mirror of https://github.com/vitalif/e2fsprogs
73 lines
1.3 KiB
C
73 lines
1.3 KiB
C
/*
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* fstype.c
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*
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* Copyright (C) 2001 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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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <sys/types.h>
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struct fs_magic {
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const char *fs_name;
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int offset;
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int len;
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char *magic;
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};
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struct fs_magic type_array[] = {
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{ "ext2", 1024+56, 2, "\123\357" },
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{ "minix", 1040, 2, "\177\023" },
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{ "minix", 1040, 2, "\217\023" },
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{ "minix", 1040, 2, "\150\044" },
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{ "minix", 1040, 2, "\170\044" },
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{ "xfs", 0, 4, "XFSB" },
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{ 0, 0, 0, 0 }
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};
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const char *identify_fs(const char *fs_name)
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{
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char buf[2048];
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struct fs_magic *p;
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int fd;
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fd = open(fs_name, O_RDONLY);
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if (fd < 0)
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return NULL;
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if (lseek(fd, 0, SEEK_SET) < 0)
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return NULL;
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if (read(fd, buf, sizeof(buf)) != sizeof(buf))
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return NULL;
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for (p = type_array; p->fs_name; p++) {
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if (memcmp(p->magic, buf+p->offset, p->len) == 0)
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return p->fs_name;
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}
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return NULL;
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}
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#ifdef TEST_PROGRAM
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int main(int argc, char **argv)
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{
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const char *type;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s device\n", argv[0]);
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exit(1);
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}
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type = identify_fs(argv[1]);
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printf("%s is a %s filesystem\n", argv[1], type);
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return (0);
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}
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#endif
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