Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * busybox patch applet to handle the unified diff format. |
Denis Vlasenko | 0beaff8 | 2007-09-21 13:16:32 +0000 | [diff] [blame] | 4 | * Copyright (C) 2003 Glenn McGrath |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 5 | * |
Bernhard Reutner-Fischer | ee9cf48 | 2005-10-27 06:59:05 +0000 | [diff] [blame] | 6 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 7 | * |
| 8 | * This applet is written to work with patches generated by GNU diff, |
| 9 | * where there is equivalent functionality busybox patch shall behave |
| 10 | * as per GNU patch. |
| 11 | * |
| 12 | * There is a SUSv3 specification for patch, however it looks to be |
| 13 | * incomplete, it doesnt even mention unified diff format. |
| 14 | * http://www.opengroup.org/onlinepubs/007904975/utilities/patch.html |
| 15 | * |
| 16 | * Issues |
| 17 | * - Non-interactive |
Denis Vlasenko | 0a10da2 | 2006-12-17 00:49:56 +0000 | [diff] [blame] | 18 | * - Patches must apply cleanly or patch (not just one hunk) will fail. |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 19 | * - Reject file isnt saved |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 20 | */ |
| 21 | |
| 22 | #include <getopt.h> |
Denis Vlasenko | b6adbf1 | 2007-05-26 19:00:18 +0000 | [diff] [blame] | 23 | |
| 24 | #include "libbb.h" |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 25 | |
"Vladimir N. Oleynik" | dfe6e74 | 2006-01-31 09:44:04 +0000 | [diff] [blame] | 26 | static unsigned int copy_lines(FILE *src_stream, FILE *dest_stream, const unsigned int lines_count) |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 27 | { |
"Vladimir N. Oleynik" | dfe6e74 | 2006-01-31 09:44:04 +0000 | [diff] [blame] | 28 | unsigned int i = 0; |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 29 | |
| 30 | while (src_stream && (i < lines_count)) { |
| 31 | char *line; |
Denis Vlasenko | 2d5ca60 | 2006-10-12 22:43:20 +0000 | [diff] [blame] | 32 | line = xmalloc_fgets(src_stream); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 33 | if (line == NULL) { |
| 34 | break; |
| 35 | } |
| 36 | if (fputs(line, dest_stream) == EOF) { |
Denis Vlasenko | e1a0d48 | 2006-10-20 13:28:22 +0000 | [diff] [blame] | 37 | bb_perror_msg_and_die("error writing to new file"); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 38 | } |
| 39 | free(line); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 40 | |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 41 | i++; |
| 42 | } |
Denis Vlasenko | 079f8af | 2006-11-27 16:49:31 +0000 | [diff] [blame] | 43 | return i; |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | /* If patch_level is -1 it will remove all directory names |
| 47 | * char *line must be greater than 4 chars |
| 48 | * returns NULL if the file doesnt exist or error |
| 49 | * returns malloc'ed filename |
| 50 | */ |
| 51 | |
"Vladimir N. Oleynik" | dfe6e74 | 2006-01-31 09:44:04 +0000 | [diff] [blame] | 52 | static char *extract_filename(char *line, int patch_level) |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 53 | { |
Rob Landley | baa89b3 | 2006-05-07 21:10:06 +0000 | [diff] [blame] | 54 | char *temp, *filename_start_ptr = line + 4; |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 55 | int i; |
| 56 | |
| 57 | /* Terminate string at end of source filename */ |
Denis Vlasenko | eea7212 | 2007-08-06 13:34:10 +0000 | [diff] [blame] | 58 | temp = strchrnul(filename_start_ptr, '\t'); |
| 59 | *temp = '\0'; |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 60 | |
Denis Vlasenko | eea7212 | 2007-08-06 13:34:10 +0000 | [diff] [blame] | 61 | /* Skip over (patch_level) number of leading directories */ |
