#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 */
struct winsize {
  int ws_col;
  int ws_row;
};

/* Variables and functions */
int /*<<< orphan*/ STDIN_FILENO;
int /*<<< orphan*/ TIOCGWINSZ;
int ioctl(int /*<<< orphan*/, int /*<<< orphan*/, struct winsize *);
int get_window_size(int *rows, int *columns) {
  struct winsize window_size;
  if (ioctl(STDIN_FILENO, TIOCGWINSZ, &window_size) == -1 ||
      window_size.ws_col == 0) {
    return -1;
  }
  *columns = window_size.ws_col;
  *rows = window_size.ws_row;
  return 0;
}


x86 assembly (clang, -O0):
<get_window_size>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    0x2eb9(%rip),%rax
mov    (%rax),%edi
mov    0x2ea0(%rip),%rax
mov    (%rax),%esi
lea    -0x20(%rbp),%rdx
call   1030 <ioctl@plt>
cmp    $0xffffffff,%eax
je     114e <get_window_size+0x3e>
cmpl   $0x0,-0x20(%rbp)
jne    115a <get_window_size+0x4a>
movl   $0xffffffff,-0x4(%rbp)
jmp    1173 <get_window_size+0x63>
mov    -0x20(%rbp),%ecx
mov    -0x18(%rbp),%rax
mov    %ecx,(%rax)
mov    -0x1c(%rbp),%ecx
mov    -0x10(%rbp),%rax
mov    %ecx,(%rax)
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_window_size>:
push   %r14
push   %rbx
push   %rax
mov    %rsi,%rbx
mov    %rdi,%r14
mov    0x2ebf(%rip),%rax
mov    (%rax),%edi
mov    0x2ea6(%rip),%rax
mov    (%rax),%esi
mov    %rsp,%rdx
call   1030 <ioctl@plt>
mov    %eax,%ecx
mov    $0xffffffff,%eax
cmp    $0xffffffff,%ecx
je     1152 <get_window_size+0x42>
mov    (%rsp),%ecx
test   %ecx,%ecx
je     1152 <get_window_size+0x42>
mov    %ecx,(%rbx)
mov    0x4(%rsp),%eax
mov    %eax,(%r14)
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
%struct.winsize = type { i32, i32 }
@STDIN_FILENO = global i32 0
@TIOCGWINSZ = global i32 0
define i32 @get_window_size(i32* %0, i32* %1) {
%3 = alloca i32
%4 = alloca i32*
%5 = alloca i32*
%6 = alloca %struct.winsize
store i32* %0, i32** %4
store i32* %1, i32** %5
%7 = load i32, i32* @STDIN_FILENO
%8 = load i32, i32* @TIOCGWINSZ
%9 = call i32 @ioctl(i32 %7, i32 %8, %struct.winsize* %6)
%10 = icmp eq i32 %9, -1
br i1 %10, label %15, label %11
11: ; preds = %2
%12 = getelementptr inbounds %struct.winsize, %struct.winsize* %6, i32 0, i32 0
%13 = load i32, i32* %12
%14 = icmp eq i32 %13, 0
br i1 %14, label %15, label %16
15: ; preds = %11, %2
store i32 -1, i32* %3
br label %23
16: ; preds = %11
%17 = getelementptr inbounds %struct.winsize, %struct.winsize* %6, i32 0, i32 0
%18 = load i32, i32* %17
%19 = load i32*, i32** %5
store i32 %18, i32* %19
%20 = getelementptr inbounds %struct.winsize, %struct.winsize* %6, i32 0, i32 1
%21 = load i32, i32* %20
%22 = load i32*, i32** %4
store i32 %21, i32* %22
store i32 0, i32* %3
br label %23
23: ; preds = %16, %15
%24 = load i32, i32* %3
ret i32 %24
}

LLVM IR (-O2):
%struct.winsize = type { i32, i32 }
@STDIN_FILENO = global i32 0
@TIOCGWINSZ = global i32 0
define i32 @get_window_size(i32* nocapture writeonly %0, i32* nocapture writeonly %1) {
%3 = alloca %struct.winsize
%4 = bitcast %struct.winsize* %3 to i8*
%5 = load i32, i32* @STDIN_FILENO
%6 = load i32, i32* @TIOCGWINSZ
%7 = call i32 @ioctl(i32 %5, i32 %6, %struct.winsize* %3)
%8 = icmp eq i32 %7, -1
%9 = getelementptr inbounds %struct.winsize, %struct.winsize* %3, i64 0, i32 0
%10 = load i32, i32* %9
%11 = icmp eq i32 %10, 0
%12 = select i1 %8, i1 true, i1 %11
br i1 %12, label %16, label %13
13: ; preds = %2
store i32 %10, i32* %1
%14 = getelementptr inbounds %struct.winsize, %struct.winsize* %3, i64 0, i32 1
%15 = load i32, i32* %14
store i32 %15, i32* %0
br label %16
16: ; preds = %2, %13
%17 = phi i32 [ 0, %13 ], [ -1, %2 ]
ret i32 %17
}