#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*/ *fgets(char *, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fputs(char *, int /*<<< orphan*/);
int /*<<< orphan*/ *popen(char *, char *);
int /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ snprintf(char *, int, char *, char *);
int /*<<< orphan*/ *stdin;
int /*<<< orphan*/ stdout;
int strlen(char *);
int main(int argc, char *argv[]) {
  FILE *fd;
  char buffer[1024], command[1024];
  int n;
  printf("please enter the file path:\n");
  fgets(buffer, 1024, stdin);
  n = strlen(buffer);
  if (buffer[n - 1] == '\n')
    buffer[n - 1] = '\0';
  snprintf(command, 1024, "cat %s", buffer);
  fd = popen(command, "r");
  while (fgets(buffer, 1024, fd) != NULL) {
    fputs(buffer, stdout);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x830,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xe80(%rip),%rdi
call   1040 <printf@plt>
lea    -0x420(%rbp),%rdi
mov    0x2e55(%rip),%rax
mov    (%rax),%rdx
mov    $0x400,%esi
call   1070 <fgets@plt>
lea    -0x420(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0x824(%rbp)
mov    -0x824(%rbp),%eax
sub    $0x1,%eax
cltq
movsbl -0x420(%rbp,%rax,1),%eax
ff
cmp    $0xa,%eax
jne    11e1 <main+0x81>
mov    -0x824(%rbp),%eax
sub    $0x1,%eax
cltq
movb   $0x0,-0x420(%rbp,%rax,1)
lea    -0x820(%rbp),%rdi
lea    -0x420(%rbp),%rcx
mov    $0x400,%esi
lea    0xe22(%rip),%rdx
call   1050 <snprintf@plt>
lea    -0x820(%rbp),%rdi
lea    0xe16(%rip),%rsi
call   1080 <popen@plt>
mov    %rax,-0x18(%rbp)
lea    -0x420(%rbp),%rdi
mov    -0x18(%rbp),%rdx
mov    $0x400,%esi
call   1070 <fgets@plt>
cmp    $0x0,%rax
je     1250 <main+0xf0>
lea    -0x420(%rbp),%rdi
mov    0x2d94(%rip),%rax
mov    (%rax),%esi
call   1060 <fputs@plt>
jmp    1217 <main+0xb7>
xor    %eax,%eax
add    $0x830,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x800,%rsp
lea    0xe96(%rip),%rdi
call   1030 <puts@plt>
mov    0x2e69(%rip),%rax
mov    (%rax),%rdx
mov    %rsp,%rbx
mov    %rbx,%rdi
mov    $0x400,%esi
call   1070 <fgets@plt>
mov    %rbx,%rdi
call   1040 <strlen@plt>
cltq
cmpb   $0xa,-0x1(%rax,%rbx,1)
jne    11a8 <main+0x48>
movb   $0x0,-0x1(%rsp,%rax,1)
lea    0xe51(%rip),%rdx
lea    0x400(%rsp),%rbx
mov    %rsp,%r15
mov    %rbx,%rdi
mov    $0x400,%esi
mov    %r15,%rcx
call   1050 <snprintf@plt>
lea    0xe36(%rip),%rsi
mov    %rbx,%rdi
call   1080 <popen@plt>
mov    %rax,%r14
mov    %r15,%rdi
mov    $0x400,%esi
mov    %rax,%rdx
call   1070 <fgets@plt>
test   %rax,%rax
je     1220 <main+0xc0>
mov    0x2de0(%rip),%r15
mov    %rsp,%rbx
nopl   0x0(%rax,%rax,1)
mov    (%r15),%esi
mov    %rbx,%rdi
call   1060 <fputs@plt>
mov    %rbx,%rdi
mov    $0x400,%esi
mov    %r14,%rdx
call   1070 <fgets@plt>
test   %rax,%rax
jne    1200 <main+0xa0>
xor    %eax,%eax
add    $0x800,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [29 x i8] c"please enter the file path:\0A\00"
@stdin = global i32* null
@.str.1 = [7 x i8] c"cat %s\00"
@.str.2 = [2 x i8] c"r\00"
@stdout = global i32 0
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32*
%7 = alloca [1024 x i8]
%8 = alloca [1024 x i8]
