Line data Source code
1 : /* Return the initial module search path. */
2 :
3 : #include "Python.h"
4 : #include "osdefs.h"
5 :
6 : #include <sys/types.h>
7 : #include <string.h>
8 :
9 : #ifdef __APPLE__
10 : #include <mach-o/dyld.h>
11 : #endif
12 :
13 : /* Search in some common locations for the associated Python libraries.
14 : *
15 : * Two directories must be found, the platform independent directory
16 : * (prefix), containing the common .py and .pyc files, and the platform
17 : * dependent directory (exec_prefix), containing the shared library
18 : * modules. Note that prefix and exec_prefix can be the same directory,
19 : * but for some installations, they are different.
20 : *
21 : * Py_GetPath() carries out separate searches for prefix and exec_prefix.
22 : * Each search tries a number of different locations until a ``landmark''
23 : * file or directory is found. If no prefix or exec_prefix is found, a
24 : * warning message is issued and the preprocessor defined PREFIX and
25 : * EXEC_PREFIX are used (even though they will not work); python carries on
26 : * as best as is possible, but most imports will fail.
27 : *
28 : * Before any searches are done, the location of the executable is
29 : * determined. If argv[0] has one or more slashes in it, it is used
30 : * unchanged. Otherwise, it must have been invoked from the shell's path,
31 : * so we search $PATH for the named executable and use that. If the
32 : * executable was not found on $PATH (or there was no $PATH environment
33 : * variable), the original argv[0] string is used.
34 : *
35 : * Next, the executable location is examined to see if it is a symbolic
36 : * link. If so, the link is chased (correctly interpreting a relative
37 : * pathname if one is found) and the directory of the link target is used.
38 : *
39 : * Finally, argv0_path is set to the directory containing the executable
40 : * (i.e. the last component is stripped).
41 : *
42 : * With argv0_path in hand, we perform a number of steps. The same steps
43 : * are performed for prefix and for exec_prefix, but with a different
44 : * landmark.
45 : *
46 : * Step 1. Are we running python out of the build directory? This is
47 : * checked by looking for a different kind of landmark relative to
48 : * argv0_path. For prefix, the landmark's path is derived from the VPATH
49 : * preprocessor variable (taking into account that its value is almost, but
50 : * not quite, what we need). For exec_prefix, the landmark is
51 : * Modules/Setup. If the landmark is found, we're done.
52 : *
53 : * For the remaining steps, the prefix landmark will always be
54 : * lib/python$VERSION/os.py and the exec_prefix will always be
55 : * lib/python$VERSION/lib-dynload, where $VERSION is Python's version
56 : * number as supplied by the Makefile. Note that this means that no more
57 : * build directory checking is performed; if the first step did not find
58 : * the landmarks, the assumption is that python is running from an
59 : * installed setup.
60 : *
61 : * Step 2. See if the $PYTHONHOME environment variable points to the
62 : * installed location of the Python libraries. If $PYTHONHOME is set, then
63 : * it points to prefix and exec_prefix. $PYTHONHOME can be a single
64 : * directory, which is used for both, or the prefix and exec_prefix
65 : * directories separated by a colon.
66 : *
67 : * Step 3. Try to find prefix and exec_prefix relative to argv0_path,
68 : * backtracking up the path until it is exhausted. This is the most common
69 : * step to succeed. Note that if prefix and exec_prefix are different,
70 : * exec_prefix is more likely to be found; however if exec_prefix is a
71 : * subdirectory of prefix, both will be found.
72 : *
73 : * Step 4. Search the directories pointed to by the preprocessor variables
74 : * PREFIX and EXEC_PREFIX. These are supplied by the Makefile but can be
75 : * passed in as options to the configure script.
76 : *
77 : * That's it!
