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This commit is contained in:
Glenn L McGrath 2002-11-28 11:05:28 +00:00
parent cdf142af90
commit eaed78a91f
1 changed files with 46 additions and 21 deletions
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67
coreutils/dd.c
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@ -46,12 +46,25 @@ static const struct suffix_mult dd_suffixes[] = {
int dd_main(int argc, char **argv) int dd_main(int argc, char **argv)
{ {
int i, ifd, ofd, oflag, sync_flag = FALSE, trunc = TRUE, noerror = FALSE; size_t out_full = 0;
size_t in_full = 0, in_part = 0, out_full = 0, out_part = 0; size_t out_part = 0;
size_t bs = 512, count = -1; size_t in_full = 0;
size_t in_part = 0;
size_t count = -1;
size_t bs = 512;
ssize_t n; ssize_t n;
off_t seek = 0, skip = 0; off_t seek = 0;
char *infile = NULL, *outfile = NULL, *buf; off_t skip = 0;
int sync_flag = FALSE;
int noerror = FALSE;
int trunc = TRUE;
int oflag;
int ifd;
int ofd;
int i;
char *infile = NULL;
char *outfile = NULL;
char *buf;
for (i = 1; i < argc; i++) { for (i = 1; i < argc; i++) {
if (strncmp("bs=", argv[i], 3) == 0) if (strncmp("bs=", argv[i], 3) == 0)
@ -93,8 +106,9 @@ int dd_main(int argc, char **argv)
buf = xmalloc(bs); buf = xmalloc(bs);
if (infile != NULL) { if (infile != NULL) {
if ((ifd = open(infile, O_RDONLY)) < 0) if ((ifd = open(infile, O_RDONLY)) < 0) {
perror_msg_and_die("%s", infile); perror_msg_and_die("%s", infile);
}
} else { } else {
ifd = STDIN_FILENO; ifd = STDIN_FILENO;
infile = "standard input"; infile = "standard input";
@ -103,35 +117,40 @@ int dd_main(int argc, char **argv)
if (outfile != NULL) { if (outfile != NULL) {
oflag = O_WRONLY | O_CREAT; oflag = O_WRONLY | O_CREAT;
if (!seek && trunc) if (!seek && trunc) {
oflag |= O_TRUNC; oflag |= O_TRUNC;
}
if ((ofd = open(outfile, oflag, 0666)) < 0) if ((ofd = open(outfile, oflag, 0666)) < 0) {
perror_msg_and_die("%s", outfile); perror_msg_and_die("%s", outfile);
}
if (seek && trunc) { if (seek && trunc) {
if (ftruncate(ofd, seek * bs) < 0) { if (ftruncate(ofd, seek * bs) < 0) {
struct stat st; struct stat st;
if (fstat (ofd, &st) < 0 || S_ISREG (st.st_mode) || if (fstat (ofd, &st) < 0 || S_ISREG (st.st_mode) ||
S_ISDIR (st.st_mode)) S_ISDIR (st.st_mode)) {
perror_msg_and_die("%s", outfile); perror_msg_and_die("%s", outfile);
} }
} }
}
} else { } else {
ofd = STDOUT_FILENO; ofd = STDOUT_FILENO;
outfile = "standard output"; outfile = "standard output";
} }
if (skip) { if (skip) {
if (lseek(ifd, skip * bs, SEEK_CUR) < 0) if (lseek(ifd, skip * bs, SEEK_CUR) < 0) {
perror_msg_and_die("%s", infile); perror_msg_and_die("%s", infile);
} }
}
if (seek) { if (seek) {
if (lseek(ofd, seek * bs, SEEK_CUR) < 0) if (lseek(ofd, seek * bs, SEEK_CUR) < 0) {
perror_msg_and_die("%s", outfile); perror_msg_and_die("%s", outfile);
} }
}
while (in_full + in_part != count) { while (in_full + in_part != count) {
if (noerror) { if (noerror) {
@ -147,33 +166,39 @@ int dd_main(int argc, char **argv)
perror_msg_and_die("%s", infile); perror_msg_and_die("%s", infile);
} }
} }
if (n == 0) if (n == 0) {
break; break;
if (n == bs) }
if (n == bs) {
in_full++; in_full++;
else } else {
in_part++; in_part++;
}
if (sync_flag) { if (sync_flag) {
memset(buf + n, '\0', bs - n); memset(buf + n, '\0', bs - n);
n = bs; n = bs;
} }
n = full_write(ofd, buf, n); n = full_write(ofd, buf, n);
if (n < 0) if (n < 0) {
perror_msg_and_die("%s", outfile); perror_msg_and_die("%s", outfile);
if (n == bs) }
if (n == bs) {
out_full++; out_full++;
else } else {
out_part++; out_part++;
} }
}
if (close (ifd) < 0) if (close (ifd) < 0) {
perror_msg_and_die("%s", infile); perror_msg_and_die("%s", infile);
}
if (close (ofd) < 0) if (close (ofd) < 0) {
perror_msg_and_die("%s", outfile); perror_msg_and_die("%s", outfile);
}
fprintf(stderr, "%ld+%ld records in", (long)in_full, (long)in_part); fprintf(stderr, "%ld+%ld records in\n", (long)in_full, (long)in_part);
fprintf(stderr, "%ld+%ld records out", (long)out_full, (long)out_part); fprintf(stderr, "%ld+%ld records out\n", (long)out_full, (long)out_part);
return EXIT_SUCCESS; return EXIT_SUCCESS;
} }