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path.c
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1 /*-------------------------------------------------------------------------
2  *
3  * path.c
4  * portable path handling routines
5  *
6  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/port/path.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 
16 #ifndef FRONTEND
17 #include "postgres.h"
18 #else
19 #include "postgres_fe.h"
20 #endif
21 
22 #include <ctype.h>
23 #include <sys/stat.h>
24 #ifdef WIN32
25 #ifdef _WIN32_IE
26 #undef _WIN32_IE
27 #endif
28 #define _WIN32_IE 0x0500
29 #ifdef near
30 #undef near
31 #endif
32 #define near
33 #include <shlobj.h>
34 #else
35 #include <unistd.h>
36 #endif
37 
38 #include "pg_config_paths.h"
39 
40 
41 #ifndef WIN32
42 #define IS_PATH_VAR_SEP(ch) ((ch) == ':')
43 #else
44 #define IS_PATH_VAR_SEP(ch) ((ch) == ';')
45 #endif
46 
47 static void make_relative_path(char *ret_path, const char *target_path,
48  const char *bin_path, const char *my_exec_path);
49 static void trim_directory(char *path);
50 static void trim_trailing_separator(char *path);
51 
52 
53 /*
54  * skip_drive
55  *
56  * On Windows, a path may begin with "C:" or "//network/". Advance over
57  * this and point to the effective start of the path.
58  */
59 #ifdef WIN32
60 
61 static char *
62 skip_drive(const char *path)
63 {
64  if (IS_DIR_SEP(path[0]) && IS_DIR_SEP(path[1]))
65  {
66  path += 2;
67  while (*path && !IS_DIR_SEP(*path))
68  path++;
69  }
70  else if (isalpha((unsigned char) path[0]) && path[1] == ':')
71  {
72  path += 2;
73  }
74  return (char *) path;
75 }
76 #else
77 
78 #define skip_drive(path) (path)
79 #endif
80 
81 /*
82  * has_drive_prefix
83  *
84  * Return true if the given pathname has a drive prefix.
85  */
86 bool
87 has_drive_prefix(const char *path)
88 {
89 #ifdef WIN32
90  return skip_drive(path) != path;
91 #else
92  return false;
93 #endif
94 }
95 
96 /*
97  * first_dir_separator
98  *
99  * Find the location of the first directory separator, return
100  * NULL if not found.
101  */
102 char *
104 {
105  const char *p;
106 
107  for (p = skip_drive(filename); *p; p++)
108  if (IS_DIR_SEP(*p))
109  return (char *) p;
110  return NULL;
111 }
112 
113 /*
114  * first_path_var_separator
115  *
116  * Find the location of the first path separator (i.e. ':' on
117  * Unix, ';' on Windows), return NULL if not found.
118  */
119 char *
120 first_path_var_separator(const char *pathlist)
121 {
122  const char *p;
123 
124  /* skip_drive is not needed */
125  for (p = pathlist; *p; p++)
126  if (IS_PATH_VAR_SEP(*p))
127  return (char *) p;
128  return NULL;
129 }
130 
131 /*
132  * last_dir_separator
133  *
134  * Find the location of the last directory separator, return
135  * NULL if not found.
136  */
137 char *
139 {
140  const char *p,
141  *ret = NULL;
142 
143  for (p = skip_drive(filename); *p; p++)
144  if (IS_DIR_SEP(*p))
145  ret = p;
146  return (char *) ret;
147 }
148 
149 
150 /*
151  * make_native_path - on WIN32, change / to \ in the path
152  *
153  * This effectively undoes canonicalize_path.
154  *
155  * This is required because WIN32 COPY is an internal CMD.EXE
156  * command and doesn't process forward slashes in the same way
157  * as external commands. Quoting the first argument to COPY
158  * does not convert forward to backward slashes, but COPY does
159  * properly process quoted forward slashes in the second argument.
160  *
161  * COPY works with quoted forward slashes in the first argument
162  * only if the current directory is the same as the directory
163  * of the first argument.