78 : *
79 : * Well, almost. Once we have determined prefix and exec_prefix, the
80 : * preprocessor variable PYTHONPATH is used to construct a path. Each
81 : * relative path on PYTHONPATH is prefixed with prefix. Then the directory
82 : * containing the shared library modules is appended. The environment
83 : * variable $PYTHONPATH is inserted in front of it all. Finally, the
84 : * prefix and exec_prefix globals are tweaked so they reflect the values
85 : * expected by other code, by stripping the "lib/python$VERSION/..." stuff
86 : * off. If either points to the build directory, the globals are reset to
87 : * the corresponding preprocessor variables (so sys.prefix will reflect the
88 : * installation location, even though sys.path points into the build
89 : * directory). This seems to make more sense given that currently the only
90 : * known use of sys.prefix and sys.exec_prefix is for the ILU installation
91 : * process to find the installed Python tree.
92 : */
93 :
94 : #ifdef __cplusplus
95 : extern "C" {
96 : #endif
97 :
98 :
99 : #if !defined(PREFIX) || !defined(EXEC_PREFIX) || !defined(VERSION) || !defined(VPATH)
100 : #error "PREFIX, EXEC_PREFIX, VERSION, and VPATH must be constant defined"
101 : #endif
102 :
103 : #ifndef LANDMARK
104 : #define LANDMARK "os.py"
105 : #endif
106 :
107 : static char prefix[MAXPATHLEN+1];
108 : static char exec_prefix[MAXPATHLEN+1];
109 : static char progpath[MAXPATHLEN+1];
110 : static char *module_search_path = NULL;
111 : static char lib_python[] = "lib/python" VERSION;
112 :
113 : static void
114 6 : reduce(char *dir)
115 : {
116 6 : size_t i = strlen(dir);
117 51 : while (i > 0 && dir[i] != SEP)
118 39 : --i;
119 6 : dir[i] = '\0';
120 6 : }
121 :
122 :
123 : static int
124 9 : isfile(char *filename) /* Is file, not directory */
125 : {
126 : struct stat buf;
127 9 : if (stat(filename, &buf) != 0)
128 0 : return 0;
129 9 : if (!S_ISREG(buf.st_mode))
130 0 : return 0;
131 9 : return 1;
132 : }
133 :
134 :
135 : static int
136 3 : ismodule(char *filename) /* Is module -- check for .pyc/.pyo too */
137 : {
138 3 : if (isfile(filename))
139 3 : return 1;
140 :
141 : /* Check for the compiled version of prefix. */
142 0 : if (strlen(filename) < MAXPATHLEN) {
143 0 : strcat(filename, Py_OptimizeFlag ? "o" : "c");
144 0 : if (isfile(filename))
145 0 : return 1;
146 : }
147 0 : return 0;
148 : }
149 :
150 :
151 : static int
152 0 : isxfile(char *filename) /* Is executable file */
153 : {
154 : struct stat buf;
155 0 : if (stat(filename, &buf) != 0)
156 0 : return 0;
157 0 : if (!S_ISREG(buf.st_mode))
158 0 : return 0;
159 0 : if ((buf.st_mode & 0111) == 0)
160 0 : return 0;
161 0 : return 1;
162 : }
163 :
164 :
165 : static int
166 0 : isdir(char *filename) /* Is directory */
167 : {
168 : struct stat buf;
169 0 : if (stat(filename, &buf) != 0)
170 0 : return 0;
171 0 : if (!S_ISDIR(buf.st_mode))
172 0 : return 0;
173 0 : return 1;
174 : }
175 :
176 :
177 : /* Add a path component, by appending stuff to buffer.
178 : buffer must have at least MAXPATHLEN + 1 bytes allocated, and contain a
179 : NUL-terminated string with no more than MAXPATHLEN characters (not counting
180 : the trailing NUL). It's a fatal error if it contains a string longer than
181 : that (callers must be careful!). If these requirements are met, it's
182 : guaranteed that buffer will still be a NUL-terminated string with no more
183 : than MAXPATHLEN characters at exit. If stuff is too long, only as much of
184 : stuff as fits will be appended.
