Guido van Rossum | 582646a | 1996-05-28 22:30:17 +0000 | [diff] [blame] | 1 | /*********************************************************** |
| 2 | Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, |
| 3 | The Netherlands. |
| 4 | |
| 5 | All Rights Reserved |
| 6 | |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 7 | Permission to use, copy, modify, and distribute this software and its |
| 8 | documentation for any purpose and without fee is hereby granted, |
Guido van Rossum | 582646a | 1996-05-28 22:30:17 +0000 | [diff] [blame] | 9 | provided that the above copyright notice appear in all copies and that |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 10 | both that copyright notice and this permission notice appear in |
Guido van Rossum | 582646a | 1996-05-28 22:30:17 +0000 | [diff] [blame] | 11 | supporting documentation, and that the names of Stichting Mathematisch |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 12 | Centrum or CWI or Corporation for National Research Initiatives or |
| 13 | CNRI not be used in advertising or publicity pertaining to |
| 14 | distribution of the software without specific, written prior |
| 15 | permission. |
Guido van Rossum | 582646a | 1996-05-28 22:30:17 +0000 | [diff] [blame] | 16 | |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 17 | While CWI is the initial source for this software, a modified version |
| 18 | is made available by the Corporation for National Research Initiatives |
| 19 | (CNRI) at the Internet address ftp://ftp.python.org. |
| 20 | |
| 21 | STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH |
| 22 | REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF |
| 23 | MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH |
| 24 | CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL |
| 25 | DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 26 | PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 27 | TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 28 | PERFORMANCE OF THIS SOFTWARE. |
Guido van Rossum | 582646a | 1996-05-28 22:30:17 +0000 | [diff] [blame] | 29 | |
| 30 | ******************************************************************/ |
| 31 | |
| 32 | /* Return the initial module search path. */ |
| 33 | |
Guido van Rossum | 667d704 | 1995-08-04 04:20:48 +0000 | [diff] [blame] | 34 | #include "Python.h" |
| 35 | #include "osdefs.h" |
| 36 | |
Guido van Rossum | 305e5d0 | 1997-04-11 17:18:45 +0000 | [diff] [blame^] | 37 | #include <sys/types.h> |
| 38 | #include <sys/stat.h> |
| 39 | #include <strings.h> |
Guido van Rossum | 667d704 | 1995-08-04 04:20:48 +0000 | [diff] [blame] | 40 | |
Guido van Rossum | 305e5d0 | 1997-04-11 17:18:45 +0000 | [diff] [blame^] | 41 | #if HAVE_UNISTD_H |
| 42 | #include <unistd.h> |
| 43 | #endif /* HAVE_UNISTD_H */ |
| 44 | |
| 45 | /* Search in some common locations for the associated Python libraries. |
| 46 | * |
| 47 | * Two directories must be found, the platform independent directory |
| 48 | * (prefix), containing the common .py and .pyc files, and the |
| 49 | * platform dependent directory (exec_prefix), containing the shared |
| 50 | * library modules. Note that prefix and exec_prefix can be the same |
| 51 | * directory, but for some installations, they are different. |
