[821] | 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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