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/* Copyright (C) 2009 Codership Oy <info@codersihp.com>
This program 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; version 2 of the License.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*! @file Helper functions to deal with history UUID string representations */
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include "wsrep_api.h"
/*!
* Read UUID from string
* @return length of UUID string representation or -EINVAL in case of error
*/
ssize_t
wsrep_uuid_scan (const char* str, size_t str_len, wsrep_uuid_t* uuid)
{
size_t uuid_len = 0;
size_t uuid_offt = 0;
while (uuid_len + 1 < str_len) {
if ((4 == uuid_offt || 6 == uuid_offt || 8 == uuid_offt ||
10 == uuid_offt) && 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
sscanf (str + uuid_len, "%2hhx", uuid->uuid + uuid_offt);
uuid_len += 2;
uuid_offt += 1;
if (sizeof (uuid->uuid) == uuid_offt)
return uuid_len;
}
else {
break;
}
}
*uuid = WSREP_UUID_UNDEFINED;
return -EINVAL;
}
/*!
* Write UUID to string
* @return length of UUID string representation or -EMSGSIZE if string is too
* short
*/
ssize_t
wsrep_uuid_print (const wsrep_uuid_t* uuid, char* str, size_t str_len)
{
if (str_len > 36) {
const unsigned char* u = uuid->uuid;
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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