| 52 | * |
| 53 | * Py_GetPath() carries out separate searches for prefix and |
| 54 | * exec_prefix. Each search tries a number of different locations |
| 55 | * until a ``landmark'' file or directory is found. If no prefix or |
| 56 | * exec_prefix is found, a warning message is issued and the |
| 57 | * preprocessor defines PREFIX and EXEC_PREFIX are used (even though |
| 58 | * they will not work); python carries on as best as is possible, but |
| 59 | * most imports will fail. |
| 60 | * |
| 61 | * Before any searches are done, the location of the executable is |
| 62 | * determined. If argv[0] has a slash in it (or more), this is it; |
| 63 | * otherwise, it must have been invoked from the shell's path, so we |
| 64 | * search $PATH for the named executable and use that. If the |
| 65 | * executable was not found on $PATH (or there was no $PATH |
| 66 | * environment variable), the original argv[0] string is used. |
| 67 | * |
| 68 | * Next, either the executable location is examined to see if it is a |
| 69 | * symbolic link. If so, the link is chased (correctly interpreting a |
| 70 | * relative pathname if one is found) and the directory of the link |
| 71 | * target is used as instead. |
| 72 | * |
| 73 | * Finally, argv0_path is set to the directory containing the |
| 74 | * executable (i.e. the last component is stripped). |
| 75 | * |
| 76 | * With argv0_path in hand, we perform a number of steps. The same |
| 77 | * steps are performed for prefix and for exec_prefix, but with a |
| 78 | * different landmark. |
| 79 | * |
| 80 | * Step 1. Are we running python out of the build directory? This is |
| 81 | * checked by looking for a different kind of landmark relative to |
| 82 | * argv0_path. For prefix, the landmark's path is derived from the |
| 83 | * VPATH preprocessor variable (taking into account that its value is |
| 84 | * almost, but not quite, what we need). If the landmark is found, |
| 85 | * we're done. |
| 86 | * |
| 87 | * For the remaining steps, the prefix landmark will always be |
| 88 | * lib/python$VERSION/string.py and the exec_prefix will always be |
| 89 | * lib/python$VERSION/sharedmodules, where $VERSION is Python's |
| 90 | * version number as supplied by the Makefile. Note that this means |
| 91 | * that no more build directory checking is performed; if the first |
| 92 | * two steps did not find the landmarks, the assumption is that python |
| 93 | * is running from an installed setup. |
| 94 | * |
| 95 | * Step 2. See if the $PYTHONHOME environment variable points to the |
| 96 | * installed location of the Python libraries. If $PYTHONHOME is set, |
| 97 | * then it points to prefix and exec_prefix. $PYTHONHOME can be a |
| 98 | * single directory, which is used for both, or the prefix and |
| 99 | * exec_prefix directories separated by a colon. |
| 100 | * |
| 101 | * Step 3. Try to find prefix and exec_prefix relative to argv0_path, |
| 102 | * backtracking up the path until it is exhausted. This is the most |
| 103 | * common step to succeed. Note that if prefix and exec_prefix are |
| 104 | * different, exec_prefix is more likely to be found; however if |
| 105 | * exec_prefix is a subdirectory of prefix, both will be found. |