164  */
165 void
167 {
168 #ifdef WIN32
169  char *p;
170 
171  for (p = filename; *p; p++)
172  if (*p == '/')
173  *p = '\\';
174 #endif
175 }
176 
177 
178 /*
179  * This function cleans up the paths for use with either cmd.exe or Msys
180  * on Windows. We need them to use filenames without spaces, for which a
181  * short filename is the safest equivalent, eg:
182  * C:/Progra~1/
183  */
184 void
185 cleanup_path(char *path)
186 {
187 #ifdef WIN32
188  char *ptr;
189 
190  /*
191  * GetShortPathName() will fail if the path does not exist, or short names
192  * are disabled on this file system. In both cases, we just return the
193  * original path. This is particularly useful for --sysconfdir, which
194  * might not exist.
195  */
196  GetShortPathName(path, path, MAXPGPATH - 1);
197 
198  /* Replace '\' with '/' */
199  for (ptr = path; *ptr; ptr++)
200  {
201  if (*ptr == '\\')
202  *ptr = '/';
203  }
204 #endif
205 }
206 
207 
208 /*
209  * join_path_components - join two path components, inserting a slash
210  *
211  * We omit the slash if either given component is empty.
212  *
213  * ret_path is the output area (must be of size MAXPGPATH)
214  *
215  * ret_path can be the same as head, but not the same as tail.
216  */
217 void
218 join_path_components(char *ret_path,
219  const char *head, const char *tail)
220 {
221  if (ret_path != head)
222  strlcpy(ret_path, head, MAXPGPATH);
223 
224  /*
225  * Remove any leading "." in the tail component.
226  *
227  * Note: we used to try to remove ".." as well, but that's tricky to get
228  * right; now we just leave it to be done by canonicalize_path() later.
229  */
230  while (tail[0] == '.' && IS_DIR_SEP(tail[1]))
231  tail += 2;
232 
233  if (*tail)
234  {
235  /* only separate with slash if head wasn't empty */
236  snprintf(ret_path + strlen(ret_path), MAXPGPATH - strlen(ret_path),
237  "%s%s",
238  (*(skip_drive(head)) != '\0') ? "/" : "",
239  tail);
240  }
241 }
242 
243 
244 /*
245  * Clean up path by:
246  * o make Win32 path use Unix slashes
247  * o remove trailing quote on Win32
248  * o remove trailing slash
249  * o remove duplicate adjacent separators
250  * o remove trailing '.'
251  * o process trailing '..' ourselves
252  */
253 void
254 canonicalize_path(char *path)
255 {
256  char *p,
257  *to_p;
258  char *spath;
259  bool was_sep = false;
260  int pending_strips;
261 
262 #ifdef WIN32
263 
264  /*
265  * The Windows command processor will accept suitably quoted paths with
266  * forward slashes, but barfs badly with mixed forward and back slashes.
267  */
268  for (p = path; *p; p++)
269  {
270  if (*p == '\\')
271  *p = '/';
272  }
273 
274  /*
275  * In Win32, if you do: prog.exe "a b" "\c\d\" the system will pass \c\d"
276  * as argv[2], so trim off trailing quote.
277  */
278  if (p > path && *(p - 1) == '"')
279  *(p - 1) = '/';
280 #endif
281 
282  /*
283  * Removing the trailing slash on a path means we never get ugly double
284  * trailing slashes. Also, Win32 can't stat() a directory with a trailing
285  * slash. Don't remove a leading slash, though.
286  */
288 
289  /*
290  * Remove duplicate adjacent separators
291  */
292  p = path;
293 #ifdef WIN32
294  /* Don't remove leading double-slash on Win32 */
295  if (*p)
296  p++;
297 #endif
298  to_p = p;
299  for (; *p; p++, to_p++)
300  {
301  /* Handle many adjacent slashes, like "/a///b" */
302  while (*p == '/' && was_sep)
303  p++;
304  if (to_p != p)
305  *to_p = *p;
306  was_sep = (*p == '/');
307  }
308  *to_p = '\0';
309 
310  /*
311  * Remove any trailing uses of "." and process ".." ourselves
312  *
313  * Note that "/../.." should reduce to just "/", while "../.." has to be
314  * kept as-is. In the latter case we put back mistakenly trimmed ".."
