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/*
* libdpkg - Debian packaging suite library routines
* vercmp.c - comparison of version numbers
*
* Copyright (C) 1995 Ian Jackson <iwj10@cus.cam.ac.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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
# define _(Text) Text
struct versionrevision {
unsigned long epoch;
char *version;
const char *revision;
};
/* assume ascii; warning: evaluates x multiple times! */
#define order(x) ((x) == '~' ? -1 \
: isdigit((x)) ? 0 \
: !(x) ? 0 \
: isalpha((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 && !isdigit(*val)) || (*ref && !isdigit(*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 (isdigit(*val) && isdigit(*ref)) {
if (!first_diff) first_diff= *val - *ref;
val++; ref++;
}
if (isdigit(*val)) return 1;
if (isdigit(*ref)) return -1;
if (first_diff) return first_diff;
}
return 0;
}
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;
r= verrevcmp(version->revision,refversion->revision); if (r) return r;
return r;
}
int versionsatisfied3(const struct versionrevision *it,
const struct versionrevision *ref,
const char *op)
{
int r;
r= versioncompare(it,ref);
if (strcmp(op, "<=") == 0 || strcmp(op, "<") == 0)
return r <= 0;
if (strcmp(op, ">=") == 0 || strcmp(op, ">") == 0)
return r >= 0;
if (strcmp(op, "<<") == 0)
return r < 0;
if (strcmp(op, ">>") == 0)
return r > 0;
if (strcmp(op, "=") == 0)
return r == 0;
fprintf(stderr, "unknown operator: %s", op);
exit(1);
}
const char *parseversion(struct versionrevision *rversion, const char *string)
{
char *hyphen, *colon, *eepochcolon;
unsigned long epoch;
if (!*string) return _("version string is empty");
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->revision = "";
rversion->version= malloc(strlen(string)+1);
strcpy(rversion->version, string);
#if 0
fprintf(stderr,"Parsed version: %lu, %s\n",
rversion->epoch,
rversion->version);
#endif
return 0;
}
int main(int argc, char *argv[])
{
const char *err;
struct versionrevision ver, ref;
if (argc < 4) {
fprintf(stderr, "usage: %s: version op refversion\n", argv[0]);
return 2;
}
err = parseversion(&ver, argv[1]);
if (err) {
fprintf(stderr, "Invalid version `%s': %s\n", argv[1], err);
return 2;
}
err = parseversion(&ref, argv[3]);
if (err) {
fprintf(stderr, "Invalid version `%s': %s\n", argv[3], err);
return 2;
}
return ! versionsatisfied3(&ver, &ref, argv[2]);
}
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