X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=dd.c;h=3f58929ba44f15382a232250158d0e115a8245a1;hb=3a6da8c183142a2681a2382b63e970f457cf807b;hp=07f092cc23c8d1e91053fefc5ba8bfc91352faee;hpb=9d3aba7b37b275350a9fe0887871da9ba73dcbd7;p=oweals%2Fbusybox.git diff --git a/dd.c b/dd.c index 07f092cc2..3f58929ba 100644 --- a/dd.c +++ b/dd.c @@ -1,307 +1,158 @@ +/* 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 + * Copyright (C) 2000 by Matt Kraai + * + * 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 +#include #include -#include -#include +#include +#include #include -#include -#include - - -#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} +#include "busybox.h" + + +static const 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 } }; - -static long getNum(const char * cp); - -extern int -dd_main (int argc, char **argv) +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; + int i, ifd, ofd, oflag, sync_flag = 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_flag = TRUE; + buf += 4; + } else { + error_msg_and_die("invalid conversion `%s'", argv[i]+5); } - - //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; - } + if (buf[0] == '\0') + break; + if (buf[0] == ',') + buf++; + } + } else + show_usage(); } - buf = localBuf; - - if (blockSize > sizeof(localBuf)) - { - buf = malloc(blockSize); + buf = xmalloc(bs); - if (buf == NULL) - { - fprintf(stderr, "Cannot allocate buffer\n"); - return 1; - } + if (infile != NULL) { + if ((ifd = open(infile, O_RDONLY)) < 0) + perror_msg_and_die("%s", infile); + } else { + ifd = STDIN_FILENO; + infile = "standard input"; } - intotal = 0; - outTotal = 0; + if (outfile != NULL) { + oflag = O_WRONLY | O_CREAT; - if (inFile == NULL) - inFd = STDIN; - else - inFd = open(inFile, 0); + if (!seek && trunc) + oflag |= O_TRUNC; - if (inFd < 0) - { - perror(inFile); + if ((ofd = open(outfile, oflag, 0666)) < 0) + perror_msg_and_die("%s", outfile); - if (buf != localBuf) - free(buf); + if (seek && trunc) { + if (ftruncate(ofd, seek * bs) < 0) + perror_msg_and_die("%s", outfile); + } - return 1; + statusfp = stdout; + } else { + ofd = STDOUT_FILENO; + outfile = "standard output"; + statusfp = stderr; } - if (outFile == NULL) - outFd = STDOUT; - else - outFd = creat(outFile, 0666); - - if (outFd < 0) - { - perror(outFile); - close(inFd); - - if (buf != localBuf) - free(buf); - - return 1; + if (skip) { + if (lseek(ifd, skip * bs, SEEK_CUR) < 0) + perror_msg_and_die("%s", infile); } - 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; - } - //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 * bs, SEEK_CUR) < 0) + perror_msg_and_die("%s", 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; + 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; - - case 'b': - value *= 512; - break; - - case 'w': - value *= 2; - break; - - case '\0': - return value; - - default: - return -1; + if (n == bs) + in_full++; + else + in_part++; + if (sync_flag) { + 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 (*cp) - return -1; + fprintf(statusfp, "%d+%d records in\n", in_full, in_part); + fprintf(statusfp, "%d+%d records out\n", out_full, out_part); - return value; + return EXIT_SUCCESS; } - -#endif -/* END CODE */ -