+/* 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.
*
- * 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>
+ * Copyright (C) 2000,2001 Matt Kraai
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#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 <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
+#include "busybox.h"
+#include <signal.h> /* For FEATURE_DD_SIGNAL_HANDLING */
+
+static const struct suffix_mult dd_suffixes[] = {
+ { "c", 1 },
+ { "w", 2 },
+ { "b", 512 },
+ { "kD", 1000 },
+ { "k", 1024 },
+ { "K", 1024 }, /* compat with coreutils dd */
+ { "MD", 1000000 },
+ { "M", 1048576 },
+ { "GD", 1000000000 },
+ { "G", 1073741824 },
+ { NULL, 0 }
+};
+struct globals {
+ off_t out_full, out_part, in_full, in_part;
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
-typedef struct
+static void dd_output_status(int ATTRIBUTE_UNUSED cur_signal)
{
- const char * name;
- int value;
-} PARAM;
-
+ fprintf(stderr, "%"OFF_FMT"d+%"OFF_FMT"d records in\n"
+ "%"OFF_FMT"d+%"OFF_FMT"d records out\n",
+ G.in_full, G.in_part,
+ G.out_full, G.out_part);
+}
-static const PARAM params[] =
+static ssize_t full_write_or_warn(int fd, const void *buf, size_t len,
+ const char * const filename)
{
- {"if", PAR_IF},
- {"of", PAR_OF},
- {"bs", PAR_BS},
- {"count", PAR_COUNT},
- {NULL, PAR_NONE}
-};
-
-
-static long getNum(const char * cp);
+ ssize_t n = full_write(fd, buf, len);
+ if (n < 0)
+ bb_perror_msg("writing '%s'", filename);
+ return n;
+}
-extern int
-dd_main (struct FileInfo *unused, int argc, char **argv)
+static bool write_and_stats(int fd, const void *buf, size_t len, size_t obs,
+ const char * const filename)
{
- 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;
+ ssize_t n = full_write_or_warn(fd, buf, len, filename);
+ if (n < 0)
+ return 1;
+ if (n == obs)
+ G.out_full++;
+ else if (n > 0)
+ G.out_part++;
+ return 0;
+}
+#if ENABLE_LFS
+#define XATOU_SFX xatoull_sfx
+#else
+#define XATOU_SFX xatoul_sfx
+#endif
- while (--argc > 0)
- {
- str = *++argv;
- cp = strchr(str, '=');
+int dd_main(int argc, char **argv);
+int dd_main(int argc, char **argv)
+{
+ enum {
+ sync_flag = 1 << 0,
+ noerror = 1 << 1,
+ trunc_flag = 1 << 2,
+ twobufs_flag = 1 << 3,
+ };
+ const char * const keywords[] = {
+ "bs=", "count=", "seek=", "skip=", "if=", "of=",
+#if ENABLE_FEATURE_DD_IBS_OBS
+ "ibs=", "obs=", "conv=", "notrunc", "sync", "noerror",
+#endif
+ NULL
+ };
+#define OP_bs 0 + 1
+#define OP_count OP_bs + 1
+#define OP_seek OP_count + 1
+#define OP_skip OP_seek + 1
+#define OP_if OP_skip + 1
+#define OP_of OP_if + 1
+#define OP_ibs OP_of + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_obs OP_ibs + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv OP_obs + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv_notrunc OP_conv + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv_sync OP_conv_notrunc + ENABLE_FEATURE_DD_IBS_OBS
+#define OP_conv_noerror OP_conv_sync + ENABLE_FEATURE_DD_IBS_OBS
+
+ int flags = trunc_flag;
+ size_t oc = 0, ibs = 512, obs = 512;
+ ssize_t n, w;
+ off_t seek = 0, skip = 0, count = OFF_T_MAX;
+ int ifd, ofd;
+ const char *infile = NULL, *outfile = NULL;
+ char *ibuf, *obuf;
+
+ if (ENABLE_FEATURE_DD_SIGNAL_HANDLING) {
+ struct sigaction sa;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = dd_output_status;
+ sa.sa_flags = SA_RESTART;
+ sigemptyset(&sa.sa_mask);
+ sigaction(SIGUSR1, &sa, 0);
+ }
- if (cp == NULL)
- {
- fprintf(stderr, "Bad dd argument\n");
- goto usage;
+ for (n = 1; n < argc; n++) {
+ smalluint key_len, what;
+ char *key;
+ char *arg = argv[n];
+
+//XXX:FIXME: we reject plain "dd --" This would cost ~20 bytes, so..
