ref: 7d4a1e3643caa658ee40271edb0dc9a48fd50b58
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;
}