#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 */

/* Variables and functions */
int /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ read(char *);
int /*<<< orphan*/ read_backwards(char *);
int /*<<< orphan*/ write(char *);
int main() {
  printf("write data:\n");
  write("sample_file");
  printf("\n\nread data:\n");
  read("sample_file");
  printf("\n\nread data seeking backwards:\n");
  read_backwards("sample_file");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeaa(%rip),%rdi
call   1040 <printf@plt>
lea    0xeab(%rip),%rdi
call   1030 <write@plt>
lea    0xeab(%rip),%rdi
call   1040 <printf@plt>
lea    0xe93(%rip),%rdi
call   1060 <read@plt>
lea    0xea1(%rip),%rdi
call   1040 <printf@plt>
lea    0xe7b(%rip),%rdi
call   1050 <read_backwards@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xec4(%rip),%rdi
call   1030 <puts@plt>
lea    0xeac(%rip),%rbx
mov    %rbx,%rdi
call   1040 <write@plt>
lea    0xeb5(%rip),%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
call   1060 <read@plt>
lea    0xeae(%rip),%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
call   1050 <read_backwards@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [13 x i8] c"write data:\0A\00"
@.str.1 = [12 x i8] c"sample_file\00"
@.str.2 = [14 x i8] c"\0A\0Aread data:\0A\00"
@.str.3 = [32 x i8] c"\0A\0Aread data seeking backwards:\0A\00"
define i32 @main() {
%1 = alloca i32
store i32 0, i32* %1
%2 = call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0))
%3 = call i32 @write(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
%4 = call i32 @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.2, i64 0, i64 0))
%5 = call i32 @read(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
%6 = call i32 @printf(i8* getelementptr inbounds ([32 x i8], [32 x i8]* @.str.3, i64 0, i64 0))
%7 = call i32 @read_backwards(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [12 x i8] c"sample_file\00"
@str = [12 x i8] c"write data:\00"
@str.4 = [13 x i8] c"\0A\0Aread data:\00"
@str.5 = [31 x i8] c"\0A\0Aread data seeking backwards:\00"
define i32 @main() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @str, i64 0, i64 0))
%2 = tail call i32 @write(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @str.4, i64 0, i64 0))
%4 = tail call i32 @read(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([31 x i8], [31 x i8]* @str.5, i64 0, i64 0))
%6 = tail call i32 @read_backwards(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
ret i32 0
}