mirror of
https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
synced 2024-12-12 11:23:32 +08:00
45e338f533
In case you're wondering about whether this change is safe from a portability standpoint, fear not. This has been beaten to death in other forums. Here are a few threads: http://thread.gmane.org/gmane.comp.version-control.git/74187 http://thread.gmane.org/gmane.comp.lib.gnulib.bugs/12712 http://thread.gmane.org/gmane.emacs.devel/98144 http://thread.gmane.org/gmane.comp.lib.glibc.alpha/13092 There has been debate about whether it's a good idea from a performance standpoint, too, but imho you'll have a hard time finding an instance where this sort of change induces a measurable performance penalty. If you do, please let me know. Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
389 lines
6.5 KiB
C
389 lines
6.5 KiB
C
/*
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* e2initrd_helper.c - Get the filesystem table
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*
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* Copyright 2004 by Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <unistd.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include <ctype.h>
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#include <string.h>
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#include <time.h>
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <utime.h>
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#else
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extern int optind;
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extern char *optarg;
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#endif
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#include "ext2fs/ext2_fs.h"
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#include "ext2fs/ext2fs.h"
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#include "blkid/blkid.h"
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#include "../version.h"
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#include "nls-enable.h"
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const char * program_name = "get_fstab";
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char * device_name;
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static int open_flag;
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static int root_type;
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static blkid_cache cache = NULL;
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struct mem_file {
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char *buf;
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int size;
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int ptr;
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};
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struct fs_info {
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char *device;
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char *mountpt;
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char *type;
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char *opts;
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int freq;
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int passno;
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int flags;
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struct fs_info *next;
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};
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static void usage(void)
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{
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fprintf(stderr,
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_("Usage: %s -r device\n"), program_name);
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exit (1);
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}
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static errcode_t get_file(ext2_filsys fs, const char * filename,
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struct mem_file *ret_file)
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{
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errcode_t retval;
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char *buf;
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ext2_file_t e2_file;
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unsigned int got;
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struct ext2_inode inode;
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ext2_ino_t ino;
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ret_file->buf = 0;
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ret_file->size = 0;
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ret_file->ptr = 0;
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retval = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO,
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filename, &ino);
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if (retval)
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return retval;
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retval = ext2fs_read_inode(fs, ino, &inode);
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if (retval)
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return retval;
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if (inode.i_size_high || (inode.i_size > 65536))
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return EFBIG;
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buf = malloc(inode.i_size + 1);
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if (!buf)
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return ENOMEM;
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memset(buf, 0, inode.i_size+1);
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retval = ext2fs_file_open(fs, ino, 0, &e2_file);
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if (retval)
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return retval;
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retval = ext2fs_file_read(e2_file, buf, inode.i_size, &got);
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if (retval)
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goto errout;
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retval = ext2fs_file_close(e2_file);
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if (retval)
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return retval;
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ret_file->buf = buf;
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ret_file->size = (int) got;
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errout:
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ext2fs_file_close(e2_file);
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return retval;
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}
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static char *get_line(struct mem_file *file)
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{
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char *cp, *ret;
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int s = 0;
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cp = file->buf + file->ptr;
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while (*cp && *cp != '\n') {
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cp++;
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s++;
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}
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ret = malloc(s+1);
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if (!ret)
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return 0;
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ret[s]=0;
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memcpy(ret, file->buf + file->ptr, s);
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while (*cp && (*cp == '\n' || *cp == '\r')) {
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cp++;
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s++;
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}
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file->ptr += s;
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return ret;
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}
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static int mem_file_eof(struct mem_file *file)
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{
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return (file->ptr >= file->size);
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}
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/*
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* fstab parsing code
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*/
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static char *string_copy(const char *s)
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{
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char *ret;
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if (!s)
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return 0;
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ret = malloc(strlen(s)+1);
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if (ret)
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strcpy(ret, s);
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return ret;
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}
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static char *skip_over_blank(char *cp)
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{
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while (*cp && isspace(*cp))
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cp++;
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return cp;
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}
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static char *skip_over_word(char *cp)
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{
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while (*cp && !isspace(*cp))
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cp++;
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return cp;
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}
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static char *parse_word(char **buf)
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{
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char *word, *next;
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word = *buf;
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if (*word == 0)
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return 0;
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word = skip_over_blank(word);
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next = skip_over_word(word);
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if (*next)
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*next++ = 0;
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*buf = next;
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return word;
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}
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static void parse_escape(char *word)
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{
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char *p, *q;
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int ac, i;
