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/* This file is part of Mailfromd.
Copyright (C) 2005-2024 Sergey Poznyakoff
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 3, 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, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "libmf.h"
#include <stdlib.h>
int
mf_vercmp(const char *a, const char *b, int *pres)
{
int res = 0;
if (!pres)
pres = &res;
if (!a || !*a) {
*pres = 0;
return -1;
}
if (!b || !*b) {
*pres = 1;
return -1;
}
while (1) {
char *p;
unsigned long an, bn;
if (!a) {
if (b) {
strtoul(b, &p, 10);
if (*p && *p != '.') {
*pres = 1;
return -1;
}
*pres = -1;
} else
*pres = 0;
break;
}
if (!b) {
if (a) {
strtoul(a, &p, 10);
if (*p && *p != '.') {
*pres = 0;
return -1;
}
*pres = 1;
} else
*pres = 0;
break;
}
an = strtoul(a, &p, 10);
if (*p) {
if (*p != '.') {
*pres = 0;
return -1;
}
a = p + 1;
} else
a = NULL;
bn = strtoul(b, &p, 10);
if (*p) {
if (*p != '.') {
*pres = 1;
return -1;
}
b = p + 1;
} else
b = NULL;
if (an < bn) {
*pres = -1;
break;
}
if (an > bn) {
*pres = 1;
break;
}
}
return *pres != 0;
}
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