ref: 16ba4693e5f2f12c01bfd2ff89d53504d24cbd75
dir: /sys/src/ape/lib/ap/gen/strndup.c/
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
char*
strndup(char *p, size_t max)
{
int n;
char *np;
n = strnlen(p, max);
np = malloc(n+1);
if(!np)
return NULL;
memcpy(np, p, n);
np[n] = 0;
return np;
}