| 106 | * |
| 107 | * Step 4. Search the directories pointed to by the preprocessor |
| 108 | * variables PREFIX and EXEC_PREFIX. These are supplied by the |
| 109 | * Makefile but can be passed in as options to the configure script. |
| 110 | * |
| 111 | * Step 5. Search some `standard' directories, namely: /usr/local, |
| 112 | * /usr, then finally /. |
| 113 | * |
| 114 | * That's it! Well, almost. Once we have determined prefix and |
| 115 | * exec_prefix, the preprocesor variable PYTHONPATH is used to |
| 116 | * construct a path. Each relative path on PYTHONPATH is prefixed |
| 117 | * with prefix. Then the directory containing the shared library |
| 118 | * modules is appended. The environment variable $PYTHONPATH is |
| 119 | * inserted in front of it all. Finally, the prefix and exec_prefix |
| 120 | * globals are tweaked so the reflect the values expected by other |
| 121 | * code, by stripping the "lib/python$VERSION/..." stuff off. If |
| 122 | * either points to the build directory, the globals are reset to the |
| 123 | * corresponding preprocessor variables (so sys.prefix will reflect |
| 124 | * the installation location, even though sys.path points into the |
| 125 | * build directory). This seems to make more sense given that |
| 126 | * currently the only known use of sys.prefix and sys.exec_prefix is |
| 127 | * for the ILU installation process to find the installed Python tree. */ |
| 128 | |
| 129 | #ifndef VERSION |
| 130 | #define VERSION "1.5" |
| 131 | #endif |
| 132 | |
| 133 | #ifndef VPATH |
| 134 | #define VPATH "." |
Guido van Rossum | 667d704 | 1995-08-04 04:20:48 +0000 | [diff] [blame] | 135 | #endif |
| 136 | |
Guido van Rossum | c34c9a5 | 1996-06-12 04:20:27 +0000 | [diff] [blame] | 137 | #ifndef PREFIX |
| 138 | #define PREFIX "/usr/local" |
| 139 | #endif |
| 140 | |
| 141 | #ifndef EXEC_PREFIX |
Guido van Rossum | 6e12d56 | 1996-07-30 20:36:12 +0000 | [diff] [blame] | 142 | #define EXEC_PREFIX PREFIX |
Guido van Rossum | c34c9a5 | 1996-06-12 04:20:27 +0000 | [diff] [blame] | 143 | #endif |
| 144 | |
Guido van Rossum | 305e5d0 | 1997-04-11 17:18:45 +0000 | [diff] [blame^] | 145 | #ifndef PYTHONPATH |
| 146 | /* I know this isn't K&R C, but the Makefile specifies it anyway */ |
| 147 | #define PYTHONPATH PREFIX "/lib/python" VERSION ":" \ |
| 148 | PREFIX "/lib/python" VERSION "/test" ":" \ |
| 149 | EXEC_PREFIX "/lib/python" VERSION "/sharedmodules" |
| 150 | #endif |
Guido van Rossum | 667d704 | 1995-08-04 04:20:48 +0000 | [diff] [blame] | 151 | |
Guido van Rossum | 305e5d0 | 1997-04-11 17:18:45 +0000 | [diff] [blame^] | 152 | #ifndef LANDMARK |
| 153 | #define LANDMARK "string.py" |
| 154 | #endif |
| 155 | |
| 156 | static char *std_dirs[] = {"/usr/local/", "/usr/", "/", NULL}; |
| 157 | |
| 158 | static char prefix[MAXPATHLEN+1]; |
| 159 | static char exec_prefix[MAXPATHLEN+1]; |
| 160 | static char *module_search_path = NULL; |
| 161 | static char lib_python[20]; /* Dynamically set to "lib/python" VERSION */ |
| 162 | |
| 163 | static void |
| 164 | reduce(dir) |
| 165 | char *dir; |
| 166 | { |
| 167 | int i = strlen(dir); |
| 168 | while (i > 0 && dir[i] != SEP) |
| 169 | --i; |
| 170 | dir[i] = '\0'; |
| 171 | } |
| 172 | |
| 173 | |
| 174 | static int |