| 62 | if (patch_level == -1) |
| 63 | patch_level = INT_MAX; |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 64 | for (i = 0; i < patch_level; i++) { |
Denis Vlasenko | 51742f4 | 2007-04-12 00:32:05 +0000 | [diff] [blame] | 65 | temp = strchr(filename_start_ptr, '/'); |
| 66 | if (!temp) |
| 67 | break; |
Rob Landley | baa89b3 | 2006-05-07 21:10:06 +0000 | [diff] [blame] | 68 | filename_start_ptr = temp + 1; |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 69 | } |
| 70 | |
Denis Vlasenko | 079f8af | 2006-11-27 16:49:31 +0000 | [diff] [blame] | 71 | return xstrdup(filename_start_ptr); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | static int file_doesnt_exist(const char *filename) |
| 75 | { |
| 76 | struct stat statbuf; |
Denis Vlasenko | 079f8af | 2006-11-27 16:49:31 +0000 | [diff] [blame] | 77 | return stat(filename, &statbuf); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 78 | } |
| 79 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame^] | 80 | int patch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Rob Landley | dfba741 | 2006-03-06 20:47:33 +0000 | [diff] [blame] | 81 | int patch_main(int argc, char **argv) |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 82 | { |
"Vladimir N. Oleynik" | dfe6e74 | 2006-01-31 09:44:04 +0000 | [diff] [blame] | 83 | int patch_level = -1; |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 84 | char *patch_line; |
Rob Landley | 078bacf | 2005-09-01 03:02:23 +0000 | [diff] [blame] | 85 | int ret; |
| 86 | FILE *patch_file = NULL; |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 87 | |
Rob Landley | 078bacf | 2005-09-01 03:02:23 +0000 | [diff] [blame] | 88 | { |
| 89 | char *p, *i; |
Denis Vlasenko | fe7cd64 | 2007-08-18 15:32:12 +0000 | [diff] [blame] | 90 | ret = getopt32(argv, "p:i:", &p, &i); |
Rob Landley | 078bacf | 2005-09-01 03:02:23 +0000 | [diff] [blame] | 91 | if (ret & 1) |
Denis Vlasenko | 1385899 | 2006-10-08 12:49:22 +0000 | [diff] [blame] | 92 | patch_level = xatol_range(p, -1, USHRT_MAX); |
Rob Landley | 078bacf | 2005-09-01 03:02:23 +0000 | [diff] [blame] | 93 | if (ret & 2) { |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 94 | patch_file = xfopen(i, "r"); |
Bernhard Reutner-Fischer | 554a9ff | 2005-10-10 13:34:19 +0000 | [diff] [blame] | 95 | } else { |
| 96 | patch_file = stdin; |
Rob Landley | 078bacf | 2005-09-01 03:02:23 +0000 | [diff] [blame] | 97 | } |
| 98 | ret = 0; |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 99 | } |
| 100 | |
Denis Vlasenko | fc77eb5 | 2007-08-01 23:30:54 +0000 | [diff] [blame] | 101 | patch_line = xmalloc_getline(patch_file); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 102 | while (patch_line) { |
| 103 | FILE *src_stream; |
| 104 | FILE *dst_stream; |
| 105 | char *original_filename; |
| 106 | char *new_filename; |
| 107 | char *backup_filename; |
| 108 | unsigned int src_cur_line = 1; |
| 109 | unsigned int dest_cur_line = 0; |
| 110 | unsigned int dest_beg_line; |
| 111 | unsigned int bad_hunk_count = 0; |
| 112 | unsigned int hunk_count = 0; |
| 113 | char copy_trailing_lines_flag = 0; |
| 114 | |
| 115 | /* Skip everything upto the "---" marker |
| 116 | * No need to parse the lines "Only in <dir>", and "diff <args>" |
| 117 | */ |
| 118 | while (patch_line && strncmp(patch_line, "--- ", 4) != 0) { |
| 119 | free(patch_line); |
Denis Vlasenko | fc77eb5 | 2007-08-01 23:30:54 +0000 | [diff] [blame] | 120 | patch_line = xmalloc_getline(patch_file); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 121 | } |
Denis Vlasenko | ab24e18 | 2006-11-30 16:41:15 +0000 | [diff] [blame] | 122 | /* FIXME: patch_line NULL check?? */ |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 123 | |
