+/* vi: set sw=4 ts=4: */
/*
- * Copyright (c) 1999 by David I. Bell
- * Permission is granted to use, distribute, or modify this source,
- * provided that this copyright notice remains intact.
+ * Mini dd implementation for busybox
*
- * The "dd" command, originally taken from sash.
+ * 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.
- * Majorly modified, and bugs fixed for busybox by Erik Andersen <andersee@debian.org> <andersen@lineo.com>
+ *
+ * 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
*/
-#include "internal.h"
-#ifdef BB_DD
-
-const char dd_usage[] =
-"Copy a file, converting and formatting according to options\n\
-\n\
-usage: [if=name] [of=name] [bs=n] [count=n]\n\
-\tif=FILE\tread from FILE instead of stdin\n\
-\tof=FILE\twrite to FILE instead of stout\n\
-\tbs=n\tread and write N bytes at a time\n\
-\tcount=n\tcopy only n input blocks\n\
-\n\
-BYTES may be suffixed: by k for x1024, b for x512, and w for x2.\n";
-
+#include "busybox.h"
+#include <features.h>
#include <stdio.h>
-#include <dirent.h>
-#include <errno.h>
#include <fcntl.h>
-#include <signal.h>
-#include <time.h>
-
-
-#define PAR_NONE 0
-#define PAR_IF 1
-#define PAR_OF 2
-#define PAR_BS 3
-#define PAR_COUNT 4
-
-
-typedef struct
-{
- const char * name;
- int value;
-} PARAM;
-
-
-static const PARAM params[] =
-{
- {"if", PAR_IF},
- {"of", PAR_OF},
- {"bs", PAR_BS},
- {"count", PAR_COUNT},
- {NULL, PAR_NONE}
-};
-
-
-static long getNum(const char * cp);
+#include <errno.h>
+#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
+#include <inttypes.h>
+#else
+typedef unsigned long long int uintmax_t;
+#endif
-extern int
-dd_main (int argc, char **argv)
+extern int dd_main(int argc, char **argv)
{
- const char * str;
- const PARAM * par;
- const char * inFile;
- const char * outFile;
- char * cp;
- int inFd;
- int outFd;
- int inCc=0;
- int outCc;
- int blockSize;
- long count;
- long intotal;
- long outTotal;
- unsigned char* buf;
- unsigned char localBuf[BUF_SIZE];
-
- inFile = NULL;
- outFile = NULL;
- blockSize = 512;
- count = 1;
-
-
- while (--argc > 0)
- {
- str = *++argv;
- cp = strchr(str, '=');
-
- if (cp == NULL)
- {
- fprintf(stderr, "Bad dd argument\n");
- goto usage;
- }
-
- *cp++ = '\0';
-
- for (par = params; par->name; par++)
- {
- if (strcmp(str, par->name) == 0)
- break;
- }
-
- switch (par->value)
- {
- case PAR_IF:
- if (inFile)
- {
- fprintf(stderr, "Multiple input files illegal\n");
- goto usage;
- }
-
- //fprintf(stderr, "if=%s\n", cp);
- inFile = cp;
- break;
-
- case PAR_OF:
- if (outFile)
- {
- fprintf(stderr, "Multiple output files illegal\n");
- goto usage;
- }
-
- //fprintf(stderr, "of=%s\n", cp);
- outFile = cp;
- break;
-
- case PAR_BS:
- blockSize = getNum(cp);
- //fprintf(stderr, "bs=%d\n", blockSize);
-
- if (blockSize <= 0)
- {
- fprintf(stderr, "Bad block size value\n");
- goto usage;
- }
-
- break;
-
- case PAR_COUNT:
- count = getNum(cp);
- //fprintf(stderr, "count=%ld\n", count);
-
- if (count < 0)
- {
- fprintf(stderr, "Bad count value\n");
- goto usage;
- }
-
- break;
-
- default:
+ char *inFile = NULL;
+ char *outFile = NULL;
+ int inFd;
+ int outFd;
+ int inCc = 0;
+ int outCc;
+ int trunc=TRUE;
+ int sync=FALSE;
+ long blockSize = 512,ibs;
+ uintmax_t skipBlocks = 0;
+ uintmax_t seekBlocks = 0;
+ uintmax_t count = (uintmax_t) - 1;
+ uintmax_t inTotal = 0;
+ uintmax_t outTotal = 0;
+ uintmax_t totalSize;
+
+ unsigned char buf[BUFSIZ];
+ char *keyword = NULL;
+
+ 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 = atoi_w_units((strchr(*argv, '=')) + 1);
+ if (count < 0) {
+ error_msg("Bad count value %s\n", *argv);
goto usage;
- }
- }
-
- buf = localBuf;
-
- if (blockSize > sizeof(localBuf))
- {
- buf = malloc(blockSize);
+ }
+ } else if (strncmp(*argv, "bs", 2) == 0) {
+ blockSize = atoi_w_units((strchr(*argv, '=')) + 1);
+ if (blockSize <= 0) {
+ error_msg("Bad block size value %s\n", *argv);
+ goto usage;
+ }
+ } else if (strncmp(*argv, "skip", 4) == 0) {
+ skipBlocks = atoi_w_units((strchr(*argv, '=')) + 1);
