Mercurial > hg > octave-kai > gnulib-hg
annotate lib/findprog.c @ 7586:4a8b5467d8b2
Make it compile in C++ mode.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Tue, 31 Oct 2006 19:18:54 +0000 |
| parents | c15258519e7c |
| children | 23f14c284219 |
| rev | line source |
|---|---|
| 4294 | 1 /* Locating a program in PATH. |
|
6751
1b0092424a44
Include <unistd.h> unconditionally.
Bruno Haible <bruno@clisp.org>
parents:
6259
diff
changeset
|
2 Copyright (C) 2001-2004, 2006 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, | |
|
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*** empty log message ***
Paul Eggert <eggert@cs.ucla.edu>
parents:
5053
diff
changeset
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 4294 | 18 |
| 19 | |
|
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1c4ed7637c24
Include <config.h> unconditionally.
Bruno Haible <bruno@clisp.org>
parents:
6751
diff
changeset
|
20 #include <config.h> |
| 4294 | 21 |
| 22 /* Specification. */ | |
| 23 #include "findprog.h" | |
| 24 | |
| 25 #include <stdbool.h> | |
| 26 #include <stdlib.h> | |
| 27 #include <string.h> | |
|
6751
1b0092424a44
Include <unistd.h> unconditionally.
Bruno Haible <bruno@clisp.org>
parents:
6259
diff
changeset
|
28 #include <unistd.h> |
| 4294 | 29 |
| 30 #include "xalloc.h" | |
| 31 #include "pathname.h" | |
| 32 | |
| 33 | |
| 34 const char * | |
| 35 find_in_path (const char *progname) | |
| 36 { | |
|
5053
eebff8c51a9b
Treat Cygwin like Windows regarding pathname syntax.
Bruno Haible <bruno@clisp.org>
parents:
4294
diff
changeset
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37 #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
|
38 /* Win32, Cygwin, OS/2, DOS */ |
| 4294 | 39 /* The searching rules with .COM, .EXE, .BAT, .CMD etc. suffixes are |
| 40 too complicated. Leave it to the OS. */ | |
| 41 return progname; | |
| 42 #else | |
| 43 /* Unix */ | |
| 44 char *path; | |
| 7527 | 45 char *path_rest; |
| 4294 | 46 char *cp; |
| 47 | |
| 48 if (strchr (progname, '/') != NULL) | |
| 49 /* If progname contains a slash, it is either absolute or relative to | |
| 50 the current directory. PATH is not used. */ | |
| 51 return progname; | |
| 52 | |
| 53 path = getenv ("PATH"); | |
| 54 if (path == NULL || *path == '\0') | |
| 55 /* If PATH is not set, the default search path is implementation | |
| 56 dependent. */ | |
| 57 return progname; | |
| 58 | |
| 59 /* Make a copy, to prepare for destructive modifications. */ | |
| 60 path = xstrdup (path); | |
| 7527 | 61 for (path_rest = path; ; path_rest = cp + 1) |
| 4294 | 62 { |
| 7527 | 63 const char *dir; |
| 4294 | 64 bool last; |
| 65 char *progpathname; | |
| 66 | |
| 67 /* Extract next directory in PATH. */ | |
| 7527 | 68 dir = path_rest; |
| 69 for (cp = path_rest; *cp != '\0' && *cp != ':'; cp++) | |
| 4294 | 70 ; |
| 71 last = (*cp == '\0'); | |
| 72 *cp = '\0'; | |
| 73 | |
| 74 /* Empty PATH components designate the current directory. */ | |
| 75 if (dir == cp) | |
| 76 dir = "."; | |
| 77 | |
| 78 /* Concatenate dir and progname. */ | |
| 79 progpathname = concatenated_pathname (dir, progname, NULL); | |
| 80 | |
| 81 /* On systems which have the eaccess() system call, let's use it. | |
| 82 On other systems, let's hope that this program is not installed | |
| 83 setuid or setgid, so that it is ok to call access() despite its | |
| 84 design flaw. */ | |
| 85 if (eaccess (progpathname, X_OK) == 0) | |
| 86 { | |
| 87 /* Found! */ | |
| 88 if (strcmp (progpathname, progname) == 0) | |
| 89 { | |
| 90 free (progpathname); | |
| 91 | |
| 92 /* Add the "./" prefix for real, that concatenated_pathname() | |
| 93 optimized away. This avoids a second PATH search when the | |
| 94 caller uses execlp/execvp. */ | |
|
7586
4a8b5467d8b2
Make it compile in C++ mode.
Bruno Haible <bruno@clisp.org>
parents:
7527
diff
changeset
|
95 progpathname = (char *) xmalloc (2 + strlen (progname) + 1); |
| 4294 | 96 progpathname[0] = '.'; |
| 97 progpathname[1] = '/'; | |
| 98 memcpy (progpathname + 2, progname, strlen (progname) + 1); | |
| 99 } | |
| 100 | |
| 101 free (path); | |
| 102 return progpathname; | |
| 103 } | |
| 104 | |
| 105 free (progpathname); | |
| 106 | |
| 107 if (last) | |
| 108 break; | |
| 109 } | |
| 110 | |
| 111 /* Not found in PATH. An error will be signalled at the first call. */ | |
| 112 free (path); | |
| 113 return progname; | |
| 114 #endif | |
| 115 } |