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/*
* Copyright (C) 2019 Codership Oy <info@codership.com>
*
* This file is part of wsrep-lib.
*
* Wsrep-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* Wsrep-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#include "uuid.hpp"
#include <cstring>
#include <cerrno>
#include <cstdio>
#include <cctype>
int wsrep::uuid_scan (const char* str, size_t str_len, wsrep::uuid_t* uuid)
{
unsigned int uuid_len = 0;
unsigned int uuid_offt = 0;
while (uuid_len + 1 < str_len) {
/* We are skipping potential '-' after uuid_offt == 4, 6, 8, 10
* which means
* (uuid_offt >> 1) == 2, 3, 4, 5,
* which in turn means
* (uuid_offt >> 1) - 2 <= 3
* since it is always >= 0, because uuid_offt is unsigned */
if (((uuid_offt >> 1) - 2) <= 3 && str[uuid_len] == '-') {
// skip dashes after 4th, 6th, 8th and 10th positions
uuid_len += 1;
continue;
}
if (isxdigit(str[uuid_len]) && isxdigit(str[uuid_len + 1])) {
// got hex digit, scan another byte to uuid, increment uuid_offt
sscanf (str + uuid_len, "%2hhx", uuid->data + uuid_offt);
uuid_len += 2;
uuid_offt += 1;
if (sizeof (uuid->data) == uuid_offt)
return static_cast<int>(uuid_len);
}
else {
break;
}
}
*uuid = wsrep::uuid_initializer;
return -EINVAL;
}
int wsrep::uuid_print (const wsrep::uuid_t* uuid, char* str, size_t str_len)
{
if (str_len > WSREP_LIB_UUID_STR_LEN) {
const unsigned char* u = uuid->data;
return snprintf(str, str_len, "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
"%02x%02x-%02x%02x%02x%02x%02x%02x",
u[ 0], u[ 1], u[ 2], u[ 3], u[ 4], u[ 5], u[ 6], u[ 7],
u[ 8], u[ 9], u[10], u[11], u[12], u[13], u[14], u[15]);
}
else {
return -EMSGSIZE;
}
}
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