%9 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%10 = call i32 @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str, i64 0, i64 0))
%11 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 0
%12 = load i32*, i32** @stdin
%13 = call i32* @fgets(i8* %11, i32 1024, i32* %12)
%14 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 0
%15 = call i32 @strlen(i8* %14)
store i32 %15, i32* %9
%16 = load i32, i32* %9
%17 = sub nsw i32 %16, 1
%18 = sext i32 %17 to i64
%19 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 %18
%20 = load i8, i8* %19
%21 = sext i8 %20 to i32
%22 = icmp eq i32 %21, 10
br i1 %22, label %23, label %28
23: ; preds = %2
%24 = load i32, i32* %9
%25 = sub nsw i32 %24, 1
%26 = sext i32 %25 to i64
%27 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 %26
store i8 0, i8* %27
br label %28
28: ; preds = %23, %2
%29 = getelementptr inbounds [1024 x i8], [1024 x i8]* %8, i64 0, i64 0
%30 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 0
%31 = call i32 @snprintf(i8* %29, i32 1024, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i8* %30)
%32 = getelementptr inbounds [1024 x i8], [1024 x i8]* %8, i64 0, i64 0
%33 = call i32* @popen(i8* %32, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
store i32* %33, i32** %6
br label %34
34: ; preds = %39, %28
%35 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 0
%36 = load i32*, i32** %6
%37 = call i32* @fgets(i8* %35, i32 1024, i32* %36)
%38 = icmp ne i32* %37, null
br i1 %38, label %39, label %43
39: ; preds = %34
%40 = getelementptr inbounds [1024 x i8], [1024 x i8]* %7, i64 0, i64 0
%41 = load i32, i32* @stdout
%42 = call i32 @fputs(i8* %40, i32 %41)
br label %34
43: ; preds = %34
ret i32 0
}

LLVM IR (-O2):
@stdin = global i32* null
@.str.1 = [7 x i8] c"cat %s\00"
@.str.2 = [2 x i8] c"r\00"
@stdout = global i32 0
@str = [28 x i8] c"please enter the file path:\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca [1024 x i8]
%4 = alloca [1024 x i8]
%5 = getelementptr inbounds [1024 x i8], [1024 x i8]* %3, i64 0, i64 0
%6 = getelementptr inbounds [1024 x i8], [1024 x i8]* %4, i64 0, i64 0
%7 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @str, i64 0, i64 0))
%8 = load i32*, i32** @stdin
%9 = call i32* @fgets(i8* %5, i32 1024, i32* %8)
%10 = call i32 @strlen(i8* %5)
%11 = add nsw i32 %10, -1
%12 = sext i32 %11 to i64
%13 = getelementptr inbounds [1024 x i8], [1024 x i8]* %3, i64 0, i64 %12
%14 = load i8, i8* %13
%15 = icmp eq i8 %14, 10
br i1 %15, label %16, label %17
16: ; preds = %2
store i8 0, i8* %13
br label %17
17: ; preds = %16, %2
%18 = call i32 @snprintf(i8* %6, i32 1024, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i8* %5)
%19 = call i32* @popen(i8* %6, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
%20 = call i32* @fgets(i8* %5, i32 1024, i32* %19)
%21 = icmp eq i32* %20, null
br i1 %21, label %27, label %22
22: ; preds = %17, %22
%23 = load i32, i32* @stdout
%24 = call i32 @fputs(i8* %5, i32 %23)
%25 = call i32* @fgets(i8* %5, i32 1024, i32* %19)
%26 = icmp eq i32* %25, null
br i1 %26, label %27, label %22
27: ; preds = %22, %17
ret i32 0
}