#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*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ fgets(char *, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fscanf(int /*<<< orphan*/ *, char *, char *);
int /*<<< orphan*/ printf(char *, char *);
main() {
  FILE *fp;
  char buff[255];
  fp = fopen("/tmp/test.txt", "r");
  fscanf(fp, "%s", buff);
  printf("1 %s\n", buff);
  fgets(buff, 255, (FILE *)fp);
  printf("2: %s\n", buff);
  fgets(buff, 255, (FILE *)fp);
  printf("3:%s\n", buff);
  fclose(fp);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x110,%rsp
lea    0xe9e(%rip),%rdi
lea    0xea5(%rip),%rsi
call   1070 <fopen@plt>
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
lea    -0x110(%rbp),%rdx
lea    0xe8c(%rip),%rsi
call   1050 <fscanf@plt>
lea    -0x110(%rbp),%rsi
lea    0xe7c(%rip),%rdi
call   1040 <printf@plt>
lea    -0x110(%rbp),%rdi
mov    -0x8(%rbp),%rdx
mov    $0xff,%esi
call   1060 <fgets@plt>
lea    -0x110(%rbp),%rsi
lea    0xe5a(%rip),%rdi
call   1040 <printf@plt>
lea    -0x110(%rbp),%rdi
mov    -0x8(%rbp),%rdx
mov    $0xff,%esi
call   1060 <fgets@plt>
lea    -0x110(%rbp),%rsi
lea    0xe39(%rip),%rdi
call   1040 <printf@plt>
mov    -0x8(%rbp),%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
add    $0x110,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0x108,%rsp
lea    0xe9f(%rip),%rdi
lea    0xea6(%rip),%rsi
call   1070 <fopen@plt>
mov    %rax,%rbx
lea    0xe99(%rip),%rsi
mov    %rsp,%r14
mov    %rax,%rdi
mov    %r14,%rdx
call   1050 <fscanf@plt>
lea    0xe87(%rip),%rdi
mov    %r14,%rsi
call   1040 <printf@plt>
mov    %r14,%rdi
mov    $0xff,%esi
mov    %rbx,%rdx
call   1060 <fgets@plt>
lea    0xe6e(%rip),%rdi
mov    %r14,%rsi
call   1040 <printf@plt>
mov    %r14,%rdi
mov    $0xff,%esi
mov    %rbx,%rdx
call   1060 <fgets@plt>
lea    0xe56(%rip),%rdi
mov    %r14,%rsi
call   1040 <printf@plt>
mov    %rbx,%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
add    $0x108,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [14 x i8] c"/tmp/test.txt\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [3 x i8] c"%s\00"
@.str.3 = [6 x i8] c"1 %s\0A\00"
@.str.4 = [7 x i8] c"2: %s\0A\00"
@.str.5 = [6 x i8] c"3:%s\0A\00"
define i32 @main() {
%1 = alloca i32*
%2 = alloca [255 x i8]
%3 = call i32* @fopen(i8* getelementptr inbounds ([14 x i8], [14 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** %1
%4 = load i32*, i32** %1
%5 = getelementptr inbounds [255 x i8], [255 x i8]* %2, i64 0, i64 0
%6 = call i32 @fscanf(i32* %4, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i8* %5)
%7 = getelementptr inbounds [255 x i8], [255 x i8]* %2, i64 0, i64 0
%8 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i8* %7)
%9 = getelementptr inbounds [255 x i8], [255 x i8]* %2, i64 0, i64 0
%10 = load i32*, i32** %1
%11 = call i32 @fgets(i8* %9, i32 255, i32* %10)
%12 = getelementptr inbounds [255 x i8], [255 x i8]* %2, i64 0, i64 0
%13 = call i32 @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.4, i64 0, i64 0), i8* %12)
%14 = getelementptr inbounds [255 x i8], [255 x i8]* %2, i64 0, i64 0
%15 = load i32*, i32** %1
%16 = call i32 @fgets(i8* %14, i32 255, i32* %15)
%17 = getelementptr inbounds [255 x i8], [255 x i8]* %2, i64 0, i64 0
%18 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.5, i64 0, i64 0), i8* %17)
%19 = load i32*, i32** %1
%20 = call i32 @fclose(i32* %19)
ret i32 0
}

LLVM IR (-O2):
@.str = [14 x i8] c"/tmp/test.txt\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [3 x i8] c"%s\00"
@.str.3 = [6 x i8] c"1 %s\0A\00"
@.str.4 = [7 x i8] c"2: %s\0A\00"
@.str.5 = [6 x i8] c"3:%s\0A\00"
define i32 @main() {
%1 = alloca [255 x i8]
%2 = getelementptr inbounds [255 x i8], [255 x i8]* %1, i64 0, i64 0
%3 = tail call i32* @fopen(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%4 = call i32 @fscanf(i32* %3, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i8* %2)
%5 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i8* %2)
%6 = call i32 @fgets(i8* %2, i32 255, i32* %3)
%7 = call i32 @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.4, i64 0, i64 0), i8* %2)
%8 = call i32 @fgets(i8* %2, i32 255, i32* %3)
%9 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.5, i64 0, i64 0), i8* %2)
%10 = call i32 @fclose(i32* %3)
ret i32 0
}