Mercurial > hg > octave-kai > gnulib-hg
annotate lib/findprog.c @ 9309:bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Sun, 07 Oct 2007 19:14:58 +0200 |
| parents | 1e16373508e1 |
| children | f0a681493fa6 |
| rev | line source |
|---|---|
| 4294 | 1 /* Locating a program in PATH. |
|
8251
1e16373508e1
Rename module 'pathname' to 'filename'.
Bruno Haible <bruno@clisp.org>
parents:
7603
diff
changeset
|
2 Copyright (C) 2001-2004, 2006-2007 Free Software Foundation, Inc. |
| 4294 | 3 Written by Bruno Haible <haible@clisp.cons.org>, 2001. |
| 4 | |
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9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8251
diff
changeset
|
5 This program is free software: you can redistribute it and/or modify |
| 4294 | 6 it under the terms of the GNU General Public License as published by |
|
9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8251
diff
changeset
|
7 the Free Software Foundation; either version 3 of the License, or |
|
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8251
diff
changeset
|
8 (at your option) any later version. |
| 4294 | 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 | |
|
9309
bbbbbf4cd1c5
Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
8251
diff
changeset
|
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 4294 | 17 |
| 18 | |
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1c4ed7637c24
Include <config.h> unconditionally.
Bruno Haible <bruno@clisp.org>
parents:
6751
diff
changeset
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19 #include <config.h> |
| 4294 | 20 |
| 21 /* Specification. */ | |
| 22 #include "findprog.h" | |
| 23 | |
| 24 #include <stdbool.h> | |
| 25 #include <stdlib.h> | |
| 26 #include <string.h> | |
|
6751
1b0092424a44
Include <unistd.h> unconditionally.
Bruno Haible <bruno@clisp.org>
parents:
6259
diff
changeset
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27 #include <unistd.h> |
| 4294 | 28 |
| 29 #include "xalloc.h" | |
|
8251
1e16373508e1
Rename module 'pathname' to 'filename'.
Bruno Haible <bruno@clisp.org>
parents:
7603
diff
changeset
|
30 #include "filename.h" |
| 4294 | 31 |
| 32 | |
| 33 const char * | |
| 34 find_in_path (const char *progname) | |
| 35 { | |
|
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eebff8c51a9b
Treat Cygwin like Windows regarding pathname syntax.
Bruno Haible <bruno@clisp.org>
parents:
4294
diff
changeset
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36 #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
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37 /* Win32, Cygwin, OS/2, DOS */ |
| 4294 | 38 /* The searching rules with .COM, .EXE, .BAT, .CMD etc. suffixes are |
| 39 too complicated. Leave it to the OS. */ | |
| 40 return progname; | |
| 41 #else | |
| 42 /* Unix */ | |
| 43 char *path; | |
| 7527 | 44 char *path_rest; |
| 4294 | 45 char *cp; |
| 46 | |
| 47 if (strchr (progname, '/') != NULL) | |
| 48 /* If progname contains a slash, it is either absolute or relative to | |
| 49 the current directory. PATH is not used. */ | |
| 50 return progname; | |
| 51 | |
| 52 path = getenv ("PATH"); | |
| 53 if (path == NULL || *path == '\0') | |
| 54 /* If PATH is not set, the default search path is implementation | |
| 55 dependent. */ | |
| 56 return progname; | |
| 57 | |
| 58 /* Make a copy, to prepare for destructive modifications. */ | |
| 59 path = xstrdup (path); | |
| 7527 | 60 for (path_rest = path; ; path_rest = cp + 1) |
| 4294 | 61 { |
| 7527 | 62 const char *dir; |
| 4294 | 63 bool last; |
| 64 char *progpathname; | |
| 65 | |
| 66 /* Extract next directory in PATH. */ | |
| 7527 | 67 dir = path_rest; |
| 68 for (cp = path_rest; *cp != '\0' && *cp != ':'; cp++) | |
| 4294 | 69 ; |
| 70 last = (*cp == '\0'); | |
| 71 *cp = '\0'; | |
| 72 | |
| 73 /* Empty PATH components designate the current directory. */ | |
| 74 if (dir == cp) | |
| 75 dir = "."; | |
| 76 | |
| 77 /* Concatenate dir and progname. */ | |
|
8251
1e16373508e1
Rename module 'pathname' to 'filename'.
Bruno Haible <bruno@clisp.org>
parents:
7603
diff
changeset
|
78 progpathname = concatenated_filename (dir, progname, NULL); |
| 4294 | 79 |
| 80 /* On systems which have the eaccess() system call, let's use it. | |
| 81 On other systems, let's hope that this program is not installed | |
| 82 setuid or setgid, so that it is ok to call access() despite its | |
| 83 design flaw. */ | |
| 84 if (eaccess (progpathname, X_OK) == 0) | |
| 85 { | |
| 86 /* Found! */ | |
| 87 if (strcmp (progpathname, progname) == 0) | |
| 88 { | |
| 89 free (progpathname); | |
| 90 | |
|
8251
1e16373508e1
Rename module 'pathname' to 'filename'.
Bruno Haible <bruno@clisp.org>
parents:
7603
diff
changeset
|
91 /* Add the "./" prefix for real, that concatenated_filename() |
| 4294 | 92 optimized away. This avoids a second PATH search when the |
| 93 caller uses execlp/execvp. */ | |
|
7603
23f14c284219
Simplify xmalloc expressions. Add overflow check in xmalloc arguments.
Bruno Haible <bruno@clisp.org>
parents:
7586
diff
changeset
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94 progpathname = XNMALLOC (2 + strlen (progname) + 1, char); |
| 4294 | 95 progpathname[0] = '.'; |
| 96 progpathname[1] = '/'; | |
| 97 memcpy (progpathname + 2, progname, strlen (progname) + 1); | |
| 98 } | |
| 99 | |
| 100 free (path); | |
| 101 return progpathname; | |
| 102 } | |
| 103 | |
| 104 free (progpathname); | |
| 105 | |
| 106 if (last) | |
| 107 break; | |
| 108 } | |
| 109 | |
| 110 /* Not found in PATH. An error will be signalled at the first call. */ | |
| 111 free (path); | |
| 112 return progname; | |
| 113 #endif | |
| 114 } |