| /* vi: set sw=4 ts=4: */ |
| /* |
| * busybox patch applet to handle the unified diff format. |
| * Copyright (C) 2003 Glenn McGrath <bug1@iinet.net.au> |
| * |
| * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
| * |
| * This applet is written to work with patches generated by GNU diff, |
| * where there is equivalent functionality busybox patch shall behave |
| * as per GNU patch. |
| * |
| * There is a SUSv3 specification for patch, however it looks to be |
| * incomplete, it doesnt even mention unified diff format. |
| * http://www.opengroup.org/onlinepubs/007904975/utilities/patch.html |
| * |
| * Issues |
| * - Non-interactive |
| * - Patches must apply cleanly or the hunk will fail. |
| * - Reject file isnt saved |
| * - |
| */ |
| |
| #include <getopt.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include "busybox.h" |
| |
| static unsigned int copy_lines(FILE *src_stream, FILE *dest_stream, const unsigned int lines_count) |
| { |
| unsigned int i = 0; |
| |
| while (src_stream && (i < lines_count)) { |
| char *line; |
| line = bb_get_line_from_file(src_stream); |
| if (line == NULL) { |
| break; |
| } |
| if (fputs(line, dest_stream) == EOF) { |
| bb_perror_msg_and_die("Error writing to new file"); |
| } |
| free(line); |
| |
| i++; |
| } |
| return(i); |
| } |
| |
| /* If patch_level is -1 it will remove all directory names |
| * char *line must be greater than 4 chars |
| * returns NULL if the file doesnt exist or error |
| * returns malloc'ed filename |
| */ |
| |
| static char *extract_filename(char *line, int patch_level) |
| { |
| char *filename_start_ptr = line + 4; |
| int i; |
| |
| /* Terminate string at end of source filename */ |
| { |
| char *line_ptr; |
| line_ptr = strchr(filename_start_ptr, '\t'); |
| if (!line_ptr) { |
| bb_perror_msg("Malformed line %s", line); |
| return(NULL); |
| } |
| *line_ptr = '\0'; |
| } |
| |
| /* Skip over (patch_level) number of leading directories */ |
| for (i = 0; i < patch_level; i++) { |
| char *dirname_ptr; |
| |
| dirname_ptr = strchr(filename_start_ptr, '/'); |
| if (!dirname_ptr) { |
| break; |
| } |
| filename_start_ptr = dirname_ptr + 1; |
| } |
| |
| return(bb_xstrdup(filename_start_ptr)); |
| } |
| |
| static int file_doesnt_exist(const char *filename) |
| { |
| struct stat statbuf; |
| return(stat(filename, &statbuf)); |
| } |
| |
| int patch_main(int argc, char **argv) |
| { |
| int patch_level = -1; |
| char *patch_line; |
| int ret; |
| FILE *patch_file = NULL; |
| |
| { |
| char *p, *i; |
| ret = bb_getopt_ulflags(argc, argv, "p:i:", &p, &i); |
| if (ret & 1) |
| patch_level = bb_xgetlarg(p, 10, -1, USHRT_MAX); |
| if (ret & 2) { |
| patch_file = bb_xfopen(i, "r"); |
| } else { |
| patch_file = stdin; |
| } |
| ret = 0; |
| } |
| |
| patch_line = bb_get_line_from_file(patch_file); |
| while (patch_line) { |
| FILE *src_stream; |
| FILE *dst_stream; |
| char *original_filename; |
| char *new_filename; |
| char *backup_filename; |
| unsigned int src_cur_line = 1; |
| unsigned int dest_cur_line = 0; |
| unsigned int dest_beg_line; |
| unsigned int bad_hunk_count = 0; |
| unsigned int hunk_count = 0; |
| char copy_trailing_lines_flag = 0; |
| |
| /* Skip everything upto the "---" marker |
| * No need to parse the lines "Only in <dir>", and "diff <args>" |
| */ |
| while (patch_line && strncmp(patch_line, "--- ", 4) != 0) { |
| free(patch_line); |
| patch_line = bb_get_line_from_file(patch_file); |
| } |
| |
| /* Extract the filename used before the patch was generated */ |
| original_filename = extract_filename(patch_line, patch_level); |
| free(patch_line); |
| |
| patch_line = bb_get_line_from_file(patch_file); |
| if (strncmp(patch_line, "+++ ", 4) != 0) { |
| ret = 2; |
| bb_error_msg("Invalid patch"); |
| continue; |
| } |
| new_filename = extract_filename(patch_line, patch_level); |
| free(patch_line); |
| |
| if (file_doesnt_exist(new_filename)) { |
