Mercurial > hg > octave-kai > gnulib-hg
annotate lib/findprog.c @ 5848:a48fb0e98c8c
*** empty log message ***
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Sat, 14 May 2005 06:03:57 +0000 |
| parents | eebff8c51a9b |
| children | 96c32553b4c6 |
| rev | line source |
|---|---|
| 4294 | 1 /* Locating a program in PATH. |
|
5053
eebff8c51a9b
Treat Cygwin like Windows regarding pathname syntax.
Bruno Haible <bruno@clisp.org>
parents:
4294
diff
changeset
|
2 Copyright (C) 2001-2004 Free Software Foundation, Inc. |
| 4294 | 3 Written by Bruno Haible <haible@clisp.cons.org>, 2001. |
| 4 | |
| 5 This program is free software; you can redistribute it and/or modify | |
| 6 it under the terms of the GNU General Public License as published by | |
| 7 the Free Software Foundation; either version 2, or (at your option) | |
| 8 any later version. | |
| 9 | |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program; if not, write to the Free Software Foundation, | |
|
5848
a48fb0e98c8c
*** empty log message ***
Paul Eggert <eggert@cs.ucla.edu>
parents:
5053
diff
changeset
|
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 4294 | 18 |
| 19 | |
| 20 #ifdef HAVE_CONFIG_H | |
| 21 # include "config.h" | |
| 22 #endif | |
| 23 | |
| 24 /* Specification. */ | |
| 25 #include "findprog.h" | |
| 26 | |
| 27 #include <stdbool.h> | |
| 28 #include <stdlib.h> | |
| 29 #include <string.h> | |
| 30 | |
| 31 #ifdef HAVE_UNISTD_H | |
| 32 # include <unistd.h> | |
| 33 #endif | |
| 34 | |
| 35 #include "xalloc.h" | |
| 36 #include "pathname.h" | |
| 37 | |
| 38 | |
| 39 const char * | |
| 40 find_in_path (const char *progname) | |
| 41 { | |
|
5053
eebff8c51a9b
Treat Cygwin like Windows regarding pathname syntax.
Bruno Haible <bruno@clisp.org>
parents:
4294
diff
changeset
|
42 #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ |
|
eebff8c51a9b
Treat Cygwin like Windows regarding pathname syntax.
Bruno Haible <bruno@clisp.org>
parents:
4294
diff
changeset
|
43 /* Win32, Cygwin, OS/2, DOS */ |
| 4294 | 44 /* The searching rules with .COM, .EXE, .BAT, .CMD etc. suffixes are |
| 45 too complicated. Leave it to the OS. */ | |
| 46 return progname; | |
| 47 #else | |
| 48 /* Unix */ | |
| 49 char *path; | |
| 50 char *dir; | |
| 51 char *cp; | |
| 52 | |
| 53 if (strchr (progname, '/') != NULL) | |
| 54 /* If progname contains a slash, it is either absolute or relative to | |
| 55 the current directory. PATH is not used. */ | |
| 56 return progname; | |
| 57 | |
| 58 path = getenv ("PATH"); | |
| 59 if (path == NULL || *path == '\0') | |
| 60 /* If PATH is not set, the default search path is implementation | |
| 61 dependent. */ | |
| 62 return progname; | |
| 63 | |
| 64 /* Make a copy, to prepare for destructive modifications. */ | |
| 65 path = xstrdup (path); | |
| 66 for (dir = path; ; dir = cp + 1) | |
| 67 { | |
| 68 bool last; | |
| 69 char *progpathname; | |
| 70 | |
| 71 /* Extract next directory in PATH. */ | |
| 72 for (cp = dir; *cp != '\0' && *cp != ':'; cp++) | |
| 73 ; | |
| 74 last = (*cp == '\0'); | |
| 75 *cp = '\0'; | |
| 76 | |
| 77 /* Empty PATH components designate the current directory. */ | |
| 78 if (dir == cp) | |
| 79 dir = "."; | |
| 80 | |
| 81 /* Concatenate dir and progname. */ | |
| 82 progpathname = concatenated_pathname (dir, progname, NULL); | |
| 83 | |
| 84 /* On systems which have the eaccess() system call, let's use it. | |
| 85 On other systems, let's hope that this program is not installed | |
| 86 setuid or setgid, so that it is ok to call access() despite its | |
| 87 design flaw. */ | |
| 88 if (eaccess (progpathname, X_OK) == 0) | |
| 89 { | |
| 90 /* Found! */ | |
| 91 if (strcmp (progpathname, progname) == 0) | |
| 92 { | |
| 93 free (progpathname); | |
| 94 | |
| 95 /* Add the "./" prefix for real, that concatenated_pathname() | |
| 96 optimized away. This avoids a second PATH search when the | |
| 97 caller uses execlp/execvp. */ | |
| 98 progpathname = xmalloc (2 + strlen (progname) + 1); | |
| 99 progpathname[0] = '.'; | |
| 100 progpathname[1] = '/'; | |
| 101 memcpy (progpathname + 2, progname, strlen (progname) + 1); | |
| 102 } | |
| 103 | |
| 104 free (path); | |
| 105 return progpathname; | |
| 106 } | |
| 107 | |
| 108 free (progpathname); | |
| 109 | |
| 110 if (last) | |
| 111 break; | |
| 112 } | |
| 113 | |
| 114 /* Not found in PATH. An error will be signalled at the first call. */ | |
| 115 free (path); | |
| 116 return progname; | |
| 117 #endif | |
| 118 } |