| 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
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| 5 | *
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| 6 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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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 patch (not just one 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 | #include "libbb.h"
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| 23 |
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| 24 | static unsigned copy_lines(FILE *src_stream, FILE *dst_stream, unsigned lines_count)
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| 25 | {
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| 26 | while (src_stream && lines_count) {
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| 27 | char *line;
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| 28 | line = xmalloc_fgets(src_stream);
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| 29 | if (line == NULL) {
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| 30 | break;
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| 31 | }
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| 32 | if (fputs(line, dst_stream) == EOF) {
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| 33 | bb_perror_msg_and_die("error writing to new file");
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| 34 | }
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| 35 | free(line);
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| 36 | lines_count--;
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| 37 | }
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| 38 | return lines_count;
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| 39 | }
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| 40 |
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| 41 | /* If patch_level is -1 it will remove all directory names
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| 42 | * char *line must be greater than 4 chars
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| 43 | * returns NULL if the file doesnt exist or error
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| 44 | * returns malloc'ed filename
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| 45 | * NB: frees 1st argument!
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| 46 | */
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| 47 | static char *extract_filename(char *line, int patch_level, const char *pat)
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| 48 | {
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| 49 | char *temp = NULL, *filename_start_ptr = line + 4;
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| 50 |
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| 51 | if (strncmp(line, pat, 4) == 0) {
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| 52 | /* Terminate string at end of source filename */
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| 53 | line[strcspn(line, "\t\n\r")] = '\0';
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| 54 |
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| 55 | /* Skip over (patch_level) number of leading directories */
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| 56 | while (patch_level--) {
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| 57 | temp = strchr(filename_start_ptr, '/');
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| 58 | if (!temp)
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| 59 | break;
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| 60 | filename_start_ptr = temp + 1;
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| 61 | }
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| 62 | temp = xstrdup(filename_start_ptr);
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| 63 | }
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| 64 | free(line);
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| 65 | return temp;
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| 66 | }
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| 67 |
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| 68 | int patch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 69 | int patch_main(int argc UNUSED_PARAM, char **argv)
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| 70 | {
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| 71 | struct stat saved_stat;
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| 72 | char *patch_line;
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| 73 | FILE *patch_file;
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| 74 | int patch_level;
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| 75 | int ret = 0;
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| 76 | char plus = '+';
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| 77 | unsigned opt;
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| 78 | enum {
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| 79 | OPT_R = (1 << 2),
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| 80 | OPT_N = (1 << 3),
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| 81 | /*OPT_f = (1 << 4), ignored */
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| 82 | /*OPT_E = (1 << 5), ignored, this is the default */
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| 83 | /*OPT_g = (1 << 6), ignored */
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| 84 | OPT_dry_run = (1 << 7) * ENABLE_LONG_OPTS,
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| 85 | };
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| 86 |
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| 87 | xfunc_error_retval = 2;
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| 88 | {
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| 89 | const char *p = "-1";
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| 90 | const char *i = "-"; /* compat */
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| 91 | #if ENABLE_LONG_OPTS
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| 92 | static const char patch_longopts[] ALIGN1 =
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| 93 | "strip\0" Required_argument "p"
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| 94 | "input\0" Required_argument "i"
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| 95 | "reverse\0" No_argument "R"
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| 96 | "forward\0" No_argument "N"
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| 97 | /* "Assume user knows what [s]he is doing, do not ask any questions": */
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| 98 | "force\0" No_argument "f" /*ignored*/
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| 99 | # if ENABLE_DESKTOP
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| 100 | "remove-empty-files\0" No_argument "E" /*ignored*/
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| 101 | /* "Controls actions when a file is under RCS or SCCS control,
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| 102 | * and does not exist or is read-only and matches the default version,
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| 103 | * or when a file is under ClearCase control and does not exist..."
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| 104 | * IOW: rather obscure option.
