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/* version.c - Version checking
* Copyright (C) 2001, 2002, 2012, 2013, 2014 g10 Code GmbH
*
* This file is part of libgpg-error.
*
* libgpg-error is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* libgpg-error 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <gpg-error.h>
#define digitp(a) ((a) >= '0' && (a) <= '9')
/* This is actually a dummy function to make sure that is module is
not empty. Some compilers barf on empty modules. */
static const char *
cright_blurb (void)
{
static const char blurb[] =
"\n\n"
"This is Libgpg-error " PACKAGE_VERSION " - An error code library\n"
"Copyright 2003, 2004, 2010, 2013, 2014, 2015 g10 Code GmbH\n"
"\n"
"(" BUILD_REVISION " " BUILD_TIMESTAMP ")\n"
"\n\n";
return blurb;
}
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)
{
s = parse_version_number (s, major);
if (!s || *s != '.')
return NULL;
s++;
s = parse_version_number (s, minor);
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;
int rq_major, rq_minor;
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);
if (!my_plvl)
return NULL; /* Very strange: our own version is bogus. */
rq_plvl = parse_version_string(req_version, &rq_major, &rq_minor);
if (!rq_plvl)
return NULL; /* Requested version string is invalid. */
if (my_major > rq_major
|| (my_major == rq_major && my_minor >= rq_minor))
{
return my_version;
}
return NULL;
}
/*
* Check that the the version of the library is at minimum REQ_VERSION
* and return the actual version string; return NULL if the condition
* is not met. If NULL is passed to this function, no check is done
* and the version string is simply returned.
*/
const char *
_gpg_error_check_version (const char *req_version)
{
if (req_version && req_version[0] == 1 && req_version[1] == 1)
return cright_blurb ();
return compare_versions (PACKAGE_VERSION, req_version);
}
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