Function find_trailer_block_start

trailer.c:886–979

* Return the position of the first trailer line or len if there are no * trailers. */

 * trailers.
 */
static size_t find_trailer_block_start(const char *buf, size_t len)
{
	const char *s;
	ssize_t end_of_title, l;
	int only_spaces = 1;
	int recognized_prefix = 0, trailer_lines = 0, non_trailer_lines = 0;
	/*
	 * Number of possible continuation lines encountered. This will be
	 * reset to 0 if we encounter a trailer (since those lines are to be
	 * considered continuations of that trailer), and added to
	 * non_trailer_lines if we encounter a non-trailer (since those lines
	 * are to be considered non-trailers).
	 */
	int possible_continuation_lines = 0;

	/* The first paragraph is the title and cannot be trailers */
	for (s = buf; s < buf + len; s = next_line(s)) {
		if (starts_with_mem(s, buf + len - s, comment_line_str))
			continue;
		if (is_blank_line(s))
			break;
	}
	end_of_title = s - buf;

	/*
	 * Get the start of the trailers by looking starting from the end for a
	 * blank line before a set of non-blank lines that (i) are all
	 * trailers, or (ii) contains at least one Git-generated trailer and
	 * consists of at least 25% trailers.
	 */
	for (l = last_line(buf, len);
	     l >= end_of_title;
	     l = last_line(buf, l)) {
		const char *bol = buf + l;
		const char **p;
		ssize_t separator_pos;

		if (starts_with_mem(bol, buf + len - bol, comment_line_str)) {
			non_trailer_lines += possible_continuation_lines;
			possible_continuation_lines = 0;
			continue;
		}
		if (is_blank_line(bol)) {
			if (only_spaces)
				continue;
			non_trailer_lines += possible_continuation_lines;
			if (recognized_prefix &&
			    trailer_lines * 3 >= non_trailer_lines)
				return next_line(bol) - buf;
			else if (trailer_lines && !non_trailer_lines)
				return next_line(bol) - buf;
			return len;
		}
		only_spaces = 0;

		for (p = git_generated_prefixes; *p; p++) {
			if (starts_with(bol, *p)) {
				trailer_lines++;