185 : */
186 : static void
187 24 : joinpath(char *buffer, char *stuff)
188 : {
189 : size_t n, k;
190 24 : if (stuff[0] == SEP)
191 0 : n = 0;
192 : else {
193 24 : n = strlen(buffer);
194 24 : if (n > 0 && buffer[n-1] != SEP && n < MAXPATHLEN)
195 21 : buffer[n++] = SEP;
196 : }
197 24 : if (n > MAXPATHLEN)
198 0 : Py_FatalError("buffer overflow in getpath.c's joinpath()");
199 24 : k = strlen(stuff);
200 24 : if (n + k > MAXPATHLEN)
201 0 : k = MAXPATHLEN - n;
202 24 : strncpy(buffer+n, stuff, k);
203 24 : buffer[n+k] = '\0';
204 24 : }
205 :
206 : /* copy_absolute requires that path be allocated at least
207 : MAXPATHLEN + 1 bytes and that p be no more than MAXPATHLEN bytes. */
208 : static void
209 3 : copy_absolute(char *path, char *p)
210 : {
211 3 : if (p[0] == SEP)
212 0 : strcpy(path, p);
213 : else {
214 3 : if (!getcwd(path, MAXPATHLEN)) {
215 : /* unable to get the current directory */
216 0 : strcpy(path, p);
217 3 : return;
218 : }
219 3 : if (p[0] == '.' && p[1] == SEP)
220 3 : p += 2;
221 3 : joinpath(path, p);
222 : }
223 : }
224 :
225 : /* absolutize() requires that path be allocated at least MAXPATHLEN+1 bytes. */
226 : static void
227 3 : absolutize(char *path)
228 : {
229 : char buffer[MAXPATHLEN + 1];
230 :
231 3 : if (path[0] == SEP)
232 3 : return;
233 3 : copy_absolute(buffer, path);
234 3 : strcpy(path, buffer);
235 : }
236 :
237 : /* search_for_prefix requires that argv0_path be no more than MAXPATHLEN
238 : bytes long.
239 : */
240 : static int
241 3 : search_for_prefix(char *argv0_path, char *home)
242 : {
243 : size_t n;
244 : char *vpath;
245 :
246 : /* If PYTHONHOME is set, we believe it unconditionally */
247 3 : if (home) {
248 : char *delim;
249 0 : strncpy(prefix, home, MAXPATHLEN);
250 0 : delim = strchr(prefix, DELIM);
251 0 : if (delim)
252 0 : *delim = '\0';
253 0 : joinpath(prefix, lib_python);
254 0 : joinpath(prefix, LANDMARK);
255 0 : return 1;
256 : }
257 :
258 : /* Check to see if argv[0] is in the build directory */
259 3 : strcpy(prefix, argv0_path);
260 3 : joinpath(prefix, "Modules/Setup");
261 3 : if (isfile(prefix)) {
262 : /* Check VPATH to see if argv0_path is in the build directory. */
263 3 : vpath = VPATH;
264 3 : strcpy(prefix, argv0_path);
265 3 : joinpath(prefix, vpath);
266 3 : joinpath(prefix, "Lib");
267 3 : joinpath(prefix, LANDMARK);
268 3 : if (ismodule(prefix))
269 3 : return -1;
270 : }
271 :
272 : /* Search from argv0_path, until root is found */
273 0 : copy_absolute(prefix, argv0_path);
274 : do {
275 0 : n = strlen(prefix);
276 0 : joinpath(prefix, lib_python);
277 0 : joinpath(prefix, LANDMARK);
278 0 : if (ismodule(prefix))
279 0 : return 1;
280 0 : prefix[n] = '\0';
281 0 : reduce(prefix);
282 0 : } while (prefix[0]);
283 :
284 : /* Look at configure's PREFIX */
285 0 : strncpy(prefix, PREFIX, MAXPATHLEN);
286 0 : joinpath(prefix, lib_python);
287 0 : joinpath(prefix, LANDMARK);
288 0 : if (ismodule(prefix))
289 0 : return 1;
290 :
291 : /* Fail */
292 0 : return 0;
293 : }
294 :
295 :
296 : /* search_for_exec_prefix requires that argv0_path be no more than
297 : MAXPATHLEN bytes long.
