user: Demonstrate the C code that generates the assembly output below:

```asm
<hlp_file_randmod>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x50,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %esi,-0x2c(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    %rcx,-0x40(%rbp)
  mov    %r8,-0x48(%rbp)
  movq   $0x0,-0x8(%rbp)
  mov    $0x1,%edi
  call   <malloc@plt>
  mov    %rax,-0x8(%rbp)
  cmpq   $0x0,-0x8(%rbp)
  jne    L185
  mov    D44(%rip),%rax
  mov    (%rax),%eax
  jmp    L169
L185:
  mov    D29(%rip),%rax
  mov    (%rax),%edx
  mov    -0x28(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <open@plt>
  mov    %eax,-0x10(%rbp)
  cmpl   $0x0,-0x10(%rbp)
  jns    L42
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    D44(%rip),%rax
  mov    (%rax),%eax
  jmp    L169
L42:
  mov    D48(%rip),%rax
  mov    (%rax),%edx
  mov    -0x10(%rbp),%eax
  mov    $0x0,%esi
  mov    %eax,%edi
  call   <lseek@plt>
  mov    %eax,-0xc(%rbp)
  cmpl   $0x0,-0xc(%rbp)
  jns    L165
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x10(%rbp),%eax
  mov    %eax,%edi
  call   <close@plt>
  mov    D44(%rip),%rax
  mov    (%rax),%eax
  jmp    L169
L165:
  mov    $0x0,%eax
  call   <sranddev@plt>
  movl   $0x0,-0x1c(%rbp)
  jmp    L143
L22:
  movl   $0x1,-0x14(%rbp)
  jmp    L127
L74:
  mov    $0x0,%eax
  call   <rand@plt>
  mov    -0x1c(%rbp),%edx
  lea    0x0(,%rdx,4),%rcx
  mov    -0x38(%rbp),%rdx
  add    %rdx,%rcx
  cltd
  idivl  -0xc(%rbp)
  mov    %edx,%eax
  mov    %eax,(%rcx)
  movl   $0x0,-0x14(%rbp)
  mov    -0x1c(%rbp),%eax
  sub    $0x1,%eax
  mov    %eax,-0x18(%rbp)
  jmp    L75
L62:
  mov    -0x18(%rbp),%eax
  lea    0x0(,%rax,4),%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x1c(%rbp),%eax
  lea    0x0(,%rax,4),%rcx
  mov    -0x38(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  jne    L119
  movl   $0x1,-0x14(%rbp)
L119:
  subl   $0x1,-0x18(%rbp)
L75:
  mov    -0x18(%rbp),%eax
  cmp    -0x1c(%rbp),%eax
  jbe    L62
L127:
  cmpl   $0x0,-0x14(%rbp)
  jne    L74
  mov    -0x1c(%rbp),%eax
  lea    0x0(,%rax,4),%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x8(%rbp),%rsi
  mov    -0x10(%rbp),%eax
  mov    %edx,%ecx
  mov    $0x1,%edx
  mov    %eax,%edi
  call   <pread@plt>
  cmp    $0x1,%eax
  je     L76
  mov    -0x10(%rbp),%eax
  mov    %eax,%edi
  call   <close@plt>
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    D44(%rip),%rax
  mov    (%rax),%eax
  jmp    L169
L76:
  mov    -0x1c(%rbp),%edx
  mov    -0x40(%rbp),%rax
  add    %rax,%rdx
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  mov    %al,(%rdx)
  mov    -0x1c(%rbp),%edx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  mov    -0x1c(%rbp),%ecx
  mov    -0x48(%rbp),%rdx
  add    %rcx,%rdx
  movzbl (%rax),%eax
  mov    %al,(%rdx)
  jmp    L178
L115:
  mov    $0x0,%eax
  call   <rand@plt>
  cltd
  shr    $0x18,%edx
  add    %edx,%eax
  movzbl %al,%eax
  sub    %edx,%eax
  mov    %eax,%ecx
  mov    -0x1c(%rbp),%edx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    %ecx,%edx
  mov    %dl,(%rax)
L178:
  mov    -0x1c(%rbp),%edx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%edx
  mov    -0x1c(%rbp),%ecx
  mov    -0x40(%rbp),%rax
  add    %rcx,%rax
  movzbl (%rax),%eax
  cmp    %al,%dl
  je     L115
  mov    -0x1c(%rbp),%eax
  lea    0x0(,%rax,4),%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x1c(%rbp),%ecx
  mov    -0x48(%rbp),%rax
  lea    (%rcx,%rax,1),%rsi
  mov    -0x10(%rbp),%eax
  mov    %edx,%ecx
  mov    $0x1,%edx
  mov    %eax,%edi
  call   <pwrite@plt>
  cmp    $0x1,%eax
  je     L123
  mov    -0x10(%rbp),%eax
  mov    %eax,%edi
  call   <close@plt>
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    D44(%rip),%rax
  mov    (%rax),%eax
  jmp    L169
L123:
  addl   $0x1,-0x1c(%rbp)
L143:
  mov    -0x1c(%rbp),%eax
  cmp    -0x2c(%rbp),%eax
  jb     L22
  mov    -0x10(%rbp),%eax
  mov    %eax,%edi
  call   <close@plt>
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0x0,%eax
L169:
  leave
  ret
```

assistant: ```c
int hlp_file_randmod(const char *path, unsigned int mod_amount, off_t *positions, unsigned char *orig_chars, unsigned char *mod_chars) {
  off_t filesize;
  int fd;
  unsigned int i, j, flag;
  void *buf = NULL;
  buf = malloc(1);
  if (NULL == buf)
    return errno;
  fd = open(path, O_RDWR);
  if (fd < 0) {
    free(buf);
    return errno;
  }
  filesize = lseek(fd, 0, SEEK_END);
  if (filesize < 0) {
    free(buf);
    close(fd);
    return errno;
  }
  sranddev();
  for (i = 0; i < mod_amount; i++) {
    flag = 1;
    while (flag) {
      positions[i] = (rand() % filesize);
      flag = 0;
      for (j = i - 1; j <= i; j--)
        if (positions[j] == positions[i])
          flag = 1;
    }
    if (1 != pread(fd, buf, 1, positions[i])) {
      close(fd);
      free(buf);
      return errno;
    }
    orig_chars[i] = (*(unsigned char *)buf);
    mod_chars[i] = orig_chars[i];
    while (mod_chars[i] == orig_chars[i])
      mod_chars[i] = (unsigned char)(rand() % 256);
    if (1 != pwrite(fd, &(mod_chars[i]), 1, positions[i])) {
      close(fd);
      free(buf);
      return errno;
    }
  }
  close(fd);
  free(buf);
  return 0;
}
```