/*
* Mini dd implementation for busybox
*
- * Copyright (C) 1999, 2000 by Lineo, inc.
- * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
- * Based in part on code taken from sash.
- * Copyright (c) 1999 by David I. Bell
- * Permission is granted to use, distribute, or modify this source,
- * provided that this copyright notice remains intact.
- *
- * Permission to distribute this code under the GPL has been granted.
+ * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*
*/
+#include "busybox.h"
-#include "internal.h"
-#include <features.h>
-#include <stdio.h>
+#include <sys/types.h>
#include <fcntl.h>
-#include <errno.h>
-#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
-#include <inttypes.h>
-#else
-typedef unsigned long long int uintmax_t;
-#endif
-
-static const char dd_usage[] =
- "dd [if=name] [of=name] [bs=n] [count=n] [skip=n] [seek=n]\n\n"
- "Copy a file, converting and formatting according to options\n\n"
- "\tif=FILE\tread from FILE instead of stdin\n"
- "\tof=FILE\twrite to FILE instead of stdout\n"
- "\tbs=n\tread and write n bytes at a time\n"
- "\tcount=n\tcopy only n input blocks\n"
- "\tskip=n\tskip n input blocks\n"
- "\tseek=n\tskip n output blocks\n"
-
- "\n"
- "Numbers may be suffixed by w (x2), k (x1024), b (x512), or M (x1024^2)\n";
-
-
-extern int dd_main(int argc, char **argv)
+static struct suffix_mult dd_suffixes[] = {
+ { "c", 1 },
+ { "w", 2 },
+ { "b", 512 },
+ { "kD", 1000 },
+ { "k", 1024 },
+ { "MD", 1000000 },
+ { "M", 1048576 },
+ { "GD", 1000000000 },
+ { "G", 1073741824 },
+ { NULL, 0 }
+};
+
+int dd_main(int argc, char **argv)
{
- char *inFile = NULL;
- char *outFile = NULL;
- char *cp;
- int inFd;
- int outFd;
- int inCc = 0;
- int outCc;
- long blockSize = 512;
- uintmax_t skipBlocks = 0;
- uintmax_t seekBlocks = 0;
- uintmax_t count = (uintmax_t) - 1;
- uintmax_t intotal;
- uintmax_t outTotal;
- unsigned char *buf;
-
- argc--;
- argv++;
-
- /* Parse any options */
- while (argc) {
- if (inFile == NULL && (strncmp(*argv, "if", 2) == 0))
- inFile = ((strchr(*argv, '=')) + 1);
- else if (outFile == NULL && (strncmp(*argv, "of", 2) == 0))
- outFile = ((strchr(*argv, '=')) + 1);
- else if (strncmp("count", *argv, 5) == 0) {
- count = getNum((strchr(*argv, '=')) + 1);
- if (count <= 0) {
- fprintf(stderr, "Bad count value %s\n", *argv);
- goto usage;
- }
- } else if (strncmp(*argv, "bs", 2) == 0) {
- blockSize = getNum((strchr(*argv, '=')) + 1);
- if (blockSize <= 0) {
- fprintf(stderr, "Bad block size value %s\n", *argv);
- goto usage;
- }
- } else if (strncmp(*argv, "skip", 4) == 0) {
- skipBlocks = getNum((strchr(*argv, '=')) + 1);
- if (skipBlocks <= 0) {
- fprintf(stderr, "Bad skip value %s\n", *argv);
- goto usage;
+ int i, ifd, ofd, sync = FALSE, trunc = TRUE;
+ size_t in_full = 0, in_part = 0, out_full = 0, out_part = 0;
+ size_t bs = 512, count = -1;
+ ssize_t n;
+ off_t seek = 0, skip = 0;
+ FILE *statusfp;
+ char *infile = NULL, *outfile = NULL, *buf;
+
+ for (i = 1; i < argc; i++) {
+ if (strncmp("bs=", argv[i], 3) == 0)
+ bs = parse_number(argv[i]+3, dd_suffixes);
+ else if (strncmp("count=", argv[i], 6) == 0)
+ count = parse_number(argv[i]+6, dd_suffixes);
+ else if (strncmp("seek=", argv[i], 5) == 0)
+ seek = parse_number(argv[i]+5, dd_suffixes);
+ else if (strncmp("skip=", argv[i], 5) == 0)
+ skip = parse_number(argv[i]+5, dd_suffixes);
+ else if (strncmp("if=", argv[i], 3) == 0)
+ infile = argv[i]+3;
+ else if (strncmp("of=", argv[i], 3) == 0)
+ outfile = argv[i]+3;
+ else if (strncmp("conv=", argv[i], 5) == 0) {
+ buf = argv[i]+5;
+ while (1) {
