Function parse_padding_placeholder

pretty.c:1115–1193

}

static size_t parse_padding_placeholder(const char *placeholder,
					struct format_commit_context *c)
{
	const char *ch = placeholder;
	enum flush_type flush_type;
	int to_column = 0;

	switch (*ch++) {
	case '<':
		flush_type = flush_right;
		break;
	case '>':
		if (*ch == '<') {
			flush_type = flush_both;
			ch++;
		} else if (*ch == '>') {
			flush_type = flush_left_and_steal;
			ch++;
		} else
			flush_type = flush_left;
		break;
	default:
		return 0;
	}

	/* the next value means "wide enough to that column" */
	if (*ch == '|') {
		to_column = 1;
		ch++;
	}

	if (*ch == '(') {
		const char *start = ch + 1;
		const char *end = start + strcspn(start, ",)");
		char *next;
		int width;
		if (!*end || end == start)
			return 0;
		width = strtol(start, &next, 10);

		/*
		 * We need to limit the amount of padding, or otherwise this
		 * would allow the user to pad the buffer by arbitrarily many
		 * bytes and thus cause resource exhaustion.
		 */
		if (width < -FORMATTING_LIMIT || width > FORMATTING_LIMIT)
			return 0;

		if (next == start || width == 0)
			return 0;
		if (width < 0) {
			if (to_column)
				width += term_columns();
			if (width < 0)
				return 0;
		}
		c->padding = to_column ? -width : width;
		c->flush_type = flush_type;