315  * components below. Also note that we want a Windows drive spec to be
316  * visible to trim_directory(), but it's not part of the logic that's
317  * looking at the name components; hence distinction between path and
318  * spath.
319  */
320  spath = skip_drive(path);
321  pending_strips = 0;
322  for (;;)
323  {
324  int len = strlen(spath);
325 
326  if (len >= 2 && strcmp(spath + len - 2, "/.") == 0)
327  trim_directory(path);
328  else if (strcmp(spath, ".") == 0)
329  {
330  /* Want to leave "." alone, but "./.." has to become ".." */
331  if (pending_strips > 0)
332  *spath = '\0';
333  break;
334  }
335  else if ((len >= 3 && strcmp(spath + len - 3, "/..") == 0) ||
336  strcmp(spath, "..") == 0)
337  {
338  trim_directory(path);
339  pending_strips++;
340  }
341  else if (pending_strips > 0 && *spath != '\0')
342  {
343  /* trim a regular directory name canceled by ".." */
344  trim_directory(path);
345  pending_strips--;
346  /* foo/.. should become ".", not empty */
347  if (*spath == '\0')
348  strcpy(spath, ".");
349  }
350  else
351  break;
352  }
353 
354  if (pending_strips > 0)
355  {
356  /*
357  * We could only get here if path is now totally empty (other than a
358  * possible drive specifier on Windows). We have to put back one or
359  * more ".."'s that we took off.
360  */
361  while (--pending_strips > 0)
362  strcat(path, "../");
363  strcat(path, "..");
364  }
365 }
366 
367 /*
368  * Detect whether a path contains any parent-directory references ("..")
369  *
370  * The input *must* have been put through canonicalize_path previously.
371  *
372  * This is a bit tricky because we mustn't be fooled by "..a.." (legal)
373  * nor "C:.." (legal on Unix but not Windows).
374  */
375 bool
377 {
378  int path_len;
379 
380  path = skip_drive(path); /* C: shouldn't affect our conclusion */
381 
382  path_len = strlen(path);
383 
384  /*
385  * ".." could be the whole path; otherwise, if it's present it must be at
386  * the beginning, in the middle, or at the end.
387  */
388  if (strcmp(path, "..") == 0 ||
389  strncmp(path, "../", 3) == 0 ||
390  strstr(path, "/../") != NULL ||
391  (path_len >= 3 && strcmp(path + path_len - 3, "/..") == 0))
392  return true;
393 
394  return false;
395 }
396 
397 /*
398  * Detect whether a path is only in or below the current working directory.
399  * An absolute path that matches the current working directory should
400  * return false (we only want relative to the cwd). We don't allow
401  * "/../" even if that would keep us under the cwd (it is too hard to
402  * track that).
403  */
404 bool
406 {
407  if (is_absolute_path(path))
408  return false;
409  /* don't allow anything above the cwd */
410  else if (path_contains_parent_reference(path))
411  return false;
412 #ifdef WIN32
413 
414  /*
415  * On Win32, a drive letter _not_ followed by a slash, e.g. 'E:abc', is
416  * relative to the cwd on that drive, or the drive's root directory if
417  * that drive has no cwd. Because the path itself cannot tell us which is
418  * the case, we have to assume the worst, i.e. that it is not below the
419  * cwd. We could use GetFullPathName() to find the full path but that
420  * could change if the current directory for the drive changes underneath
421  * us, so we just disallow it.
422  */
423  else if (isalpha((unsigned char) path[0]) && path[1] == ':' &&
424  !IS_DIR_SEP(path[2]))
425  return false;
426 #endif
427  else
428  return true;
429 }
430 
431 /*
432  * Detect whether path1 is a prefix of path2 (including equality).
433  *
434  * This is pretty trivial, but it seems better to export a function than
435  * to export IS_DIR_SEP.
