ref: ccd7f9f1597e56d121e1d05cf6af86f688ef2c48
dir: /libkern/memccpy.c/
#include <lib9.h>
void*
memccpy(void *a1, void *a2, int c, ulong n)
{
uchar *s1, *s2;
s1 = a1;
s2 = a2;
c &= 0xFF;
while(n > 0) {
if((*s1++ = *s2++) == c)
return s1;
n--;
}
return 0;
}