1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini dd implementation for busybox
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4 | *
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5 | *
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6 | * Copyright (C) 2000,2001 Matt Kraai
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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9 | */
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10 |
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11 | #include <sys/types.h>
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12 | #include <sys/stat.h>
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13 | #include <stdlib.h>
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14 | #include <stdio.h>
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15 | #include <unistd.h>
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16 | #include <string.h>
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17 | #include <fcntl.h>
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18 | #include <signal.h> // For FEATURE_DD_SIGNAL_HANDLING
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19 | #include "busybox.h"
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20 |
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21 | static const struct suffix_mult dd_suffixes[] = {
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22 | { "c", 1 },
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23 | { "w", 2 },
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24 | { "b", 512 },
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25 | { "kD", 1000 },
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26 | { "k", 1024 },
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27 | { "MD", 1000000 },
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28 | { "M", 1048576 },
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29 | { "GD", 1000000000 },
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30 | { "G", 1073741824 },
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31 | { NULL, 0 }
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32 | };
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33 |
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34 | static size_t out_full;
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35 | static size_t out_part;
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36 | static size_t in_full;
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37 | static size_t in_part;
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38 |
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39 | static void dd_output_status(int cur_signal)
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40 | {
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41 | fprintf(stderr, "%ld+%ld records in\n%ld+%ld records out\n",
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42 | (long)in_full, (long)in_part,
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43 | (long)out_full, (long)out_part);
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44 | }
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45 |
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46 | int dd_main(int argc, char **argv)
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47 | {
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48 | size_t count = -1, oc = 0, ibs = 512, obs = 512;
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49 | ssize_t n;
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50 | off_t seek = 0, skip = 0;
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51 | int sync_flag = FALSE, noerror = FALSE, trunc_flag = TRUE, twobufs_flag = 0,
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52 | oflag, ifd, ofd, i;
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53 | const char *infile = NULL, *outfile = NULL;
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54 | char *ibuf, *obuf;
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55 |
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56 | if (ENABLE_FEATURE_DD_SIGNAL_HANDLING)
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57 | {
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58 | struct sigaction sa;
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59 |
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60 | memset(&sa, 0, sizeof(sa));
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61 | sa.sa_handler = dd_output_status;
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62 | sa.sa_flags = SA_RESTART;
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63 | sigemptyset(&sa.sa_mask);
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64 | sigaction(SIGUSR1, &sa, 0);
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65 | }
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66 |
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67 | for (i = 1; i < argc; i++) {
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68 | if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("ibs=", argv[i], 4)) {
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69 | ibs = bb_xparse_number(argv[i]+4, dd_suffixes);
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70 | twobufs_flag++;
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71 | } else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("obs=", argv[i], 4)) {
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72 | obs = bb_xparse_number(argv[i]+4, dd_suffixes);
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73 | twobufs_flag++;
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74 | } else if (!strncmp("bs=", argv[i], 3)) {
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75 | ibs = obs = bb_xparse_number(argv[i]+3, dd_suffixes);
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76 | } else if (!strncmp("count=", argv[i], 6))
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77 | count = bb_xparse_number(argv[i]+6, dd_suffixes);
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78 | else if (!strncmp("seek=", argv[i], 5))
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79 | seek = bb_xparse_number(argv[i]+5, dd_suffixes);
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80 | else if (!strncmp("skip=", argv[i], 5))
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81 | skip = bb_xparse_number(argv[i]+5, dd_suffixes);
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82 | else if (!strncmp("if=", argv[i], 3))
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83 | infile = argv[i]+3;
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84 | else if (!strncmp("of=", argv[i], 3))
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85 | outfile = argv[i]+3;
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86 | else if (ENABLE_FEATURE_DD_IBS_OBS && !strncmp("conv=", argv[i], 5)) {
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87 | ibuf = argv[i]+5;
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88 | while (1) {
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89 | if (!strncmp("notrunc", ibuf, 7)) {
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90 | trunc_flag = FALSE;
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91 | ibuf += 7;
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92 | } else if (!strncmp("sync", ibuf, 4)) {
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93 | sync_flag = TRUE;
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94 | ibuf += 4;
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95 | } else if (!strncmp("noerror", ibuf, 7)) {
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96 | noerror = TRUE;
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97 | ibuf += 7;
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98 | } else {
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99 | bb_error_msg_and_die(bb_msg_invalid_arg, argv[i]+5, "conv");
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100 | }
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101 | if (ibuf[0] == '\0') break;
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102 | if (ibuf[0] == ',') ibuf++;
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103 | }
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104 | } else
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105 | bb_show_usage();
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106 | }
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107 | ibuf = xmalloc(ibs);
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108 |
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109 | if (twobufs_flag) obuf = xmalloc(obs);
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110 | else obuf = ibuf;
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111 |
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112 | if (infile != NULL) {
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113 | ifd = bb_xopen(infile, O_RDONLY);
