mirror of
https://github.com/FirebirdSQL/firebird.git
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85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
/*
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* PROGRAM: JRD Access Method
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* MODULE: guid.cpp
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* DESCRIPTION: Portable GUID (posix)
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*
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* The contents of this file are subject to the Initial
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* Developer's Public License Version 1.0 (the "License");
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* 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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* http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
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*
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* Software distributed under the License is distributed AS IS,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Original Code was created by Nickolay Samofatov
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2004 Nickolay Samofatov <nickolay@broadviewsoftware.com>
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* and all contributors signed below.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*
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*
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*/
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#include "firebird.h"
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#include "../jrd/os/guid.h"
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#include "fb_exception.h"
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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void GenerateRandomBytes(void* buffer, size_t size)
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{
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// do not use /dev/random because it may return lesser data than we need.
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int fd = -1;
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for (;;) {
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fd = open("/dev/urandom", O_RDONLY);
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if (fd >= 0)
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break;
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if (errno != EINTR)
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Firebird::system_call_failed::raise("open");
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}
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for (size_t offset = 0; offset < size; ) {
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int rc = read(fd, static_cast<char*>(buffer) + offset, size - offset);
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if (rc < 0) {
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if (errno != EINTR)
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Firebird::system_call_failed::raise("read");
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continue;
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}
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if (rc == 0)
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Firebird::system_call_failed::raise("read", EIO);
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offset += static_cast<size_t>(rc);
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}
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if (close(fd) < 0) {
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if (errno != EINTR)
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Firebird::system_call_failed::raise("close");
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// In case when close() is interrupted by a signal,
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// the state of fd is unspecified - give up and return success.
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}
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}
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void GenerateGuid(FB_GUID* guid) {
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GenerateRandomBytes(guid, sizeof(FB_GUID));
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}
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void GuidToString(char* buffer, const FB_GUID* guid) {
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sprintf(buffer, "{%04hX%04hX-%04hX-%04hX-%04hX-%04hX%04hX%04hX}",
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guid->data[0], guid->data[1], guid->data[2], guid->data[3],
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guid->data[4], guid->data[5], guid->data[6], guid->data[7]);
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}
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void StringToGuid(FB_GUID* guid, const char* buffer) {
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sscanf(buffer, "{%04hX%04hX-%04hX-%04hX-%04hX-%04hX%04hX%04hX}",
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&guid->data[0], &guid->data[1], &guid->data[2], &guid->data[3],
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&guid->data[4], &guid->data[5], &guid->data[6], &guid->data[7]);
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}
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