| 124 | /* Extract the filename used before the patch was generated */ |
| 125 | original_filename = extract_filename(patch_line, patch_level); |
| 126 | free(patch_line); |
| 127 | |
Denis Vlasenko | fc77eb5 | 2007-08-01 23:30:54 +0000 | [diff] [blame] | 128 | patch_line = xmalloc_getline(patch_file); |
Denis Vlasenko | ab24e18 | 2006-11-30 16:41:15 +0000 | [diff] [blame] | 129 | /* FIXME: NULL check?? */ |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 130 | if (strncmp(patch_line, "+++ ", 4) != 0) { |
| 131 | ret = 2; |
Denis Vlasenko | e1a0d48 | 2006-10-20 13:28:22 +0000 | [diff] [blame] | 132 | bb_error_msg("invalid patch"); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 133 | continue; |
| 134 | } |
| 135 | new_filename = extract_filename(patch_line, patch_level); |
| 136 | free(patch_line); |
| 137 | |
| 138 | if (file_doesnt_exist(new_filename)) { |
| 139 | char *line_ptr; |
| 140 | /* Create leading directories */ |
| 141 | line_ptr = strrchr(new_filename, '/'); |
| 142 | if (line_ptr) { |
| 143 | *line_ptr = '\0'; |
| 144 | bb_make_directory(new_filename, -1, FILEUTILS_RECUR); |
| 145 | *line_ptr = '/'; |
| 146 | } |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 147 | dst_stream = xfopen(new_filename, "w+"); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 148 | backup_filename = NULL; |
| 149 | } else { |
| 150 | backup_filename = xmalloc(strlen(new_filename) + 6); |
| 151 | strcpy(backup_filename, new_filename); |
| 152 | strcat(backup_filename, ".orig"); |
| 153 | if (rename(new_filename, backup_filename) == -1) { |
Denis Vlasenko | a6dbb08 | 2006-10-12 19:29:44 +0000 | [diff] [blame] | 154 | bb_perror_msg_and_die("cannot create file %s", |
Bernhard Reutner-Fischer | 554a9ff | 2005-10-10 13:34:19 +0000 | [diff] [blame] | 155 | backup_filename); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 156 | } |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 157 | dst_stream = xfopen(new_filename, "w"); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | if ((backup_filename == NULL) || file_doesnt_exist(original_filename)) { |
| 161 | src_stream = NULL; |
| 162 | } else { |
| 163 | if (strcmp(original_filename, new_filename) == 0) { |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 164 | src_stream = xfopen(backup_filename, "r"); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 165 | } else { |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 166 | src_stream = xfopen(original_filename, "r"); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 167 | } |
| 168 | } |
| 169 | |
| 170 | printf("patching file %s\n", new_filename); |
| 171 | |
| 172 | /* Handle each hunk */ |
Denis Vlasenko | 2d5ca60 | 2006-10-12 22:43:20 +0000 | [diff] [blame] | 173 | patch_line = xmalloc_fgets(patch_file); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 174 | while (patch_line) { |
| 175 | unsigned int count; |
| 176 | unsigned int src_beg_line; |
| 177 | unsigned int unused; |
| 178 | unsigned int hunk_offset_start = 0; |
| 179 | int hunk_error = 0; |
| 180 | |
| 181 | /* This bit should be improved */ |
| 182 | if ((sscanf(patch_line, "@@ -%d,%d +%d,%d @@", &src_beg_line, &unused, &dest_beg_line, &unused) != 4) && |
| 183 | (sscanf(patch_line, "@@ -%d,%d +%d @@", &src_beg_line, &unused, &dest_beg_line) != 3) && |
| 184 | (sscanf(patch_line, "@@ -%d +%d,%d @@", &src_beg_line, &dest_beg_line, &unused) != 3)) { |
| 185 | /* No more hunks for this file */ |
| 186 | break; |
| 187 | } |
| 188 | free(patch_line); |
| 189 | hunk_count++; |
| 190 | |
| 191 | if (src_beg_line && dest_beg_line) { |
| 192 | /* Copy unmodified lines upto start of hunk */ |
