Klas Lindfors
144 lines
4.1 KiB
C
144 lines
4.1 KiB
C
/*
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* Copyright (c) 2014 Yubico AB
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "ykpiv-version.h"
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#include <stddef.h>
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#include <string.h>
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/* From http://article.gmane.org/gmane.os.freebsd.devel.hackers/23606 */
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static int my_strverscmp (const char *s1, const char *s2)
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{
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static const char *digits = "0123456789";
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size_t p1, p2;
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p1 = strcspn (s1, digits);
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p2 = strcspn (s2, digits);
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while (p1 == p2 && s1[p1] != '\0' && s2[p2] != '\0') {
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int ret, lz1, lz2;
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/* Different prefix */
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if ((ret = strncmp (s1, s2, p1)) != 0)
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return ret;
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s1 += p1;
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s2 += p2;
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lz1 = lz2 = 0;
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if (*s1 == '0')
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lz1 = 1;
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if (*s2 == '0')
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lz2 = 1;
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if (lz1 > lz2)
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return -1;
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else if (lz1 < lz2)
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return 1;
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else if (lz1 == 1) {
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/*
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* If the common prefix for s1 and s2 consists only of zeros, then the
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* "longer" number has to compare less. Otherwise the comparison needs
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* to be numerical (just fallthrough). See
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* http://refspecs.freestandards.org/LSB_2.0.1/LSB-generic/
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* LSB-generic/baselib-strverscmp.html
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*/
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while (*s1 == '0' && *s2 == '0') {
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++s1;
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++s2;
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}
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p1 = strspn (s1, digits);
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p2 = strspn (s2, digits);
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/* Catch empty strings */
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if (p1 == 0 && p2 > 0)
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return 1;
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else if (p2 == 0 && p1 > 0)
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return -1;
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/* Prefixes are not same */
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if (*s1 != *s2 && *s1 != '0' && *s2 != '0') {
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if (p1 < p2)
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return 1;
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else if (p1 > p2)
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return -1;
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} else {
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if (p1 < p2)
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ret = strncmp (s1, s2, p1);
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else if (p1 > p2)
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ret = strncmp (s1, s2, p2);
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if (ret != 0)
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return ret;
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}
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}
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p1 = strspn (s1, digits);
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p2 = strspn (s2, digits);
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if (p1 < p2)
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return -1;
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else if (p1 > p2)
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return 1;
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else if ((ret = strncmp (s1, s2, p1)) != 0)
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return ret;
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/* Numbers are equal or not present, try with next ones. */
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s1 += p1;
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s2 += p2;
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p1 = strcspn (s1, digits);
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p2 = strcspn (s2, digits);
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}
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return strcmp (s1, s2);
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}
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/**
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* ykpiv_check_version:
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* @req_version: Required version number, or NULL.
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*
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* Check that the version of the library is at minimum the requested
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* one and return the version string; return NULL if the condition is
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* not satisfied. If a NULL is passed to this function, no check is
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* done, but the version string is simply returned.
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*
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* See %YKPIV_VERSION_STRING for a suitable @req_version string.
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*
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* Return value: Version string of run-time library, or NULL if the
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* run-time library does not meet the required version number.
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*/
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const char * ykpiv_check_version (const char *req_version)
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{
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if (!req_version
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|| my_strverscmp (req_version, YKPIV_VERSION_STRING) <= 0)
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return YKPIV_VERSION_STRING;
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return NULL;
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}
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