user: What would the C source look like for the assembly code provided here?

```asm
<cmyth_utf8tolatin1>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x38(%rbp)
  movq   $0x0,-0x18(%rbp)
  movl   $0x0,-0x24(%rbp)
  movl   $0x0,-0x20(%rbp)
  mov    -0x38(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  add    $0x1,%rax
  mov    $0x0,%ecx
  mov    $0x0,%edx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <__ref_alloc@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  movb   $0x0,(%rax)
  jmp    L68
L306:
  cmpl   $0x5,-0x24(%rbp)
  ja     L577
  mov    -0x24(%rbp),%eax
  lea    0x0(,%rax,4),%rdx
  lea    D33(%rip),%rax
  mov    (%rdx,%rax,1),%eax
  cltq
  lea    D33(%rip),%rdx
  add    %rdx,%rax
  notrack jmp *%rax
  movq   $0x0,-0x18(%rbp)
  mov    -0x1c(%rbp),%eax
  and    $0xfe,%eax
  cmp    $0xfc,%eax
  jne    L480
  mov    -0x1c(%rbp),%eax
  shl    $0x1e,%eax
  cltq
  and    $0x40000000,%eax
  mov    %rax,-0x18(%rbp)
  movl   $0x6,-0x20(%rbp)
  movl   $0x5,-0x24(%rbp)
  jmp    L354
L480:
  mov    -0x1c(%rbp),%eax
  and    $0xfc,%eax
  cmp    $0xf8,%eax
  jne    L460
  mov    -0x1c(%rbp),%eax
  shl    $0x18,%eax
  cltq
  and    $0x3000000,%eax
  mov    %rax,-0x18(%rbp)
  movl   $0x5,-0x20(%rbp)
  movl   $0x4,-0x24(%rbp)
  jmp    L354
L460:
  mov    -0x1c(%rbp),%eax
  and    $0xf8,%eax
  cmp    $0xf0,%eax
  jne    L553
  mov    -0x1c(%rbp),%eax
  shl    $0x12,%eax
  cltq
  and    $0x1c0000,%eax
  mov    %rax,-0x18(%rbp)
  movl   $0x4,-0x20(%rbp)
  movl   $0x3,-0x24(%rbp)
  jmp    L354
L553:
  mov    -0x1c(%rbp),%eax
  and    $0xf0,%eax
  cmp    $0xe0,%eax
  jne    L259
  mov    -0x1c(%rbp),%eax
  shl    $0xc,%eax
  cltq
  and    $0xffff,%eax
  mov    %rax,-0x18(%rbp)
  movl   $0x3,-0x20(%rbp)
  movl   $0x2,-0x24(%rbp)
  jmp    L354
L259:
  mov    -0x1c(%rbp),%eax
  and    $0xe0,%eax
  cmp    $0xc0,%eax
  jne    L156
  mov    -0x1c(%rbp),%eax
  shl    $0x6,%eax
  cltq
  and    $0x7c0,%eax
  mov    %rax,-0x18(%rbp)
  movl   $0x2,-0x20(%rbp)
  movl   $0x1,-0x24(%rbp)
  jmp    L354
L156:
  mov    -0x1c(%rbp),%eax
  and    $0x80,%eax
  test   %eax,%eax
  jne    L354
  mov    -0x1c(%rbp),%eax
  cltq
  and    $0x7f,%eax
  mov    %rax,-0x18(%rbp)
  movl   $0x1,-0x20(%rbp)
  movl   $0x0,-0x24(%rbp)
  jmp    L354
  mov    -0x1c(%rbp),%eax
  and    $0xc0,%eax
  cmp    $0x80,%eax
  jne    L324
  mov    -0x1c(%rbp),%eax
  cltq
  and    $0x3f,%eax
  or     %rax,-0x18(%rbp)
  cmpq   $0x7f,-0x18(%rbp)
  jbe    L538
  cmpq   $0x7ff,-0x18(%rbp)
  jbe    L167
L538:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  jmp    L167
L324:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
L167:
  movl   $0x0,-0x24(%rbp)
  jmp    L294
  mov    -0x1c(%rbp),%eax
  and    $0xc0,%eax
  cmp    $0x80,%eax
  jne    L242
  mov    -0x1c(%rbp),%eax
  shl    $0x6,%eax
  cltq
  and    $0xfc0,%eax
  or     %rax,-0x18(%rbp)
  movl   $0x1,-0x24(%rbp)
  jmp    L294
L242:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  movl   $0x0,-0x24(%rbp)
  jmp    L294
  mov    -0x1c(%rbp),%eax
  and    $0xc0,%eax
  cmp    $0x80,%eax
  jne    L121
  mov    -0x1c(%rbp),%eax
  shl    $0xc,%eax
  cltq
  and    $0x3f000,%eax
  or     %rax,-0x18(%rbp)
  movl   $0x2,-0x24(%rbp)
  jmp    L294
L121:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  movl   $0x0,-0x24(%rbp)
  jmp    L294
  mov    -0x1c(%rbp),%eax
  and    $0xc0,%eax
  cmp    $0x80,%eax
  jne    L429
  mov    -0x1c(%rbp),%eax
  shl    $0x12,%eax
  cltq
  and    $0xfc0000,%eax
  or     %rax,-0x18(%rbp)
  movl   $0x3,-0x24(%rbp)
  jmp    L294
L429:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  movl   $0x0,-0x24(%rbp)
  jmp    L294
  mov    -0x1c(%rbp),%eax
  and    $0xc0,%eax
  cmp    $0x80,%eax
  jne    L514
  mov    -0x1c(%rbp),%eax
  shl    $0x18,%eax
  cltq
  and    $0x3f000000,%eax
  or     %rax,-0x18(%rbp)
