#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;
char *calloc(int, long);
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int fread(char *, long, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ free(char *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, long, int /*<<< orphan*/);
long ftell(int /*<<< orphan*/ *);
int /*<<< orphan*/ *open_file(char const *const, char *);
int /*<<< orphan*/ rewind(int /*<<< orphan*/ *);
char *read_file_str(const char *const file_name) {
  FILE *fp;
  long size;
  char *buffer;
  fp = open_file(file_name, "rb");
  if (!fp) {
    return NULL;
  }
  fseek(fp, 0L, SEEK_END);
  size = ftell(fp);
  if (size == -1) {
    fclose(fp);
    return NULL;
  }
  rewind(fp);
  buffer = calloc(1, size + 1);
  if (buffer == NULL) {
    fclose(fp);
    return NULL;
  }
  if (fread(buffer, size, 1, fp) != 1) {
    fclose(fp);
    free(buffer);
    return NULL;
  }
  fclose(fp);
  return buffer;
}


x86 assembly (clang, -O0):
<read_file_str>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe69(%rip),%rsi
call   1060 <open_file@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11b8 <read_file_str+0x38>
movq   $0x0,-0x8(%rbp)
jmp    128b <read_file_str+0x10b>
mov    -0x18(%rbp),%rdi
mov    0x2e25(%rip),%rax
mov    (%rax),%edx
xor    %eax,%eax
mov    %eax,%esi
call   10a0 <fseek@plt>
mov    -0x18(%rbp),%rdi
call   1090 <ftell@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0xffffffffffffffff,-0x20(%rbp)
jne    11fc <read_file_str+0x7c>
mov    -0x18(%rbp),%rdi
call   1050 <fclose@plt>
movq   $0x0,-0x8(%rbp)
jmp    128b <read_file_str+0x10b>
mov    -0x18(%rbp),%rdi
call   1070 <rewind@plt>
mov    -0x20(%rbp),%rsi
add    $0x1,%rsi
mov    $0x1,%edi
call   1080 <calloc@plt>
mov    %rax,-0x28(%rbp)
cmpq   $0x0,-0x28(%rbp)
jne    123c <read_file_str+0xbc>
mov    -0x18(%rbp),%rdi
call   1050 <fclose@plt>
movq   $0x0,-0x8(%rbp)
jmp    128b <read_file_str+0x10b>
mov    -0x28(%rbp),%rdi
mov    -0x20(%rbp),%rsi
mov    -0x18(%rbp),%rcx
mov    $0x1,%edx
call   1040 <fread@plt>
cmp    $0x1,%eax
je     127a <read_file_str+0xfa>
mov    -0x18(%rbp),%rdi
call   1050 <fclose@plt>
mov    -0x28(%rbp),%rdi
call   1030 <free@plt>
movq   $0x0,-0x8(%rbp)
jmp    128b <read_file_str+0x10b>
mov    -0x18(%rbp),%rdi
call   1050 <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_file_str>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
lea    0xe72(%rip),%rsi
call   1060 <open_file@plt>
test   %rax,%rax
je     1211 <read_file_str+0x91>
mov    %rax,%rbx
mov    0x2e46(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
xor    %esi,%esi
call   10a0 <fseek@plt>
mov    %rbx,%rdi
call   1090 <ftell@plt>
cmp    $0xffffffffffffffff,%rax
je     1209 <read_file_str+0x89>
mov    %rax,%r15
mov    %rbx,%rdi
call   1070 <rewind@plt>
lea    0x1(%r15),%rsi
mov    $0x1,%edi
call   1080 <calloc@plt>
test   %rax,%rax
je     1209 <read_file_str+0x89>
mov    %rax,%r14
mov    %rax,%rdi
mov    %r15,%rsi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1040 <fread@plt>
mov    %eax,%ebp
mov    %rbx,%rdi
call   1050 <fclose@plt>
cmp    $0x1,%ebp
je     1214 <read_file_str+0x94>
mov    %r14,%rdi
call   1030 <free@plt>
jmp    1211 <read_file_str+0x91>
mov    %rbx,%rdi
call   1050 <fclose@plt>
xor    %r14d,%r14d
mov    %r14,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

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

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