X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=dd.c;h=32eeb661cf3aaef32a9f4c961e589d6c0d4b3739;hb=39b727f498aad830780169228995e6e8f34953de;hp=01441c3144e3fdfd2c0884e6a973d8dc2abc03f3;hpb=3570a34de46b1f7dedd16999bb1687e2d6b55d40;p=oweals%2Fbusybox.git diff --git a/dd.c b/dd.c index 01441c314..32eeb661c 100644 --- a/dd.c +++ b/dd.c @@ -2,15 +2,8 @@ /* * Mini dd implementation for busybox * - * Copyright (C) 1999, 2000 by Lineo, inc. - * Written by Erik Andersen , * - * 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 * * 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 @@ -28,140 +21,134 @@ * */ - #include "busybox.h" -#include -#include + +#include #include -#include -#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1) -#include -#else -typedef unsigned long long int uintmax_t; -#endif - -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; - int inFd; - int outFd; - int inCc = 0; - int outCc; - int trunc=TRUE; - long blockSize = 512; - 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; - uintmax_t readSize; - 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 = getNum((strchr(*argv, '=')) + 1); - if (count < 0) { - errorMsg("Bad count value %s\n", *argv); - goto usage; - } - } else if (strncmp(*argv, "bs", 2) == 0) { - blockSize = getNum((strchr(*argv, '=')) + 1); - if (blockSize <= 0) { - errorMsg("Bad block size value %s\n", *argv); - goto usage; - } - } else if (strncmp(*argv, "skip", 4) == 0) { - skipBlocks = getNum((strchr(*argv, '=')) + 1); - if (skipBlocks <= 0) { - errorMsg("Bad skip value %s\n", *argv); - goto usage; - } + int i, ifd, ofd, oflag, 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; - } else if (strncmp(*argv, "seek", 4) == 0) { - seekBlocks = getNum((strchr(*argv, '=')) + 1); - if (seekBlocks <= 0) { - errorMsg("Bad seek value %s\n", *argv); - goto usage; + 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, "conv", 4) == 0) { - keyword = (strchr(*argv, '=') + 1); - if (strcmp(keyword, "notrunc") == 0) - trunc=FALSE; - } else { - goto usage; - } - argc--; - argv++; + } else + usage(dd_usage); } - if (inFile == NULL) - inFd = fileno(stdin); - else - inFd = open(inFile, 0); - - if (inFd < 0) { - /* Note that we are not freeing buf or closing - * files here to save a few bytes. This exits - * here anyways... */ + buf = xmalloc(bs); - /* 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, 0666); + if (outfile != NULL) { + oflag = O_WRONLY | O_CREAT; - if (outFd < 0) { - /* Note that we are not freeing buf or closing - * files here to save a few bytes. This exits - * here anyways... */ + if (!seek && trunc) + oflag |= O_TRUNC; - /* close(inFd); - free(buf); */ - fatalError( outFile); + if ((ofd = open(outfile, oflag, 0666)) < 0) + perror_msg_and_die("%s", outfile); + + if (seek && trunc) { + if (ftruncate(ofd, seek * bs) < 0) + perror_msg_and_die("%s", outfile); + } + + statusfp = stdout; + } else { + ofd = STDOUT_FILENO; + outfile = "standard output"; + statusfp = stderr; + } + + if (skip) { + if (lseek(ifd, skip * bs, SEEK_CUR) < 0) + perror_msg_and_die("%s", infile); } - lseek(inFd, (off_t) (skipBlocks * blockSize), SEEK_SET); - lseek(outFd, (off_t) (seekBlocks * blockSize), SEEK_SET); - totalSize=count*blockSize; - while ((readSize = totalSize - inTotal) > 0) { - if (readSize > BUFSIZ) - readSize=BUFSIZ; - inCc = fullRead(inFd, buf, readSize); - inTotal += inCc; - if ((outCc = fullWrite(outFd, buf, inCc)) < 1) + if (seek) { + if (lseek(ofd, seek * bs, SEEK_CUR) < 0) + perror_msg_and_die("%s", outfile); + } + + 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; - outTotal += outCc; - } - if (trunc == TRUE) { - ftruncate(outFd, lseek(outFd, 0, SEEK_CUR)); + 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++; } - /* 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 - - 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: - - usage(dd_usage); + + fprintf(statusfp, "%d+%d records in\n", in_full, in_part); + fprintf(statusfp, "%d+%d records out\n", out_full, out_part); + + return EXIT_SUCCESS; }