#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*/ SEEK_END;
int /*<<< orphan*/ SEEK_SET;
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char const *, char *);
int /*<<< orphan*/ fread(void *, int, long, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, long, int /*<<< orphan*/);
long ftell(int /*<<< orphan*/ *);
void *malloc(long);
void *read_config(const char *filename, long *size) {
  FILE *file = fopen(filename, "r");
  if (file == NULL)
    return NULL;
  fseek(file, 0L, SEEK_END);
  *size = ftell(file);
  fseek(file, 0L, SEEK_SET);
  void *buf = malloc(*size);
  fread(buf, 1, *size, file);
  fclose(file);
  return buf;
}


x86 assembly (clang, -O0):
<read_config>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe85(%rip),%rsi
call   1080 <fopen@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
jne    119c <read_config+0x3c>
movq   $0x0,-0x8(%rbp)
jmp    1215 <read_config+0xb5>
mov    -0x20(%rbp),%rdi
mov    0x2e41(%rip),%rax
mov    (%rax),%edx
xor    %eax,%eax
mov    %eax,%esi
call   1070 <fseek@plt>
mov    -0x20(%rbp),%rdi
call   1050 <ftell@plt>
mov    %rax,%rcx
mov    -0x18(%rbp),%rax
mov    %rcx,(%rax)
mov    -0x20(%rbp),%rdi
mov    0x2e08(%rip),%rax
mov    (%rax),%edx
xor    %eax,%eax
mov    %eax,%esi
call   1070 <fseek@plt>
mov    -0x18(%rbp),%rax
mov    (%rax),%rdi
call   1060 <malloc@plt>
mov    %rax,-0x28(%rbp)
mov    -0x28(%rbp),%rdi
mov    -0x18(%rbp),%rax
mov    (%rax),%rdx
mov    -0x20(%rbp),%rcx
mov    $0x1,%esi
call   1030 <fread@plt>
mov    -0x20(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x28(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<read_config>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r14
lea    0xe91(%rip),%rsi
call   1080 <fopen@plt>
test   %rax,%rax
je     11d8 <read_config+0x78>
mov    %rax,%rbx
mov    0x2e65(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
mov    %rbx,%rdi
call   1050 <ftell@plt>
mov    %rax,(%r14)
mov    0x2e37(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
mov    (%r14),%r15
mov    %r15,%rdi
call   1060 <malloc@plt>
mov    %rax,%r14
mov    %rax,%rdi
mov    $0x1,%esi
mov    %r15,%rdx
mov    %rbx,%rcx
call   1030 <fread@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
jmp    11db <read_config+0x7b>
xor    %r14d,%r14d
mov    %r14,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @read_config(i8* %0, i64* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i64*
%6 = alloca i32*
%7 = alloca i8*
store i8* %0, i8** %4
store i64* %1, i64** %5
%8 = load i8*, i8** %4
%9 = call i32* @fopen(i8* %8, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %9, i32** %6
%10 = load i32*, i32** %6
%11 = icmp eq i32* %10, null
br i1 %11, label %12, label %13
12: ; preds = %2
store i8* null, i8** %3
br label %34
13: ; preds = %2
%14 = load i32*, i32** %6
%15 = load i32, i32* @SEEK_END
%16 = call i32 @fseek(i32* %14, i64 0, i32 %15)
%17 = load i32*, i32** %6
%18 = call i64 @ftell(i32* %17)
%19 = load i64*, i64** %5
store i64 %18, i64* %19
%20 = load i32*, i32** %6
%21 = load i32, i32* @SEEK_SET
%22 = call i32 @fseek(i32* %20, i64 0, i32 %21)
%23 = load i64*, i64** %5
%24 = load i64, i64* %23
%25 = call i8* @malloc(i64 %24)
store i8* %25, i8** %7
%26 = load i8*, i8** %7
%27 = load i64*, i64** %5
%28 = load i64, i64* %27
%29 = load i32*, i32** %6
%30 = call i32 @fread(i8* %26, i32 1, i64 %28, i32* %29)
%31 = load i32*, i32** %6
%32 = call i32 @fclose(i32* %31)
%33 = load i8*, i8** %7
store i8* %33, i8** %3
br label %34
34: ; preds = %13, %12
%35 = load i8*, i8** %3
ret i8* %35
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define noalias i8* @read_config(i8* nocapture %0, i64* nocapture %1) {
%3 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%4 = icmp eq i32* %3, null
br i1 %4, label %15, label %5
5: ; preds = %2
%6 = load i32, i32* @SEEK_END
%7 = tail call i32 @fseek(i32* %3, i64 0, i32 %6)
%8 = tail call i64 @ftell(i32* %3)
store i64 %8, i64* %1
%9 = load i32, i32* @SEEK_SET
%10 = tail call i32 @fseek(i32* %3, i64 0, i32 %9)
%11 = load i64, i64* %1
%12 = tail call i8* @malloc(i64 %11)
%13 = tail call i32 @fread(i8* %12, i32 1, i64 %11, i32* %3)
%14 = tail call i32 @fclose(i32* %3)
br label %15
15: ; preds = %2, %5
%16 = phi i8* [ %12, %5 ], [ null, %2 ]
ret i8* %16
}