#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(char *, int, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
int ftell(int /*<<< orphan*/ *);
scalar_t__ malloc(int);
char *ReadStringFromFile(const char *fileName, int *outLen) {
  FILE *fIn = fopen(fileName, "rb");
  if (fIn == NULL) {
    if (outLen != NULL) {
      *outLen = 0;
    }
    return NULL;
  }
  fseek(fIn, 0, SEEK_END);
  int fileLen = ftell(fIn);
  fseek(fIn, 0, SEEK_SET);
  char *fileBuffer = (char *)malloc(fileLen + 1);
  fread(fileBuffer, 1, fileLen, fIn);
  fclose(fIn);
  fileBuffer[fileLen] = '\0';
  if (outLen != NULL) {
    *outLen = fileLen;
  }
  return fileBuffer;
}


x86 assembly (clang, -O0):
<ReadStringFromFile>:
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    11b1 <ReadStringFromFile+0x51>
cmpq   $0x0,-0x18(%rbp)
je     11a4 <ReadStringFromFile+0x44>
mov    -0x18(%rbp),%rax
movl   $0x0,(%rax)
movq   $0x0,-0x8(%rbp)
jmp    123a <ReadStringFromFile+0xda>
mov    -0x20(%rbp),%rdi
mov    0x2e2c(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x20(%rbp),%rdi
call   1050 <ftell@plt>
mov    %eax,-0x24(%rbp)
mov    -0x20(%rbp),%rdi
mov    0x2dfc(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1070 <fseek@plt>
mov    -0x24(%rbp),%edi
add    $0x1,%edi
call   1060 <malloc@plt>
mov    %rax,-0x30(%rbp)
mov    -0x30(%rbp),%rdi
mov    -0x24(%rbp),%edx
mov    -0x20(%rbp),%rcx
mov    $0x1,%esi
call   1030 <fread@plt>
mov    -0x20(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x30(%rbp),%rax
movslq -0x24(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
cmpq   $0x0,-0x18(%rbp)
je     1232 <ReadStringFromFile+0xd2>
mov    -0x24(%rbp),%ecx
mov    -0x18(%rbp),%rax
mov    %ecx,(%rax)
mov    -0x30(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<ReadStringFromFile>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
mov    %rsi,%r14
lea    0xe8e(%rip),%rsi
call   1080 <fopen@plt>
test   %rax,%rax
je     11f9 <ReadStringFromFile+0x99>
mov    %rax,%rbx
mov    0x2e62(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
mov    %rbx,%rdi
call   1050 <ftell@plt>
mov    %eax,%r15d
mov    0x2e34(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   1070 <fseek@plt>
lea    0x1(%r15),%edi
call   1060 <malloc@plt>
mov    %rax,%r12
mov    %rax,%rdi
mov    $0x1,%esi
mov    %r15d,%edx
mov    %rbx,%rcx
call   1030 <fread@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
movslq %r15d,%rax
movb   $0x0,(%r12,%rax,1)
mov    %r12,%rax
test   %r14,%r14
je     11ed <ReadStringFromFile+0x8d>
mov    %r15d,(%r14)
mov    %r12,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret
xor    %r15d,%r15d
mov    $0x0,%r12d
mov    $0x0,%eax
test   %r14,%r14
jne    11e7 <ReadStringFromFile+0x87>
jmp    11ed <ReadStringFromFile+0x8d>

LLVM IR (-O0):
@.str = [3 x i8] c"rb\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @ReadStringFromFile(i8* %0, i32* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i32*
%6 = alloca i32*
%7 = alloca i32
%8 = alloca i8*
store i8* %0, i8** %4
store i32* %1, i32** %5
%9 = load i8*, i8** %4
%10 = call i32* @fopen(i8* %9, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
store i32* %10, i32** %6
%11 = load i32*, i32** %6
%12 = icmp eq i32* %11, null
br i1 %12, label %13, label %19
13: ; preds = %2
%14 = load i32*, i32** %5
%15 = icmp ne i32* %14, null
br i1 %15, label %16, label %18
16: ; preds = %13
%17 = load i32*, i32** %5
store i32 0, i32* %17
br label %18
18: ; preds = %16, %13
store i8* null, i8** %3
br label %49
19: ; preds = %2
%20 = load i32*, i32** %6
%21 = load i32, i32* @SEEK_END
%22 = call i32 @fseek(i32* %20, i32 0, i32 %21)
%23 = load i32*, i32** %6
%24 = call i32 @ftell(i32* %23)
store i32 %24, i32* %7
%25 = load i32*, i32** %6
%26 = load i32, i32* @SEEK_SET
%27 = call i32 @fseek(i32* %25, i32 0, i32 %26)
%28 = load i32, i32* %7
%29 = add nsw i32 %28, 1
%30 = call i64 @malloc(i32 %29)
%31 = inttoptr i64 %30 to i8*
store i8* %31, i8** %8
%32 = load i8*, i8** %8
%33 = load i32, i32* %7
%34 = load i32*, i32** %6
%35 = call i32 @fread(i8* %32, i32 1, i32 %33, i32* %34)
%36 = load i32*, i32** %6
%37 = call i32 @fclose(i32* %36)
%38 = load i8*, i8** %8
%39 = load i32, i32* %7
%40 = sext i32 %39 to i64
%41 = getelementptr inbounds i8, i8* %38, i64 %40
store i8 0, i8* %41
%42 = load i32*, i32** %5
%43 = icmp ne i32* %42, null
br i1 %43, label %44, label %47
44: ; preds = %19
%45 = load i32, i32* %7
%46 = load i32*, i32** %5
store i32 %45, i32* %46
br label %47
47: ; preds = %44, %19
%48 = load i8*, i8** %8
store i8* %48, i8** %3
br label %49
49: ; preds = %47, %18
%50 = load i8*, i8** %3
ret i8* %50
}

LLVM IR (-O2):
@.str = [3 x i8] c"rb\00"
@SEEK_END = global i32 0
@SEEK_SET = global i32 0
define i8* @ReadStringFromFile(i8* nocapture %0, i32* writeonly %1) {
%3 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%4 = icmp eq i32* %3, null
br i1 %4, label %5, label %7
5: ; preds = %2
%6 = icmp eq i32* %1, null
br i1 %6, label %24, label %21
7: ; preds = %2
%8 = load i32, i32* @SEEK_END
%9 = tail call i32 @fseek(i32* %3, i32 0, i32 %8)
%10 = tail call i32 @ftell(i32* %3)
%11 = load i32, i32* @SEEK_SET
%12 = tail call i32 @fseek(i32* %3, i32 0, i32 %11)
%13 = add nsw i32 %10, 1
%14 = tail call i64 @malloc(i32 %13)
%15 = inttoptr i64 %14 to i8*
%16 = tail call i32 @fread(i8* %15, i32 1, i32 %10, i32* %3)
%17 = tail call i32 @fclose(i32* %3)
%18 = sext i32 %10 to i64
%19 = getelementptr inbounds i8, i8* %15, i64 %18
store i8 0, i8* %19
%20 = icmp eq i32* %1, null
br i1 %20, label %24, label %21
21: ; preds = %7, %5
%22 = phi i32 [ 0, %5 ], [ %10, %7 ]
%23 = phi i8* [ null, %5 ], [ %15, %7 ]
store i32 %22, i32* %1
br label %24
24: ; preds = %21, %7, %5
%25 = phi i8* [ null, %5 ], [ %15, %7 ], [ %23, %21 ]
ret i8* %25
}