247 lines
6.8 KiB
C
247 lines
6.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* busybox patch applet to handle the unified diff format.
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* Copyright (C) 2003 Glenn McGrath
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*
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* This applet is written to work with patches generated by GNU diff,
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* where there is equivalent functionality busybox patch shall behave
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* as per GNU patch.
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*
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* There is a SUSv3 specification for patch, however it looks to be
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* incomplete, it doesnt even mention unified diff format.
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* http://www.opengroup.org/onlinepubs/007904975/utilities/patch.html
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*
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* Issues
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* - Non-interactive
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* - Patches must apply cleanly or patch (not just one hunk) will fail.
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* - Reject file isnt saved
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*/
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#include "libbb.h"
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static unsigned copy_lines(FILE *src_stream, FILE *dest_stream, unsigned lines_count)
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{
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while (src_stream && lines_count) {
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char *line;
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line = xmalloc_fgets(src_stream);
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if (line == NULL) {
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break;
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}
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if (fputs(line, dest_stream) == EOF) {
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bb_perror_msg_and_die("error writing to new file");
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}
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free(line);
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lines_count--;
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}
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return lines_count;
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}
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/* If patch_level is -1 it will remove all directory names
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* char *line must be greater than 4 chars
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* returns NULL if the file doesnt exist or error
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* returns malloc'ed filename
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* NB: frees 1st argument!
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*/
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static char *extract_filename_and_free_line(char *line, int patch_level)
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{
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char *temp, *filename_start_ptr = line + 4;
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/* Terminate string at end of source filename */
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temp = strchrnul(filename_start_ptr, '\t');
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*temp = '\0';
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/* Skip over (patch_level) number of leading directories */
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while (patch_level--) {
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temp = strchr(filename_start_ptr, '/');
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if (!temp)
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break;
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filename_start_ptr = temp + 1;
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}
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temp = xstrdup(filename_start_ptr);
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free(line);
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return temp;
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}
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int patch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
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{
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struct stat saved_stat;
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char *patch_line;
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FILE *patch_file;
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int patch_level;
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int ret = 0;
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xfunc_error_retval = 2;
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{
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const char *p = "-1";
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const char *i = "-"; /* compat */
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getopt32(argv, "p:i:", &p, &i);
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patch_level = xatoi(p); /* can be negative! */
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patch_file = xfopen_stdin(i);
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}
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patch_line = xmalloc_getline(patch_file);
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while (patch_line) {
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FILE *src_stream;
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FILE *dst_stream;
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char *original_filename;
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char *new_filename;
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char *backup_filename;
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unsigned src_cur_line = 1;
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unsigned dest_cur_line = 0;
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unsigned dest_beg_line;
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unsigned bad_hunk_count = 0;
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unsigned hunk_count = 0;
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smallint copy_trailing_lines_flag = 0;
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/* Skip everything upto the "---" marker
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* No need to parse the lines "Only in <dir>", and "diff <args>"
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*/
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while (strncmp(patch_line, "--- ", 4) != 0) {
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free(patch_line);
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patch_line = xmalloc_getline(patch_file);
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if (!patch_line)
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bb_error_msg_and_die("invalid patch");
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}
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/* Extract the filename used before the patch was generated */
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original_filename = extract_filename_and_free_line(patch_line, patch_level);
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patch_line = xmalloc_getline(patch_file);
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if (!patch_line || strncmp(patch_line, "+++ ", 4) != 0)
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bb_error_msg_and_die("invalid patch");
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new_filename = extract_filename_and_free_line(patch_line, patch_level);
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/* Get access rights from the file to be patched, -1 file does not exist */
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if (stat(new_filename, &saved_stat) != 0) {
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char *line_ptr;
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/* Create leading directories */
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line_ptr = strrchr(new_filename, '/');
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if (line_ptr) {
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*line_ptr = '\0';
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bb_make_directory(new_filename, -1, FILEUTILS_RECUR);
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*line_ptr = '/';
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}
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backup_filename = NULL;
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saved_stat.st_mode = 0644;
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} else {
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backup_filename = xasprintf("%s.orig", new_filename);
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xrename(new_filename, backup_filename);
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}
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dst_stream = xfopen(new_filename, "w");
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fchmod(fileno(dst_stream), saved_stat.st_mode);
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src_stream = NULL;
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if (backup_filename && !stat(original_filename, &saved_stat)) {
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src_stream = xfopen((strcmp(original_filename, new_filename)) ?
