Function apply_patch

apply.c:4870–5009

* Try to apply a patch. * * Returns: * -128 if a bad error happened (like patch unreadable) * -1 if patch did not apply and user cannot deal with it * 0 if the patch applied * 1 if the patch did not apply but user might fix it */

 *   1 if the patch did not apply but user might fix it
 */
static int apply_patch(struct apply_state *state,
		       int fd,
		       const char *filename,
		       int options)
{
	size_t offset;
	struct strbuf buf = STRBUF_INIT; /* owns the patch text */
	struct patch *list = NULL, **listp = &list;
	int skipped_patch = 0;
	int res = 0;
	int flush_attributes = 0;

	state->patch_input_file = filename;
	state->linenr = 1;
	if (read_patch_file(&buf, fd) < 0) {
		res = -128;
		goto end;
	}
	offset = 0;
	while (offset < buf.len) {
		struct patch *patch;
		int nr;

		CALLOC_ARRAY(patch, 1);
		patch->inaccurate_eof = !!(options & APPLY_OPT_INACCURATE_EOF);
		patch->recount =  !!(options & APPLY_OPT_RECOUNT);
		nr = parse_chunk(state, buf.buf + offset, buf.len - offset, patch);
		if (nr < 0) {
			free_patch(patch);
			if (nr == -128) {
				res = -128;
				goto end;
			}
			break;
		}
		if (state->apply_in_reverse)
			reverse_patches(patch);
		if (use_patch(state, patch)) {
			patch_stats(state, patch);
			if (!list || !state->apply_in_reverse) {
				*listp = patch;
				listp = &patch->next;
			} else {
				patch->next = list;
				list = patch;
			}

			if ((patch->new_name &&
			     ends_with_path_components(patch->new_name,
						       GITATTRIBUTES_FILE)) ||
			    (patch->old_name &&
			     ends_with_path_components(patch->old_name,
						       GITATTRIBUTES_FILE)))
				flush_attributes = 1;
		}
		else {
			if (state->apply_verbosity > verbosity_normal)
				say_patch_name(stderr, _("Skipped patch '%s'."), patch);