298 : */
299 : static int
300 3 : search_for_exec_prefix(char *argv0_path, char *home)
301 : {
302 : size_t n;
303 :
304 : /* If PYTHONHOME is set, we believe it unconditionally */
305 3 : if (home) {
306 : char *delim;
307 0 : delim = strchr(home, DELIM);
308 0 : if (delim)
309 0 : strncpy(exec_prefix, delim+1, MAXPATHLEN);
310 : else
311 0 : strncpy(exec_prefix, home, MAXPATHLEN);
312 0 : joinpath(exec_prefix, lib_python);
313 0 : joinpath(exec_prefix, "lib-dynload");
314 0 : return 1;
315 : }
316 :
317 : /* Check to see if argv[0] is in the build directory. "pybuilddir.txt"
318 : is written by setup.py and contains the relative path to the location
319 : of shared library modules. */
320 3 : strcpy(exec_prefix, argv0_path);
321 3 : joinpath(exec_prefix, "pybuilddir.txt");
322 3 : if (isfile(exec_prefix)) {
323 3 : FILE *f = fopen(exec_prefix, "r");
324 3 : if (f == NULL)
325 0 : errno = 0;
326 : else {
327 : char rel_builddir_path[MAXPATHLEN+1];
328 : size_t n;
329 3 : n = fread(rel_builddir_path, 1, MAXPATHLEN, f);
330 3 : rel_builddir_path[n] = '\0';
331 3 : fclose(f);
332 3 : strcpy(exec_prefix, argv0_path);
333 3 : joinpath(exec_prefix, rel_builddir_path);
334 3 : return -1;
335 : }
336 : }
337 :
338 : /* Search from argv0_path, until root is found */
339 0 : copy_absolute(exec_prefix, argv0_path);
340 : do {
341 0 : n = strlen(exec_prefix);
342 0 : joinpath(exec_prefix, lib_python);
343 0 : joinpath(exec_prefix, "lib-dynload");
344 0 : if (isdir(exec_prefix))
345 0 : return 1;
346 0 : exec_prefix[n] = '\0';
347 0 : reduce(exec_prefix);
348 0 : } while (exec_prefix[0]);
349 :
350 : /* Look at configure's EXEC_PREFIX */
351 0 : strncpy(exec_prefix, EXEC_PREFIX, MAXPATHLEN);
352 0 : joinpath(exec_prefix, lib_python);
353 0 : joinpath(exec_prefix, "lib-dynload");
354 0 : if (isdir(exec_prefix))
355 0 : return 1;
356 :
357 : /* Fail */
358 0 : return 0;
359 : }
360 :
361 :
362 : static void
363 3 : calculate_path(void)
364 : {
365 : extern char *Py_GetProgramName(void);
366 :
367 : static char delimiter[2] = {DELIM, '\0'};
368 : static char separator[2] = {SEP, '\0'};
369 3 : char *pythonpath = PYTHONPATH;
370 3 : char *rtpypath = Py_GETENV("PYTHONPATH");
371 3 : char *home = Py_GetPythonHome();
372 3 : char *path = getenv("PATH");
373 3 : char *prog = Py_GetProgramName();
374 : char argv0_path[MAXPATHLEN+1];
375 : char zip_path[MAXPATHLEN+1];
376 : int pfound, efound; /* 1 if found; -1 if found build directory */
377 : char *buf;
378 : size_t bufsz;
379 : size_t prefixsz;
380 3 : char *defpath = pythonpath;
381 : #ifdef WITH_NEXT_FRAMEWORK
382 : NSModule pythonModule;
383 : #endif
384 : #ifdef __APPLE__
385 : #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
386 : uint32_t nsexeclength = MAXPATHLEN;
387 : #else
388 : unsigned long nsexeclength = MAXPATHLEN;
389 : #endif
390 : #endif
391 :
392 : /* If there is no slash in the argv0 path, then we have to
393 : * assume python is on the user's $PATH, since there's no
394 : * other way to find a directory to start the search from. If
395 : * $PATH isn't exported, you lose.
