Function get_oid_1

object-name.c:1084–1142

}

static enum get_oid_result get_oid_1(struct repository *r,
				     const char *name, int len,
				     struct object_id *oid,
				     unsigned lookup_flags)
{
	int ret, has_suffix;
	const char *cp;

	/*
	 * "name~3" is "name^^^", "name~" is "name~1", and "name^" is "name^1".
	 */
	has_suffix = 0;
	for (cp = name + len - 1; name <= cp; cp--) {
		int ch = *cp;
		if ('0' <= ch && ch <= '9')
			continue;
		if (ch == '~' || ch == '^')
			has_suffix = ch;
		break;
	}

	if (has_suffix) {
		unsigned int num = 0;
		int len1 = cp - name;
		cp++;
		while (cp < name + len) {
			unsigned int digit = *cp++ - '0';
			if (unsigned_mult_overflows(num, 10))
				return MISSING_OBJECT;
			num *= 10;
			if (unsigned_add_overflows(num, digit))
				return MISSING_OBJECT;
			num += digit;
		}
		if (!num && len1 == len - 1)
			num = 1;
		else if (num > INT_MAX)
			return MISSING_OBJECT;
		if (has_suffix == '^')
			return get_parent(r, name, len1, oid, num);
		/* else if (has_suffix == '~') -- goes without saying */
		return get_nth_ancestor(r, name, len1, oid, num);
	}

	ret = peel_onion(r, name, len, oid, lookup_flags);
	if (!ret)
		return FOUND;

	ret = get_oid_basic(r, name, len, oid, lookup_flags);
	if (!ret)
		return FOUND;

	/* It could be describe output that is "SOMETHING-gXXXX" */
	ret = get_describe_name(r, name, len, oid);
	if (!ret)
		return FOUND;

	return get_short_oid(r, name, len, oid, lookup_flags);