#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int EOF;
int getchar();
int /*<<< orphan*/ putchar(int);
int main() {
  int input, prev;
  while ((input = getchar()) != EOF) {
    prev = 0;
    if (input == '\t') {
      putchar('\\');
      putchar('t');
      prev = 1;
    }
    if (input == '\b') {
      putchar('\\');
      putchar('b');
      prev = 1;
    }
    if (input == '\\') {
      putchar('\\');
      putchar('\\');
      prev = 1;
    }
    if (prev != 1)
      putchar(input);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
mov    $0x0,%al
call   1040 <getchar@plt>
mov    %eax,-0x8(%rbp)
mov    0x2ea8(%rip),%rcx
cmp    (%rcx),%eax
je     11d5 <main+0xb5>
movl   $0x0,-0xc(%rbp)
cmpl   $0x9,-0x8(%rbp)
jne    1174 <main+0x54>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    $0x74,%edi
call   1030 <putchar@plt>
movl   $0x1,-0xc(%rbp)
cmpl   $0x8,-0x8(%rbp)
jne    1199 <main+0x79>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    $0x62,%edi
call   1030 <putchar@plt>
movl   $0x1,-0xc(%rbp)
cmpl   $0x5c,-0x8(%rbp)
jne    11be <main+0x9e>
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    $0x5c,%edi
call   1030 <putchar@plt>
movl   $0x1,-0xc(%rbp)
cmpl   $0x1,-0xc(%rbp)
je     11d0 <main+0xb0>
mov    -0x8(%rbp),%edi
call   1030 <putchar@plt>
jmp    112f <main+0xf>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
xor    %eax,%eax
call   1040 <getchar@plt>
mov    0x2eb6(%rip),%r14
cmp    (%r14),%eax
jne    1141 <main+0x21>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
mov    %eax,%ebx
jmp    1174 <main+0x54>
cs nopw 0x0(%rax,%rax,1)
nop
mov    $0x74,%ebx
mov    $0x5c,%edi
call   1030 <putchar@plt>
mov    %ebx,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
call   1040 <getchar@plt>
mov    %eax,%ebx
cmp    (%r14),%eax
je     1137 <main+0x17>
cmp    $0x5c,%ebx
je     1190 <main+0x70>
cmp    $0x9,%ebx
je     1150 <main+0x30>
cmp    $0x8,%ebx
jne    115f <main+0x3f>
mov    $0x62,%ebx
jmp    1155 <main+0x35>
nopw   0x0(%rax,%rax,1)
mov    $0x5c,%ebx
jmp    1155 <main+0x35>

LLVM IR (-O0):
@EOF = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
br label %4
4: ; preds = %32, %0
%5 = call i32 (...) @getchar()
store i32 %5, i32* %2
%6 = load i32, i32* @EOF
%7 = icmp ne i32 %5, %6
br i1 %7, label %8, label %33
8: ; preds = %4
store i32 0, i32* %3
%9 = load i32, i32* %2
%10 = icmp eq i32 %9, 9
br i1 %10, label %11, label %14
11: ; preds = %8
%12 = call i32 @putchar(i32 92)
%13 = call i32 @putchar(i32 116)
store i32 1, i32* %3
br label %14
14: ; preds = %11, %8
%15 = load i32, i32* %2
%16 = icmp eq i32 %15, 8
br i1 %16, label %17, label %20
17: ; preds = %14
%18 = call i32 @putchar(i32 92)
%19 = call i32 @putchar(i32 98)
store i32 1, i32* %3
br label %20
20: ; preds = %17, %14
%21 = load i32, i32* %2
%22 = icmp eq i32 %21, 92
br i1 %22, label %23, label %26
23: ; preds = %20
%24 = call i32 @putchar(i32 92)
%25 = call i32 @putchar(i32 92)
store i32 1, i32* %3
br label %26
26: ; preds = %23, %20
%27 = load i32, i32* %3
%28 = icmp ne i32 %27, 1
br i1 %28, label %29, label %32
29: ; preds = %26
%30 = load i32, i32* %2
%31 = call i32 @putchar(i32 %30)
br label %32
32: ; preds = %29, %26
br label %4
33: ; preds = %4
ret i32 0
}

LLVM IR (-O2):
@EOF = global i32 0
define i32 @main() {
%1 = tail call i32 (...) @getchar()
%2 = load i32, i32* @EOF
%3 = icmp eq i32 %1, %2
br i1 %3, label %17, label %4
4: ; preds = %0, %11
%5 = phi i32 [ %14, %11 ], [ %1, %0 ]
switch i32 %5, label %11 [
i32 9, label %8
i32 8, label %6
i32 92, label %7
]
6: ; preds = %4
br label %8
7: ; preds = %4
br label %8
8: ; preds = %4, %7, %6
%9 = phi i32 [ 92, %7 ], [ 98, %6 ], [ 116, %4 ]
%10 = tail call i32 @putchar(i32 92)
br label %11
11: ; preds = %8, %4
%12 = phi i32 [ %5, %4 ], [ %9, %8 ]
%13 = tail call i32 @putchar(i32 %12)
%14 = tail call i32 (...) @getchar()
%15 = load i32, i32* @EOF
%16 = icmp eq i32 %14, %15
br i1 %16, label %17, label %4
17: ; preds = %11, %0
ret i32 0
}