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83 lines
1.5 KiB
83 lines
1.5 KiB
/*
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* extend.c --- extend a file so that it has at least a specified
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* number of blocks.
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*
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* Copyright (C) 1993, 1994, 1995 Theodore Ts'o.
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*
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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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*/
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#include "config.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include "../misc/nls-enable.h"
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static void usage(char *progname)
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{
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fprintf(stderr, _("%s: %s filename nblocks blocksize\n"),
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progname, progname);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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char *filename;
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int nblocks, blocksize;
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int fd;
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char *block;
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int ret;
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if (argc != 4)
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usage(argv[0]);
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filename = argv[1];
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nblocks = strtoul(argv[2], 0, 0) - 1;
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blocksize = strtoul(argv[3], 0, 0);
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if (nblocks < 0) {
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fprintf(stderr, _("Illegal number of blocks!\n"));
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exit(1);
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}
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block = malloc(blocksize);
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if (block == 0) {
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fprintf(stderr, _("Couldn't allocate block buffer (size=%d)\n"),
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blocksize);
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exit(1);
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}
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memset(block, 0, blocksize);
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fd = open(filename, O_RDWR);
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if (fd < 0) {
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perror(filename);
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exit(1);
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}
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ret = lseek(fd, nblocks*blocksize, SEEK_SET);
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if (ret < 0) {
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perror("lseek");
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exit(1);
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}
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ret = read(fd, block, blocksize);
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if (ret < 0) {
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perror("read");
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exit(1);
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}
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ret = lseek(fd, nblocks*blocksize, SEEK_SET);
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if (ret < 0) {
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perror("lseek #2");
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exit(1);
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}
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ret = write(fd, block, blocksize);
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if (ret < 0) {
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perror("read");
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exit(1);
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}
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exit(0);
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}
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