| char *line_ptr; |
| /* Create leading directories */ |
| line_ptr = strrchr(new_filename, '/'); |
| if (line_ptr) { |
| *line_ptr = '\0'; |
| bb_make_directory(new_filename, -1, FILEUTILS_RECUR); |
| *line_ptr = '/'; |
| } |
| dst_stream = bb_xfopen(new_filename, "w+"); |
| backup_filename = NULL; |
| } else { |
| backup_filename = xmalloc(strlen(new_filename) + 6); |
| strcpy(backup_filename, new_filename); |
| strcat(backup_filename, ".orig"); |
| if (rename(new_filename, backup_filename) == -1) { |
| bb_perror_msg_and_die("Couldnt create file %s", |
| backup_filename); |
| } |
| dst_stream = bb_xfopen(new_filename, "w"); |
| } |
| |
| if ((backup_filename == NULL) || file_doesnt_exist(original_filename)) { |
| src_stream = NULL; |
| } else { |
| if (strcmp(original_filename, new_filename) == 0) { |
| src_stream = bb_xfopen(backup_filename, "r"); |
| } else { |
| src_stream = bb_xfopen(original_filename, "r"); |
| } |
| } |
| |
| printf("patching file %s\n", new_filename); |
| |
| /* Handle each hunk */ |
| patch_line = bb_get_line_from_file(patch_file); |
| while (patch_line) { |
| unsigned int count; |
| unsigned int src_beg_line; |
| unsigned int unused; |
| unsigned int hunk_offset_start = 0; |
| int hunk_error = 0; |
| |
| /* This bit should be improved */ |
| if ((sscanf(patch_line, "@@ -%d,%d +%d,%d @@", &src_beg_line, &unused, &dest_beg_line, &unused) != 4) && |
| (sscanf(patch_line, "@@ -%d,%d +%d @@", &src_beg_line, &unused, &dest_beg_line) != 3) && |
| (sscanf(patch_line, "@@ -%d +%d,%d @@", &src_beg_line, &dest_beg_line, &unused) != 3)) { |
| /* No more hunks for this file */ |
| break; |
| } |
| free(patch_line); |
| hunk_count++; |
| |
| if (src_beg_line && dest_beg_line) { |
| /* Copy unmodified lines upto start of hunk */ |
| /* src_beg_line will be 0 if its a new file */ |
| count = src_beg_line - src_cur_line; |
| if (copy_lines(src_stream, dst_stream, count) != count) { |
| bb_error_msg_and_die("Bad src file"); |
| } |
| src_cur_line += count; |
| dest_cur_line += count; |
| copy_trailing_lines_flag = 1; |
| } |
| hunk_offset_start = src_cur_line; |
| |
| while ((patch_line = bb_get_line_from_file(patch_file)) != NULL) { |
| if ((*patch_line == '-') || (*patch_line == ' ')) { |
| char *src_line = NULL; |
| if (src_stream) { |
| src_line = bb_get_line_from_file(src_stream); |
| if (!src_line) { |
| hunk_error++; |
| break; |
| } else { |
| src_cur_line++; |
| } |
| if (strcmp(src_line, patch_line + 1) != 0) { |
| bb_error_msg("Hunk #%d FAILED at %d.", hunk_count, hunk_offset_start); |
| hunk_error++; |
| free(patch_line); |
| break; |
| } |
| free(src_line); |
| } |
| if (*patch_line == ' ') { |
| fputs(patch_line + 1, dst_stream); |
| dest_cur_line++; |
| } |
| } else if (*patch_line == '+') { |
| fputs(patch_line + 1, dst_stream); |
| dest_cur_line++; |
| } else { |
| break; |
| } |
| free(patch_line); |
| } |
| if (hunk_error) { |
| bad_hunk_count++; |
| } |
| } |
| |
| /* Cleanup last patched file */ |
| if (copy_trailing_lines_flag) { |
| copy_lines(src_stream, dst_stream, -1); |
| } |
| if (src_stream) { |
| fclose(src_stream); |
| } |
| if (dst_stream) { |
| fclose(dst_stream); |
| } |
| if (bad_hunk_count) { |
| if (!ret) { |
| ret = 1; |
| } |
| bb_error_msg("%d out of %d hunk FAILED", bad_hunk_count, hunk_count); |
| } else { |
| /* It worked, we can remove the backup */ |
| if (backup_filename) { |
| unlink(backup_filename); |
| } |
| if ((dest_cur_line == 0) || (dest_beg_line == 0)) { |
| /* The new patched file is empty, remove it */ |
| if (unlink(new_filename) == -1) { |
| bb_perror_msg_and_die("Couldnt remove file %s", new_filename); |
| } |
| if (unlink(original_filename) == -1) { |
| bb_perror_msg_and_die("Couldnt remove original file %s", new_filename); |
| } |
| } |
| } |
| } |
| |
| /* 0 = SUCCESS |
| * 1 = Some hunks failed |
| * 2 = More serious problems |
| */ |
| return(ret); |
| } |
