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