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original_filename : backup_filename, "r");
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}
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printf("patching file %s\n", new_filename);
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/* Handle all hunks for this file */
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patch_line = xmalloc_fgets(patch_file);
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while (patch_line) {
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unsigned count;
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unsigned src_beg_line;
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unsigned unused;
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unsigned hunk_offset_start = 0;
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smallint hunk_error = 0;
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/* This bit should be improved */
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if ((sscanf(patch_line, "@@ -%d,%d +%d,%d @@", &src_beg_line, &unused, &dest_beg_line, &unused) != 4)
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&& (sscanf(patch_line, "@@ -%d,%d +%d @@", &src_beg_line, &unused, &dest_beg_line) != 3)
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&& (sscanf(patch_line, "@@ -%d +%d,%d @@", &src_beg_line, &dest_beg_line, &unused) != 3)
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) {
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/* No more hunks for this file */
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break;
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}
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hunk_count++;
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if (src_beg_line && dest_beg_line) {
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/* Copy unmodified lines upto start of hunk */
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/* src_beg_line will be 0 if it's a new file */
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count = src_beg_line - src_cur_line;
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if (copy_lines(src_stream, dst_stream, count)) {
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bb_error_msg_and_die("bad src file");
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}
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src_cur_line += count;
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dest_cur_line += count;
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copy_trailing_lines_flag = 1;
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}
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hunk_offset_start = src_cur_line;
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while (1) {
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free(patch_line);
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patch_line = xmalloc_fgets(patch_file);
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if (patch_line == NULL) break;
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if ((*patch_line == '-') || (*patch_line == ' ')) {
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char *src_line = NULL;
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if (src_stream) {
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src_line = xmalloc_fgets(src_stream);
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if (src_line) {
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int diff = strcmp(src_line, patch_line + 1);
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src_cur_line++;
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free(src_line);
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if (diff) src_line = NULL;
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}
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if (!src_line) {
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bb_error_msg("hunk #%d FAILED at %d", hunk_count, hunk_offset_start);
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hunk_error = 1;
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break;
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}
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}
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if (*patch_line == ' ') {
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fputs(patch_line + 1, dst_stream);
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dest_cur_line++;
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}
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} else if (*patch_line == '+') {
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fputs(patch_line + 1, dst_stream);
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dest_cur_line++;
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} else {
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break;
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}
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} /* end of while loop handling one hunk */
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if (hunk_error) {
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bad_hunk_count++;
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}
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} /* end of while loop handling one file */
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/* Cleanup last patched file */
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if (copy_trailing_lines_flag) {
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copy_lines(src_stream, dst_stream, (unsigned)(-1));
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}
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if (src_stream) {
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fclose(src_stream);
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}
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if (dst_stream) {
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fclose(dst_stream);
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}
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if (bad_hunk_count) {
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ret = 1;
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bb_error_msg("%u out of %u hunk FAILED", bad_hunk_count, hunk_count);
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} else {
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/* It worked, we can remove the backup */
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if (backup_filename) {
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unlink(backup_filename);
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free(backup_filename);
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}
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if ((dest_cur_line == 0) || (dest_beg_line == 0)) {
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/* The new patched file is empty, remove it */
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xunlink(new_filename);
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if (strcmp(new_filename, original_filename) != 0)
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xunlink(original_filename);
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}
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}
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} /* end of "while there are patch lines" */
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/* 0 = SUCCESS
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* 1 = Some hunks failed
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* 2 = More serious problems (exited earlier)
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*/
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return ret;
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}
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