#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 */
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ errno;
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *, char *);
int /*<<< orphan*/ stderr;
char *strerror(int /*<<< orphan*/);
FILE *ckfopen(char *file, char *mode) {
  FILE *fp;
  if ((fp = fopen(file, mode)) == NULL) {
    fprintf(stderr, "Can't open %s: %s\n", file, strerror(errno));
    exit(2);
  }
  return fp;
}


x86 assembly (clang, -O0):
<ckfopen>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rdi
mov    -0x10(%rbp),%rsi
call   1040 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmp    $0x0,%rax
jne    11ad <ckfopen+0x6d>
mov    0x2e6e(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x24(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x20(%rbp)
mov    0x2e52(%rip),%rax
mov    (%rax),%edi
call   1060 <strerror@plt>
mov    -0x24(%rbp),%edi
mov    -0x20(%rbp),%rdx
mov    %rax,%rcx
lea    0xe62(%rip),%rsi
call   1030 <fprintf@plt>
mov    $0x2,%edi
call   1050 <exit@plt>
mov    -0x18(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<ckfopen>:
push   %rbp
push   %rbx
push   %rax
mov    %rdi,%rbx
call   1040 <fopen@plt>
test   %rax,%rax
je     1157 <ckfopen+0x17>
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret
mov    0x2e82(%rip),%rax
mov    (%rax),%ebp
mov    0x2e71(%rip),%rax
mov    (%rax),%edi
call   1060 <strerror@plt>
lea    0xe8b(%rip),%rsi
mov    %ebp,%edi
mov    %rbx,%rdx
mov    %rax,%rcx
call   1030 <fprintf@plt>
mov    $0x2,%edi
call   1050 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [19 x i8] c"Can't open %s: %s\0A\00"
@errno = global i32 0
define i32* @ckfopen(i8* %0, i8* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i32*
store i8* %0, i8** %3
store i8* %1, i8** %4
%6 = load i8*, i8** %3
%7 = load i8*, i8** %4
%8 = call i32* @fopen(i8* %6, i8* %7)
store i32* %8, i32** %5
%9 = icmp eq i32* %8, null
br i1 %9, label %10, label %17
10: ; preds = %2
%11 = load i32, i32* @stderr
%12 = load i8*, i8** %3
%13 = load i32, i32* @errno
%14 = call i8* @strerror(i32 %13)
%15 = call i32 @fprintf(i32 %11, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0), i8* %12, i8* %14)
%16 = call i32 @exit(i32 2)
unreachable
17: ; preds = %2
%18 = load i32*, i32** %5
ret i32* %18
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [19 x i8] c"Can't open %s: %s\0A\00"
@errno = global i32 0
define noalias i32* @ckfopen(i8* %0, i8* nocapture %1) {
%3 = tail call i32* @fopen(i8* %0, i8* %1)
%4 = icmp eq i32* %3, null
br i1 %4, label %5, label %11
5: ; preds = %2
%6 = load i32, i32* @stderr
%7 = load i32, i32* @errno
%8 = tail call i8* @strerror(i32 %7)
%9 = tail call i32 @fprintf(i32 %6, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0), i8* %0, i8* %8)
%10 = tail call i32 @exit(i32 2)
unreachable
11: ; preds = %2
ret i32* %3
}