#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 /*<<< orphan*/ STDIN_FILENO;
int /*<<< orphan*/ STDOUT_FILENO;
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ perror(char *);
int read(int /*<<< orphan*/, int *, int);
int write(int /*<<< orphan*/, int *, int);
int main(void) {
  int n;
  int buf[128];
  while ((n = read(STDIN_FILENO, buf, 128)) > 0) {
    if (write(STDOUT_FILENO, buf, n) != n) {
      perror("write error");
      exit(1);
    }
  }
  if (n < 0) {
    perror("write error");
    exit(1);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x210,%rsp
movl   $0x0,-0x4(%rbp)
mov    0x2e7f(%rip),%rax
mov    (%rax),%edi
lea    -0x210(%rbp),%rsi
mov    $0x80,%edx
call   1040 <read@plt>
mov    %eax,-0x8(%rbp)
cmp    $0x0,%eax
jle    11b4 <main+0x74>
mov    0x2e71(%rip),%rax
mov    (%rax),%edi
lea    -0x210(%rbp),%rsi
mov    -0x8(%rbp),%edx
call   1030 <write@plt>
cmp    -0x8(%rbp),%eax
je     11af <main+0x6f>
lea    0xe60(%rip),%rdi
call   1050 <perror@plt>
mov    $0x1,%edi
call   1060 <exit@plt>
jmp    1152 <main+0x12>
cmpl   $0x0,-0x8(%rbp)
jge    11d4 <main+0x94>
lea    0xe3b(%rip),%rdi
call   1050 <perror@plt>
mov    $0x1,%edi
call   1060 <exit@plt>
xor    %eax,%eax
add    $0x210,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
sub    $0x208,%rsp
mov    0x2e84(%rip),%r14
mov    %rsp,%rbx
mov    0x2e92(%rip),%r15
xchg   %ax,%ax
mov    (%r14),%edi
mov    %rbx,%rsi
mov    $0x80,%edx
call   1040 <read@plt>
test   %eax,%eax
jle    119d <main+0x5d>
mov    %eax,%ebp
mov    (%r15),%edi
mov    %rbx,%rsi
mov    %eax,%edx
call   1030 <write@plt>
cmp    %ebp,%eax
je     1160 <main+0x20>
lea    0xe72(%rip),%rdi
call   1050 <perror@plt>
mov    $0x1,%edi
call   1060 <exit@plt>
js     1187 <main+0x47>
xor    %eax,%eax
add    $0x208,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@STDIN_FILENO = global i32 0
@STDOUT_FILENO = global i32 0
@.str = [12 x i8] c"write error\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca [128 x i32]
store i32 0, i32* %1
br label %4
4: ; preds = %19, %0
%5 = load i32, i32* @STDIN_FILENO
%6 = getelementptr inbounds [128 x i32], [128 x i32]* %3, i64 0, i64 0
%7 = call i32 @read(i32 %5, i32* %6, i32 128)
store i32 %7, i32* %2
%8 = icmp sgt i32 %7, 0
br i1 %8, label %9, label %20
9: ; preds = %4
%10 = load i32, i32* @STDOUT_FILENO
%11 = getelementptr inbounds [128 x i32], [128 x i32]* %3, i64 0, i64 0
%12 = load i32, i32* %2
%13 = call i32 @write(i32 %10, i32* %11, i32 %12)
%14 = load i32, i32* %2
%15 = icmp ne i32 %13, %14
br i1 %15, label %16, label %19
16: ; preds = %9
%17 = call i32 @perror(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0))
%18 = call i32 @exit(i32 1)
unreachable
19: ; preds = %9
br label %4
20: ; preds = %4
%21 = load i32, i32* %2
%22 = icmp slt i32 %21, 0
br i1 %22, label %23, label %26
23: ; preds = %20
%24 = call i32 @perror(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0))
%25 = call i32 @exit(i32 1)
unreachable
26: ; preds = %20
ret i32 0
}

LLVM IR (-O2):
@STDIN_FILENO = global i32 0
@STDOUT_FILENO = global i32 0
@.str = [12 x i8] c"write error\00"
define i32 @main() {
%1 = alloca [128 x i32]
%2 = bitcast [128 x i32]* %1 to i8*
%3 = getelementptr inbounds [128 x i32], [128 x i32]* %1, i64 0, i64 0
br label %4
4: ; preds = %8, %0
%5 = load i32, i32* @STDIN_FILENO
%6 = call i32 @read(i32 %5, i32* %3, i32 128)
%7 = icmp sgt i32 %6, 0
br i1 %7, label %8, label %15
8: ; preds = %4
%9 = load i32, i32* @STDOUT_FILENO
%10 = call i32 @write(i32 %9, i32* %3, i32 %6)
%11 = icmp eq i32 %10, %6
br i1 %11, label %4, label %12
12: ; preds = %8
%13 = tail call i32 @perror(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0))
%14 = tail call i32 @exit(i32 1)
unreachable
15: ; preds = %4
%16 = icmp slt i32 %6, 0
br i1 %16, label %17, label %20
17: ; preds = %15
%18 = tail call i32 @perror(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0))
%19 = tail call i32 @exit(i32 1)
unreachable
20: ; preds = %15
ret i32 0
}