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114 | } else {
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115 | ifd = STDIN_FILENO;
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116 | infile = bb_msg_standard_input;
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117 | }
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118 |
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119 | if (outfile != NULL) {
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120 | oflag = O_WRONLY | O_CREAT;
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121 |
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122 | if (!seek && trunc_flag) {
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123 | oflag |= O_TRUNC;
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124 | }
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125 |
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126 | ofd = bb_xopen3(outfile, oflag, 0666);
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127 |
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128 | if (seek && trunc_flag) {
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129 | if (ftruncate(ofd, seek * obs) < 0) {
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130 | struct stat st;
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131 |
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132 | if (fstat (ofd, &st) < 0 || S_ISREG (st.st_mode) ||
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133 | S_ISDIR (st.st_mode)) {
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134 | bb_perror_msg_and_die("%s", outfile);
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135 | }
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136 | }
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137 | }
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138 | } else {
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139 | ofd = STDOUT_FILENO;
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140 | outfile = bb_msg_standard_output;
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141 | }
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142 |
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143 | if (skip) {
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144 | if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) {
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145 | while (skip-- > 0) {
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146 | n = safe_read(ifd, ibuf, ibs);
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147 | if (n < 0)
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148 | bb_perror_msg_and_die("%s", infile);
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149 | if (n == 0)
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150 | break;
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151 | }
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152 | }
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153 | }
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154 |
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155 | if (seek) {
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156 | if (lseek(ofd, seek * obs, SEEK_CUR) < 0) {
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157 | bb_perror_msg_and_die("%s", outfile);
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158 | }
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159 | }
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160 |
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161 | while (in_full + in_part != count) {
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162 | if (noerror) {
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163 | /* Pre-zero the buffer when doing the noerror thing */
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164 | memset(ibuf, '\0', ibs);
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165 | }
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166 |
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167 | n = safe_read(ifd, ibuf, ibs);
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168 | if (n == 0) {
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169 | break;
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170 | }
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171 | if (n < 0) {
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172 | if (noerror) {
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173 | n = ibs;
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174 | bb_perror_msg("%s", infile);
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175 | } else {
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176 | bb_perror_msg_and_die("%s", infile);
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177 | }
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178 | }
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179 | if ((size_t)n == ibs) {
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180 | in_full++;
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181 | } else {
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182 | in_part++;
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183 | if (sync_flag) {
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184 | memset(ibuf + n, '\0', ibs - n);
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185 | n = ibs;
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186 | }
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187 | }
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188 | if (twobufs_flag) {
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189 | char *tmp = ibuf;
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190 | while (n) {
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191 | size_t d = obs - oc;
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192 |
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193 | if (d > n) d = n;
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194 | memcpy(obuf + oc, tmp, d);
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195 | n -= d;
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196 | tmp += d;
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197 | oc += d;
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198 | if (oc == obs) {
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199 | if (bb_full_write(ofd, obuf, obs) < 0) {
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200 | bb_perror_msg_and_die("%s", outfile);
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201 | }
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202 | out_full++;
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203 | oc = 0;
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204 | }
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205 | }
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206 | } else {
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207 | if ((n = bb_full_write(ofd, ibuf, n)) < 0) {
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208 | bb_perror_msg_and_die("%s", outfile);
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209 | }
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210 | if (n == ibs) out_full++;
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211 | else out_part++;
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212 | }
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213 | }
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214 |
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215 | if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
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216 | if (bb_full_write(ofd, obuf, oc) < 0) {
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217 | bb_perror_msg_and_die("%s", outfile);
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218 | }
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219 | out_part++;
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220 | }
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221 | if (close (ifd) < 0) {
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222 | bb_perror_msg_and_die("%s", infile);
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223 | }
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224 |
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225 | if (close (ofd) < 0) {
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226 | bb_perror_msg_and_die("%s", outfile);
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227 | }
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228 |
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229 | dd_output_status(0);
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230 |
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231 | return EXIT_SUCCESS;
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232 | }
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