ref: f4f19cdf1a8f0d2aa5f9fce10c896201528b5347
dir: /sys/src/libc/port/memchr.c/
#include <u.h>
#include <libc.h>
void*
memchr(void *ap, int c, ulong n)
{
uchar *sp;
sp = ap;
c &= 0xFF;
while(n > 0) {
if(*sp++ == c)
return sp-1;
n--;
}
return 0;
}