Function match_fragment

apply.c:2597–2813

}

static int match_fragment(struct apply_state *state,
			  struct image *img,
			  struct image *preimage,
			  struct image *postimage,
			  unsigned long current,
			  int current_lno,
			  unsigned ws_rule,
			  int match_beginning, int match_end)
{
	int i;
	const char *orig, *target;
	struct strbuf fixed = STRBUF_INIT;
	char *fixed_buf;
	size_t fixed_len;
	int preimage_limit;
	int ret;

	if (preimage->line_nr + current_lno <= img->line_nr) {
		/*
		 * The hunk falls within the boundaries of img.
		 */
		preimage_limit = preimage->line_nr;
		if (match_end && (preimage->line_nr + current_lno != img->line_nr)) {
			ret = 0;
			goto out;
		}
	} else if (state->ws_error_action == correct_ws_error &&
		   (ws_rule & WS_BLANK_AT_EOF)) {
		/*
		 * This hunk extends beyond the end of img, and we are
		 * removing blank lines at the end of the file.  This
		 * many lines from the beginning of the preimage must
		 * match with img, and the remainder of the preimage
		 * must be blank.
		 */
		preimage_limit = img->line_nr - current_lno;
	} else {
		/*
		 * The hunk extends beyond the end of the img and
		 * we are not removing blanks at the end, so we
		 * should reject the hunk at this position.
		 */
		ret = 0;
		goto out;
	}

	if (match_beginning && current_lno) {
		ret = 0;
		goto out;
	}

	/* Quick hash check */
	for (i = 0; i < preimage_limit; i++) {
		if ((img->line[current_lno + i].flag & LINE_PATCHED) ||
		    (preimage->line[i].hash != img->line[current_lno + i].hash)) {
			ret = 0;
			goto out;
		}