mirror of
https://github.com/moparisthebest/pacman
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266 lines
6.5 KiB
C
266 lines
6.5 KiB
C
/*
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* versioncmp.c
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*
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* Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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/* pacman */
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#include "versioncmp.h"
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#ifndef HAVE_STRVERSCMP
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/* GNU's strverscmp() function, taken from glibc 2.3.2 sources
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*/
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/* Compare strings while treating digits characters numerically.
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Copyright (C) 1997, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jean-François Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* states: S_N: normal, S_I: comparing integral part, S_F: comparing
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fractionnal parts, S_Z: idem but with leading Zeroes only */
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#define S_N 0x0
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#define S_I 0x4
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#define S_F 0x8
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#define S_Z 0xC
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/* result_type: CMP: return diff; LEN: compare using len_diff/diff */
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#define CMP 2
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#define LEN 3
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/* Compare S1 and S2 as strings holding indices/version numbers,
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returning less than, equal to or greater than zero if S1 is less than,
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equal to or greater than S2 (for more info, see the texinfo doc).
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*/
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static int strverscmp (s1, s2)
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const char *s1;
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const char *s2;
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{
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const unsigned char *p1 = (const unsigned char *) s1;
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const unsigned char *p2 = (const unsigned char *) s2;
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unsigned char c1, c2;
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int state;
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int diff;
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/* Symbol(s) 0 [1-9] others (padding)
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Transition (10) 0 (01) d (00) x (11) - */
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static const unsigned int next_state[] =
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{
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/* state x d 0 - */
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/* S_N */ S_N, S_I, S_Z, S_N,
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/* S_I */ S_N, S_I, S_I, S_I,
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/* S_F */ S_N, S_F, S_F, S_F,
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/* S_Z */ S_N, S_F, S_Z, S_Z
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};
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static const int result_type[] =
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{
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/* state x/x x/d x/0 x/- d/x d/d d/0 d/-
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0/x 0/d 0/0 0/- -/x -/d -/0 -/- */
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/* S_N */ CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
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CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
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/* S_I */ CMP, -1, -1, CMP, +1, LEN, LEN, CMP,
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+1, LEN, LEN, CMP, CMP, CMP, CMP, CMP,
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/* S_F */ CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
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CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
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/* S_Z */ CMP, +1, +1, CMP, -1, CMP, CMP, CMP,
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-1, CMP, CMP, CMP
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};
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if (p1 == p2)
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return 0;
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c1 = *p1++;
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c2 = *p2++;
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/* Hint: '0' is a digit too. */
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state = S_N | ((c1 == '0') + (isdigit (c1) != 0));
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while ((diff = c1 - c2) == 0 && c1 != '\0')
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{
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state = next_state[state];
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c1 = *p1++;
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c2 = *p2++;
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state |= (c1 == '0') + (isdigit (c1) != 0);
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}
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state = result_type[state << 2 | (((c2 == '0') + (isdigit (c2) != 0)))];
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switch (state)
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{
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case CMP:
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return diff;
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case LEN:
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while (isdigit (*p1++))
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if (!isdigit (*p2++))
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return 1;
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return isdigit (*p2) ? -1 : diff;
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default:
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return state;
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}
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}
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#endif
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/* this function was taken from rpm 4.0.4 and rewritten */
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int versioncmp(const char *a, const char *b) {
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char *str1, *ostr1, *str2, *ostr2;
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char *one, *two;
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char *rel1 = NULL, *rel2 = NULL;
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char oldch1, oldch2;
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int is1num, is2num;
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int rc, rv;
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if (!strcmp(a,b)) {
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return(0);
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}
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str1 = strdup(a);
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ostr1 = str1;
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str2 = strdup(b);
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ostr2 = str2;
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/* lose the release number */
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for(one = str1; *one && *one != '-'; one++);
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if(*one) {
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*one = '\0';
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rel1 = ++one;
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if (*rel1 == '\0')
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rel1 = NULL;
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}
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for(two = str2; *two && *two != '-'; two++);
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if(*two) {
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*two = '\0';
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rel2 = ++two;
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if (*rel2 == '\0')
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rel2 = NULL;
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}
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one = str1;
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two = str2;
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while(*one || *two) {
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while(*one && !isalnum(*one)) one++;
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while(*two && !isalnum(*two)) two++;
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str1 = one;
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str2 = two;
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/* find the next segment for each string */
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if(isdigit(*str1)) {
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is1num = 1;
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while(*str1 && isdigit(*str1)) str1++;
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} else {
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is1num = 0;
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while(*str1 && isalpha(*str1)) str1++;
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}
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if(isdigit(*str2)) {
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is2num = 1;
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while(*str2 && isdigit(*str2)) str2++;
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} else {
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is2num = 0;
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while(*str2 && isalpha(*str2)) str2++;
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}
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oldch1 = *str1;
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*str1 = '\0';
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oldch2 = *str2;
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*str2 = '\0';
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/* see if we ran out of segments on one string */
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if(one == str1 && two != str2) {
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free(ostr1);
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free(ostr2);
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return(is2num ? -1 : 1);
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}
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if(one != str1 && two == str2) {
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free(ostr1);
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free(ostr2);
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return(is1num ? 1 : -1);
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}
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/* see if we have a type mismatch (ie, one is alpha and one is digits) */
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if(is1num && !is2num) {
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free(ostr1);
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free(ostr2);
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return(1);
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}
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if(!is1num && is2num) {
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free(ostr1);
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free(ostr2);
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return(-1);
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}
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if(is1num) while(*one == '0') one++;
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if(is2num) while(*two == '0') two++;
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rc = strverscmp(one, two);
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if(rc) {
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free(ostr1);
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free(ostr2);
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return(rc);
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}
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*str1 = oldch1;
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*str2 = oldch2;
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one = str1;
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two = str2;
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}
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if((!*one) && (!*two)) {
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/* compare release numbers */
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if(rel1 && rel2) {
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rv = versioncmp(rel1, rel2);
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free(ostr1);
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free(ostr2);
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return rv;
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} else {
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free(ostr1);
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free(ostr2);
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return(0);
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}
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}
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return(*one ? 1 : -1);
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}
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/* vim: set ts=2 sw=2 noet: */
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