118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/****************************************************************************
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* libs/libc/uuid/lib_uuid_from_string.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <inttypes.h>
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#include <stdio.h>
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#include <string.h>
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#include <uuid.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* uuid_from_string
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*
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* Description:
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* convert a string representation of an UUID into a binary representation.
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*
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* See also:
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* http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm
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*
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****************************************************************************/
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void uuid_from_string(FAR const char *s, FAR uuid_t *u, FAR uint32_t *status)
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{
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int n;
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/* Short-circuit 2 special cases: NULL pointer and empty string. */
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if (s == NULL || *s == '\0')
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{
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uuid_create_nil(u, status);
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return;
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}
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/* Assume the worst. */
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if (status != NULL)
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{
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*status = uuid_s_invalid_string_uuid;
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}
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/* The UUID string representation has a fixed length. */
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if (strnlen(s, UUID_STR_LEN + 1) != UUID_STR_LEN)
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{
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return;
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}
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/* We only work with "new" UUIDs. New UUIDs have the form:
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* 01234567-89ab-cdef-0123-456789abcdef
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* The so called "old" UUIDs, which we don't support, have the form:
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* 0123456789ab.cd.ef.01.23.45.67.89.ab
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*/
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if (s[8] != '-')
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{
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return;
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}
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n = sscanf(s,
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"%08" SCNx32 "-%04" SCNx16 "-%04" SCNx16
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"-%02" SCNx8 "%02" SCNx8
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"-%02" SCNx8 "%02" SCNx8 "%02" SCNx8
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"%02" SCNx8 "%02" SCNx8 "%02" SCNx8,
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&u->time_low, &u->time_mid, &u->time_hi_and_version,
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&u->clock_seq_hi_and_reserved, &u->clock_seq_low, &u->node[0],
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&u->node[1], &u->node[2], &u->node[3], &u->node[4], &u->node[5]);
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/* Make sure we have all conversions. */
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if (n != 11)
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{
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return;
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}
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/* We have a successful scan. Check semantics... */
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n = u->clock_seq_hi_and_reserved;
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if ((n & 0x80) != 0x00 && /* variant 0? */
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(n & 0xc0) != 0x80 && /* variant 1? */
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(n & 0xe0) != 0xc0) /* variant 2? */
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{
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if (status != NULL)
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{
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*status = uuid_s_bad_version;
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}
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}
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else
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{
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if (status != NULL)
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{
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*status = uuid_s_ok;
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}
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}
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}
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