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/* Locating a program in PATH.
Copyright (C) 2001-2003, 2009-2020 Free Software Foundation, Inc.
Written by Bruno Haible <haible@clisp.cons.org>, 2001.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef _FINDPROG_H
#define _FINDPROG_H
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Looks up a program in the PATH.
Attempts to determine the pathname that would be called by execlp/execvp
of PROGNAME. If successful, it returns a pathname containing a slash
(either absolute or relative to the current directory). Otherwise, it
returns PROGNAME unmodified.
Because of the latter case, callers should use execlp/execvp, not
execl/execv on the returned pathname.
The returned string is freshly malloc()ed if it is != PROGNAME. */
extern const char *find_in_path (const char *progname);
/* Looks up a program in the given PATH-like string.
The PATH argument consists of a list of directories, separated by ':' or
(on native Windows) by ';'. An empty PATH element designates the current
directory. A null PATH is equivalent to an empty PATH, that is, to the
singleton list that contains only the current directory.
Determines the pathname that would be called by execlp/execvp of PROGNAME.
- If successful, it returns a pathname containing a slash (either absolute
or relative to the current directory). The returned string can be used
with either execl/execv or execlp/execvp. It is freshly malloc()ed if it
is != PROGNAME.
- Otherwise, it sets errno and returns NULL.
Specific errno values include:
- ENOENT: means that the program's file was not found.
- EACCES: means that the program's file cannot be accessed (due to some
issue with one of the ancestor directories) or lacks the execute
permissions.
If OPTIMIZE_FOR_EXEC is true, the function saves some work, under the
assumption that the resulting pathname will not be accessed directly,
only through execl/execv or execlp/execvp.
Here, a "slash" means:
- On POSIX systems excluding Cygwin: a '/',
- On Windows, OS/2, DOS platforms: a '/' or '\'. */
extern const char *find_in_given_path (const char *progname, const char *path,
bool optimize_for_exec);
#ifdef __cplusplus
}
#endif
#endif /* _FINDPROG_H */
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