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if (!word)
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return;
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for (p = word, q = word; *p; p++, q++) {
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*q = *p;
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if (*p != '\\')
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continue;
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if (*++p == 0)
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break;
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if (*p == 't') {
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*q = '\t';
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continue;
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}
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if (*p == 'n') {
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*q = '\n';
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continue;
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}
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if (!isdigit(*p)) {
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*q = *p;
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continue;
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}
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ac = 0;
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for (i = 0; i < 3; i++, p++) {
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if (!isdigit(*p))
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break;
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ac = (ac * 8) + (*p - '0');
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}
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*q = ac;
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p--;
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}
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*q = 0;
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}
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static int parse_fstab_line(char *line, struct fs_info *fs)
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{
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char *dev, *device, *mntpnt, *type, *opts, *freq, *passno, *cp;
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if ((cp = strchr(line, '#')))
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*cp = 0; /* Ignore everything after the comment char */
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cp = line;
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device = parse_word(&cp);
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mntpnt = parse_word(&cp);
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type = parse_word(&cp);
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opts = parse_word(&cp);
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freq = parse_word(&cp);
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passno = parse_word(&cp);
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if (!device)
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return -1; /* Allow blank lines */
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if (!mntpnt || !type)
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return -1;
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parse_escape(device);
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parse_escape(mntpnt);
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parse_escape(type);
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parse_escape(opts);
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parse_escape(freq);
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parse_escape(passno);
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dev = blkid_get_devname(cache, device, NULL);
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if (dev)
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device = dev;
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if (strchr(type, ','))
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type = 0;
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fs->device = string_copy(device);
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fs->mountpt = string_copy(mntpnt);
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fs->type = string_copy(type);
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fs->opts = string_copy(opts ? opts : "");
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fs->freq = freq ? atoi(freq) : -1;
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fs->passno = passno ? atoi(passno) : -1;
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fs->flags = 0;
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fs->next = NULL;
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free(dev);
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return 0;
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}
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static void free_fstab_line(struct fs_info *fs)
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{
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if (fs->device)
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fs->device = 0;
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if (fs->mountpt)
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fs->mountpt = 0;
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if (fs->type)
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fs->type = 0;
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if (fs->opts)
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fs->opts = 0;
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memset(fs, 0, sizeof(struct fs_info));
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}
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static void PRS(int argc, char **argv)
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{
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int c;
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#ifdef ENABLE_NLS
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setlocale(LC_MESSAGES, "");
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setlocale(LC_CTYPE, "");
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bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
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textdomain(NLS_CAT_NAME);
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#endif
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while ((c = getopt(argc, argv, "rv")) != EOF) {
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switch (c) {
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case 'r':
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root_type++;
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break;
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case 'v':
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printf("%s %s (%s)\n", program_name,
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E2FSPROGS_VERSION, E2FSPROGS_DATE);
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break;
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default:
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usage();
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}
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}
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if (optind < argc - 1 || optind == argc)
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usage();
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device_name = blkid_get_devname(NULL, argv[optind], NULL);
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if (!device_name) {
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com_err("tune2fs", 0, _("Unable to resolve '%s'"),
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argv[optind]);
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exit(1);
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}
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}
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static void get_root_type(ext2_filsys fs)
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{
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errcode_t retval;
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struct mem_file file;
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char *buf;
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struct fs_info fs_info;
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int ret;
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retval = get_file(fs, "/etc/fstab", &file);
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while (!mem_file_eof(&file)) {
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buf = get_line(&file);
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if (!buf)
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continue;
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ret = parse_fstab_line(buf, &fs_info);
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if (ret < 0)
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goto next_line;
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if (!strcmp(fs_info.mountpt, "/"))
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printf("%s\n", fs_info.type);
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free_fstab_line(&fs_info);
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next_line:
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free(buf);
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}
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}
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int main (int argc, char ** argv)
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{
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errcode_t retval;
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ext2_filsys fs;
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io_manager io_ptr;
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add_error_table(&et_ext2_error_table);
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blkid_get_cache(&cache, NULL);
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PRS(argc, argv);
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#ifdef CONFIG_TESTIO_DEBUG
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if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
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io_ptr = test_io_manager;
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test_io_backing_manager = unix_io_manager;
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} else
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#endif
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io_ptr = unix_io_manager;
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retval = ext2fs_open (device_name, open_flag, 0, 0, io_ptr, &fs);
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if (retval)
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exit(1);
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if (root_type)
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get_root_type(fs);
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remove_error_table(&et_ext2_error_table);
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return (ext2fs_close (fs) ? 1 : 0);
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}
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