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/*
* Copyright (c) 1998, 1999, 2000, 2002
* Tama Communications Corporation
*
* This file is part of GNU GLOBAL.
*
* GNU GLOBAL 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 2 of the License, or
* (at your option) any later version.
*
* GNU GLOBAL 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; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include "gparam.h"
#include "locatestring.h"
#include "makepath.h"
#include "path.h"
#include "test.h"
#include "strbuf.h"
#include "strlimcpy.h"
#include "usable.h"
#if defined(_WIN32) || defined(__DJGPP__)
static const char *suffix[] = {".exe", ".com", ".bat",};
#endif
/*
* usable: check if command is executable or not.
*
* i) command
* r) ==NULL: not found.
* !=NULL: absolute path of command.
*/
char *
usable(command)
const char *command;
{
STRBUF *sb;
char *p;
const char *dir;
static char path[MAXPATHLEN+1];
#if defined(_WIN32) || defined(__DJGPP__)
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)) {
strlimcpy(path, command, sizeof(path));
return path;
}
return NULL;
}
/*
* If found in BINDIR then use it.
*/
if (test("fx", makepath(BINDIR, command, NULL))) {
strlimcpy(path, makepath(BINDIR, command, NULL), sizeof(path));
return path;
}
/*
* Locate the command for each path in PATH.
*/
*path = 0;
/* Don't use fixed length buffer for environment variable
* because it brings buffer overflow. */
sb = strbuf_open(0);
strbuf_puts(sb, getenv("PATH"));
p = strbuf_value(sb);
while (p) {
dir = p;
if ((p = locatestring(p, PATHSEP, MATCH_FIRST)) != NULL)
*p++ = 0;
if (test("fx", makepath(dir, command, NULL))) {
strlimcpy(path, makepath(dir, command, NULL), sizeof(path));
goto finish;
}
#if defined(_WIN32) || defined(__DJGPP__)
for (i = 0; i < lim; i++)
if (test("f", makepath(dir, command, suffix[i]))) {
strlimcpy(path, makepath(dir, command, suffix[i]), sizeof(path));
goto finish;
}
#endif
}
finish:
strbuf_close(sb);
return *path ? path : NULL;
}
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