396 : */
397 3 : if (strchr(prog, SEP))
398 3 : strncpy(progpath, prog, MAXPATHLEN);
399 : #ifdef __APPLE__
400 : /* On Mac OS X, if a script uses an interpreter of the form
401 : * "#!/opt/python2.3/bin/python", the kernel only passes "python"
402 : * as argv[0], which falls through to the $PATH search below.
403 : * If /opt/python2.3/bin isn't in your path, or is near the end,
404 : * this algorithm may incorrectly find /usr/bin/python. To work
405 : * around this, we can use _NSGetExecutablePath to get a better
406 : * hint of what the intended interpreter was, although this
407 : * will fail if a relative path was used. but in that case,
408 : * absolutize() should help us out below
409 : */
410 : else if(0 == _NSGetExecutablePath(progpath, &nsexeclength) && progpath[0] == SEP)
411 : ;
412 : #endif /* __APPLE__ */
413 0 : else if (path) {
414 : while (1) {
415 0 : char *delim = strchr(path, DELIM);
416 :
417 0 : if (delim) {
418 0 : size_t len = delim - path;
419 0 : if (len > MAXPATHLEN)
420 0 : len = MAXPATHLEN;
421 0 : strncpy(progpath, path, len);
422 0 : *(progpath + len) = '\0';
423 : }
424 : else
425 0 : strncpy(progpath, path, MAXPATHLEN);
426 :
427 0 : joinpath(progpath, prog);
428 0 : if (isxfile(progpath))
429 0 : break;
430 :
431 0 : if (!delim) {
432 0 : progpath[0] = '\0';
433 0 : break;
434 : }
435 0 : path = delim + 1;
436 0 : }
437 : }
438 : else
439 0 : progpath[0] = '\0';
440 3 : if (progpath[0] != SEP && progpath[0] != '\0')
441 3 : absolutize(progpath);
442 3 : strncpy(argv0_path, progpath, MAXPATHLEN);
443 3 : argv0_path[MAXPATHLEN] = '\0';
444 :
445 : #ifdef WITH_NEXT_FRAMEWORK
446 : /* On Mac OS X we have a special case if we're running from a framework.
447 : ** This is because the python home should be set relative to the library,
448 : ** which is in the framework, not relative to the executable, which may
449 : ** be outside of the framework. Except when we're in the build directory...
450 : */
451 : pythonModule = NSModuleForSymbol(NSLookupAndBindSymbol("_Py_Initialize"));
452 : /* Use dylib functions to find out where the framework was loaded from */
453 : buf = (char *)NSLibraryNameForModule(pythonModule);
454 : if (buf != NULL) {
455 : /* We're in a framework. */
456 : /* See if we might be in the build directory. The framework in the
457 : ** build directory is incomplete, it only has the .dylib and a few
458 : ** needed symlinks, it doesn't have the Lib directories and such.
459 : ** If we're running with the framework from the build directory we must
460 : ** be running the interpreter in the build directory, so we use the
461 : ** build-directory-specific logic to find Lib and such.
