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/* Locating a program in PATH.
Copyright (C) 2001-2004, 2006-2025 Free Software Foundation, Inc.
Written by Bruno Haible <haible@clisp.cons.org>, 2001.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "findprog.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if !(defined _WIN32 || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__)
# include <sys/stat.h>
#endif
/* Avoid collision between findprog.c and findprog-lgpl.c. */
#if IN_FINDPROG_LGPL || ! GNULIB_FINDPROG_LGPL
#if !IN_FINDPROG_LGPL
# include "xalloc.h"
#endif
#include "concat-filename.h"
const char *
find_in_path (const char *progname)
{
#if defined _WIN32 || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
/* Native Windows, Cygwin, OS/2, DOS */
/* The searching rules with .COM, .EXE, .BAT, .CMD etc. suffixes are
too complicated. Leave it to the OS. */
return progname;
#else
/* Unix */
char *path;
char *path_rest;
char *cp;
if (strchr (progname, '/') != NULL)
/* If progname contains a slash, it is either absolute or relative to
the current directory. PATH is not used. */
return progname;
path = getenv ("PATH");
if (path == NULL || *path == '\0')
/* If PATH is not set, the default search path is implementation
dependent. */
return progname;
/* Make a copy, to prepare for destructive modifications. */
# if !IN_FINDPROG_LGPL
path = xstrdup (path);
# else
path = strdup (path);
if (path == NULL)
/* Out of memory. */
return progname;
# endif
for (path_rest = path; ; path_rest = cp + 1)
{
const char *dir;
bool last;
char *progpathname;
/* Extract next directory in PATH. */
dir = path_rest;
for (cp = path_rest; *cp != '\0' && *cp != ':'; cp++)
;
last = (*cp == '\0');
*cp = '\0';
/* Empty PATH components designate the current directory. */
if (dir == cp)
dir = ".";
/* Concatenate dir and progname. */
# if !IN_FINDPROG_LGPL
progpathname = xconcatenated_filename (dir, progname, NULL);
# else
progpathname = concatenated_filename (dir, progname, NULL);
if (progpathname == NULL)
{
/* Out of memory. */
free (path);
return progname;
}
# endif
/* On systems which have the eaccess() system call, let's use it.
On other systems, let's hope that this program is not installed
setuid or setgid, so that it is ok to call access() despite its
design flaw. */
if (eaccess (progpathname, X_OK) == 0)
{
/* Check that the progpathname does not point to a directory. */
struct stat statbuf;
if (stat (progpathname, &statbuf) >= 0
&& ! S_ISDIR (statbuf.st_mode))
{
/* Found! */
if (strcmp (progpathname, progname) == 0)
{
free (progpathname);
/* Add the "./" prefix for real, that xconcatenated_filename()
optimized away. This avoids a second PATH search when the
caller uses execlp/execvp. */
# if !IN_FINDPROG_LGPL
progpathname = XNMALLOC (2 + strlen (progname) + 1, char);
# else
progpathname = (char *) malloc (2 + strlen (progname) + 1);
if (progpathname == NULL)
{
/* Out of memory. */
free (path);
return progname;
}
# endif
progpathname[0] = '.';
progpathname[1] = '/';
memcpy (progpathname + 2, progname, strlen (progname) + 1);
}
free (path);
return progpathname;
}
}
free (progpathname);
if (last)
break;
}
/* Not found in PATH. An error will be signalled at the first call. */
free (path);
return progname;
#endif
}
#endif
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