1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * busybox patch applet to handle the unified diff format.
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4 | * Copyright (C) 2003 Glenn McGrath <bug1@iinet.net.au>
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5 | *
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6 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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7 | *
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8 | * This applet is written to work with patches generated by GNU diff,
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9 | * where there is equivalent functionality busybox patch shall behave
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10 | * as per GNU patch.
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11 | *
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12 | * There is a SUSv3 specification for patch, however it looks to be
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13 | * incomplete, it doesnt even mention unified diff format.
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14 | * http://www.opengroup.org/onlinepubs/007904975/utilities/patch.html
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15 | *
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16 | * Issues
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17 | * - Non-interactive
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18 | * - Patches must apply cleanly or the hunk will fail.
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19 | * - Reject file isnt saved
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20 | * -
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21 | */
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22 |
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23 | #include <getopt.h>
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24 | #include <string.h>
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25 | #include <stdlib.h>
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26 | #include <unistd.h>
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27 | #include "busybox.h"
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28 |
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29 | static unsigned int copy_lines(FILE *src_stream, FILE *dest_stream, const unsigned int lines_count)
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30 | {
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31 | unsigned int i = 0;
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32 |
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33 | while (src_stream && (i < lines_count)) {
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34 | char *line;
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35 | line = bb_get_line_from_file(src_stream);
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36 | if (line == NULL) {
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37 | break;
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38 | }
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39 | if (fputs(line, dest_stream) == EOF) {
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40 | bb_perror_msg_and_die("Error writing to new file");
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41 | }
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42 | free(line);
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43 |
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44 | i++;
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45 | }
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46 | return(i);
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47 | }
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48 |
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49 | /* If patch_level is -1 it will remove all directory names
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50 | * char *line must be greater than 4 chars
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51 | * returns NULL if the file doesnt exist or error
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52 | * returns malloc'ed filename
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53 | */
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54 |
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55 | static char *extract_filename(char *line, int patch_level)
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56 | {
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57 | char *temp, *filename_start_ptr = line + 4;
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58 | int i;
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59 |
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60 | /* Terminate string at end of source filename */
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61 | temp = strchr(filename_start_ptr, '\t');
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62 | if (temp) *temp = 0;
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63 |
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64 | /* skip over (patch_level) number of leading directories */
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65 | for (i = 0; i < patch_level; i++) {
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66 | if(!(temp = strchr(filename_start_ptr, '/'))) break;
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67 | filename_start_ptr = temp + 1;
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68 | }
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69 |
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70 | return(bb_xstrdup(filename_start_ptr));
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71 | }
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72 |
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73 | static int file_doesnt_exist(const char *filename)
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74 | {
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75 | struct stat statbuf;
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76 | return(stat(filename, &statbuf));
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77 | }
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78 |
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79 | int patch_main(int argc, char **argv)
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80 | {
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81 | int patch_level = -1;
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82 | char *patch_line;
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83 | int ret;
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84 | FILE *patch_file = NULL;
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85 |
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86 | {
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87 | char *p, *i;
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88 | ret = bb_getopt_ulflags(argc, argv, "p:i:", &p, &i);
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89 | if (ret & 1)
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90 | patch_level = bb_xgetlarg(p, 10, -1, USHRT_MAX);
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91 | if (ret & 2) {
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92 | patch_file = bb_xfopen(i, "r");
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93 | } else {
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94 | patch_file = stdin;
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95 | }
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96 | ret = 0;
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97 | }
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98 |
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99 | patch_line = bb_get_line_from_file(patch_file);
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100 | while (patch_line) {
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101 | FILE *src_stream;
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102 | FILE *dst_stream;
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103 | char *original_filename;
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104 | char *new_filename;
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105 | char *backup_filename;
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106 | unsigned int src_cur_line = 1;
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107 | unsigned int dest_cur_line = 0;
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108 | unsigned int dest_beg_line;
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109 | unsigned int bad_hunk_count = 0;
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110 | unsigned int hunk_count = 0;
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111 | char copy_trailing_lines_flag = 0;
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112 |
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113 | /* Skip everything upto the "---" marker
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114 | * No need to parse the lines "Only in <dir>", and "diff <args>"
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115 | */
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116 | while (patch_line && strncmp(patch_line, "--- ", 4) != 0) {
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117 | free(patch_line);
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118 | patch_line = bb_get_line_from_file(patch_file);
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119 | }
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120 |
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121 | /* Extract the filename used before the patch was generated */
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122 | original_filename = extract_filename(patch_line, patch_level);
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123 | free(patch_line);
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124 |
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125 | patch_line = bb_get_line_from_file(patch_file);
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126 | if (strncmp(patch_line, "+++ ", 4) != 0) {
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127 | ret = 2;
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128 | bb_error_msg("Invalid patch");
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129 | continue;
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130 | }
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131 | new_filename = extract_filename(patch_line, patch_level);
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132 | free(patch_line);
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133 |
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134 | if (file_doesnt_exist(new_filename)) {
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135 | char *line_ptr;
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136 | /* Create leading directories */
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137 | line_ptr = strrchr(new_filename, '/');
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138 | if (line_ptr) {