+//if (*arg == '-' && *++arg == '-' && !*++arg) continue;
+ key = strstr(arg, "=");
+ if (key == NULL)
+ bb_show_usage();
+ key_len = key - arg + 1;
+ key = xstrndup(arg, key_len);
+ what = index_in_str_array(keywords, key) + 1;
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(key);
+ if (what == 0)
+ bb_show_usage();
+ arg += key_len;
+ /* Must fit into positive ssize_t */
+ if (ENABLE_FEATURE_DD_IBS_OBS) {
+ if (what == OP_ibs) {
+ ibs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes);
+ continue;
+ }
+ if (what == OP_obs) {
+ obs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes);
+ continue;
+ }
+ if (what == OP_conv) {
+ while (1) {
+ /* find ',', replace them with nil so we can use arg for
+ * index_in_str_array without copying.
+ * We rely on arg being non-null, else strstr would fault.
+ */
+ key = strstr(arg, ",");
+ if (key)
+ *key = '\0';
+ what = index_in_str_array(keywords, arg) + 1;
+ if (what < OP_conv_notrunc)
+ bb_error_msg_and_die(bb_msg_invalid_arg, arg, "conv");
+ if (what == OP_conv_notrunc)
+ flags &= ~trunc_flag;
+ if (what == OP_conv_sync)
+ flags |= sync_flag;
+ if (what == OP_conv_noerror)
+ flags |= noerror;
+ if (!key) /* no ',' left, so this was the last specifier */
+ break;
+ arg += key - arg + 1; /* skip this keyword plus ',' */
+ }
+ continue;
+ }
}
-
- *cp++ = '\0';
-
- for (par = params; par->name; par++)
- {
- if (strcmp(str, par->name) == 0)
- break;
+ if (what == OP_bs) {
+ ibs = obs = xatoul_range_sfx(arg, 1, ((size_t)-1L)/2, dd_suffixes);
+ continue;
}
-
- 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:
- goto usage;
+ /* These can be large: */
+ if (what == OP_count) {
+ count = XATOU_SFX(arg, dd_suffixes);
+ continue;
}
- }
-
- buf = localBuf;
-
- if (blockSize > sizeof(localBuf))
- {
- buf = malloc(blockSize);
-
- if (buf == NULL)
- {
- fprintf(stderr, "Cannot allocate buffer\n");
- return 1;
+ if (what == OP_seek) {
+ seek = XATOU_SFX(arg, dd_suffixes);
+ continue;
+ }
+ if (what == skip) {
+ skip = XATOU_SFX(arg, dd_suffixes);
+ continue;
+ }
+ if (what == OP_if) {
+ infile = arg;
+ continue;
}
+ if (what == OP_of)
+ outfile = arg;
}
-
- intotal = 0;
- outTotal = 0;
-
- if (inFile == NULL)
- inFd = STDIN;
- else
- inFd = open(inFile, 0);
-
- if (inFd < 0)
- {
- perror(inFile);
-
- if (buf != localBuf)
- free(buf);
-
- return 1;
+//XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever
+ ibuf = obuf = xmalloc(ibs);
+ if (ibs != obs) {
+ flags |= twobufs_flag;
+ obuf = xmalloc(obs);
}
+ if (infile != NULL)
+ ifd = xopen(infile, O_RDONLY);
+ else {
+ ifd = STDIN_FILENO;
+ infile = bb_msg_standard_input;
+ }
+ if (outfile != NULL) {
+ int oflag = O_WRONLY | O_CREAT;