436  */
437 bool
438 path_is_prefix_of_path(const char *path1, const char *path2)
439 {
440  int path1_len = strlen(path1);
441 
442  if (strncmp(path1, path2, path1_len) == 0 &&
443  (IS_DIR_SEP(path2[path1_len]) || path2[path1_len] == '\0'))
444  return true;
445  return false;
446 }
447 
448 /*
449  * Extracts the actual name of the program as called -
450  * stripped of .exe suffix if any
451  */
452 const char *
453 get_progname(const char *argv0)
454 {
455  const char *nodir_name;
456  char *progname;
457 
458  nodir_name = last_dir_separator(argv0);
459  if (nodir_name)
460  nodir_name++;
461  else
462  nodir_name = skip_drive(argv0);
463 
464  /*
465  * Make a copy in case argv[0] is modified by ps_status. Leaks memory, but
466  * called only once.
467  */
468  progname = strdup(nodir_name);
469  if (progname == NULL)
470  {
471  fprintf(stderr, "%s: out of memory\n", nodir_name);
472  abort(); /* This could exit the postmaster */
473  }
474 
475 #if defined(__CYGWIN__) || defined(WIN32)
476  /* strip ".exe" suffix, regardless of case */
477  if (strlen(progname) > sizeof(EXE) - 1 &&
478  pg_strcasecmp(progname + strlen(progname) - (sizeof(EXE) - 1), EXE) == 0)
479  progname[strlen(progname) - (sizeof(EXE) - 1)] = '\0';
480 #endif
481 
482  return progname;
483 }
484 
485 
486 /*
487  * dir_strcmp: strcmp except any two DIR_SEP characters are considered equal,
488  * and we honor filesystem case insensitivity if known
489  */
490 static int
491 dir_strcmp(const char *s1, const char *s2)
492 {
493  while (*s1 && *s2)
494  {
495  if (
496 #ifndef WIN32
497  *s1 != *s2
498 #else
499  /* On windows, paths are case-insensitive */
500  pg_tolower((unsigned char) *s1) != pg_tolower((unsigned char) *s2)
501 #endif
502  && !(IS_DIR_SEP(*s1) && IS_DIR_SEP(*s2)))
503  return (int) *s1 - (int) *s2;
504  s1++, s2++;
505  }
506  if (*s1)
507  return 1; /* s1 longer */
508  if (*s2)
509  return -1; /* s2 longer */
510  return 0;
511 }
512 
513 
514 /*
515  * make_relative_path - make a path relative to the actual binary location
516  *
517  * This function exists to support relocation of installation trees.
518  *
519  * ret_path is the output area (must be of size MAXPGPATH)
520  * target_path is the compiled-in path to the directory we want to find
521  * bin_path is the compiled-in path to the directory of executables
522  * my_exec_path is the actual location of my executable
523  *
524  * We determine the common prefix of target_path and bin_path, then compare
525  * the remainder of bin_path to the last directory component(s) of
526  * my_exec_path. If they match, build the result as the part of my_exec_path
527  * preceding the match, joined to the remainder of target_path. If no match,
528  * return target_path as-is.
529  *
530  * For example:
531  * target_path = '/usr/local/share/postgresql'
532  * bin_path = '/usr/local/bin'
533  * my_exec_path = '/opt/pgsql/bin/postmaster'
534  * Given these inputs, the common prefix is '/usr/local/', the tail of
535  * bin_path is 'bin' which does match the last directory component of
536  * my_exec_path, so we would return '/opt/pgsql/share/postgresql'
537  */
538 static void
539 make_relative_path(char *ret_path, const char *target_path,
540  const char *bin_path, const char *my_exec_path)
541 {
542  int prefix_len;
543  int tail_start;
544  int tail_len;
545  int i;
546 
547  /*
548  * Determine the common prefix --- note we require it to end on a
549  * directory separator, consider eg '/usr/lib' and '/usr/libexec'.
550  */
551  prefix_len = 0;
552  for (i = 0; target_path[i] && bin_path[i]; i++)
553  {
554  if (IS_DIR_SEP(target_path[i]) && IS_DIR_SEP(bin_path[i]))
555  prefix_len = i + 1;
556  else if (target_path[i] != bin_path[i])
557  break;
558  }
559  if (prefix_len == 0)
560  goto no_match; /* no common prefix? */
561  tail_len = strlen(bin_path) - prefix_len;
562 
563  /*
564  * Set up my_exec_path without the actual executable name, and
565  * canonicalize to simplify comparison to bin_path.
