106 lines
1.8 KiB
C
106 lines
1.8 KiB
C
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char ftcp_rcs_id[] =
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"$Id: ftcp.c,v 1.1 2002-03-18 20:40:08 hjp Exp $";
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/*
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ftcp - fault tolerant copy
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copy one file to another, ignoring any errors.
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This is useful for copying files from defective media.
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*/
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.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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#include <sys/stat.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#include <ant/io.h>
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#include <ant/string.h>
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char *cmnd;
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off_t skip_size = 512;
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size_t buf_size = 512;
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static void usage(void)
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{
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fprintf(stderr, "Usage: %s [-s skip_size] source dest\n", cmnd);
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exit(1);
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}
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static int ftcp(char const *src, char const *dest)
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{
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int sfd, dfd, count;
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char *buf;
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off_t off = 0;
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if ((buf = malloc(buf_size)) == NULL) {
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return -1;
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}
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sfd = open(src, O_RDONLY);
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if (sfd < 0)
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return -1;
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dfd = open(dest, O_WRONLY|O_CREAT|O_TRUNC, 0666);
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if (dfd < 0)
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{
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close(sfd);
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return -1;
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}
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for (;;) {
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lseek(sfd, off, SEEK_SET);
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count = read(sfd, buf, buf_size);
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switch (count) {
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case -1:
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fprintf(stderr, "%s: error at offset %lu: %s\n",
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cmnd, (unsigned long)off, strerror(errno));
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off += skip_size;
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break;
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case 0:
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goto the_end;
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default:
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lseek(dfd, off, SEEK_SET);
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write(dfd, buf, count);
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off += count;
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}
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}
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the_end:
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close(sfd);
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close(dfd);
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return 0;
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}
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int main(int argc, char **argv)
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{
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int c;
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char *p;
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cmnd = argv[0];
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while ((c = getopt(argc, argv, "s:")) != EOF) {
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switch (c) {
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case 's':
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skip_size = strtoul(optarg, &p, 0);
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if (p == optarg || *p != '\0') usage();
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break;
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case '?':
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usage();
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default:
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assert(0);
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}
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}
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if (optind != argc - 2) {
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usage();
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}
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ftcp(argv[optind], argv[optind+1]);
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return 0;
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}
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