/* strncpy function */
#include <string.h>
char *(strncpy)(char *s1, const char *s2, size_t n)
{ /* copy char s2[max n] to s1[n] */
char *s;
for (s = s1; 0 < n && *s2 != '\0'; --n)
*s++ = *s2++; /* copy at most n chars from s2[] */
for (; 0 < n; --n)
*s++ = '\0';
return (sl);
}