277 lines
7.3 KiB
C
277 lines
7.3 KiB
C
/*
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* Copyright (c) 2006-2016 Pacman Development Team <pacman-dev@archlinux.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <ctype.h>
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/* libalpm */
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#include "util.h"
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/**
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* Some functions in this file have been adopted from the rpm source, notably
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* 'rpmvercmp' located at lib/rpmvercmp.c and 'parseEVR' located at
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* lib/rpmds.c. It was most recently updated against rpm version 4.8.1. Small
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* modifications have been made to make it more consistent with the libalpm
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* coding style.
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*/
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/**
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* Split EVR into epoch, version, and release components.
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* @param evr [epoch:]version[-release] string
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* @retval *ep pointer to epoch
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* @retval *vp pointer to version
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* @retval *rp pointer to release
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*/
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static void parseEVR(char *evr, const char **ep, const char **vp,
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const char **rp)
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{
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const char *epoch;
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const char *version;
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const char *release;
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char *s, *se;
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s = evr;
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/* s points to epoch terminator */
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while (*s && isdigit(*s)) s++;
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/* se points to version terminator */
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se = strrchr(s, '-');
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if(*s == ':') {
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epoch = evr;
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*s++ = '\0';
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version = s;
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if(*epoch == '\0') {
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epoch = "0";
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}
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} else {
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/* different from RPM- always assume 0 epoch */
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epoch = "0";
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version = evr;
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}
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if(se) {
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*se++ = '\0';
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release = se;
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} else {
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release = NULL;
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}
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if(ep) *ep = epoch;
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if(vp) *vp = version;
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if(rp) *rp = release;
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}
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/**
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* Compare alpha and numeric segments of two versions.
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* return 1: a is newer than b
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* 0: a and b are the same version
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* -1: b is newer than a
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*/
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static int rpmvercmp(const char *a, const char *b)
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{
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char oldch1, oldch2;
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char *str1, *str2;
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char *ptr1, *ptr2;
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char *one, *two;
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int rc;
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int isnum;
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int ret = 0;
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/* easy comparison to see if versions are identical */
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if(strcmp(a, b) == 0) return 0;
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str1 = strdup(a);
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str2 = strdup(b);
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one = ptr1 = str1;
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two = ptr2 = str2;
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/* loop through each version segment of str1 and str2 and compare them */
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while (*one && *two) {
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while (*one && !isalnum((int)*one)) one++;
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while (*two && !isalnum((int)*two)) two++;
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/* If we ran to the end of either, we are finished with the loop */
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if (!(*one && *two)) break;
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/* If the separator lengths were different, we are also finished */
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if ((one - ptr1) != (two - ptr2)) {
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ret = (one - ptr1) < (two - ptr2) ? -1 : 1;
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goto cleanup;
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}
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ptr1 = one;
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ptr2 = two;
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/* grab first completely alpha or completely numeric segment */
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/* leave one and two pointing to the start of the alpha or numeric */
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/* segment and walk ptr1 and ptr2 to end of segment */
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if (isdigit((int)*ptr1)) {
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while (*ptr1 && isdigit((int)*ptr1)) ptr1++;
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while (*ptr2 && isdigit((int)*ptr2)) ptr2++;
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isnum = 1;
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} else {
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while (*ptr1 && isalpha((int)*ptr1)) ptr1++;
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while (*ptr2 && isalpha((int)*ptr2)) ptr2++;
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isnum = 0;
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}
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/* save character at the end of the alpha or numeric segment */
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/* so that they can be restored after the comparison */
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oldch1 = *ptr1;
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*ptr1 = '\0';
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oldch2 = *ptr2;
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*ptr2 = '\0';
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/* this cannot happen, as we previously tested to make sure that */
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/* the first string has a non-null segment */
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if (one == ptr1) {
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ret = -1; /* arbitrary */
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goto cleanup;
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}
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/* take care of the case where the two version segments are */
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/* different types: one numeric, the other alpha (i.e. empty) */
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/* numeric segments are always newer than alpha segments */