| 175 | exists(filename) |
| 176 | char *filename; |
| 177 | { |
| 178 | struct stat buf; |
| 179 | return stat(filename, &buf) == 0; |
| 180 | } |
| 181 | |
| 182 | |
| 183 | static void |
| 184 | join(buffer, stuff) |
| 185 | char *buffer; |
| 186 | char *stuff; |
| 187 | { |
| 188 | int n, k; |
| 189 | if (stuff[0] == SEP) |
| 190 | n = 0; |
| 191 | else { |
| 192 | n = strlen(buffer); |
| 193 | if (n > 0 && buffer[n-1] != SEP && n < MAXPATHLEN) |
| 194 | buffer[n++] = SEP; |
| 195 | } |
| 196 | k = strlen(stuff); |
| 197 | if (n + k > MAXPATHLEN) |
| 198 | k = MAXPATHLEN - n; |
| 199 | strncpy(buffer+n, stuff, k); |
| 200 | buffer[n+k] = '\0'; |
| 201 | } |
| 202 | |
| 203 | |
| 204 | /* Make sure path ends in a slash. |
| 205 | * Assume path is MAXPATHLEN+1 sized buffer. |
| 206 | */ |
| 207 | static void |
| 208 | string_addsep(path) |
| 209 | char *path; |
| 210 | { |
| 211 | int len = strlen(path); |
| 212 | |
| 213 | if (path[len-1] != SEP) { |
| 214 | path[len] = SEP; |
| 215 | if (len < MAXPATHLEN) |
| 216 | len++; |
| 217 | path[len] = '\0'; |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | |
| 222 | /* Append a source string onto the destination string, watching for |
| 223 | * buffer overruns. Assumes dest is MAXPATHLEN+1 sized buffer. |
| 224 | */ |
| 225 | static void |
| 226 | string_append(dest, source) |
| 227 | char *dest; |
| 228 | char *source; |
| 229 | { |
| 230 | int dlen = strlen(dest); |
| 231 | int slen = strlen(source); |
| 232 | int len = dlen + slen; |
| 233 | |
| 234 | strncat(dest, source, MAXPATHLEN - dlen); |
| 235 | if (len < MAXPATHLEN) |
| 236 | len++; |
| 237 | dest[len] = '\0'; |
| 238 | } |
| 239 | |
| 240 | |
| 241 | static int |
| 242 | search_for_prefix(argv0_path, home) |
| 243 | char *argv0_path; |
| 244 | char *home; |
| 245 | { |
| 246 | int i, n; |
| 247 | char *vpath; |
| 248 | |
| 249 | /* Check VPATH to see if argv0_path is in the build directory. |
| 250 | * Complication: the VPATH passed in is relative to the |
| 251 | * Modules build directory and points to the Modules source |
| 252 | * directory; we need it relative to the build tree and |
| 253 | * pointing to the source tree. Solution: chop off a leading |
| 254 | * ".." (but only if it's there -- it could be an absolute |
| 255 | * path) and chop off the final component (assuming it's |
| 256 | * "Modules"). |
| 257 | */ |
| 258 | vpath = VPATH; |
| 259 | if (vpath[0] == '.' && vpath[1] == '.' && vpath[2] == '/') |
| 260 | vpath += 3; |
| 261 | strcpy(prefix, argv0_path); |
| 262 | join(prefix, vpath); |
| 263 | reduce(prefix); |
| 264 | join(prefix, "Lib"); |
| 265 | join(prefix, LANDMARK); |
| 266 | if (exists(prefix)) |
| 267 | return -1; |
| 268 | |
| 269 | if (home) { |
| 270 | /* Check $PYTHONHOME */ |
| 271 | char *delim; |
| 272 | strcpy(prefix, home); |
| 273 | delim = strchr(prefix, DELIM); |
| 274 | if (delim) |
| 275 | *delim = '\0'; |
| 276 | join(prefix, lib_python); |
| 277 | join(prefix, LANDMARK); |
| 278 | if (exists(prefix)) |
| 279 | return 1; |
| 280 | } |
| 281 | |
| 282 | /* Search from argv0_path, until root is found */ |
| 283 | strcpy(prefix, argv0_path); |
| 284 | do { |
| 285 | n = strlen(prefix); |
| 286 | join(prefix, lib_python); |
| 287 | join(prefix, LANDMARK); |