+ if (skipBlocks <= 0) {
+ error_msg("Bad skip value %s\n", *argv);
+ goto usage;
+ }
- if (buf == NULL)
- {
- fprintf(stderr, "Cannot allocate buffer\n");
- return 1;
+ } else if (strncmp(*argv, "seek", 4) == 0) {
+ seekBlocks = atoi_w_units((strchr(*argv, '=')) + 1);
+ if (seekBlocks <= 0) {
+ error_msg("Bad seek value %s\n", *argv);
+ goto usage;
+ }
+ } else if (strncmp(*argv, "conv", 4) == 0) {
+ keyword = (strchr(*argv, '=') + 1);
+ if (strcmp(keyword, "notrunc") == 0)
+ trunc=FALSE;
+ if (strcmp(keyword, "sync") == 0)
+ sync=TRUE;
+ } else {
+ goto usage;
}
+ argc--;
+ argv++;
}
- intotal = 0;
- outTotal = 0;
-
if (inFile == NULL)
- inFd = STDIN;
+ inFd = fileno(stdin);
else
- inFd = open(inFile, 0);
-
- if (inFd < 0)
- {
- perror(inFile);
+ inFd = open(inFile, 0);
- if (buf != localBuf)
- free(buf);
+ if (inFd < 0) {
+ /* Note that we are not freeing buf or closing
+ * files here to save a few bytes. This exits
+ * here anyways... */
- return 1;
+ /* free(buf); */
+ perror_msg_and_die("%s", inFile);
}
if (outFile == NULL)
- outFd = STDOUT;
+ outFd = fileno(stdout);
else
- outFd = creat(outFile, 0666);
+ outFd = open(outFile, O_WRONLY | O_CREAT, 0666);
- if (outFd < 0)
- {
- perror(outFile);
- close(inFd);
+ if (outFd < 0) {
+ /* Note that we are not freeing buf or closing
+ * files here to save a few bytes. This exits
+ * here anyways... */
- if (buf != localBuf)
- free(buf);
-
- return 1;
+ /* close(inFd);
+ free(buf); */
+ perror_msg_and_die("%s", outFile);
}
- while ( outTotal < count*blockSize )
- {
- inCc = read(inFd, buf, blockSize);
- if (inCc < 0) {
- perror(inFile);
- goto cleanup;
- }
- //fprintf(stderr, "read in =%d\n", inCc);
- intotal += inCc;
- cp = buf;
-
-
- while ( intotal > outTotal )
- {
- if (outTotal+inCc > count*blockSize)
- inCc=count*blockSize-outTotal;
- outCc = write(outFd, cp, inCc);
- if (outCc < 0)
- {
- perror(outFile);
- goto cleanup;
+ lseek(inFd, (off_t) (skipBlocks * blockSize), SEEK_SET);
+ lseek(outFd, (off_t) (seekBlocks * blockSize), SEEK_SET);
+ totalSize=count*blockSize;
+
+ ibs=blockSize;
+ if (ibs > BUFSIZ)
+ ibs=BUFSIZ;
+
+ while (totalSize > outTotal) {
+ inCc = full_read(inFd, buf, ibs);
+ inTotal += inCc;
+ if ( (sync==TRUE) && (inCc>0) )
+ while (inCc<ibs)
+ buf[inCc++]='\0';
+
+ if ((outCc = full_write(outFd, buf, inCc)) < 1){
+ if (outCc < 0 ){
+ perror("Error during write");
}
- //fprintf(stderr, "wrote out =%d\n", outCc);
-
- inCc -= outCc;
- cp += outCc;
- outTotal += outCc;
- //fprintf(stderr, "outTotal=%ld\n", outTotal);
+ break;
}
+ outTotal += outCc;
+ }
+ if (trunc == TRUE) {
+ ftruncate(outFd, lseek(outFd, 0, SEEK_CUR));
}
-
- if (inCc < 0)
- perror(inFile);
-
-cleanup:
+ /* Note that we are not freeing memory or closing
+ * files here, to save a few bytes. */
+#ifdef BB_FEATURE_CLEAN_UP
close(inFd);
+ close(outFd);
+#endif
- if (close(outFd) < 0)
- perror(outFile);
-
- if (buf != localBuf)
- free(buf);
-
- printf("%ld+%d records in\n", intotal / blockSize,
- (intotal % blockSize) != 0);
-
- printf("%ld+%d records out\n", outTotal / blockSize,
- (outTotal % blockSize) != 0);
- return 0;
-usage:
-
- fprintf(stderr, "%s", dd_usage);
- return 1;
-}
-
-
-/*
- * Read a number with a possible multiplier.
- * Returns -1 if the number format is illegal.
- */
-static long
-getNum(const char * cp)
-{
- long value;
-
- if (!isDecimal(*cp))
- return -1;
-
- value = 0;
-
- while (isDecimal(*cp))
- value = value * 10 + *cp++ - '0';
-
- switch (*cp++)
- {
- case 'k':
- value *= 1024;
- break;
-
- case 'b':
- value *= 512;
- break;
-
- case 'w':
- value *= 2;
- break;
-
- case '\0':
- return value;
-
- default:
- return -1;
- }
-
- if (*cp)
- return -1;
+ printf("%ld+%d records in\n", (long) (inTotal / blockSize),
+ (inTotal % blockSize) != 0);
+ printf("%ld+%d records out\n", (long) (outTotal / blockSize),
+ (outTotal % blockSize) != 0);
+ return EXIT_SUCCESS;
+ usage:
- return value;
+ usage(dd_usage);
}
-
-#endif
-/* END CODE */
-
projects / oweals / busybox.git / blobdiff