566  */
567  strlcpy(ret_path, my_exec_path, MAXPGPATH);
568  trim_directory(ret_path); /* remove my executable name */
569  canonicalize_path(ret_path);
570 
571  /*
572  * Tail match?
573  */
574  tail_start = (int) strlen(ret_path) - tail_len;
575  if (tail_start > 0 &&
576  IS_DIR_SEP(ret_path[tail_start - 1]) &&
577  dir_strcmp(ret_path + tail_start, bin_path + prefix_len) == 0)
578  {
579  ret_path[tail_start] = '\0';
580  trim_trailing_separator(ret_path);
581  join_path_components(ret_path, ret_path, target_path + prefix_len);
582  canonicalize_path(ret_path);
583  return;
584  }
585 
586 no_match:
587  strlcpy(ret_path, target_path, MAXPGPATH);
588  canonicalize_path(ret_path);
589 }
590 
591 
592 /*
593  * make_absolute_path
594  *
595  * If the given pathname isn't already absolute, make it so, interpreting
596  * it relative to the current working directory.
597  *
598  * Also canonicalizes the path. The result is always a malloc'd copy.
599  *
600  * In backend, failure cases result in ereport(ERROR); in frontend,
601  * we write a complaint on stderr and return NULL.
602  *
603  * Note: interpretation of relative-path arguments during postmaster startup
604  * should happen before doing ChangeToDataDir(), else the user will probably
605  * not like the results.
606  */
607 char *
608 make_absolute_path(const char *path)
609 {
610  char *new;
611 
612  /* Returning null for null input is convenient for some callers */
613  if (path == NULL)
614  return NULL;
615 
616  if (!is_absolute_path(path))
617  {
618  char *buf;
619  size_t buflen;
620 
621  buflen = MAXPGPATH;
622  for (;;)
623  {
624  buf = malloc(buflen);
625  if (!buf)
626  {
627 #ifndef FRONTEND
628  ereport(ERROR,
629  (errcode(ERRCODE_OUT_OF_MEMORY),
630  errmsg("out of memory")));
631 #else
632  fprintf(stderr, _("out of memory\n"));
633  return NULL;
634 #endif
635  }
636 
637  if (getcwd(buf, buflen))
638  break;
639  else if (errno == ERANGE)
640  {
641  free(buf);
642  buflen *= 2;
643  continue;
644  }
645  else
646  {
647  int save_errno = errno;
648 
649  free(buf);
650  errno = save_errno;
651 #ifndef FRONTEND
652  elog(ERROR, "could not get current working directory: %m");
653 #else
654  fprintf(stderr, _("could not get current working directory: %s\n"),
655  strerror(errno));
656  return NULL;
657 #endif
658  }
659  }
660 
661  new = malloc(strlen(buf) + strlen(path) + 2);
662  if (!new)
663  {
664  free(buf);
665 #ifndef FRONTEND
666  ereport(ERROR,
667  (errcode(ERRCODE_OUT_OF_MEMORY),
668  errmsg("out of memory")));
669 #else
670  fprintf(stderr, _("out of memory\n"));
671  return NULL;
672 #endif
673  }
674  sprintf(new, "%s/%s", buf, path);
675  free(buf);
676  }
677  else
678  {
679  new = strdup(path);
680  if (!new)
681  {
682 #ifndef FRONTEND
683  ereport(ERROR,
684  (errcode(ERRCODE_OUT_OF_MEMORY),
685  errmsg("out of memory")));
686 #else
687  fprintf(stderr, _("out of memory\n"));
688  return NULL;
689 #endif
690  }
691  }
692 
693  /* Make sure punctuation is canonical, too */
694  canonicalize_path(new);
695 
696  return new;
697 }
698 
699 
700 /*
701  * get_share_path
702  */
703 void
704 get_share_path(const char *my_exec_path, char *ret_path)
705 {
706  make_relative_path(ret_path, PGSHAREDIR, PGBINDIR, my_exec_path);
707 }
708 
709 /*
710  * get_etc_path
711  */
712 void
713 get_etc_path(const char *my_exec_path, char *ret_path)
