#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*/ fprintf(int /*<<< orphan*/ *, char *);
int /*<<< orphan*/ fputc(char, int /*<<< orphan*/ *);
int /*<<< orphan*/ fputs(char *, int /*<<< orphan*/ *);
int /*<<< orphan*/ fseek(int /*<<< orphan*/ *, int, int /*<<< orphan*/);
int main(void) {
  FILE *fp;
  fp = fopen("./testfile", "w");
  fprintf(fp, "this is a test file of file operation");
  fseek(fp, 2, SEEK_SET);
  fputs("at", fp);
  fseek(fp, -1, SEEK_END);
  fputc('a', fp);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xe9a(%rip),%rdi
lea    0xe9e(%rip),%rsi
call   1070 <fopen@plt>
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xe8c(%rip),%rsi
call   1050 <fprintf@plt>
mov    -0x10(%rbp),%rdi
mov    0x2e47(%rip),%rax
mov    (%rax),%edx
mov    $0x2,%esi
call   1060 <fseek@plt>
mov    -0x10(%rbp),%rsi
lea    0xe8b(%rip),%rdi
call   1030 <fputs@plt>
mov    -0x10(%rbp),%rdi
mov    0x2e30(%rip),%rax
mov    (%rax),%edx
mov    $0xffffffff,%esi
call   1060 <fseek@plt>
mov    -0x10(%rbp),%rsi
mov    $0x61,%edi
call   1040 <fputc@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xeb8(%rip),%rdi
lea    0xebc(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,%rbx
lea    0xeaf(%rip),%rdi
mov    $0x25,%esi
mov    $0x1,%edx
mov    %rax,%rcx
call   1060 <fwrite@plt>
mov    0x2e61(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
mov    $0x2,%esi
call   1040 <fseek@plt>
lea    0xea6(%rip),%rdi
mov    $0x2,%esi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1060 <fwrite@plt>
mov    0x2e42(%rip),%rax
mov    (%rax),%edx
mov    %rbx,%rdi
mov    $0xffffffff,%esi
call   1040 <fseek@plt>
mov    $0x61,%edi
mov    %rbx,%rsi
call   1030 <fputc@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [11 x i8] c"./testfile\00"
@.str.1 = [2 x i8] c"w\00"
@.str.2 = [38 x i8] c"this is a test file of file operation\00"
@SEEK_SET = global i32 0
@.str.3 = [3 x i8] c"at\00"
@SEEK_END = global i32 0
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
store i32 0, i32* %1
%3 = call i32* @fopen(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %3, i32** %2
%4 = load i32*, i32** %2
%5 = call i32 @fprintf(i32* %4, i8* getelementptr inbounds ([38 x i8], [38 x i8]* @.str.2, i64 0, i64 0))
%6 = load i32*, i32** %2
%7 = load i32, i32* @SEEK_SET
%8 = call i32 @fseek(i32* %6, i32 2, i32 %7)
%9 = load i32*, i32** %2
%10 = call i32 @fputs(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), i32* %9)
%11 = load i32*, i32** %2
%12 = load i32, i32* @SEEK_END
%13 = call i32 @fseek(i32* %11, i32 -1, i32 %12)
%14 = load i32*, i32** %2
%15 = call i32 @fputc(i8 signext 97, i32* %14)
ret i32 0
}

LLVM IR (-O2):
@.str = [11 x i8] c"./testfile\00"
@.str.1 = [2 x i8] c"w\00"
@.str.2 = [38 x i8] c"this is a test file of file operation\00"
@SEEK_SET = global i32 0
@.str.3 = [3 x i8] c"at\00"
@SEEK_END = global i32 0
define i32 @main() {
%1 = tail call i32* @fopen(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%2 = tail call i64 @fwrite(i8* getelementptr inbounds ([38 x i8], [38 x i8]* @.str.2, i64 0, i64 0), i64 37, i64 1, i32* %1)
%3 = load i32, i32* @SEEK_SET
%4 = tail call i32 @fseek(i32* %1, i32 2, i32 %3)
%5 = tail call i64 @fwrite(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0), i64 2, i64 1, i32* %1)
%6 = load i32, i32* @SEEK_END
%7 = tail call i32 @fseek(i32* %1, i32 -1, i32 %6)
%8 = tail call i32 @fputc(i8 signext 97, i32* %1)
ret i32 0
}