Function get_buf

lib_acl/src/stdlib/acl_mylog.c:709–760

#ifdef	ACL_UNIX

static char *get_buf(const char *prefix, const char *fmt, va_list ap,
	const char *suffix, size_t *len)
{
	va_list ap_tmp;
	char  *buf, *ptr;
	size_t prefix_len = strlen(prefix);
	size_t suffix_len = suffix ? strlen(suffix) : 0;
	size_t total_len, left_len;
	int    ret;

	total_len = prefix_len + 1024;
	buf = (char*) malloc(total_len);
	acl_assert(buf);

	strcpy(buf, prefix);
	ptr = buf + prefix_len;
	left_len = total_len - prefix_len;
	va_copy(ap_tmp, ap);
	ret = vsnprintf(ptr, left_len, fmt, ap_tmp);
	acl_assert(ret > 0);

	*len = prefix_len + ret;

	if (ret >= (int) left_len) {
		total_len = prefix_len + ret + 1;
		buf = (char*) realloc(buf, total_len);
		acl_assert(buf);

		ptr = buf + prefix_len;
		left_len = total_len - prefix_len;
		va_copy(ap_tmp, ap);
		ret = vsnprintf(ptr, left_len, fmt, ap_tmp);
		acl_assert(ret > 0 && ret < (int) left_len);
	}

	if (suffix_len == 0) {
		return buf;
	}

	*len = *len + suffix_len;
	if (*len >= total_len) {
		total_len = *len + 1;
		buf = (char*) realloc(buf, total_len);
		acl_assert(buf);
	}

	ptr = buf + prefix_len + ret;
	memcpy(ptr, suffix, suffix_len);
	ptr[suffix_len] = 0;

	return buf;
}

#else