ref: 3f7a323e31ddc5989de00d86e3dab6cd6929c00c
dir: /sys/src/ape/lib/ap/gen/memccpy.c/
#include <string.h> void* memccpy(void *a1, void *a2, int c, size_t n) { unsigned char *s1, *s2; s1 = a1; s2 = a2; c &= 0xFF; while(n > 0) { if((*s1++ = *s2++) == c) return s1; n--; } return 0; }