+ if (strncmp("notrunc", buf, 7) == 0) {
+ trunc = FALSE;
+ buf += 7;
+ } else if (strncmp("sync", buf, 4) == 0) {
+ sync = TRUE;
+ buf += 4;
+ } else {
+ error_msg_and_die("invalid conversion `%s'\n", argv[i]+5);
+ }
+ if (buf[0] == '\0')
+ break;
+ if (buf[0] == ',')
+ buf++;
}
-
- } else if (strncmp(*argv, "seek", 4) == 0) {
- seekBlocks = getNum((strchr(*argv, '=')) + 1);
- if (seekBlocks <= 0) {
- fprintf(stderr, "Bad seek value %s\n", *argv);
- goto usage;
- }
-
- } else {
- goto usage;
- }
- argc--;
- argv++;
+ } else
+ usage(dd_usage);
}
- buf = xmalloc(blockSize);
-
- intotal = 0;
- outTotal = 0;
-
- if (inFile == NULL)
- inFd = fileno(stdin);
- else
- inFd = open(inFile, 0);
+ buf = xmalloc(bs);
- if (inFd < 0) {
- /* Note that we are not freeing buf or closing
- * files here to save a few bytes. This exits
- * here anyways... */
-
- /* free(buf); */
- fatalError( inFile);
+ if (infile != NULL) {
+ if ((ifd = open(infile, O_RDONLY)) < 0)
+ perror_msg_and_die("%s", infile);
+ } else {
+ ifd = STDIN_FILENO;
+ infile = "standard input";
}
- if (outFile == NULL)
- outFd = fileno(stdout);
- else
- outFd = open(outFile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
-
- if (outFd < 0) {
- /* Note that we are not freeing buf or closing
- * files here to save a few bytes. This exits
- * here anyways... */
+ if (outfile != NULL) {
+ if ((ofd = open(outfile, O_WRONLY | O_CREAT, 0666)) < 0)
+ perror_msg_and_die("%s", outfile);
+ statusfp = stdout;
+ } else {
+ ofd = STDOUT_FILENO;
+ outfile = "standard output";
+ statusfp = stderr;
+ }
- /* close(inFd);
- free(buf); */
- fatalError( outFile);
+ if (skip) {
+ if (lseek(ifd, skip * bs, SEEK_CUR) < 0)
+ perror_msg_and_die("%s", infile);
}
- lseek(inFd, skipBlocks * blockSize, SEEK_SET);
- lseek(outFd, seekBlocks * blockSize, SEEK_SET);
- //
- //TODO: Convert to using fullRead & fullWrite
- // from utility.c
- // -Erik
- while (outTotal < count * blockSize) {
- inCc = read(inFd, buf, blockSize);
- if (inCc < 0) {
- perror(inFile);
- goto cleanup;
- } else if (inCc == 0) {
- goto cleanup;
- }
- intotal += inCc;
- cp = buf;
+ if (seek) {
+ if (lseek(ofd, seek * bs, SEEK_CUR) < 0)
+ perror_msg_and_die("%s", outfile);
+ }
- while (intotal > outTotal) {
- if (outTotal + inCc > count * blockSize)
- inCc = count * blockSize - outTotal;
- outCc = write(outFd, cp, inCc);
- if (outCc < 0) {
- perror(outFile);
- goto cleanup;
- } else if (outCc == 0) {
- goto cleanup;
- }
+ if (trunc) {
+ if (ftruncate(ofd, seek * bs) < 0)
+ perror_msg_and_die("%s", outfile);
+ }
- inCc -= outCc;
- cp += outCc;
- outTotal += outCc;
+ while (in_full + in_part != count) {
+ n = safe_read(ifd, buf, bs);
+ if (n < 0)
+ perror_msg_and_die("%s", infile);
+ if (n == 0)
+ break;
+ if (n == bs)
+ in_full++;
+ else
+ in_part++;
+ if (sync) {
+ memset(buf + n, '\0', bs - n);
+ n = bs;
}
+ n = full_write(ofd, buf, n);
+ if (n < 0)
+ perror_msg_and_die("%s", outfile);
+ if (n == bs)
+ out_full++;
+ else
+ out_part++;
}
- if (inCc < 0)
- perror(inFile);
-
- cleanup:
- /* Note that we are not freeing memory or closing
- * files here, to save a few bytes. */
-#if 0
- close(inFd);
- close(outFd);
- free(buf);
-#endif
-
- printf("%ld+%d records in\n", (long) (intotal / blockSize),
- (intotal % blockSize) != 0);
- printf("%ld+%d records out\n", (long) (outTotal / blockSize),
- (outTotal % blockSize) != 0);
- exit(TRUE);
- usage:
+ fprintf(statusfp, "%d+%d records in\n", in_full, in_part);
+ fprintf(statusfp, "%d+%d records out\n", out_full, out_part);
- usage(dd_usage);
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff