/*
 * substr() - Extract and return a new substring of length at
 * most 'len' at offset 'begin' from 'str'.
 *
 * Dan Cross <net!gajendra!cross>
 */

#include <stddef.h>
#include <string.h>

char *
substr(const char *str, size_t begin, size_t len)
{

	if (strlen(str) < begin) {
		return(NULL);
	}
	return(strndup(str + begin, len));
}