| 288 | if (exists(prefix)) |
| 289 | return 1; |
| 290 | prefix[n] = '\0'; |
| 291 | reduce(prefix); |
| 292 | } while (prefix[0]); |
| 293 | |
| 294 | /* Look at configure's PREFIX */ |
| 295 | strcpy(prefix, PREFIX); |
| 296 | join(prefix, lib_python); |
| 297 | join(prefix, LANDMARK); |
| 298 | if (exists(prefix)) |
| 299 | return 1; |
| 300 | |
| 301 | /* Look at `standard' directories */ |
| 302 | for (i = 0; std_dirs[i]; i++) { |
| 303 | strcpy(prefix, std_dirs[i]); |
| 304 | join(prefix, lib_python); |
| 305 | join(prefix, LANDMARK); |
| 306 | if (exists(prefix)) |
| 307 | return 1; |
| 308 | } |
| 309 | return 0; |
| 310 | } |
| 311 | |
| 312 | |
| 313 | static int |
| 314 | search_for_exec_prefix(argv0_path, home) |
| 315 | char *argv0_path; |
| 316 | char *home; |
| 317 | { |
| 318 | int i, n; |
| 319 | |
| 320 | /* Check to see if argv[0] is in the build directory */ |
| 321 | strcpy(exec_prefix, argv0_path); |
| 322 | join(exec_prefix, "Modules/Setup"); |
| 323 | if (exists(exec_prefix)) { |
| 324 | reduce(exec_prefix); |
| 325 | return -1; |
| 326 | } |
| 327 | |
| 328 | if (home) { |
| 329 | /* Check $PYTHONHOME */ |
| 330 | char *delim; |
| 331 | delim = strchr(home, DELIM); |
| 332 | if (delim) |
| 333 | strcpy(exec_prefix, delim+1); |
| 334 | else |
| 335 | strcpy(exec_prefix, home); |
| 336 | join(exec_prefix, lib_python); |
| 337 | join(exec_prefix, "sharedmodules"); |
| 338 | if (exists(exec_prefix)) |
| 339 | return 1; |
| 340 | } |
| 341 | |
| 342 | /* Search from argv0_path, until root is found */ |
| 343 | strcpy(exec_prefix, argv0_path); |
| 344 | do { |
| 345 | n = strlen(exec_prefix); |
| 346 | join(exec_prefix, lib_python); |
| 347 | join(exec_prefix, "sharedmodules"); |
| 348 | if (exists(exec_prefix)) |
| 349 | return 1; |
| 350 | exec_prefix[n] = '\0'; |
| 351 | reduce(exec_prefix); |
| 352 | } while (exec_prefix[0]); |
| 353 | |
| 354 | /* Look at configure's EXEC_PREFIX */ |
| 355 | strcpy(exec_prefix, EXEC_PREFIX); |
| 356 | join(exec_prefix, lib_python); |
| 357 | join(exec_prefix, "sharedmodules"); |
| 358 | if (exists(exec_prefix)) |
| 359 | return 1; |
| 360 | |
| 361 | /* Look at `standard' directories */ |
| 362 | for (i = 0; std_dirs[i]; i++) { |
| 363 | strcpy(exec_prefix, std_dirs[i]); |
| 364 | join(exec_prefix, lib_python); |
| 365 | join(exec_prefix, "sharedmodules"); |
| 366 | if (exists(exec_prefix)) |
| 367 | return 1; |
| 368 | } |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | |
| 373 | static void |
| 374 | calculate_path() |
| 375 | { |
| 376 | extern char *Py_GetProgramName(); |
| 377 | |
| 378 | char delimiter[2] = {DELIM, '\0'}; |
| 379 | char separator[2] = {SEP, '\0'}; |
| 380 | char *pythonpath = PYTHONPATH; |
| 381 | char *rtpypath = getenv("PYTHONPATH"); |
| 382 | char *home = getenv("PYTHONHOME"); |
| 383 | char *path = getenv("PATH"); |
| 384 | char *prog = Py_GetProgramName(); |
| 385 | char argv0_path[MAXPATHLEN+1]; |
| 386 | char progpath[MAXPATHLEN+1]; |
| 387 | int pfound, efound; /* 1 if found; -1 if found build directory */ |
| 388 | char *buf; |
| 389 | int bufsz; |
| 390 | int prefixsz; |
| 391 | char *defpath = pythonpath; |
| 392 | |
| 393 | /* Initialize this dynamically for K&R C */ |
| 394 | sprintf(lib_python, "lib/python%s", VERSION); |
