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/* version.c - Version checking
* Copyright (C) 2001, 2002, 2012 g10 Code GmbH
*
* This file is part of KSBA.
*
* KSBA is free software; you can redistribute it and/or modify
* it under the terms of either
*
* - the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* or
*
* - 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.
*
* or both in parallel, as here.
*
* KSBA 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 copies of the GNU General Public License
* and the GNU Lesser General Public License along with this program;
* if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
static const char*
parse_version_number (const char *s, int *number)
{
int val = 0;
if (*s == '0' && digitp (s+1))
return NULL; /* Leading zeros are not allowed. */
for (; digitp (s); s++)
{
val *= 10;
val += *s - '0';
}
*number = val;
return val < 0 ? NULL : s;
}
static const char *
parse_version_string (const char *s, int *major, int *minor, int *micro)
{
s = parse_version_number (s, major);
if (!s || *s != '.')
return NULL;
s++;
s = parse_version_number (s, minor);
if (!s || *s != '.')
return NULL;
s++;
s = parse_version_number (s, micro);
if (!s)
return NULL;
return s; /* Patchlevel. */
}
static const char *
compare_versions (const char *my_version, const char *req_version)
{
int my_major, my_minor, my_micro;
int rq_major, rq_minor, rq_micro;
const char *my_plvl, *rq_plvl;
if (!req_version)
return my_version;
if (!my_version)
return NULL;
my_plvl = parse_version_string (my_version, &my_major, &my_minor, &my_micro);
if (!my_plvl)
return NULL; /* Very strange: our own version is bogus. */
rq_plvl = parse_version_string(req_version,
&rq_major, &rq_minor, &rq_micro);
if (!rq_plvl)
return NULL; /* Requested version string is invalid. */
if (my_major > rq_major
|| (my_major == rq_major && my_minor > rq_minor)
|| (my_major == rq_major && my_minor == rq_minor
&& my_micro > rq_micro)
|| (my_major == rq_major && my_minor == rq_minor
&& my_micro == rq_micro))
{
return my_version;
}
return NULL;
}
/**
* ksba_check_version:
* @req_version: A string with a version
*
* Check that the the version of the library is at minimum the requested one
* and return the version string; return NULL if the condition is not
* met. If a NULL is passed to this function, no check is done and
* the version string is simply returned. It is a pretty good idea to
* run this function as soon as possible, because it also intializes
* some subsystems. In a multithreaded environment if should be called
* before the first thread is created.
*
* Return value: The version string or NULL
**/
const char *
ksba_check_version (const char *req_version)
{
/* fixme: if we need global initializations.
Note that these the malloc hook might not have been run yet */
return compare_versions (VERSION, req_version);
}

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