| 193 | /* src_beg_line will be 0 if its a new file */ |
| 194 | count = src_beg_line - src_cur_line; |
| 195 | if (copy_lines(src_stream, dst_stream, count) != count) { |
Denis Vlasenko | e1a0d48 | 2006-10-20 13:28:22 +0000 | [diff] [blame] | 196 | bb_error_msg_and_die("bad src file"); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 197 | } |
| 198 | src_cur_line += count; |
| 199 | dest_cur_line += count; |
| 200 | copy_trailing_lines_flag = 1; |
| 201 | } |
| 202 | hunk_offset_start = src_cur_line; |
| 203 | |
Denis Vlasenko | 2d5ca60 | 2006-10-12 22:43:20 +0000 | [diff] [blame] | 204 | while ((patch_line = xmalloc_fgets(patch_file)) != NULL) { |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 205 | if ((*patch_line == '-') || (*patch_line == ' ')) { |
| 206 | char *src_line = NULL; |
| 207 | if (src_stream) { |
Denis Vlasenko | 2d5ca60 | 2006-10-12 22:43:20 +0000 | [diff] [blame] | 208 | src_line = xmalloc_fgets(src_stream); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 209 | if (!src_line) { |
| 210 | hunk_error++; |
| 211 | break; |
| 212 | } else { |
| 213 | src_cur_line++; |
| 214 | } |
| 215 | if (strcmp(src_line, patch_line + 1) != 0) { |
Denis Vlasenko | e1a0d48 | 2006-10-20 13:28:22 +0000 | [diff] [blame] | 216 | bb_error_msg("hunk #%d FAILED at %d", hunk_count, hunk_offset_start); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 217 | hunk_error++; |
| 218 | free(patch_line); |
Denis Vlasenko | 0a10da2 | 2006-12-17 00:49:56 +0000 | [diff] [blame] | 219 | /* Probably need to find next hunk, etc... */ |
| 220 | /* but for now we just bail out */ |
Denis Vlasenko | f7583d8 | 2006-12-17 00:33:29 +0000 | [diff] [blame] | 221 | patch_line = NULL; |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 222 | break; |
| 223 | } |
| 224 | free(src_line); |
| 225 | } |
| 226 | if (*patch_line == ' ') { |
| 227 | fputs(patch_line + 1, dst_stream); |
| 228 | dest_cur_line++; |
| 229 | } |
| 230 | } else if (*patch_line == '+') { |
| 231 | fputs(patch_line + 1, dst_stream); |
| 232 | dest_cur_line++; |
| 233 | } else { |
| 234 | break; |
| 235 | } |
| 236 | free(patch_line); |
| 237 | } |
| 238 | if (hunk_error) { |
| 239 | bad_hunk_count++; |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | /* Cleanup last patched file */ |
| 244 | if (copy_trailing_lines_flag) { |
| 245 | copy_lines(src_stream, dst_stream, -1); |
| 246 | } |
| 247 | if (src_stream) { |
| 248 | fclose(src_stream); |
| 249 | } |
| 250 | if (dst_stream) { |
| 251 | fclose(dst_stream); |
| 252 | } |
| 253 | if (bad_hunk_count) { |
| 254 | if (!ret) { |
| 255 | ret = 1; |
| 256 | } |
| 257 | bb_error_msg("%d out of %d hunk FAILED", bad_hunk_count, hunk_count); |
| 258 | } else { |
| 259 | /* It worked, we can remove the backup */ |
| 260 | if (backup_filename) { |
| 261 | unlink(backup_filename); |
| 262 | } |
| 263 | if ((dest_cur_line == 0) || (dest_beg_line == 0)) { |
| 264 | /* The new patched file is empty, remove it */ |
Denis Vlasenko | 1bb552b | 2007-04-05 21:25:15 +0000 | [diff] [blame] | 265 | xunlink(new_filename); |
| 266 | if (strcmp(new_filename, original_filename) != 0) |
| 267 | xunlink(original_filename); |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 268 | } |
| 269 | } |
| 270 | } |
| 271 | |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 272 | /* 0 = SUCCESS |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 273 | * 1 = Some hunks failed |
| 274 | * 2 = More serious problems |
| 275 | */ |
Denis Vlasenko | 079f8af | 2006-11-27 16:49:31 +0000 | [diff] [blame] | 276 | return ret; |
Glenn L McGrath | 655d814 | 2003-06-22 15:32:41 +0000 | [diff] [blame] | 277 | } |