| 395 | |
| 396 | /* If there is no slash in the argv0 path, then we have to |
| 397 | * assume python is on the user's $PATH, since there's no |
| 398 | * other way to find a directory to start the search from. If |
| 399 | * $PATH isn't exported, you lose. |
| 400 | */ |
| 401 | if (strchr(prog, SEP)) |
| 402 | strcpy(progpath, prog); |
| 403 | else if (path) { |
| 404 | while (1) { |
| 405 | char *delim = strchr(path, DELIM); |
| 406 | |
| 407 | if (delim) { |
| 408 | int len = delim - path; |
| 409 | strncpy(progpath, path, len); |
| 410 | *(progpath + len) = '\0'; |
| 411 | } |
| 412 | else |
| 413 | strcpy(progpath, path); |
| 414 | |
| 415 | join(progpath, prog); |
| 416 | if (exists(progpath)) |
| 417 | break; |
| 418 | |
| 419 | if (!delim) { |
| 420 | progpath[0] = '\0'; |
| 421 | break; |
| 422 | } |
| 423 | path = delim + 1; |
| 424 | } |
| 425 | } |
| 426 | else |
| 427 | progpath[0] = '\0'; |
| 428 | |
| 429 | strcpy(argv0_path, progpath); |
| 430 | |
| 431 | #if HAVE_READLINK |
| 432 | { |
| 433 | char tmpbuffer[MAXPATHLEN+1]; |
| 434 | int linklen = readlink(progpath, tmpbuffer, MAXPATHLEN); |
| 435 | if (linklen != -1) { |
| 436 | /* It's not null terminated! */ |
| 437 | tmpbuffer[linklen] = '\0'; |
| 438 | if (tmpbuffer[0] == SEP) |
| 439 | strcpy(argv0_path, tmpbuffer); |
| 440 | else { |
| 441 | /* Interpret relative to progpath */ |
| 442 | reduce(argv0_path); |
| 443 | join(argv0_path, tmpbuffer); |
| 444 | } |
| 445 | } |
| 446 | } |
| 447 | #endif /* HAVE_READLINK */ |
| 448 | |
| 449 | reduce(argv0_path); |
| 450 | |
| 451 | if (!(pfound = search_for_prefix(argv0_path, home))) { |
| 452 | fprintf(stderr, |
| 453 | "Could not find platform independent libraries <prefix>\n"); |
| 454 | strcpy(prefix, PREFIX); |
| 455 | join(prefix, lib_python); |
| 456 | } |
| 457 | else |
| 458 | reduce(prefix); |
| 459 | |
| 460 | if (!(efound = search_for_exec_prefix(argv0_path, home))) { |
| 461 | fprintf(stderr, |
| 462 | "Could not find platform dependent libraries <exec_prefix>\n"); |
| 463 | strcpy(exec_prefix, EXEC_PREFIX); |
| 464 | join(exec_prefix, "lib/sharedmodules"); |
| 465 | } |
| 466 | /* If we found EXEC_PREFIX do *not* reduce it! (Yet.) */ |
| 467 | |
| 468 | if (!pfound || !efound) |
| 469 | fprintf(stderr, |
| 470 | "Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]\n"); |
| 471 | |
| 472 | /* Calculate size of return buffer. |
| 473 | */ |
| 474 | bufsz = 0; |
| 475 | |
| 476 | if (rtpypath) |
| 477 | bufsz += strlen(rtpypath) + 1; |
| 478 | |
| 479 | prefixsz = strlen(prefix) + 1; |
| 480 | |
| 481 | while (1) { |
| 482 | char *delim = strchr(defpath, DELIM); |
| 483 | |
| 484 | if (defpath[0] != SEP) |
| 485 | /* Paths are relative to prefix */ |
| 486 | bufsz += prefixsz; |
| 487 | |
| 488 | if (delim) |
| 489 | bufsz += delim - defpath + 1; |
| 490 | else { |
| 491 | bufsz += strlen(defpath) + 1; |
| 492 | break; |
| 493 | } |
| 494 | defpath = delim + 1; |
| 495 | } |
| 496 | |
| 497 | bufsz += strlen(exec_prefix) + 1; |
| 498 | |
| 499 | /* This is the only malloc call in this file */ |
| 500 | buf = malloc(bufsz); |
| 501 | |
| 502 | if (buf == NULL) { |
| 503 | /* We can't exit, so print a warning and limp along */ |
