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/*
* Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sysexits.h>
#define FSTYP_PREFIX "fstyp_"
#define MAX_PATH_LEN 80
#define MAX_CMD_LEN (MAX_PATH_LEN * 2)
#define NULL_REDIRECTION ">/dev/null 2>&1"
void usage(void);
int select_fstyp(const struct dirent * dp);
int test(const char *dir, const struct dirent * dp, const char *dev);
void dealloc(struct dirent ** dpp, int numElems);
char *progname;
/*
* The fstyp command iterates through the binary directories to look for
* commands of the form fstyp_* and runs them, trying to find one that
* matches the given device. Once one of the returns success, fstyp
* prints out that file system type name and terminates. 1 is returned
* if any match is found, and 0 is returned if no match is found.
*/
int
main(int argc, char *argv[])
{
/* NULL-terminated list of directories to search for fstyp_* commands */
const char *DIRS[] = { "/bin/",
"/sbin/",
"/usr/bin/",
"/usr/sbin/",
"/usr/local/bin/",
"/usr/local/sbin/",
NULL};
int numMatches, i, j, found;
struct stat sb;
struct dirent **dpp;
numMatches = 0;
i = 0;
j = 0;
found = 0;
if ((progname = strrchr(*argv, '/')))
++progname;
else
progname = *argv;
if (argc != 2) {
usage();
return EX_USAGE;
}
if (0 == stat(argv[1], &sb)) {
for (i = 0; (!found && (NULL != DIRS[i])); i++) {
/*
* scan DIRS[i] for files that start with
* "fstyp_"
*/
numMatches = scandir(DIRS[i], &dpp, select_fstyp, NULL);
if (numMatches >= 0) {
for (j = 0; (!found && (j < numMatches)); j++) {
if (test(DIRS[i], dpp[j], argv[1]) == 1) {
puts(dpp[j]->d_name + 6);
found = 1;
}
}
dealloc(dpp, numMatches);
dpp = NULL;
}
}
}
return found;
}
int
select_fstyp(const struct dirent * dp)
{
return ((dp != NULL) &&
((dp->d_type == DT_REG) || (dp->d_type == DT_LNK)) &&
(dp->d_namlen > strlen(FSTYP_PREFIX)) &&
(!strncmp(FSTYP_PREFIX, dp->d_name, strlen(FSTYP_PREFIX))));
}
/* return dp if successful, else return NULL */
int
test(const char *dir, const struct dirent * dp, const char *dev)
{
char cmd[MAX_CMD_LEN + 1] = {0};
int status;
FILE *fileptr;
status = 0;
/* + 1 for white space */
if ((strlen(dir) + dp->d_namlen + 1 + strlen(dev) +
strlen(NULL_REDIRECTION)) > MAX_CMD_LEN) {
return 0;
}
snprintf(cmd, sizeof(cmd), "%s%s %s", dir, dp->d_name, dev);
if ((fileptr = popen(cmd, "r")) != NULL) {
status = pclose(fileptr);
if (WIFEXITED(status)) {
if (WEXITSTATUS(status) == 1) {
return 1;
}
}
}
return 0;
}
void
dealloc(struct dirent ** dpp, int numElems)
{
int i;
for (i = 0; i < numElems; i++) {
free(dpp[i]);
dpp[i] = NULL;
}
free(dpp);
return;
}
void
usage(void)
{
fprintf(stdout, "usage: %s device\n", progname);
return;
}
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