462 : */
463 : strncpy(argv0_path, buf, MAXPATHLEN);
464 : reduce(argv0_path);
465 : joinpath(argv0_path, lib_python);
466 : joinpath(argv0_path, LANDMARK);
467 : if (!ismodule(argv0_path)) {
468 : /* We are in the build directory so use the name of the
469 : executable - we know that the absolute path is passed */
470 : strncpy(argv0_path, progpath, MAXPATHLEN);
471 : }
472 : else {
473 : /* Use the location of the library as the progpath */
474 : strncpy(argv0_path, buf, MAXPATHLEN);
475 : }
476 : }
477 : #endif
478 :
479 : #if HAVE_READLINK
480 : {
481 : char tmpbuffer[MAXPATHLEN+1];
482 3 : int linklen = readlink(progpath, tmpbuffer, MAXPATHLEN);
483 6 : while (linklen != -1) {
484 : /* It's not null terminated! */
485 0 : tmpbuffer[linklen] = '\0';
486 0 : if (tmpbuffer[0] == SEP)
487 : /* tmpbuffer should never be longer than MAXPATHLEN,
488 : but extra check does not hurt */
489 0 : strncpy(argv0_path, tmpbuffer, MAXPATHLEN);
490 : else {
491 : /* Interpret relative to progpath */
492 0 : reduce(argv0_path);
493 0 : joinpath(argv0_path, tmpbuffer);
494 : }
495 0 : linklen = readlink(argv0_path, tmpbuffer, MAXPATHLEN);
496 : }
497 : }
498 : #endif /* HAVE_READLINK */
499 :
500 3 : reduce(argv0_path);
501 : /* At this point, argv0_path is guaranteed to be less than
502 : MAXPATHLEN bytes long.
503 : */
504 :
505 3 : if (!(pfound = search_for_prefix(argv0_path, home))) {
506 0 : if (!Py_FrozenFlag)
507 0 : fprintf(stderr,
508 : "Could not find platform independent libraries <prefix>\n");
509 0 : strncpy(prefix, PREFIX, MAXPATHLEN);
510 0 : joinpath(prefix, lib_python);
511 : }
512 : else
513 3 : reduce(prefix);
514 :
515 3 : strncpy(zip_path, prefix, MAXPATHLEN);
516 3 : zip_path[MAXPATHLEN] = '\0';
517 3 : if (pfound > 0) { /* Use the reduced prefix returned by Py_GetPrefix() */
518 0 : reduce(zip_path);
519 0 : reduce(zip_path);
520 : }
521 : else
522 3 : strncpy(zip_path, PREFIX, MAXPATHLEN);
523 3 : joinpath(zip_path, "lib/python00.zip");
524 3 : bufsz = strlen(zip_path); /* Replace "00" with version */
525 3 : zip_path[bufsz - 6] = VERSION[0];
526 3 : zip_path[bufsz - 5] = VERSION[2];
527 :
528 3 : if (!(efound = search_for_exec_prefix(argv0_path, home))) {
529 0 : if (!Py_FrozenFlag)
530 0 : fprintf(stderr,
531 : "Could not find platform dependent libraries <exec_prefix>\n");
532 0 : strncpy(exec_prefix, EXEC_PREFIX, MAXPATHLEN);
533 0 : joinpath(exec_prefix, "lib/lib-dynload");
534 : }
535 : /* If we found EXEC_PREFIX do *not* reduce it! (Yet.) */
536 :
537 3 : if ((!pfound || !efound) && !Py_FrozenFlag)
538 0 : fprintf(stderr,
539 : "Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]\n");
540 :
541 : /* Calculate size of return buffer.
542 : */
543 3 : bufsz = 0;
544 :
545 3 : if (rtpypath)
546 0 : bufsz += strlen(rtpypath) + 1;
547 :
548 3 : prefixsz = strlen(prefix) + 1;
549 :
550 : while (1) {
551 12 : char *delim = strchr(defpath, DELIM);
552 :
553 12 : if (defpath[0] != SEP)
554 : /* Paths are relative to prefix */
555 12 : bufsz += prefixsz;
556 :
557 12 : if (delim)
558 9 : bufsz += delim - defpath + 1;
559 : else {
560 3 : bufsz += strlen(defpath) + 1;
561 3 : break;
562 : }
563 9 : defpath = delim + 1;
564 9 : }
565 :
566 3 : bufsz += strlen(zip_path) + 1;
567 3 : bufsz += strlen(exec_prefix) + 1;
568 :
569 : /* This is the only malloc call in this file */
570 3 : buf = (char *)PyMem_Malloc(bufsz);
571 :
572 3 : if (buf == NULL) {
573 : /* We can't exit, so print a warning and limp along */
574 0 : fprintf(stderr, "Not enough memory for dynamic PYTHONPATH.\n");
575 0 : fprintf(stderr, "Using default static PYTHONPATH.\n");
576 0 : module_search_path = PYTHONPATH;
577 : }
578 : else {
579 : /* Run-time value of $PYTHONPATH goes first */
580 3 : if (rtpypath) {
581 0 : strcpy(buf, rtpypath);
582 0 : strcat(buf, delimiter);
583 : }
584 : else
585 3 : buf[0] = '\0';
586 :
587 : /* Next is the default zip path */
588 3 : strcat(buf, zip_path);
589 3 : strcat(buf, delimiter);
590 :
591 : /* Next goes merge of compile-time $PYTHONPATH with
592 : * dynamically located prefix.
