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/*
* Most contents of this file are taken from:
* libdpkg - Debian packaging suite library routines
* from the files
* parsehelp.c - helpful routines for parsing and writing
* and
* vercmp.c - comparison of version numbers
*
* Copyright (C) 1995 Ian Jackson <ian@chiark.greenend.org.uk>
*
* 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,
* 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 dpkg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1301 USA
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "error.h"
#include "dpkgversions.h"
#define _(a) a
#define cisalpha(a) (isalpha(a)!=0)
#define cisdigit(a) (isdigit(a)!=0)
/* from dpkg-db.h.in: */
struct versionrevision {
unsigned long epoch;
const char *version;
const char *revision;
};
/* from parsehelp.c */
static
const char *parseversion(struct versionrevision *rversion, const char *string) {
char *hyphen, *colon, *eepochcolon;
const char *end, *ptr;
unsigned long epoch;
if (!*string) return _("version string is empty");
/* trim leading and trailing space */
while (*string && (*string == ' ' || *string == '\t')) string++;
/* string now points to the first non-whitespace char */
end = string;
/* find either the end of the string, or a whitespace char */
while (*end && *end != ' ' && *end != '\t') end++;
/* check for extra chars after trailing space */
ptr = end;
while (*ptr && (*ptr == ' ' || *ptr == '\t')) ptr++;
if (*ptr) return _("version string has embedded spaces");
colon= strchr(string, ':');
if (colon) {
epoch= strtoul(string, &eepochcolon, 10);
if (colon != eepochcolon) return _("epoch in version is not number");
if (!*++colon) return _("nothing after colon in version number");
string= colon;
rversion->epoch= epoch;
} else {
rversion->epoch= 0;
}
rversion->version= strndup(string, end - string);
hyphen= strrchr(rversion->version,'-');
if (hyphen) *hyphen++= 0;
rversion->revision= hyphen ? hyphen : "";
return NULL;
}
/* from vercmp.c */
/* assume ascii; warning: evaluates x multiple times! */
#define order(x) ((x) == '~' ? -1 \
: cisdigit((x)) ? 0 \
: !(x) ? 0 \
: cisalpha((x)) ? (x) \
: (x) + 256)
static int verrevcmp(const char *val, const char *ref) {
if (!val) val= "";
if (!ref) ref= "";
while (*val || *ref) {
int first_diff= 0;
while ((*val && !cisdigit(*val)) || (*ref && !cisdigit(*ref))) {
int vc= order(*val), rc= order(*ref);
if (vc != rc) return vc - rc;
val++; ref++;
}
while (*val == '0') val++;
while (*ref == '0') ref++;
while (cisdigit(*val) && cisdigit(*ref)) {
if (!first_diff) first_diff= *val - *ref;
val++; ref++;
}
if (cisdigit(*val)) return 1;
if (cisdigit(*ref)) return -1;
if (first_diff) return first_diff;
}
return 0;
}
static
int versioncompare(const struct versionrevision *version,
const struct versionrevision *refversion) {
int r;
if (version->epoch > refversion->epoch) return 1;
if (version->epoch < refversion->epoch) return -1;
r= verrevcmp(version->version,refversion->version); if (r) return r;
return verrevcmp(version->revision,refversion->revision);
}
/* now own code */
retvalue dpkgversions_cmp(const char *first,const char *second,int *result) {
struct versionrevision v1,v2;
const char *m;
if ((m = parseversion(&v1,first)) != NULL) {
fprintf(stderr,"Error while parsing '%s' as version: %s\n",first,m);
return RET_ERROR;
}
if ((m = parseversion(&v2,second)) != NULL) {
fprintf(stderr,"Error while parsing '%s' as version: %s\n",second,m);
return RET_ERROR;
}
*result = versioncompare(&v1,&v2);
free((char*)v1.version);
free((char*)v2.version);
return RET_OK;
}
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