150 lines
3.3 KiB
C
150 lines
3.3 KiB
C
/*
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fstabinfo.c
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Gets information about /etc/fstab.
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Copyright 2007 Gentoo Foundation
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*/
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#include <errno.h>
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#include <getopt.h>
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#include <libgen.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* Yay for linux and it's non liking of POSIX functions.
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Okay, we could use getfsent but the man page says use getmntent instead
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AND we don't have getfsent on uclibc or dietlibc for some odd reason. */
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#ifdef __linux__
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#define HAVE_GETMNTENT
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#include <mntent.h>
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#define GET_ENT getmntent (fp)
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#define GET_ENT_FILE(_name) getmntfile (fp, _name)
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#define END_ENT endmntent (fp)
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#define ENT_DEVICE(_ent) ent->mnt_fsname
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#define ENT_FILE(_ent) ent->mnt_dir
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#define ENT_TYPE(_ent) ent->mnt_type
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#define ENT_OPTS(_ent) ent->mnt_opts
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#define ENT_PASS(_ent) ent->mnt_passno
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#else
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#define HAVE_GETFSENT
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#include <fstab.h>
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#define GET_ENT getfsent ()
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#define GET_ENT_FILE(_name) getfsfile (_name)
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#define END_ENT endfsent ()
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#define ENT_DEVICE(_ent) ent->fs_spec
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#define ENT_TYPE(_ent) ent->fs_vfstype
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#define ENT_FILE(_ent) ent->fs_file
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#define ENT_OPTS(_ent) ent->fs_mntops
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#define ENT_PASS(_ent) ent->fs_passno
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#endif
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#include "einfo.h"
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#ifdef HAVE_GETMNTENT
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static struct mntent *getmntfile (FILE *fp, const char *file)
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{
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struct mntent *ent;
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while ((ent = getmntent (fp)))
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if (strcmp (file, ent->mnt_dir) == 0)
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return (ent);
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return (NULL);
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}
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#endif
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int main (int argc, char **argv)
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{
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#ifdef HAVE_GETMNTENT
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FILE *fp;
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struct mntent *ent;
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#else
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struct fstab *ent;
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#endif
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int result = EXIT_FAILURE;
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char *token;
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int n = 0;
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char c;
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static struct option longopts[] = {
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{ "fstype", 1, NULL, 'f'},
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{ "mountcmd", 1, NULL, 'm'},
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{ "opts", 1, NULL, 'o'},
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{ "passno", 1, NULL, 'p'},
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{ NULL, 0, NULL, 0}
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};
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while ((c = getopt_long (argc, argv, "f:m:o:p:",
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longopts, (int *) 0)) != -1)
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{
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#ifdef HAVE_GETMNTENT
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fp = setmntent ("/etc/fstab", "r");
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#endif
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switch (c) {
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case 'f':
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while ((token = strsep (&optarg, ",")))
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while ((ent = GET_ENT))
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if (strcmp (token, ENT_TYPE (ent)) == 0)
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printf ("%s\n", ENT_FILE (ent));
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result = EXIT_SUCCESS;
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break;
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case 'm':
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if ((ent = GET_ENT_FILE (optarg))) {
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printf ("-o %s -t %s %s %s\n", ENT_OPTS (ent), ENT_TYPE (ent),
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ENT_DEVICE (ent), ENT_FILE (ent));
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result = EXIT_SUCCESS;
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}
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break;
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case 'o':
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if ((ent = GET_ENT_FILE (optarg))) {
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printf ("%s\n", ENT_OPTS (ent));
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result = EXIT_SUCCESS;
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}
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break;
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case 'p':
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switch (optarg[0]) {
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case '=':
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case '<':
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case '>':
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if (sscanf (optarg + 1, "%d", &n) != 1)
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eerrorx ("%s: invalid passno %s", argv[0], optarg + 1);
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while ((ent = GET_ENT)) {
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if (((optarg[0] == '=' && n == ENT_PASS (ent)) ||
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(optarg[0] == '<' && n > ENT_PASS (ent)) ||
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(optarg[0] == '>' && n < ENT_PASS (ent))) &&
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strcmp (ENT_FILE (ent), "none") != 0)
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{
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printf ("%s\n", ENT_FILE (ent));
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result = EXIT_SUCCESS;
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}
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}
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break;
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default:
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if ((ent = GET_ENT_FILE (optarg))) {
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printf ("%d\n", ENT_PASS (ent));
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result = EXIT_SUCCESS;
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}
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break;
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}
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default:
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END_ENT;
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exit (EXIT_FAILURE);
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}
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END_ENT;
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if (result != EXIT_SUCCESS)
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break;
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}
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exit (result);
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}
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