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307 lines
8.7 KiB
C
307 lines
8.7 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 GPLv2 or later, see file LICENSE in this source tree.
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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 *dst_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, dst_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(char *line, int patch_level, const char *pat)
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{
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char *temp = NULL, *filename_start_ptr = line + 4;
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if (strncmp(line, pat, 4) == 0) {
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/* Terminate string at end of source filename */
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line[strcspn(line, "\t\n\r")] = '\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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}
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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 UNUSED_PARAM, 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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char plus = '+';
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unsigned opt;
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enum {
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OPT_R = (1 << 2),
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OPT_N = (1 << 3),
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/*OPT_f = (1 << 4), ignored */
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/*OPT_E = (1 << 5), ignored, this is the default */
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/*OPT_g = (1 << 6), ignored */
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OPT_dry_run = (1 << 7) * ENABLE_LONG_OPTS,
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};
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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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#if ENABLE_LONG_OPTS
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static const char patch_longopts[] ALIGN1 =
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"strip\0" Required_argument "p"
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"input\0" Required_argument "i"
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"reverse\0" No_argument "R"
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"forward\0" No_argument "N"
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/* "Assume user knows what [s]he is doing, do not ask any questions": */
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"force\0" No_argument "f" /*ignored*/
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# if ENABLE_DESKTOP
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"remove-empty-files\0" No_argument "E" /*ignored*/
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/* "Controls actions when a file is under RCS or SCCS control,
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* and does not exist or is read-only and matches the default version,
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* or when a file is under ClearCase control and does not exist..."
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* IOW: rather obscure option.
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* But Gentoo's portage does use -g0 */
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"get\0" Required_argument "g" /*ignored*/
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# endif
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"dry-run\0" No_argument "\xfd"
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# if ENABLE_DESKTOP
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"backup-if-mismatch\0" No_argument "\xfe" /*ignored*/
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"no-backup-if-mismatch\0" No_argument "\xff" /*ignored*/
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# endif
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;
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applet_long_options = patch_longopts;
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#endif
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/* -f,-E,-g are ignored */
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opt = getopt32(argv, "p:i:RN""fEg:", &p, &i, NULL);
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if (opt & OPT_R)
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plus = '-';
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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_fgetline(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 *old_filename;
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char *new_filename;
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char *backup_filename = NULL;
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unsigned src_cur_line = 1;
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unsigned dst_cur_line = 0;
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unsigned dst_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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do {
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/* Extract the filename used before the patch was generated */
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new_filename = extract_filename(patch_line, patch_level, "--- ");
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// was old_filename above
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patch_line = xmalloc_fgetline(patch_file);
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if (!patch_line) goto quit;
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} while (!new_filename);
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free(new_filename); // "source" filename is irrelevant
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new_filename = extract_filename(patch_line, patch_level, "+++ ");
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if (!new_filename) {
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bb_error_msg_and_die("invalid patch");
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}
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/* Get access rights from the file to be patched */
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if (stat(new_filename, &saved_stat) != 0) {
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char *slash = strrchr(new_filename, '/');
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if (slash) {
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/* Create leading directories */
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*slash = '\0';
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bb_make_directory(new_filename, -1, FILEUTILS_RECUR);
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*slash = '/';
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}
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src_stream = NULL;
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saved_stat.st_mode = 0644;
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} else if (!(opt & OPT_dry_run)) {
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backup_filename = xasprintf("%s.orig", new_filename);
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xrename(new_filename, backup_filename);
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src_stream = xfopen_for_read(backup_filename);
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} else
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src_stream = xfopen_for_read(new_filename);
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if (opt & OPT_dry_run) {
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dst_stream = xfopen_for_write("/dev/null");
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} else {
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dst_stream = xfopen_for_write(new_filename);
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fchmod(fileno(dst_stream), saved_stat.st_mode);
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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 hunk_offset_start;
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unsigned src_last_line = 1;
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unsigned dst_last_line = 1;
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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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&& (sscanf(patch_line, "@@ -%u +%u,%u", &src_beg_line, &dst_beg_line, &dst_last_line) < 2)
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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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if (plus != '+') {
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/* reverse patch */
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unsigned tmp = src_last_line;
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src_last_line = dst_last_line;
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dst_last_line = tmp;
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tmp = src_beg_line;
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src_beg_line = dst_beg_line;
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dst_beg_line = tmp;
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}
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hunk_count++;
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if (src_beg_line && dst_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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dst_cur_line += count;
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copy_trailing_lines_flag = 1;
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}
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src_last_line += hunk_offset_start = src_cur_line;
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dst_last_line += dst_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)
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break; /* EOF */
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if (!*patch_line) {
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/* whitespace-damaged patch with "" lines */
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free(patch_line);
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patch_line = xstrdup(" ");
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}
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if ((*patch_line != '-') && (*patch_line != '+')
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&& (*patch_line != ' ')
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) {
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break; /* End of hunk */
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}
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if (*patch_line != plus) { /* '-' or ' ' */
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char *src_line = NULL;
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if (src_cur_line == src_last_line)
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break;
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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)
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src_line = NULL;
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}
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}
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/* Do not patch an already patched hunk with -N */
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if (src_line == 0 && (opt & OPT_N)) {
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continue;
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}
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if (!src_line) {
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bb_error_msg("hunk #%u FAILED at %u", hunk_count, hunk_offset_start);
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bad_hunk_count++;
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break;
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}
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if (*patch_line != ' ') { /* '-' */
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continue;
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}
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}
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if (dst_cur_line == dst_last_line)
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break;
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fputs(patch_line + 1, dst_stream);
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dst_cur_line++;
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} /* end of while loop handling one hunk */
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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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fclose(dst_stream);
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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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}
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if (!(opt & OPT_dry_run)
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&& ((dst_cur_line == 0) || (dst_beg_line == 0))
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) {
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/* The new patched file is empty, remove it */
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xunlink(new_filename);
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// /* old_filename and new_filename may be the same file */
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// unlink(old_filename);
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}
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}
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free(backup_filename);
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//free(old_filename);
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free(new_filename);
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} /* end of "while there are patch lines" */
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quit:
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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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