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| 105 | * But Gentoo's portage does use -g0 */
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| 106 | "get\0" Required_argument "g" /*ignored*/
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| 107 | # endif
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| 108 | "dry-run\0" No_argument "\xfd"
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| 109 | # if ENABLE_DESKTOP
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| 110 | "backup-if-mismatch\0" No_argument "\xfe" /*ignored*/
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| 111 | "no-backup-if-mismatch\0" No_argument "\xff" /*ignored*/
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| 112 | # endif
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| 113 | ;
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| 114 | applet_long_options = patch_longopts;
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| 115 | #endif
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| 116 | /* -f,-E,-g are ignored */
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| 117 | opt = getopt32(argv, "p:i:RN""fEg:", &p, &i, NULL);
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| 118 | if (opt & OPT_R)
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| 119 | plus = '-';
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| 120 | patch_level = xatoi(p); /* can be negative! */
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| 121 | patch_file = xfopen_stdin(i);
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| 122 | }
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| 123 |
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| 124 | patch_line = xmalloc_fgetline(patch_file);
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| 125 | while (patch_line) {
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| 126 | FILE *src_stream;
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| 127 | FILE *dst_stream;
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| 128 | //char *old_filename;
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| 129 | char *new_filename;
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| 130 | char *backup_filename = NULL;
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| 131 | unsigned src_cur_line = 1;
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| 132 | unsigned dst_cur_line = 0;
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| 133 | unsigned dst_beg_line;
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| 134 | unsigned bad_hunk_count = 0;
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| 135 | unsigned hunk_count = 0;
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| 136 | smallint copy_trailing_lines_flag = 0;
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| 137 |
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| 138 | /* Skip everything upto the "---" marker
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| 139 | * No need to parse the lines "Only in <dir>", and "diff <args>"
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| 140 | */
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| 141 | do {
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| 142 | /* Extract the filename used before the patch was generated */
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| 143 | new_filename = extract_filename(patch_line, patch_level, "--- ");
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| 144 | // was old_filename above
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| 145 | patch_line = xmalloc_fgetline(patch_file);
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| 146 | if (!patch_line) goto quit;
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| 147 | } while (!new_filename);
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| 148 | free(new_filename); // "source" filename is irrelevant
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| 149 |
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| 150 | new_filename = extract_filename(patch_line, patch_level, "+++ ");
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| 151 | if (!new_filename) {
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| 152 | bb_error_msg_and_die("invalid patch");
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| 153 | }
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| 154 |
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| 155 | /* Get access rights from the file to be patched */
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| 156 | if (stat(new_filename, &saved_stat) != 0) {
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| 157 | char *slash = strrchr(new_filename, '/');
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| 158 | if (slash) {
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| 159 | /* Create leading directories */
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| 160 | *slash = '\0';
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| 161 | bb_make_directory(new_filename, -1, FILEUTILS_RECUR);
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| 162 | *slash = '/';
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| 163 | }
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| 164 | src_stream = NULL;
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| 165 | saved_stat.st_mode = 0644;
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| 166 | } else if (!(opt & OPT_dry_run)) {
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| 167 | backup_filename = xasprintf("%s.orig", new_filename);
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| 168 | xrename(new_filename, backup_filename);
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| 169 | src_stream = xfopen_for_read(backup_filename);
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| 170 | } else
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| 171 | src_stream = xfopen_for_read(new_filename);
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| 172 |
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| 173 | if (opt & OPT_dry_run) {
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| 174 | dst_stream = xfopen_for_write("/dev/null");
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| 175 | } else {
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| 176 | dst_stream = xfopen_for_write(new_filename);
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| 177 | fchmod(fileno(dst_stream), saved_stat.st_mode);
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| 178 | }
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| 179 |
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| 180 | printf("patching file %s\n", new_filename);
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| 181 |
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| 182 | /* Handle all hunks for this file */
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| 183 | patch_line = xmalloc_fgets(patch_file);
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| 184 | while (patch_line) {
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| 185 | unsigned count;
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| 186 | unsigned src_beg_line;
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| 187 | unsigned hunk_offset_start;
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| 188 | unsigned src_last_line = 1;
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| 189 | unsigned dst_last_line = 1;
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| 190 |
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| 191 | if ((sscanf(patch_line, "@@ -%u,%u +%u,%u", &src_beg_line, &src_last_line, &dst_beg_line, &dst_last_line) < 3)
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| 192 | && (sscanf(patch_line, "@@ -%u +%u,%u", &src_beg_line, &dst_beg_line, &dst_last_line) < 2)
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| 193 | ) {
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| 194 | /* No more hunks for this file */
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| 195 | break;
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| 196 | }
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| 197 | if (plus != '+') {
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| 198 | /* reverse patch */
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| 199 | unsigned tmp = src_last_line;
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| 200 | src_last_line = dst_last_line;
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| 201 | dst_last_line = tmp;
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| 202 | tmp = src_beg_line;
