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    Contents of /trunk/mkinitrd-magellan/busybox/coreutils/dd.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 5437 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Mini dd implementation for busybox
    4 *
    5 *
    6 * Copyright (C) 2000,2001 Matt Kraai
    7 *
    8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    9 */
    10
    11 #include "busybox.h"
    12 #include <signal.h> /* For FEATURE_DD_SIGNAL_HANDLING */
    13
    14 static const struct suffix_mult dd_suffixes[] = {
    15 { "c", 1 },
    16 { "w", 2 },
    17 { "b", 512 },
    18 { "kD", 1000 },
    19 { "k", 1024 },
    20 { "K", 1024 }, // compat with coreutils dd
    21 { "MD", 1000000 },
    22 { "M", 1048576 },
    23 { "GD", 1000000000 },
    24 { "G", 1073741824 },
    25 { NULL, 0 }
    26 };
    27
    28 static off_t out_full, out_part, in_full, in_part;
    29
    30 static void dd_output_status(int ATTRIBUTE_UNUSED cur_signal)
    31 {
    32 fprintf(stderr, "%"OFF_FMT"d+%"OFF_FMT"d records in\n"
    33 "%"OFF_FMT"d+%"OFF_FMT"d records out\n",
    34 in_full, in_part,
    35 out_full, out_part);
    36 }
    37
    38 static ssize_t full_write_or_warn(int fd, const void *buf, size_t len,
    39 const char* filename)
    40 {
    41 ssize_t n = full_write(fd, buf, len);
    42 if (n < 0)
    43 bb_perror_msg("writing '%s'", filename);
    44 return n;
    45 }
    46
    47 #if ENABLE_LFS
    48 #define XATOU_SFX xatoull_sfx
    49 #else
    50 #define XATOU_SFX xatoul_sfx
    51 #endif
    52
    53 int dd_main(int argc, char **argv)
    54 {
    55 enum {
    56 sync_flag = 1 << 0,
    57 noerror = 1 << 1,
    58 trunc_flag = 1 << 2,
    59 twobufs_flag = 1 << 3,
    60 };
    61 int flags = trunc_flag;
    62 size_t oc = 0, ibs = 512, obs = 512;
    63 ssize_t n, w;
    64 off_t seek = 0, skip = 0, count = OFF_T_MAX;
    65 int oflag, ifd, ofd;
    66 const char *infile = NULL, *outfile = NULL;
    67 char *ibuf, *obuf;
    68
    69 if (ENABLE_FEATURE_DD_SIGNAL_HANDLING) {
    70 struct sigaction sa;
    71
    72 memset(&sa, 0, sizeof(sa));
    73 sa.sa_handler = dd_output_status;
    74 sa.sa_flags = SA_RESTART;
    75 sigemptyset(&sa.sa_mask);
    76 sigaction(SIGUSR1, &sa, 0);
    77 }
    78
    79 for (n = 1; n < argc; n++) {
    80 char *arg = argv[n];
    81 /* Must fit into positive ssize_t */
    82 if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("ibs=", arg, 4))
    83 ibs = xatoul_range_sfx(arg+4, 0, ((size_t)-1L)/2, dd_suffixes);
    84 else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("obs=", arg, 4))
    85 obs = xatoul_range_sfx(arg+4, 0, ((size_t)-1L)/2, dd_suffixes);
    86 else if (!strncmp("bs=", arg, 3))
    87 ibs = obs = xatoul_range_sfx(arg+3, 0, ((size_t)-1L)/2, dd_suffixes);
    88 /* These can be large: */
    89 else if (!strncmp("count=", arg, 6))
    90 count = XATOU_SFX(arg+6, dd_suffixes);
    91 else if (!strncmp("seek=", arg, 5))
    92 seek = XATOU_SFX(arg+5, dd_suffixes);
    93 else if (!strncmp("skip=", arg, 5))
    94 skip = XATOU_SFX(arg+5, dd_suffixes);
    95
    96 else if (!strncmp("if=", arg, 3))
    97 infile = arg+3;
    98 else if (!strncmp("of=", arg, 3))
    99 outfile = arg+3;
    100 else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("conv=", arg, 5)) {
    101 arg += 5;
    102 while (1) {
    103 if (!strncmp("notrunc", arg, 7)) {
    104 flags &= ~trunc_flag;
    105 arg += 7;
    106 } else if (!strncmp("sync", arg, 4)) {