- if (outFile == NULL)
- outFd = STDOUT;
- else
- outFd = creat(outFile, 0666);
-
- if (outFd < 0)
- {
- perror(outFile);
- close(inFd);
+ if (!seek && (flags & trunc_flag))
+ oflag |= O_TRUNC;
- if (buf != localBuf)
- free(buf);
+ ofd = xopen(outfile, oflag);
- return 1;
- }
+ if (seek && (flags & trunc_flag)) {
+ if (ftruncate(ofd, seek * obs) < 0) {
+ struct stat st;
- while ( outTotal < count*blockSize )
- {
- inCc = read(inFd, buf, blockSize);
- if (inCc < 0) {
- perror(inFile);
- goto cleanup;
+ if (fstat(ofd, &st) < 0 || S_ISREG(st.st_mode) ||
+ S_ISDIR(st.st_mode))
+ goto die_outfile;
+ }
}
- //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;
+ } else {
+ ofd = STDOUT_FILENO;
+ outfile = bb_msg_standard_output;
+ }
+ if (skip) {
+ if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) {
+ while (skip-- > 0) {
+ n = safe_read(ifd, ibuf, ibs);
+ if (n < 0)
+ goto die_infile;
+ if (n == 0)
+ break;
}
- //fprintf(stderr, "wrote out =%d\n", outCc);
-
- inCc -= outCc;
- cp += outCc;
- outTotal += outCc;
- //fprintf(stderr, "outTotal=%ld\n", outTotal);
}
}
+ if (seek) {
+ if (lseek(ofd, seek * obs, SEEK_CUR) < 0)
+ goto die_outfile;
+ }
- if (inCc < 0)
- perror(inFile);
-
-cleanup:
- close(inFd);
-
- 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;
+ while (G.in_full + G.in_part != count) {
+ if (flags & noerror) /* Pre-zero the buffer when for noerror */
+ memset(ibuf, '\0', ibs);
+ n = safe_read(ifd, ibuf, ibs);
+ if (n == 0)
break;
+ if (n < 0) {
+ if (flags & noerror) {
+ n = ibs;
+ bb_perror_msg("%s", infile);
+ } else
+ goto die_infile;
+ }
+ if ((size_t)n == ibs)
+ G.in_full++;
+ else {
+ G.in_part++;
+ if (flags & sync_flag) {
+ memset(ibuf + n, '\0', ibs - n);
+ n = ibs;
+ }
+ }
+ if (flags & twobufs_flag) {
+ char *tmp = ibuf;
+ while (n) {
+ size_t d = obs - oc;
+
+ if (d > n)
+ d = n;
+ memcpy(obuf + oc, tmp, d);
+ n -= d;
+ tmp += d;
+ oc += d;
+ if (oc == obs) {
+ if (write_and_stats(ofd, obuf, obs, obs, outfile))
+ goto out_status;
+ oc = 0;
+ }
+ }
+ } else
+ if (write_and_stats(ofd, ibuf, n, obs, outfile))
+ goto out_status;
+ }
- case '\0':
- return value;
-
- default:
- return -1;
+ if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
+ w = full_write_or_warn(ofd, obuf, oc, outfile);
+ if (w < 0) goto out_status;
+ if (w > 0)
+ G.out_part++;
+ }
+ if (close(ifd) < 0) {
+die_infile:
+ bb_perror_msg_and_die("%s", infile);
}
- if (*cp)
- return -1;
+ if (close(ofd) < 0) {
+die_outfile:
+ bb_perror_msg_and_die("%s", outfile);
+ }
+out_status:
+ dd_output_status(0);
- return value;
+ return EXIT_SUCCESS;
}
-
-#endif
-/* END CODE */
-
projects / oweals / busybox.git / blobdiff