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/*
* Copyright (C) 2010 Cyril Hrubis chrubis@suse.cz
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
*/
/*
* Looks for binary prog_name in $PATH.
*
* If such file exists and if you are able at least to read it, zero is
* returned and absolute path to the file is filled into buf. In case buf is
* too short to hold the absolute path + prog_name for the file we are looking
* for -1 is returned as well as when there is no such file in all paths in
* $PATH.
*/
#include "test.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#define MIN(a, b) ((a)<(b)?(a):(b))
static int file_exist(const char *path)
{
struct stat st;
if (!access(path, R_OK) && !stat(path, &st) && S_ISREG(st.st_mode))
return 1;
return 0;
}
int tst_get_path(const char *prog_name, char *buf, size_t buf_len)
{
const char *path = (const char*) getenv("PATH");
const char *start = path;
const char *end;
size_t size, ret;
if (path == NULL)
return -1;
do {
end = strchr(start, ':');
if (end != NULL)
snprintf(buf, MIN(buf_len, (size_t)(end - start + 1)), "%s", start);
else
snprintf(buf, buf_len, "%s", start);
size = strlen(buf);
/*
* "::" inside $PATH, $PATH ending with ':' or $PATH starting
* with ':' should be expanded into current working directory.
*/
if (size == 0) {
snprintf(buf, buf_len, ".");
size = strlen(buf);
}
/*
* If there is no '/' ad the end of path from $PATH add it.
*/
if (buf[size - 1] != '/')
ret = snprintf(buf + size, buf_len - size, "/%s", prog_name);
else
ret = snprintf(buf + size, buf_len - size, "%s", prog_name);
if (buf_len - size > ret && file_exist(buf))
return 0;
start = end + 1;
} while (end != NULL);
return -1;
}
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