grantseltzer

package main

import (
	"debug/elf"
	"fmt"
	"log"
	"os"
)

func main() {

grantseltzer

// This defeats the purpose of io.Writer
func WriteAsciiArtToFile(path string) error { 
    f, err := os.Open(path)
    if err != nil {
        return err
    }
    artBytes := makeSomeArt()
    _, err = f.Write(artBytes)
    return err
}

grantseltzer

grantseltzer

grantseltzer

grantseltzer

//go:cgo_import_dynamic libc_res_search res_search "/usr/lib/libSystem.B.dylib"

grantseltzer

//go:nosplit
//go:cgo_unsafe_args
func res_search(dname *byte, class int32, rtype int32, answer *byte, anslen int32) (int32, int32) {
	args := struct {
		dname                   *byte
		class, rtype            int32
		answer                  *byte
		anslen, retSize, retErr int32
	}{dname, class, rtype, answer, anslen, 0, 0}
	libcCall(unsafe.Pointer(funcPC(res_search_trampoline)), unsafe.Pointer(&args))

grantseltzer

TEXT runtime·res_search_trampoline(SB),NOSPLIT,$0
    PUSHQ    BP
    MOVQ     SP, BP
    MOVQ     DI, BX   // move DI into BX to preserve struct addr
    MOVL     24(BX), R8  // arg 5 anslen
    MOVQ     16(BX), CX  // arg 4 answer
    MOVL     12(BX), DX  // arg 3 type
    MOVL     8(BX), SI   // arg 2 class
    MOVQ     0(BX), DI   // arg 1 name
    CALL     libc_res_search(SB)

grantseltzer

package switchers

func SwitchFunction(a, b int, c *int) string {
    switch *c {
    case a:
       return "a"
    case b:
       return "b"
    default:
       return "c"

grantseltzer

package switchers

import "testing"

func TestSwitch(t *testing.T) {

    var (
      a int 
      b int
      c = &b