#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 *, char *);
int /*<<< orphan*/ fread(char *, long, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
long ftell(int /*<<< orphan*/ *);
scalar_t__ malloc(long);
char *readFile(char *file) {
  FILE *fptr;
  long length;
  char *buf;
  if (file == NULL)
    return NULL;
  fptr = fopen(file, "rb");
  if (!fptr)
    return NULL;
  fseek(fptr, 0, SEEK_END);
  length = ftell(fptr);
  buf = (char *)malloc(length + 1);
  fseek(fptr, 0, SEEK_SET);
  fread(buf, length, 1, fptr);
  fclose(fptr);
  buf[length] = 0;
  return buf;
}


x86 assembly (clang, -O0):
<readFile>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    1184 <readFile+0x24>
movq   $0x0,-0x8(%rbp)
jmp    1229 <readFile+0xc9>
mov    -0x10(%rbp),%rdi
lea    0xe71(%rip),%rsi
call   1080 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11b0 <readFile+0x50>
movq   $0x0,-0x8(%rbp)
jmp    1229 <readFile+0xc9>
mov    -0x18(%rbp),%rdi
mov    0x2e2d(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x18(%rbp),%rdi
call   1050 <ftell@plt>
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rdi
add    $0x1,%rdi
call   1060 <malloc@plt>
mov    %rax,-0x28(%rbp)
mov    -0x18(%rbp),%rdi
mov    0x2deb(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x28(%rbp),%rdi
mov    -0x20(%rbp),%rsi
mov    -0x18(%rbp),%rcx
mov    $0x1,%edx
call   1030 <fread@plt>
mov    -0x18(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x28(%rbp),%rax
mov    -0x20(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x28(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<readFile>:
push   %r15
push   %r14
push   %rbx
test   %rdi,%rdi
je     11dd <readFile+0x7d>
lea    0xe8f(%rip),%rsi
call   1080 <fopen@plt>
test   %rax,%rax
je     11dd <readFile+0x7d>
mov    %rax,%r14
mov    0x2e63(%rip),%rax
mov    (%rax),%edx
mov    %r14,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
mov    %r14,%rdi
call   1050 <ftell@plt>
mov    %rax,%r15
lea    0x1(%rax),%rdi
call   1060 <malloc@plt>
mov    %rax,%rbx
mov    0x2e29(%rip),%rax
mov    (%rax),%edx
mov    %r14,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
mov    %rbx,%rdi
mov    %r15,%rsi
mov    $0x1,%edx
mov    %r14,%rcx
call   1030 <fread@plt>
mov    %r14,%rdi
call   1040 <fclose@plt>
movb   $0x0,(%rbx,%r15,1)
jmp    11df <readFile+0x7f>
xor    %ebx,%ebx
mov    %rbx,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [3 x i8] c"rb\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @readFile(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
%4 = alloca i32*
%5 = alloca i64
%6 = alloca i8*
store i8* %0, i8** %3
%7 = load i8*, i8** %3
%8 = icmp eq i8* %7, null
br i1 %8, label %9, label %10
9: ; preds = %1
store i8* null, i8** %2
br label %39
10: ; preds = %1
%11 = load i8*, i8** %3
%12 = call i32* @fopen(i8* %11, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
store i32* %12, i32** %4
%13 = load i32*, i32** %4
%14 = icmp ne i32* %13, null
br i1 %14, label %16, label %15
15: ; preds = %10
store i8* null, i8** %2
br label %39
16: ; preds = %10
%17 = load i32*, i32** %4
%18 = load i32, i32* @SEEK_END
%19 = call i32 @fseek(i32* %17, i32 0, i32 %18)
%20 = load i32*, i32** %4
%21 = call i64 @ftell(i32* %20)
store i64 %21, i64* %5
%22 = load i64, i64* %5
%23 = add nsw i64 %22, 1
%24 = call i64 @malloc(i64 %23)
%25 = inttoptr i64 %24 to i8*
store i8* %25, i8** %6
%26 = load i32*, i32** %4
%27 = load i32, i32* @SEEK_SET
%28 = call i32 @fseek(i32* %26, i32 0, i32 %27)
%29 = load i8*, i8** %6
%30 = load i64, i64* %5
%31 = load i32*, i32** %4
%32 = call i32 @fread(i8* %29, i64 %30, i32 1, i32* %31)
%33 = load i32*, i32** %4
%34 = call i32 @fclose(i32* %33)
%35 = load i8*, i8** %6
%36 = load i64, i64* %5
%37 = getelementptr inbounds i8, i8* %35, i64 %36
store i8 0, i8* %37
%38 = load i8*, i8** %6
store i8* %38, i8** %2
br label %39
39: ; preds = %16, %15, %9
%40 = load i8*, i8** %2
ret i8* %40
}

LLVM IR (-O2):
@.str = [3 x i8] c"rb\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @readFile(i8* %0) {
%2 = icmp eq i8* %0, null
br i1 %2, label %18, label %3
3: ; preds = %1
%4 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%5 = icmp eq i32* %4, null
br i1 %5, label %18, label %6
6: ; preds = %3
%7 = load i32, i32* @SEEK_END
%8 = tail call i32 @fseek(i32* %4, i32 0, i32 %7)
%9 = tail call i64 @ftell(i32* %4)
%10 = add nsw i64 %9, 1
%11 = tail call i64 @malloc(i64 %10)
%12 = inttoptr i64 %11 to i8*
%13 = load i32, i32* @SEEK_SET
%14 = tail call i32 @fseek(i32* %4, i32 0, i32 %13)
%15 = tail call i32 @fread(i8* %12, i64 %9, i32 1, i32* %4)
%16 = tail call i32 @fclose(i32* %4)
%17 = getelementptr inbounds i8, i8* %12, i64 %9
store i8 0, i8* %17
br label %18
18: ; preds = %3, %1, %6
%19 = phi i8* [ %12, %6 ], [ null, %1 ], [ null, %3 ]
ret i8* %19
}