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

```asm
<hex2passwd>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %rdi,(%rsp)
  mov    %esi,0xc(%rsp)
  mov    %rdx,0x10(%rsp)
  mov    %r8d,%r15d
  mov    %ecx,%eax
  sar    $0x4,%eax
  test   $0x10,%cl
  jne    L128
  mov    $0x4,%r12d
L12:
  sar    %eax
  add    $0x1,%r12d
  test   $0x1,%al
  je     L12
L115:
  mov    0xc(%rsp),%ebx
  lea    0x0(,%rbx,8),%eax
  cltd
  idiv   %r12d
  mov    %eax,0x2c(%rsp)
  lea    0x1(%rax),%edi
  mov    $0x1,%esi
  call   <calloc@plt>
  mov    %rax,0x18(%rsp)
  test   %ebx,%ebx
  jle    L62
  mov    %rax,%r14
  mov    %r12d,%ebp
  mov    $0x0,%r13d
  mov    $0x8,%eax
  sub    %r12d,%eax
  mov    %r12d,0x8(%rsp)
  mov    %eax,%r12d
  jmp    L24
L128:
  mov    $0x4,%r12d
  jmp    L115
L96:
  movslq %r13d,%rax
  mov    (%rsp),%rdx
  movzbl (%rdx,%rax,1),%ebx
  mov    %r12d,%ecx
  sar    %cl,%ebx
  shl    %cl,%ebx
  sar    %cl,%ebx
L60:
  movzbl %bl,%eax
  mov    0x10(%rsp),%rdi
  movzbl (%rdi,%rax,1),%edx
  mov    %dl,(%r14)
  test   %r15d,%r15d
  jne    L106
L20:
  add    0x8(%rsp),%ebp
  cmp    $0x7,%ebp
  jle    L102
  add    $0x1,%r13d
  sub    $0x8,%ebp
L102:
  add    $0x1,%r14
  cmp    0xc(%rsp),%r13d
  jge    L62
L24:
  cmp    0x8(%rsp),%ebp
  jl     L117
  test   %r15d,%r15d
  je     L96
  movslq %r13d,%rax
  mov    (%rsp),%rdx
  movzbl (%rdx,%rax,1),%edx
  movzbl 0x8(%rsp),%esi
  mov    %edx,%ecx
  lea    D20(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L96
L117:
  test   %r15d,%r15d
  jne    L90
  movslq %r13d,%rdx
  mov    (%rsp),%rdi
  movzbl (%rdi,%rdx,1),%eax
  mov    $0x8,%ecx
  sub    %ebp,%ecx
  sar    %cl,%eax
  mov    %r12d,%ecx
  shl    %cl,%eax
  sar    %cl,%eax
  mov    %eax,0x28(%rsp)
  movzbl -0x1(%rdi,%rdx,1),%ebx
  mov    0x8(%rsp),%eax
  sub    %ebp,%eax
  mov    $0x8,%ecx
  sub    %eax,%ecx
  shl    %cl,%ebx
  movzbl %bl,%ebx
  mov    %r12d,%ecx
  sar    %cl,%ebx
L119:
  add    0x28(%rsp),%bl
  jmp    L60
L90:
  movslq %r13d,%rax
  mov    (%rsp),%rsi
  lea    (%rsi,%rax,1),%rbx
  movzbl (%rbx),%r9d
  lea    -0x1(%rsi,%rax,1),%rax
  mov    %rax,0x20(%rsp)
  movzbl (%rax),%edx
  movzbl 0x8(%rsp),%esi
  sub    %ebp,%esi
  movzbl %sil,%esi
  sub    $0x8,%rsp
  push   %r9
  mov    %ebp,%r8d
  mov    %edx,%ecx
  lea    D26(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movzbl (%rbx),%esi
  mov    $0x8,%ecx
  sub    %ebp,%ecx
  sar    %cl,%esi
  mov    %r12d,%ecx
  shl    %cl,%esi
  sar    %cl,%esi
  mov    %sil,0x38(%rsp)
  movzbl %sil,%esi
  lea    D36(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    0x30(%rsp),%rdi
  movzbl (%rdi),%esi
  mov    0x18(%rsp),%eax
  sub    %ebp,%eax
  mov    $0x8,%ecx
  sub    %eax,%ecx
  shl    %cl,%esi
  movzbl %sil,%esi
  mov    %r12d,%ecx
  sar    %cl,%esi
  mov    %esi,%ebx
  lea    D47(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  add    $0x10,%rsp
  jmp    L119
L106:
  movzbl %dl,%edx
  movzbl %bl,%esi
  mov    %edx,%ecx
  lea    D48(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L20
L62:
  movslq 0x2c(%rsp),%rax
  mov    0x18(%rsp),%rdi
  movb   $0x0,(%rdi,%rax,1)
  mov    %rdi,%rax
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

tool_calls: name: retrieve_data
arguments: label: D20
type_guessed: string
name: retrieve_data
arguments: label: D26
type_guessed: string
name: retrieve_data
arguments: label: D36
type_guessed: string
name: retrieve_data
arguments: label: D47
type_guessed: string
name: retrieve_data
arguments: label: D48
type_guessed: string

tool: D20: DEBUG - Value is first %d bits of '%c' (%d)


tool: D26: DEBUG - Value is last %d bits of '%c' (%d) and first %d bits of '%c' (%d)


tool: D36: DEBUG - Intermediate value is %d


tool: D47: DEBUG - Intermediate othervalue is %d


tool: D48: DEBUG - Value %d maps to character '%c' (%d)


assistant: ```c
unsigned char *hex2passwd(unsigned char *hex, int len, unsigned char *mapping, int mappinglength, int dflag) {
  int charpos = 0;
  int bitpos = 0;
  int numbits = 4;
  int length = mappinglength >> 4;
  unsigned char value = 0;
  unsigned char othervalue = 0;
  int outpos = 0;
  while ((length & 0x01) == 0x00) {
    length >>= 1;
    numbits++;
  }
  bitpos = numbits;
  unsigned char *out = calloc(len * 8 / numbits + 1, sizeof(char));
  while (charpos < len) {
    if (bitpos >= numbits) {
      if (dflag)
        printf("DEBUG - Value is first %d bits of '%c' (%d)\n", numbits, hex[charpos], hex[charpos]);
      value = (hex[charpos] >> (8 - numbits));
      value = (value << (8 - numbits)) >> (8 - numbits);
    } else {
      if (dflag)
        printf("DEBUG - Value is last %d bits of '%c' (%d) and first %d bits of '%c' (%d)\n", numbits - bitpos, hex[charpos - 1], hex[charpos - 1], bitpos, hex[charpos], hex[charpos]);
      value = (hex[charpos] >> (8 - bitpos));
      value = (value << (8 - numbits)) >> (8 - numbits);
      if (dflag)
        printf("DEBUG - Intermediate value is %d\n", value);
      othervalue = hex[charpos - 1] << (8 - (numbits - bitpos));
      othervalue = othervalue >> (8 - numbits);
      if (dflag)
        printf("DEBUG - Intermediate othervalue is %d\n", othervalue);
      value = value + othervalue;
    }
    out[outpos] = mapping[value];
    if (dflag)
      printf("DEBUG - Value %d maps to character '%c' (%d)\n", value, out[outpos], out[outpos]);
    bitpos += numbits;
    if (bitpos >= 8) {
      charpos++;
      bitpos -= 8;
    }
    outpos++;
  };
  out[len * 8 / numbits] = 0x00;
  return out;
}
```