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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 <https://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 " - A runtime library\n"
"Copyright 2001-2020 g10 Code GmbH\n"
"\n"
"(" BUILD_REVISION " " BUILD_TIMESTAMP ")\n"
"\n\n";
return blurb;
}
/* This function parses the first portion of the version number S and
* stores it at NUMBER. On success, this function returns a pointer
* into S starting with the first character, which is not part of the
* initial number portion; on failure, NULL is returned. */
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;
}
/* This function breaks up the complete string-representation of the
* version number S, which is of the following struture: <major
* number>.<minor number>.<micro number><patch level>. The major,
* minor and micro number components will be stored in *MAJOR, *MINOR
* and *MICRO. If MINOR or MICRO is NULL the version number is
* assumed to have just 1 respective 2 parts.
*
* On success, the last component, the patch level, will be returned;
* in failure, NULL will be returned. */
static const char *
parse_version_string (const char *s, int *major, int *minor, int *micro)
{
s = parse_version_number (s, major);
if (!s)
return NULL;
if (!minor)
{
if (*s == '.')
s++;
}
else
{
if (*s != '.')
return NULL;
s++;
s = parse_version_number (s, minor);
if (!s)
return NULL;
if (!micro)
{
if (*s == '.')
s++;
}
else
{
if (*s != '.')
return NULL;
s++;
s = parse_version_number (s, micro);
if (!s)
return NULL;
}
}
return s; /* patchlevel */
}
/* Helper for _gpgrt_cmp_version. */
static int
do_cmp_version (const char *a, const char *b, int level)
{
int a_major, a_minor, a_micro;
int b_major, b_minor, b_micro;
const char *a_plvl, *b_plvl;
int r;
int ignore_plvl;
int positive, negative;
if (level < 0)
{
positive = -1;
negative = 1;
level = 0 - level;
}
else
{
positive = 1;
negative = -1;
}
if ((ignore_plvl = (level > 9)))
level %= 10;
a_major = a_minor = a_micro = 0;
a_plvl = parse_version_string (a, &a_major,
level > 1? &a_minor : NULL,
level > 2? &a_micro : NULL);
if (!a_plvl)
a_major = a_minor = a_micro = 0; /* Error. */
b_major = b_minor = b_micro = 0;
b_plvl = parse_version_string (b, &b_major,
level > 1? &b_minor : NULL,
level > 2? &b_micro : NULL);
if (!b_plvl)
b_major = b_minor = b_micro = 0;
if (!ignore_plvl)
{
if (!a_plvl && !b_plvl)
return negative; /* Put invalid strings at the end. */
if (a_plvl && !b_plvl)
return positive;
if (!a_plvl && b_plvl)
return negative;
}
if (a_major > b_major)
return positive;
if (a_major < b_major)
return negative;
if (a_minor > b_minor)
return positive;
if (a_minor < b_minor)
return negative;
if (a_micro > b_micro)
return positive;
if (a_micro < b_micro)
return negative;
if (ignore_plvl)
return 0;
for (; *a_plvl && *b_plvl; a_plvl++, b_plvl++)
{
if (*a_plvl == '.' && *b_plvl == '.')
{
r = strcmp (a_plvl, b_plvl);
if (!r)
return 0;
else if ( r > 0 )
return positive;
else
return negative;
}
else if (*a_plvl == '.')
return negative; /* B is larger. */
else if (*b_plvl == '.')
return positive; /* A is larger. */
else if (*a_plvl != *b_plvl)
break;
}
if (*a_plvl == *b_plvl)
return 0;
else if ((*(signed char *)a_plvl - *(signed char *)b_plvl) > 0)
return positive;
else
return negative;
}
/* Compare function for version strings. The return value is
* like strcmp(). LEVEL may be
* 0 - reserved
* 1 - format is "<major><patchlevel>".
* 2 - format is "<major>.<minor><patchlevel>".
* 3 - format is "<major>.<minor>.<micro><patchlevel>".
* To ignore the patchlevel in the comparison add 10 to LEVEL. To get
* a reverse sorting order use a negative number.
*/
int
_gpgrt_cmp_version (const char *a, const char *b, int level)
{
return do_cmp_version (a, b, level);
}
/*
* 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)
{
const char *my_version = PACKAGE_VERSION;
if (req_version && req_version[0] == 1 && req_version[1] == 1)
return cright_blurb ();
if (!req_version)
return my_version;
return _gpgrt_cmp_version
(my_version, req_version, 12) >= 0 ? my_version : NULL;
}
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