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/* this function was taken from rpm 4.0.4 and rewritten */
int _alpm_versioncmp(const char *a, const char *b)
{
	char str1[64], str2[64];
	char *ptr1, *ptr2;
	char *one, *two;
	char *rel1 = NULL, *rel2 = NULL;
	char oldch1, oldch2;
	int is1num, is2num;
	int rc;

	ALPM_LOG_FUNC;

	if(!strcmp(a,b)) {
		return(0);
	}

	strncpy(str1, a, 64);
	str1[63] = 0;
	strncpy(str2, b, 64);
	str2[63] = 0;

	/* lose the release number */
	for(one = str1; *one && *one != '-'; one++);
	if(one) {
		*one = '\0';
		rel1 = ++one;
	}
	for(two = str2; *two && *two != '-'; two++);
	if(two) {
		*two = '\0';
		rel2 = ++two;
	}

	one = str1;
	two = str2;

	while(*one || *two) {
		while(*one && !isalnum((int)*one)) one++;
		while(*two && !isalnum((int)*two)) two++;

		ptr1 = one;
		ptr2 = two;

		/* find the next segment for each string */
		if(isdigit((int)*ptr1)) {
			is1num = 1;
			while(*ptr1 && isdigit((int)*ptr1)) ptr1++;
		} else {
			is1num = 0;
			while(*ptr1 && isalpha((int)*ptr1)) ptr1++;
		}
		if(isdigit((int)*ptr2)) {
			is2num = 1;
			while(*ptr2 && isdigit((int)*ptr2)) ptr2++;
		} else {
			is2num = 0;
			while(*ptr2 && isalpha((int)*ptr2)) ptr2++;
		}

		oldch1 = *ptr1;
		*ptr1 = '\0';
		oldch2 = *ptr2;
		*ptr2 = '\0';

		/* see if we ran out of segments on one string */
		if(one == ptr1 && two != ptr2) {
			return(is2num ? -1 : 1);
		}
		if(one != ptr1 && two == ptr2) {
			return(is1num ? 1 : -1);
		}

		/* see if we have a type mismatch (ie, one is alpha and one is digits) */
		if(is1num && !is2num) return(1);
		if(!is1num && is2num) return(-1);

		if(is1num) while(*one == '0') one++;
		if(is2num) while(*two == '0') two++;

		rc = strverscmp(one, two);
		if(rc) return(rc);

		*ptr1 = oldch1;
		*ptr2 = oldch2;
		one = ptr1;
		two = ptr2;
	}

	if((!*one) && (!*two)) {
		/* compare release numbers */
		if(rel1 && rel2 && strlen(rel1) && strlen(rel2)) return(_alpm_versioncmp(rel1, rel2));
		return(0);
	}

	return(*one ? 1 : -1);
}