| 1362 /* OK, not leading or trailing. Check for doubled. */ | |
| 1363 else | |
| 1364 { | |
| 1365 /* What we'll return if we find none. */ | |
| 4394 | 1366 expansion = path; |
| 1367 | |
| 1368 for (size_t i = 0; i < path_len; i++) | |
| 4378 | 1369 { |
| 4394 | 1370 if (i + 1 < path_len |
|
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|
1371 && IS_ENV_SEP (path[i]) && IS_ENV_SEP (path[i+1])) |
| 4394 | 1372 { |
|
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|
1373 /* We have a doubled colon. */ |
| 4391 | 1374 |
| 4378 | 1375 /* Copy stuff up to and including the first colon. */ |
| 1376 /* Copy in FALLBACK, and then the rest of PATH. */ | |
|
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|
1377 expansion = path.substr (0, i+1) + fallback + path.substr (i+1); |
|
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|
1378 |
|
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|
1379 break; |
| 4378 | 1380 } |
| 1381 } | |
| 1382 } | |
| 4391 | 1383 |
| 4378 | 1384 return expansion; |
| 1385 } | |
| 1386 | |
| 4399 | 1387 /* Translate a path element to its corresponding director{y,ies}. */ |
| 4378 | 1388 |
| 1389 /* To avoid giving prototypes for all the routines and then their real | |
| 1390 definitions, we give all the subroutines first. The entry point is | |
| 1391 the last routine in the file. */ | |
| 4392 | 1392 |
| 4390 | 1393 /* Return true if FN is a directory or a symlink to a directory, |
| 1394 false if not. */ | |
| 1395 | |
| 1396 static bool | |
| 1397 dir_p (const std::string& fn) | |
| 1398 { | |
| 21865 | 1399 octave::sys::file_stat fs (fn); |
| 1400 | |
| 1401 return (fs && fs.is_dir ()); | |
| 4390 | 1402 } |
| 4391 | 1403 |
| 4378 | 1404 /* Here is the entry point. Returns directory list for ELT. */ |
| 1405 | |
|
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|
1406 /* Given a path element ELT, return a the element with a trailing slash |
|
40195d04b17c
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1407 or an empty string if the element is not a directory. |
|
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1408 |
| 4399 | 1409 It's up to the caller to expand ELT. This is because this routine is |
|
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|
1410 most likely only useful to be called from 'kpse_path_search', which |
| 4399 | 1411 has already assumed expansion has been done. */ |
| 1412 | |
|
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|
1413 static std::string |
|
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|
1414 kpse_element_dir (const std::string& elt) |
| 4378 | 1415 { |
|
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|
1416 std::string ret; |
| 4378 | 1417 |
| 1418 /* If given nothing, return nothing. */ | |
| 4398 | 1419 if (elt.empty ()) |
|
21871
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|
1420 return ret; |
| 4378 | 1421 |
|
21873
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1422 if (dir_p (elt)) |
|
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|
1423 { |
|
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|
1424 ret = elt; |
| 4378 | 1425 |
|
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|
1426 char last_char = ret[ret.length () - 1]; |
|
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|
1427 |
|
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|
1428 if (! (IS_DIR_SEP (last_char) || IS_DEVICE_SEP (last_char))) |
|
40195d04b17c
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|
1429 ret += DIR_SEP_STRING; |
|
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|
1430 |
| 4378 | 1431 } |
| 1432 | |
| 1433 return ret; | |
| 1434 } | |
| 1435 | |
| 4399 | 1436 /* Variable expansion. */ |
| 4385 | 1437 |
| 1438 /* We have to keep track of variables being expanded, otherwise | |
| 1439 constructs like TEXINPUTS = $TEXINPUTS result in an infinite loop. | |
| 1440 (Or indirectly recursive variables, etc.) Our simple solution is to | |
| 1441 add to a list each time an expansion is started, and check the list | |
| 1442 before expanding. */ | |
| 1443 | |
| 4391 | 1444 static std::map <std::string, bool> expansions; |
| 4385 | 1445 |
| 1446 static void | |
| 4391 | 1447 expanding (const std::string& var, bool xp) |
| 4385 | 1448 { |
| 4391 | 1449 expansions[var] = xp; |
| 4385 | 1450 } |
| 1451 | |
| 1452 /* Return whether VAR is currently being expanding. */ | |
| 1453 | |
| 4391 | 1454 static bool |
| 1455 expanding_p (const std::string& var) | |
| 4385 | 1456 { |
|
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1457 return (expansions.find (var) != expansions.end ()) ? expansions[var] : false; |
| 4385 | 1458 } |
| 4392 | 1459 |
|
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1460 /* Append the result of value of 'var' to EXPANSION, where 'var' begins |
|
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1461 at START and ends at END. If 'var' is not set, do not complain. |
| 4385 | 1462 This is a subroutine for the more complicated expansion function. */ |
| 1463 | |
| 1464 static void | |
| 4391 | 1465 expand (std::string &expansion, const std::string& var) |
| 4385 | 1466 { |
| 4391 | 1467 if (expanding_p (var)) |
| 1468 { | |
|
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|
1469 (*current_liboctave_warning_with_id_handler) |
|
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1470 ("Octave:pathsearch-syntax", |
|
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1471 "kpathsea: variable '%s' references itself (eventually)", |
|
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|
1472 var.c_str ()); |
| 4385 | 1473 } |
| 4391 | 1474 else |
| 1475 { | |
| 1476 /* Check for an environment variable. */ | |
|
21732
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|
1477 std::string value = octave::sys::env::getenv (var); |
| 4391 | 1478 |
| 1479 if (! value.empty ()) | |
|
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|
1480 { |
|
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|
1481 expanding (var, true); |
|
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|
1482 std::string tmp = kpse_var_expand (value); |
|
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|
1483 expanding (var, false); |
|
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|
1484 expansion += tmp; |
|
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|
1485 } |
| 4391 | 1486 } |
| 4385 | 1487 } |
| 4392 | 1488 |
