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51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "libdisk.h"
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void *
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read_block(int fd, daddr_t block, u_long sector_size)
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{
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void *foo;
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int i;
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foo = malloc(sector_size);
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if (foo == NULL)
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return (NULL);
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if (-1 == lseek(fd, (off_t)block * sector_size, SEEK_SET)) {
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free (foo);
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return (NULL);
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}
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i = read(fd, foo, sector_size);
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if ((int)sector_size != i) {
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free (foo);
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return (NULL);
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}
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return foo;
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}
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int
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write_block(int fd, daddr_t block, const void *foo, u_long sector_size)
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{
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int i;
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if (-1 == lseek(fd, (off_t)block * sector_size, SEEK_SET))
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return (-1);
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i = write(fd, foo, sector_size);
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if ((int)sector_size != i)
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return (-1);
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return 0;
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}
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