#include <string.h>
#include <ctype.h>

int strcasecmp(const char *_l, const char *_r)
{
	const unsigned char *l=(void *)_l, *r=(void *)_r;
	for (; *l && *r && (*l == *r || tolower(*l) == tolower(*r)); l++, r++);
	return tolower(*l) - tolower(*r);
}

int strncasecmp(const char *_l, const char *_r, size_t n)
{
	const unsigned char *l=(void *)_l, *r=(void *)_r;
	if (!n--) return 0;
	for (; *l && *r && n && (*l == *r || tolower(*l) == tolower(*r)); l++, r++, n--);
	return tolower(*l) - tolower(*r);
}

char *strcasestr(const char *h, const char *n)
{
	size_t l = strlen(n);
	for (; *h; h++) if (!strncasecmp(h, n, l)) return (char *)h;
	return 0;
}

char *strtok_r(char *s, const char *sep, char **p)
{
	if (!s && !(s = *p)) return NULL;
	s += strspn(s, sep);
	if (!*s) return *p = 0;
	*p = s + strcspn(s, sep);
	if (**p) *(*p)++ = 0;
	else *p = 0;
	return s;
}