    107 flags |= sync_flag;
    108 arg += 4;
    109 } else if (!strncmp("noerror", arg, 7)) {
    110 flags |= noerror;
    111 arg += 7;
    112 } else {
    113 bb_error_msg_and_die(bb_msg_invalid_arg, arg, "conv");
    114 }
    115 if (arg[0] == '\0') break;
    116 if (*arg++ != ',') bb_show_usage();
    117 }
    118 } else
    119 bb_show_usage();
    120 }
    121
    122 ibuf = obuf = xmalloc(ibs);
    123 if (ibs != obs) {
    124 flags |= twobufs_flag;
    125 obuf = xmalloc(obs);
    126 }
    127
    128 if (infile != NULL)
    129 ifd = xopen(infile, O_RDONLY);
    130 else {
    131 ifd = STDIN_FILENO;
    132 infile = bb_msg_standard_input;
    133 }
    134
    135 if (outfile != NULL) {
    136 oflag = O_WRONLY | O_CREAT;
    137
    138 if (!seek && (flags & trunc_flag))
    139 oflag |= O_TRUNC;
    140
    141 ofd = xopen(outfile, oflag);
    142
    143 if (seek && (flags & trunc_flag)) {
    144 if (ftruncate(ofd, seek * obs) < 0) {
    145 struct stat st;
    146
    147 if (fstat(ofd, &st) < 0 || S_ISREG(st.st_mode) ||
    148 S_ISDIR(st.st_mode))
    149 goto die_outfile;
    150 }
    151 }
    152 } else {
    153 ofd = STDOUT_FILENO;
    154 outfile = bb_msg_standard_output;
    155 }
    156
    157 if (skip) {
    158 if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) {
    159 while (skip-- > 0) {
    160 n = safe_read(ifd, ibuf, ibs);
    161 if (n < 0)
    162 bb_perror_msg_and_die("%s", infile);
    163 if (n == 0)
    164 break;
    165 }
    166 }
    167 }
    168
    169 if (seek) {
    170 if (lseek(ofd, seek * obs, SEEK_CUR) < 0)
    171 goto die_outfile;
    172 }
    173
    174 while (in_full + in_part != count) {
    175 if (flags & noerror) {
    176 /* Pre-zero the buffer when doing the noerror thing */
    177 memset(ibuf, '\0', ibs);
    178 }
    179
    180 n = safe_read(ifd, ibuf, ibs);
    181 if (n == 0)
    182 break;
    183 if (n < 0) {
    184 if (flags & noerror) {
    185 n = ibs;
    186 bb_perror_msg("%s", infile);
    187 } else
    188 bb_perror_msg_and_die("%s", infile);
    189 }
    190 if ((size_t)n == ibs)
    191 in_full++;
    192 else {
    193 in_part++;
    194 if (flags & sync_flag) {
    195 memset(ibuf + n, '\0', ibs - n);
    196 n = ibs;
    197 }
    198 }
    199 if (flags & twobufs_flag) {
    200 char *tmp = ibuf;
    201 while (n) {
    202 size_t d = obs - oc;
    203
    204 if (d > n)
    205 d = n;
    206 memcpy(obuf + oc, tmp, d);
    207 n -= d;
    208 tmp += d;
    209 oc += d;
    210 if (oc == obs) {
    211 w = full_write_or_warn(ofd, obuf, obs, outfile);
    212 if (w < 0) goto out_status;
    213 if (w == obs)
    214 out_full++;
    215 else if (w > 0)
    216 out_part++;
    217 oc = 0;
    218 }
    219 }
    220 } else {
    221 w = full_write_or_warn(ofd, ibuf, n, outfile);
    222 if (w < 0) goto out_status;
    223 if (w == obs)
    224 out_full++;
    225 else if (w > 0)
    226 out_part++;
    227 }
    228 }
    229
    230 if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
    231 w = full_write_or_warn(ofd, obuf, oc, outfile);
    232 if (w < 0) goto out_status;
    233 if (w > 0)
    234 out_part++;
    235 }
    236 if (close(ifd) < 0) {
    237 bb_perror_msg_and_die("%s", infile);
    238 }
    239
    240 if (close(ofd) < 0) {
    241 die_outfile:
    242 bb_perror_msg_and_die("%s", outfile);
    243 }
    244 out_status:
    245 dd_output_status(0);
    246
    247 return EXIT_SUCCESS;
    248 }