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/* XXX See patch #60884 (and details) from bugzilla #50977. */
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if (two == ptr2) {
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ret = isnum ? 1 : -1;
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goto cleanup;
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}
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if (isnum) {
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/* this used to be done by converting the digit segments */
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/* to ints using atoi() - it's changed because long */
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/* digit segments can overflow an int - this should fix that. */
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/* throw away any leading zeros - it's a number, right? */
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while (*one == '0') one++;
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while (*two == '0') two++;
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/* whichever number has more digits wins */
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if (strlen(one) > strlen(two)) {
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ret = 1;
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goto cleanup;
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}
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if (strlen(two) > strlen(one)) {
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ret = -1;
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goto cleanup;
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}
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}
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/* strcmp will return which one is greater - even if the two */
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/* segments are alpha or if they are numeric. don't return */
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/* if they are equal because there might be more segments to */
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/* compare */
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rc = strcmp(one, two);
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if (rc) {
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ret = rc < 1 ? -1 : 1;
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goto cleanup;
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}
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/* restore character that was replaced by null above */
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*ptr1 = oldch1;
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one = ptr1;
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*ptr2 = oldch2;
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two = ptr2;
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}
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/* this catches the case where all numeric and alpha segments have */
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/* compared identically but the segment separating characters were */
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/* different */
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if ((!*one) && (!*two)) {
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ret = 0;
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goto cleanup;
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}
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/* the final showdown. we never want a remaining alpha string to
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* beat an empty string. the logic is a bit weird, but:
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* - if one is empty and two is not an alpha, two is newer.
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* - if one is an alpha, two is newer.
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* - otherwise one is newer.
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* */
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if ( (!*one && !isalpha((int)*two))
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|| isalpha((int)*one) ) {
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ret = -1;
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} else {
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ret = 1;
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}
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cleanup:
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free(str1);
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free(str2);
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return ret;
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}
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/** Compare two version strings and determine which one is 'newer'.
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* Returns a value comparable to the way strcmp works. Returns 1
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* if a is newer than b, 0 if a and b are the same version, or -1
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* if b is newer than a.
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*
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* Different epoch values for version strings will override any further
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* comparison. If no epoch is provided, 0 is assumed.
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*
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* Keep in mind that the pkgrel is only compared if it is available
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* on both versions handed to this function. For example, comparing
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* 1.5-1 and 1.5 will yield 0; comparing 1.5-1 and 1.5-2 will yield
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* -1 as expected. This is mainly for supporting versioned dependencies
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* that do not include the pkgrel.
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*/
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int SYMEXPORT alpm_pkg_vercmp(const char *a, const char *b)
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{
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char *full1, *full2;
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const char *epoch1, *ver1, *rel1;
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const char *epoch2, *ver2, *rel2;
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int ret;
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/* ensure our strings are not null */
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if(!a && !b) {
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return 0;
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} else if(!a) {
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return -1;
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} else if(!b) {
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return 1;
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}
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/* another quick shortcut- if full version specs are equal */
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if(strcmp(a, b) == 0) {
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return 0;
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}
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/* Parse both versions into [epoch:]version[-release] triplets. We probably
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* don't need epoch and release to support all the same magic, but it is
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* easier to just run it all through the same code. */
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full1 = strdup(a);
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full2 = strdup(b);
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/* parseEVR modifies passed in version, so have to dupe it first */
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parseEVR(full1, &epoch1, &ver1, &rel1);
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parseEVR(full2, &epoch2, &ver2, &rel2);
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ret = rpmvercmp(epoch1, epoch2);
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if(ret == 0) {
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ret = rpmvercmp(ver1, ver2);
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if(ret == 0 && rel1 && rel2) {
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ret = rpmvercmp(rel1, rel2);
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}
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}
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free(full1);
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free(full2);
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return ret;
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}
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/* vim: set noet: */
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