#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*/ *fopen(char *, char *);
int /*<<< orphan*/ fread(char *, size_t, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int /*<<< orphan*/,
                         int /*<<< orphan*/);
size_t ftell(int /*<<< orphan*/ *);
scalar_t__ malloc(size_t);
char *read_file_and_null_terminate(char *file_path) {
  char *result = 0;
  FILE *file = fopen(file_path, "r");
  if (file) {
    fseek(file, 0, SEEK_END);
    size_t file_size = ftell(file);
    fseek(file, 0, SEEK_SET);
    result = (char *)malloc(file_size + 1);
    fread(result, file_size, 1, file);
    result[file_size] = 0;
  }
  return result;
}


x86 assembly (clang, -O0):
<read_file_and_null_terminate>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
movq   $0x0,-0x10(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xe91(%rip),%rsi
call   1070 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
je     11eb <read_file_and_null_terminate+0x9b>
mov    -0x18(%rbp),%rdi
mov    0x2e5a(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1060 <fseek@plt>
mov    -0x18(%rbp),%rdi
call   1040 <ftell@plt>
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rdi
mov    0x2e29(%rip),%rax
mov    (%rax),%edx
xor    %esi,%esi
call   1060 <fseek@plt>
mov    -0x20(%rbp),%rdi
add    $0x1,%rdi
call   1050 <malloc@plt>
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
mov    -0x20(%rbp),%rsi
mov    -0x18(%rbp),%rcx
mov    $0x1,%edx
call   1030 <fread@plt>
mov    -0x10(%rbp),%rax
mov    -0x20(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x10(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<read_file_and_null_terminate>:
push   %r15
push   %r14
push   %rbx
lea    0xea4(%rip),%rsi
call   1070 <fopen@plt>
test   %rax,%rax
je     11c0 <read_file_and_null_terminate+0x70>
mov    %rax,%r14
mov    0x2e78(%rip),%rax
mov    (%rax),%edx
mov    %r14,%rdi
xor    %esi,%esi
call   1060 <fseek@plt>
mov    %r14,%rdi
call   1040 <ftell@plt>
mov    %rax,%r15
mov    0x2e4a(%rip),%rax
mov    (%rax),%edx
mov    %r14,%rdi
xor    %esi,%esi
call   1060 <fseek@plt>
lea    0x1(%r15),%rdi
call   1050 <malloc@plt>
mov    %rax,%rbx
mov    %rax,%rdi
mov    %r15,%rsi
mov    $0x1,%edx
mov    %r14,%rcx
call   1030 <fread@plt>
movb   $0x0,(%rbx,%r15,1)
jmp    11c2 <read_file_and_null_terminate+0x72>
xor    %ebx,%ebx
mov    %rbx,%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_file_and_null_terminate(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
%4 = alloca i32*
%5 = alloca i64
store i8* %0, i8** %2
store i8* null, i8** %3
%6 = load i8*, i8** %2
%7 = call i32* @fopen(i8* %6, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %7, i32** %4
%8 = load i32*, i32** %4
%9 = icmp ne i32* %8, null
br i1 %9, label %10, label %30
10: ; preds = %1
%11 = load i32*, i32** %4
%12 = load i32, i32* @SEEK_END
%13 = call i32 @fseek(i32* %11, i32 0, i32 %12)
%14 = load i32*, i32** %4
%15 = call i64 @ftell(i32* %14)
store i64 %15, i64* %5
%16 = load i32*, i32** %4
%17 = load i32, i32* @SEEK_SET
%18 = call i32 @fseek(i32* %16, i32 0, i32 %17)
%19 = load i64, i64* %5
%20 = add i64 %19, 1
%21 = call i64 @malloc(i64 %20)
%22 = inttoptr i64 %21 to i8*
store i8* %22, i8** %3
%23 = load i8*, i8** %3
%24 = load i64, i64* %5
%25 = load i32*, i32** %4
%26 = call i32 @fread(i8* %23, i64 %24, i32 1, i32* %25)
%27 = load i8*, i8** %3
%28 = load i64, i64* %5
%29 = getelementptr inbounds i8, i8* %27, i64 %28
store i8 0, i8* %29
br label %30
30: ; preds = %10, %1
%31 = load i8*, i8** %3
ret i8* %31
}

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