593 : */
594 3 : defpath = pythonpath;
595 : while (1) {
596 12 : char *delim = strchr(defpath, DELIM);
597 :
598 12 : if (defpath[0] != SEP) {
599 12 : strcat(buf, prefix);
600 24 : if (prefixsz >= 2 && prefix[prefixsz - 2] != SEP &&
601 12 : defpath[0] != (delim ? DELIM : L'\0')) { /* not empty */
602 9 : strcat(buf, separator);
603 : }
604 : }
605 :
606 12 : if (delim) {
607 9 : size_t len = delim - defpath + 1;
608 9 : size_t end = strlen(buf) + len;
609 9 : strncat(buf, defpath, len);
610 9 : *(buf + end) = '\0';
611 : }
612 : else {
613 3 : strcat(buf, defpath);
614 3 : break;
615 : }
616 9 : defpath = delim + 1;
617 9 : }
618 3 : strcat(buf, delimiter);
619 :
620 : /* Finally, on goes the directory for dynamic-load modules */
621 3 : strcat(buf, exec_prefix);
622 :
623 : /* And publish the results */
624 3 : module_search_path = buf;
625 : }
626 :
627 : /* Reduce prefix and exec_prefix to their essence,
628 : * e.g. /usr/local/lib/python1.5 is reduced to /usr/local.
629 : * If we're loading relative to the build directory,
630 : * return the compiled-in defaults instead.
631 : */
632 3 : if (pfound > 0) {
633 0 : reduce(prefix);
634 0 : reduce(prefix);
635 : /* The prefix is the root directory, but reduce() chopped
636 : * off the "/". */
637 0 : if (!prefix[0])
638 0 : strcpy(prefix, separator);
639 : }
640 : else
641 3 : strncpy(prefix, PREFIX, MAXPATHLEN);
642 :
643 3 : if (efound > 0) {
644 0 : reduce(exec_prefix);
645 0 : reduce(exec_prefix);
646 0 : reduce(exec_prefix);
647 0 : if (!exec_prefix[0])
648 0 : strcpy(exec_prefix, separator);
649 : }
650 : else
651 3 : strncpy(exec_prefix, EXEC_PREFIX, MAXPATHLEN);
652 3 : }
653 :
654 :
655 : /* External interface */
656 :
657 : char *
658 3 : Py_GetPath(void)
659 : {
660 3 : if (!module_search_path)
661 0 : calculate_path();
662 3 : return module_search_path;
663 : }
664 :
665 : char *
666 3 : Py_GetPrefix(void)
667 : {
668 3 : if (!module_search_path)
669 0 : calculate_path();
670 3 : return prefix;
671 : }
672 :
673 : char *
674 3 : Py_GetExecPrefix(void)
675 : {
676 3 : if (!module_search_path)
677 0 : calculate_path();
678 3 : return exec_prefix;
679 : }
680 :
681 : char *
682 3 : Py_GetProgramFullPath(void)
683 : {
684 3 : if (!module_search_path)
685 3 : calculate_path();
686 3 : return progpath;
687 : }
688 :
689 :
690 : #ifdef __cplusplus
691 : }
692 : #endif
693 :
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