714 {
715  make_relative_path(ret_path, SYSCONFDIR, PGBINDIR, my_exec_path);
716 }
717 
718 /*
719  * get_include_path
720  */
721 void
722 get_include_path(const char *my_exec_path, char *ret_path)
723 {
724  make_relative_path(ret_path, INCLUDEDIR, PGBINDIR, my_exec_path);
725 }
726 
727 /*
728  * get_pkginclude_path
729  */
730 void
731 get_pkginclude_path(const char *my_exec_path, char *ret_path)
732 {
733  make_relative_path(ret_path, PKGINCLUDEDIR, PGBINDIR, my_exec_path);
734 }
735 
736 /*
737  * get_includeserver_path
738  */
739 void
740 get_includeserver_path(const char *my_exec_path, char *ret_path)
741 {
742  make_relative_path(ret_path, INCLUDEDIRSERVER, PGBINDIR, my_exec_path);
743 }
744 
745 /*
746  * get_lib_path
747  */
748 void
749 get_lib_path(const char *my_exec_path, char *ret_path)
750 {
751  make_relative_path(ret_path, LIBDIR, PGBINDIR, my_exec_path);
752 }
753 
754 /*
755  * get_pkglib_path
756  */
757 void
758 get_pkglib_path(const char *my_exec_path, char *ret_path)
759 {
760  make_relative_path(ret_path, PKGLIBDIR, PGBINDIR, my_exec_path);
761 }
762 
763 /*
764  * get_locale_path
765  */
766 void
767 get_locale_path(const char *my_exec_path, char *ret_path)
768 {
769  make_relative_path(ret_path, LOCALEDIR, PGBINDIR, my_exec_path);
770 }
771 
772 /*
773  * get_doc_path
774  */
775 void
776 get_doc_path(const char *my_exec_path, char *ret_path)
777 {
778  make_relative_path(ret_path, DOCDIR, PGBINDIR, my_exec_path);
779 }
780 
781 /*
782  * get_html_path
783  */
784 void
785 get_html_path(const char *my_exec_path, char *ret_path)
786 {
787  make_relative_path(ret_path, HTMLDIR, PGBINDIR, my_exec_path);
788 }
789 
790 /*
791  * get_man_path
792  */
793 void
794 get_man_path(const char *my_exec_path, char *ret_path)
795 {
796  make_relative_path(ret_path, MANDIR, PGBINDIR, my_exec_path);
797 }
798 
799 
800 /*
801  * get_home_path
802  *
803  * On Unix, this actually returns the user's home directory. On Windows
804  * it returns the PostgreSQL-specific application data folder.
805  */
806 bool
807 get_home_path(char *ret_path)
808 {
809 #ifndef WIN32
810  char pwdbuf[BUFSIZ];
811  struct passwd pwdstr;
812  struct passwd *pwd = NULL;
813 
814  (void) pqGetpwuid(geteuid(), &pwdstr, pwdbuf, sizeof(pwdbuf), &pwd);
815  if (pwd == NULL)
816  return false;
817  strlcpy(ret_path, pwd->pw_dir, MAXPGPATH);
818  return true;
819 #else
820  char *tmppath;
821 
822  /*
823  * Note: We use getenv() here because the more modern SHGetFolderPath()
824  * would force the backend to link with shell32.lib, which eats valuable
825  * desktop heap. XXX This function is used only in psql, which already
826  * brings in shell32 via libpq. Moving this function to its own file
827  * would keep it out of the backend, freeing it from this concern.
828  */
829  tmppath = getenv("APPDATA");
830  if (!tmppath)
831  return false;
832  snprintf(ret_path, MAXPGPATH, "%s/postgresql", tmppath);
833  return true;
834 #endif
835 }
836 
837 
838 /*
839  * get_parent_directory
840  *
841  * Modify the given string in-place to name the parent directory of the
842  * named file.
843  *
844  * If the input is just a file name with no directory part, the result is
845  * an empty string, not ".". This is appropriate when the next step is
846  * join_path_components(), but might need special handling otherwise.
