ref: f5cf5b0df22e52c5c053467c751da56d8f801f2b
dir: /sys/src/ape/lib/ap/gen/strdup.c/
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
char*
strdup(char *p)
{
	int n;
	char *np;
	n = strlen(p)+1;
	np = malloc(n);
	if(np)
		memmove(np, p, n);
	return np;
}