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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
int
strverscmp(const char *s1, const char *s2);
int
strverscmp(const char *s1, const char *s2)
{
static const char *digits = "0123456789";
int ret;
long n1, n2;
size_t p1, p2;
do {
p1 = strcspn(s1, digits);
p2 = strcspn(s2, digits);
/* Different prefix */
if ((ret = strncmp(s1, s2, p1)) != 0)
return ret;
s1 += p1;
s2 += p2;
n1 = strtol(s1, NULL, 10);
n2 = strtol(s2, NULL, 10);
if (n1 < n2)
return -1;
else if (n1 > n2)
return 1;
/* Numbers are equal or not present, try with next ones. */
p1 = strspn(s1, digits);
p2 = strspn(s2, digits);
s1 += p1;
s2 += p2;
} while (p1 == p2 && p1 != 0 && p1 != 0);
return strcmp(s1, s2);
}
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