847  *
848  * Caution: this will not produce desirable results if the string ends
849  * with "..". For most callers this is not a problem since the string
850  * is already known to name a regular file. If in doubt, apply
851  * canonicalize_path() first.
852  */
853 void
855 {
856  trim_directory(path);
857 }
858 
859 
860 /*
861  * trim_directory
862  *
863  * Trim trailing directory from path, that is, remove any trailing slashes,
864  * the last pathname component, and the slash just ahead of it --- but never
865  * remove a leading slash.
866  */
867 static void
868 trim_directory(char *path)
869 {
870  char *p;
871 
872  path = skip_drive(path);
873 
874  if (path[0] == '\0')
875  return;
876 
877  /* back up over trailing slash(es) */
878  for (p = path + strlen(path) - 1; IS_DIR_SEP(*p) && p > path; p--)
879  ;
880  /* back up over directory name */
881  for (; !IS_DIR_SEP(*p) && p > path; p--)
882  ;
883  /* if multiple slashes before directory name, remove 'em all */
884  for (; p > path && IS_DIR_SEP(*(p - 1)); p--)
885  ;
886  /* don't erase a leading slash */
887  if (p == path && IS_DIR_SEP(*p))
888  p++;
889  *p = '\0';
890 }
891 
892 
893 /*
894  * trim_trailing_separator
895  *
896  * trim off trailing slashes, but not a leading slash
897  */
898 static void
900 {
901  char *p;
902 
903  path = skip_drive(path);
904  p = path + strlen(path);
905  if (p > path)
906  for (p--; p > path && IS_DIR_SEP(*p); p--)
907  *p = '\0';
908 }
void get_pkglib_path(const char *my_exec_path, char *ret_path)
Definition: path.c:758
void get_pkginclude_path(const char *my_exec_path, char *ret_path)
Definition: path.c:731
void cleanup_path(char *path)
Definition: path.c:185
static char * argv0
Definition: pg_ctl.c:101
const char * get_progname(const char *argv0)
Definition: path.c:453
void canonicalize_path(char *path)
Definition: path.c:254
static void trim_directory(char *path)
Definition: path.c:868
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Definition: path.c:749
#define skip_drive(path)
Definition: path.c:78
void make_native_path(char *filename)
Definition: path.c:166
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Definition: path.c:87
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Definition: pgstrcasecmp.c:122
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Definition: elog.c:575
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int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
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Definition: path.c:438
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Definition: pgstrcasecmp.c:36
const char * progname
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Definition: path.c:405
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Definition: path.c:854
#define IS_DIR_SEP(ch)
Definition: port.h:75
#define malloc(a)
Definition: header.h:50
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Definition: path.c:704
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Definition: path.c:376
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Definition: path.c:807
#define ERROR
Definition: elog.h:43
char * s1
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Definition: path.c:767
#define MAXPGPATH
void get_html_path(const char *my_exec_path, char *ret_path)
Definition: path.c:785
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Definition: path.c:120
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Definition: path.c:138
static char * buf
Definition: pg_test_fsync.c:66
#define is_absolute_path(filename)
Definition: port.h:77
static void make_relative_path(char *ret_path, const char *target_path, const char *bin_path, const char *my_exec_path)
Definition: path.c:539
#define ereport(elevel, rest)
Definition: elog.h:122
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Definition: path.c:794
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Definition: path.c:722
char my_exec_path[MAXPGPATH]
Definition: globals.c:64
char * s2
#define IS_PATH_VAR_SEP(ch)
Definition: path.c:42
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Definition: path.c:899
static int dir_strcmp(const char *s1, const char *s2)
Definition: path.c:491
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Definition: path.c:218
#define free(a)
Definition: header.h:65
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45
#define NULL
Definition: c.h:229
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Definition: path.c:776
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Definition: elog.c:797
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Definition: initdb.c:225
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const char * strerror(int errnum)
Definition: strerror.c:19
#define EXE
Definition: port.h:113
#define elog
Definition: elog.h:219
#define _(x)
Definition: elog.c:84