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| 203 | src_beg_line = dst_beg_line;
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| 204 | dst_beg_line = tmp;
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| 205 | }
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| 206 | hunk_count++;
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| 207 |
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| 208 | if (src_beg_line && dst_beg_line) {
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| 209 | /* Copy unmodified lines upto start of hunk */
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| 210 | /* src_beg_line will be 0 if it's a new file */
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| 211 | count = src_beg_line - src_cur_line;
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| 212 | if (copy_lines(src_stream, dst_stream, count)) {
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| 213 | bb_error_msg_and_die("bad src file");
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| 214 | }
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| 215 | src_cur_line += count;
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| 216 | dst_cur_line += count;
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| 217 | copy_trailing_lines_flag = 1;
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| 218 | }
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| 219 | src_last_line += hunk_offset_start = src_cur_line;
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| 220 | dst_last_line += dst_cur_line;
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| 221 |
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| 222 | while (1) {
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| 223 | free(patch_line);
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| 224 | patch_line = xmalloc_fgets(patch_file);
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| 225 | if (patch_line == NULL)
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| 226 | break; /* EOF */
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| 227 | if (!*patch_line) {
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| 228 | /* whitespace-damaged patch with "" lines */
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| 229 | free(patch_line);
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| 230 | patch_line = xstrdup(" ");
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| 231 | }
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| 232 | if ((*patch_line != '-') && (*patch_line != '+')
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| 233 | && (*patch_line != ' ')
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| 234 | ) {
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| 235 | break; /* End of hunk */
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| 236 | }
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| 237 | if (*patch_line != plus) { /* '-' or ' ' */
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| 238 | char *src_line = NULL;
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| 239 | if (src_cur_line == src_last_line)
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| 240 | break;
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| 241 | if (src_stream) {
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| 242 | src_line = xmalloc_fgets(src_stream);
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| 243 | if (src_line) {
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| 244 | int diff = strcmp(src_line, patch_line + 1);
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| 245 | src_cur_line++;
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| 246 | free(src_line);
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| 247 | if (diff)
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| 248 | src_line = NULL;
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| 249 | }
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| 250 | }
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| 251 | /* Do not patch an already patched hunk with -N */
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| 252 | if (src_line == 0 && (opt & OPT_N)) {
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| 253 | continue;
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| 254 | }
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| 255 | if (!src_line) {
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| 256 | bb_error_msg("hunk #%u FAILED at %u", hunk_count, hunk_offset_start);
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| 257 | bad_hunk_count++;
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| 258 | break;
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| 259 | }
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| 260 | if (*patch_line != ' ') { /* '-' */
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| 261 | continue;
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| 262 | }
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| 263 | }
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| 264 | if (dst_cur_line == dst_last_line)
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| 265 | break;
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| 266 | fputs(patch_line + 1, dst_stream);
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| 267 | dst_cur_line++;
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| 268 | } /* end of while loop handling one hunk */
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| 269 | } /* end of while loop handling one file */
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| 270 |
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| 271 | /* Cleanup last patched file */
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| 272 | if (copy_trailing_lines_flag) {
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| 273 | copy_lines(src_stream, dst_stream, (unsigned)(-1));
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| 274 | }
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| 275 | if (src_stream) {
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| 276 | fclose(src_stream);
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| 277 | }
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| 278 | fclose(dst_stream);
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| 279 | if (bad_hunk_count) {
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| 280 | ret = 1;
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| 281 | bb_error_msg("%u out of %u hunk FAILED", bad_hunk_count, hunk_count);
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| 282 | } else {
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| 283 | /* It worked, we can remove the backup */
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| 284 | if (backup_filename) {
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| 285 | unlink(backup_filename);
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| 286 | }
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| 287 | if (!(opt & OPT_dry_run)
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| 288 | && ((dst_cur_line == 0) || (dst_beg_line == 0))
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| 289 | ) {
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| 290 | /* The new patched file is empty, remove it */
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| 291 | xunlink(new_filename);
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| 292 | // /* old_filename and new_filename may be the same file */
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| 293 | // unlink(old_filename);
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| 294 | }
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| 295 | }
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| 296 | free(backup_filename);
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| 297 | //free(old_filename);
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| 298 | free(new_filename);
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| 299 | } /* end of "while there are patch lines" */
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| 300 | quit:
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| 301 | /* 0 = SUCCESS
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| 302 | * 1 = Some hunks failed
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| 303 | * 2 = More serious problems (exited earlier)
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| 304 | */
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| 305 | return ret;
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| 306 | }
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