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/*
* Copyright (c) 1996, 1997, 1998, 1999
* Shigio Yamaguchi. All rights reserved.
* Copyright (c) 1999
* Tama Communications Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Tama Communications
* Corporation and its contributors.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* usable.c 26-Aug-99
*
*/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "gparam.h"
#include "locatestring.h"
#include "makepath.h"
#include "path.h"
#include "test.h"
#include "usable.h"
#ifdef _WIN32
static const char *suffix[] = {".exe", ".com", ".bat",};
#endif
/*
* usable: check if command is executable or not.
*
* i) command
* r) 1: executable
* 0: non executable
*/
char *
usable(command)
char *command;
{
char buf[MAXENVLEN+1], *p, *dir;
static char path[MAXPATHLEN+1];
#ifdef _WIN32
int i, lim = sizeof(suffix)/sizeof(char *);
#endif
if (isabspath(command) || locatestring(command, "./", MATCH_AT_FIRST)
|| locatestring(command, "../", MATCH_AT_FIRST)) {
if (test("fx", command)) {
strcpy(path, command);
return path;
}
return NULL;
}
strcpy(buf, getenv("PATH"));
p = buf;
while (p) {
dir = p;
if ((p = locatestring(p, PATHSEP, MATCH_FIRST)) != NULL)
*p++ = 0;
if (test("fx", makepath(dir, command, NULL))) {
strcpy(path, makepath(dir, command, NULL));
return path;
}
#if defined(_WIN32)
for (i = 0; i < lim; i++)
if (test("f", makepath(dir, command, suffix[i]))) {
strcpy(path, makepath(dir, command, suffix[i]));
return path;
}
#endif
}
return NULL;
}
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