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/*
* libdpkg - Debian packaging suite library routines
* version.c - version handling functions
*
* Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
* Copyright © 2008-2014 Guillem Jover <guillem@debian.org>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of 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.
*
* This 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 copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <dpkg/c-ctype.h>
#include <dpkg/ehandle.h>
#include <dpkg/string.h>
#include <dpkg/version.h>
/**
* Turn the passed version into an empty version.
*
* This can be used to ensure the version is properly initialized.
*
* @param version The version to clear.
*/
void
dpkg_version_blank(struct dpkg_version *version)
{
version->epoch = 0;
version->version = NULL;
version->revision = NULL;
}
/**
* Test if a version is not empty.
*
* @param version The version to test.
*
* @retval true If the version is informative (i.e. not an empty version).
* @retval false If the version is empty.
*/
bool
dpkg_version_is_informative(const struct dpkg_version *version)
{
return (version->epoch ||
str_is_set(version->version) ||
str_is_set(version->revision));
}
/**
* Give a weight to the character to order in the version comparison.
*
* @param c An ASCII character.
*/
static int
order(int c)
{
if (c_isdigit(c))
return 0;
else if (c_isalpha(c))
return c;
else if (c == '~')
return -1;
else if (c)
return c + 256;
else
return 0;
}
static int
verrevcmp(const char *a, const char *b)
{
if (a == NULL)
a = "";
if (b == NULL)
b = "";
while (*a || *b) {
int first_diff = 0;
while ((*a && !c_isdigit(*a)) || (*b && !c_isdigit(*b))) {
int ac = order(*a);
int bc = order(*b);
if (ac != bc)
return ac - bc;
a++;
b++;
}
while (*a == '0')
a++;
while (*b == '0')
b++;
while (c_isdigit(*a) && c_isdigit(*b)) {
if (!first_diff)
first_diff = *a - *b;
a++;
b++;
}
if (c_isdigit(*a))
return 1;
if (c_isdigit(*b))
return -1;
if (first_diff)
return first_diff;
}
return 0;
}
/**
* Compares two Debian versions.
*
* This function follows the convention of the comparator functions used by
* qsort().
*
* @see deb-version(5)
*
* @param a The first version.
* @param b The second version.
*
* @retval 0 If a and b are equal.
* @retval <0 If a is smaller than b.
* @retval >0 If a is greater than b.
*/
int
dpkg_version_compare(const struct dpkg_version *a,
const struct dpkg_version *b)
{
int rc;
if (a->epoch > b->epoch)
return 1;
if (a->epoch < b->epoch)
return -1;
rc = verrevcmp(a->version, b->version);
if (rc)
return rc;
return verrevcmp(a->revision, b->revision);
}
/**
* Check if two versions have a certain relation.
*
* @param a The first version.
* @param rel The relation.
* @param b The second version.
*
* @retval true If rel is #DPKG_RELATION_NONE or the expression “a rel b” is
* true.
* @retval false Otherwise.
*
* @warning If rel is not a valid relation, this function will terminate
* the program.
*/
bool
dpkg_version_relate(const struct dpkg_version *a,
enum dpkg_relation rel,
const struct dpkg_version *b)
{
int rc;
if (rel == DPKG_RELATION_NONE)
return true;
rc = dpkg_version_compare(a, b);
switch (rel) {
case DPKG_RELATION_EQ:
return rc == 0;
case DPKG_RELATION_LT:
return rc < 0;
case DPKG_RELATION_LE:
return rc <= 0;
case DPKG_RELATION_GT:
return rc > 0;
case DPKG_RELATION_GE:
return rc >= 0;
default:
internerr("unknown dpkg_relation %d", rel);
}
return false;
}
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