| 504 | fprintf(stderr, "Not enough memory for dynamic PYTHONPATH.\n"); |
| 505 | fprintf(stderr, "Using default static PYTHONPATH.\n"); |
| 506 | module_search_path = PYTHONPATH; |
| 507 | } |
| 508 | else { |
| 509 | /* Run-time value of $PYTHONPATH goes first */ |
| 510 | if (rtpypath) { |
| 511 | strcpy(buf, rtpypath); |
| 512 | strcat(buf, delimiter); |
| 513 | } |
| 514 | |
| 515 | /* Next goes merge of compile-time $PYTHONPATH with |
| 516 | * dynamically located prefix. |
| 517 | */ |
| 518 | defpath = pythonpath; |
| 519 | while (1) { |
| 520 | char *delim = strchr(defpath, DELIM); |
| 521 | |
| 522 | if (defpath[0] != SEP) { |
| 523 | strcat(buf, prefix); |
| 524 | strcat(buf, separator); |
| 525 | } |
| 526 | |
| 527 | if (delim) { |
| 528 | int len = delim - defpath + 1; |
| 529 | int end = strlen(buf) + len; |
| 530 | strncat(buf, defpath, len); |
| 531 | *(buf + end) = '\0'; |
| 532 | } |
| 533 | else { |
| 534 | strcat(buf, defpath); |
| 535 | break; |
| 536 | } |
| 537 | defpath = delim + 1; |
| 538 | } |
| 539 | strcat(buf, delimiter); |
| 540 | |
| 541 | /* Finally, on goes the directory for dynamic-load modules */ |
| 542 | strcat(buf, exec_prefix); |
| 543 | |
| 544 | /* And publish the results */ |
| 545 | module_search_path = buf; |
| 546 | } |
| 547 | |
| 548 | /* Reduce prefix and exec_prefix to their essence, |
| 549 | * e.g. /usr/local/lib/python1.5 is reduced to /usr/local. |
| 550 | * If we're loading relative to the build directory, |
| 551 | * return the compiled-in defaults instead. |
| 552 | */ |
| 553 | if (pfound > 0) { |
| 554 | reduce(prefix); |
| 555 | reduce(prefix); |
| 556 | } |
| 557 | else |
| 558 | strcpy(prefix, PREFIX); |
| 559 | |
| 560 | if (efound > 0) { |
| 561 | reduce(exec_prefix); |
| 562 | reduce(exec_prefix); |
| 563 | reduce(exec_prefix); |
| 564 | } |
| 565 | else |
| 566 | strcpy(exec_prefix, EXEC_PREFIX); |
| 567 | } |
| 568 | |
| 569 | |
| 570 | /* External interface */ |
Guido van Rossum | 667d704 | 1995-08-04 04:20:48 +0000 | [diff] [blame] | 571 | |
| 572 | char * |
Guido van Rossum | 582646a | 1996-05-28 22:30:17 +0000 | [diff] [blame] | 573 | Py_GetPath() |
Guido van Rossum | 667d704 | 1995-08-04 04:20:48 +0000 | [diff] [blame] | 574 | { |
Guido van Rossum | 305e5d0 | 1997-04-11 17:18:45 +0000 | [diff] [blame^] | 575 | if (!module_search_path) |
| 576 | calculate_path(); |
| 577 | return module_search_path; |
Guido van Rossum | 667d704 | 1995-08-04 04:20:48 +0000 | [diff] [blame] | 578 | } |
Guido van Rossum | c34c9a5 | 1996-06-12 04:20:27 +0000 | [diff] [blame] | 579 | |
Guido van Rossum | c34c9a5 | 1996-06-12 04:20:27 +0000 | [diff] [blame] | 580 | char * |
| 581 | Py_GetPrefix() |
| 582 | { |
Guido van Rossum | 305e5d0 | 1997-04-11 17:18:45 +0000 | [diff] [blame^] | 583 | if (!module_search_path) |
| 584 | calculate_path(); |
| 585 | return prefix; |
Guido van Rossum | c34c9a5 | 1996-06-12 04:20:27 +0000 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | char * |
| 589 | Py_GetExecPrefix() |
| 590 | { |
Guido van Rossum | 305e5d0 | 1997-04-11 17:18:45 +0000 | [diff] [blame^] | 591 | if (!module_search_path) |
| 592 | calculate_path(); |
| 593 | return exec_prefix; |
Guido van Rossum | c34c9a5 | 1996-06-12 04:20:27 +0000 | [diff] [blame] | 594 | } |