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139 | *line_ptr = '\0';
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140 | bb_make_directory(new_filename, -1, FILEUTILS_RECUR);
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141 | *line_ptr = '/';
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142 | }
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143 | dst_stream = bb_xfopen(new_filename, "w+");
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144 | backup_filename = NULL;
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145 | } else {
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146 | backup_filename = xmalloc(strlen(new_filename) + 6);
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147 | strcpy(backup_filename, new_filename);
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148 | strcat(backup_filename, ".orig");
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149 | if (rename(new_filename, backup_filename) == -1) {
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150 | bb_perror_msg_and_die("Couldnt create file %s",
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151 | backup_filename);
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152 | }
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153 | dst_stream = bb_xfopen(new_filename, "w");
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154 | }
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155 |
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156 | if ((backup_filename == NULL) || file_doesnt_exist(original_filename)) {
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157 | src_stream = NULL;
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158 | } else {
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159 | if (strcmp(original_filename, new_filename) == 0) {
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160 | src_stream = bb_xfopen(backup_filename, "r");
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161 | } else {
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162 | src_stream = bb_xfopen(original_filename, "r");
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163 | }
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164 | }
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165 |
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166 | printf("patching file %s\n", new_filename);
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167 |
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168 | /* Handle each hunk */
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169 | patch_line = bb_get_line_from_file(patch_file);
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170 | while (patch_line) {
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171 | unsigned int count;
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172 | unsigned int src_beg_line;
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173 | unsigned int unused;
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174 | unsigned int hunk_offset_start = 0;
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175 | int hunk_error = 0;
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176 |
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177 | /* This bit should be improved */
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178 | if ((sscanf(patch_line, "@@ -%d,%d +%d,%d @@", &src_beg_line, &unused, &dest_beg_line, &unused) != 4) &&
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179 | (sscanf(patch_line, "@@ -%d,%d +%d @@", &src_beg_line, &unused, &dest_beg_line) != 3) &&
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180 | (sscanf(patch_line, "@@ -%d +%d,%d @@", &src_beg_line, &dest_beg_line, &unused) != 3)) {
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181 | /* No more hunks for this file */
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182 | break;
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183 | }
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184 | free(patch_line);
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185 | hunk_count++;
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186 |
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187 | if (src_beg_line && dest_beg_line) {
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188 | /* Copy unmodified lines upto start of hunk */
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189 | /* src_beg_line will be 0 if its a new file */
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190 | count = src_beg_line - src_cur_line;
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191 | if (copy_lines(src_stream, dst_stream, count) != count) {
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192 | bb_error_msg_and_die("Bad src file");
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193 | }
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194 | src_cur_line += count;
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195 | dest_cur_line += count;
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196 | copy_trailing_lines_flag = 1;
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197 | }
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198 | hunk_offset_start = src_cur_line;
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199 |
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200 | while ((patch_line = bb_get_line_from_file(patch_file)) != NULL) {
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201 | if ((*patch_line == '-') || (*patch_line == ' ')) {
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202 | char *src_line = NULL;
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203 | if (src_stream) {
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204 | src_line = bb_get_line_from_file(src_stream);
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205 | if (!src_line) {
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206 | hunk_error++;
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207 | break;
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208 | } else {
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209 | src_cur_line++;
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210 | }
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211 | if (strcmp(src_line, patch_line + 1) != 0) {
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212 | bb_error_msg("Hunk #%d FAILED at %d.", hunk_count, hunk_offset_start);
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213 | hunk_error++;
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214 | free(patch_line);
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215 | break;
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216 | }
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217 | free(src_line);
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218 | }
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219 | if (*patch_line == ' ') {
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220 | fputs(patch_line + 1, dst_stream);
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221 | dest_cur_line++;
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222 | }
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223 | } else if (*patch_line == '+') {
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224 | fputs(patch_line + 1, dst_stream);
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225 | dest_cur_line++;
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226 | } else {
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227 | break;
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228 | }
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229 | free(patch_line);
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230 | }
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231 | if (hunk_error) {
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232 | bad_hunk_count++;
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233 | }
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234 | }
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235 |
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236 | /* Cleanup last patched file */
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237 | if (copy_trailing_lines_flag) {
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238 | copy_lines(src_stream, dst_stream, -1);
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239 | }
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240 | if (src_stream) {
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241 | fclose(src_stream);
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242 | }
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243 | if (dst_stream) {
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244 | fclose(dst_stream);
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245 | }
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246 | if (bad_hunk_count) {
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247 | if (!ret) {
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248 | ret = 1;
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249 | }
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250 | bb_error_msg("%d out of %d hunk FAILED", bad_hunk_count, hunk_count);
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251 | } else {
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252 | /* It worked, we can remove the backup */
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253 | if (backup_filename) {
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254 | unlink(backup_filename);
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255 | }
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256 | if ((dest_cur_line == 0) || (dest_beg_line == 0)) {
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257 | /* The new patched file is empty, remove it */
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258 | if (unlink(new_filename) == -1) {
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259 | bb_perror_msg_and_die("Couldnt remove file %s", new_filename);
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260 | }
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261 | if (unlink(original_filename) == -1) {
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262 | bb_perror_msg_and_die("Couldnt remove original file %s", new_filename);
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263 | }
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264 | }
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265 | }
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266 | }
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267 |
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268 | /* 0 = SUCCESS
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269 | * 1 = Some hunks failed
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270 | * 2 = More serious problems
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271 | */
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272 | return(ret);
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273 | }
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