| 4385 | 1489 /* Can't think of when it would be useful to change these (and the |
| 1490 diagnostic messages assume them), but ... */ | |
|
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1491 #if ! defined (IS_VAR_START) |
|
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1492 /* starts all variable references */ |
| 4385 | 1493 #define IS_VAR_START(c) ((c) == '$') |
| 1494 #endif | |
|
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|
1495 #if ! defined (IS_VAR_CHAR) |
|
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|
1496 /* variable name constituent */ |
| 4385 | 1497 #define IS_VAR_CHAR(c) (isalnum (c) || (c) == '_') |
| 1498 #endif | |
|
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1499 #if ! defined (IS_VAR_BEGIN_DELIMITER) |
|
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|
1500 /* start delimited variable name (after $) */ |
| 4385 | 1501 #define IS_VAR_BEGIN_DELIMITER(c) ((c) == '{') |
| 1502 #endif | |
|
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1503 #if ! defined (IS_VAR_END_DELIMITER) |
| 4385 | 1504 #define IS_VAR_END_DELIMITER(c) ((c) == '}') |
| 1505 #endif | |
| 1506 | |
| 1507 /* Maybe we should support some or all of the various shell ${...} | |
| 1508 constructs, especially ${var-value}. */ | |
| 1509 | |
| 5085 | 1510 static std::string |
| 4391 | 1511 kpse_var_expand (const std::string& src) |
| 4385 | 1512 { |
| 4389 | 1513 std::string expansion; |
| 4391 | 1514 |
| 1515 size_t src_len = src.length (); | |
| 1516 | |
| 4385 | 1517 /* Copy everything but variable constructs. */ |
| 4391 | 1518 for (size_t i = 0; i < src_len; i++) |
| 1519 { | |
| 1520 if (IS_VAR_START (src[i])) | |
|
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1521 { |
|
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1522 i++; |
|
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1523 |
|
15466
d174210ce1ec
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1524 /* Three cases: '$VAR', '${VAR}', '$<anything-else>'. */ |
|
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1525 if (IS_VAR_CHAR (src[i])) |
|
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1526 { |
|
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1527 /* $V: collect name constituents, then expand. */ |
|
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1528 size_t var_end = i; |
|
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1529 |
|
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1530 do |
|
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1531 { |
|
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|
1532 var_end++; |
|
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|
1533 } |
|
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1534 while (IS_VAR_CHAR (src[var_end])); |
|
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1535 |
|
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1536 var_end--; /* had to go one past */ |
|
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1537 expand (expansion, src.substr (i, var_end - i + 1)); |
|
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|
1538 i = var_end; |
|
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|
1539 |
|
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|
1540 } |
|
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1541 else if (IS_VAR_BEGIN_DELIMITER (src[i])) |
|
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|
1542 { |
|
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|
1543 /* ${: scan ahead for matching delimiter, then expand. */ |
|
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|
1544 size_t var_end = ++i; |
|
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|
1545 |
|
20955
77f5591878bf
maint: Use '! expr' rather than '!expr' to conform to coding guidelines.
Rik <rik@octave.org>
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diff
changeset
|
1546 while (var_end < src_len && ! IS_VAR_END_DELIMITER (src[var_end])) |
|
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|
1547 var_end++; |
|
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|
1548 |
|
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|
1549 if (var_end == src_len) |
|
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|
1550 { |
|
19410
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|
1551 (*current_liboctave_warning_with_id_handler) |
|
95c533ed464b
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|
1552 ("Octave:pathsearch-syntax", |
|
95c533ed464b
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|
1553 "%s: No matching } for ${", src.c_str ()); |
|
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|
1554 i = var_end - 1; /* will incr to eos at top of loop */ |
|
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|
1555 } |
|
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|
1556 else |
|
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|
1557 { |
|
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|
1558 expand (expansion, src.substr (i, var_end - i)); |
|
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|
1559 i = var_end; /* will incr past } at top of loop*/ |
|
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|
1560 } |
|
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|
1561 } |
|
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|
1562 else |
|
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|
1563 { |
|
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|
1564 /* $<something-else>: error. */ |
|
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|
1565 (*current_liboctave_warning_with_id_handler) |
|
95c533ed464b
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|
1566 ("Octave:pathsearch-syntax", |
|
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|
1567 "%s: Unrecognized variable construct '$%c'", |
|
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|
1568 src.c_str (), src[i]); |
|
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|
1569 |
|
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|
1570 /* Just ignore those chars and keep going. */ |
|
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|
1571 } |
|
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|
1572 } |
| 4391 | 1573 else |
|
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|
1574 expansion += src[i]; |
| 4391 | 1575 } |
| 4389 | 1576 |
| 1577 return expansion; | |
| 4385 | 1578 } |