  movl   $0x4,-0x24(%rbp)
  jmp    L294
L514:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  movl   $0x0,-0x24(%rbp)
  jmp    L294
L577:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  movl   $0x0,-0x24(%rbp)
  jmp    L294
L354:
  nop
L294:
  cmpl   $0x0,-0x24(%rbp)
  jne    L68
  cmpl   $0x6,-0x20(%rbp)
  ja     L24
  mov    -0x20(%rbp),%eax
  lea    0x0(,%rax,4),%rdx
  lea    D28(%rip),%rax
  mov    (%rdx,%rax,1),%eax
  cltq
  lea    D28(%rip),%rdx
  add    %rdx,%rax
  notrack jmp *%rax
  cmpq   $0x7f,-0x18(%rbp)
  jbe    L344
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  jmp    L344
  cmpq   $0x7f,-0x18(%rbp)
  jbe    L527
  cmpq   $0x7ff,-0x18(%rbp)
  jbe    L411
L527:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  jmp    L411
  cmpq   $0x7ff,-0x18(%rbp)
  jbe    L276
  cmpq   $0xffff,-0x18(%rbp)
  jbe    L445
L276:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  jmp    L445
  cmpq   $0xffff,-0x18(%rbp)
  jbe    L238
  cmpq   $0x1fffff,-0x18(%rbp)
  jbe    L86
L238:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  jmp    L86
  cmpq   $0x1fffff,-0x18(%rbp)
  jbe    L74
  cmpq   $0x3ffffff,-0x18(%rbp)
  jbe    L423
L74:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  jmp    L423
  cmpq   $0x3ffffff,-0x18(%rbp)
  jbe    L319
  mov    $0x80000000,%eax
  cmp    %rax,-0x18(%rbp)
  jb     L542
L319:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  jmp    L542
L24:
  mov    $0xffffffff,%eax
  mov    %rax,-0x18(%rbp)
  jmp    L389
L344:
  nop
  jmp    L389
L411:
  nop
  jmp    L389
L445:
  nop
  jmp    L389
L86:
  nop
  jmp    L389
L423:
  nop
  jmp    L389
L542:
  nop
L389:
  mov    $0xffffffff,%eax
  cmp    %rax,-0x18(%rbp)
  je     L68
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x10(%rbp)
  mov    -0x18(%rbp),%rdx
  mov    %dl,(%rax)
L68:
  mov    -0x38(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x38(%rbp)
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  jne    L306
  mov    -0x10(%rbp),%rax
  movb   $0x0,(%rax)
  mov    -0x8(%rbp),%rax
  leave
  ret
```

assistant: ```c
char *cmyth_utf8tolatin1(char *s) {
  unsigned long ucs4;
  int c, state, octets;
  char *out, *t;
  ucs4 = 0;
  state = 0;
  octets = 0;
  out = (char *)(__ref_alloc((strlen(s) + 1), (char *)0, (char *)0, 0));
  t = out;
  *t = 0;
  while ((c = *(s++)) != 0) {
    switch (state) {
    case 0:
      ucs4 = 0;
      if ((c & 0xfe) == 0xfc) {
        ucs4 = (c & 0x01) << 30;
        octets = 6;
        state = 5;
      } else if ((c & 0xfc) == 0xf8) {
        ucs4 = (c & 0x03) << 24;
        octets = 5;
        state = 4;
      } else if ((c & 0xf8) == 0xf0) {
        ucs4 = (c & 0x07) << 18;
        octets = 4;
        state = 3;
      } else if ((c & 0xf0) == 0xe0) {
        ucs4 = (c & 0x0f) << 12;
        octets = 3;
        state = 2;
      } else if ((c & 0xe0) == 0xc0) {
        ucs4 = (c & 0x1f) << 6;
        octets = 2;
        state = 1;
      } else if ((c & 0x80) == 0x00) {
        ucs4 = (c & 0x7f);
        octets = 1;
        state = 0;
      } else {
        ;
      }
      break;
    case 1:
      if ((c & 0xc0) == 0x80) {
        ucs4 = ucs4 | (c & 0x3f);
        if (ucs4 < 0x80 || ucs4 > 0x7ff) {
          ucs4 = 0xffffffff;
        }
      } else {
        ucs4 = 0xffffffff;
      }
      state = 0;
      break;
    case 2:
      if ((c & 0xc0) == 0x80) {
        ucs4 = ucs4 | ((c & 0x3f) << 6);
        state = 1;
      } else {
        ucs4 = 0xffffffff;
        state = 0;
      }
      break;
    case 3:
      if ((c & 0xc0) == 0x80) {
        ucs4 = ucs4 | ((c & 0x3f) << 12);
        state = 2;
      } else {
        ucs4 = 0xffffffff;
        state = 0;
      }
      break;
    case 4:
      if ((c & 0xc0) == 0x80) {
        ucs4 = ucs4 | ((c & 0x3f) << 18);
        state = 3;
      } else {
        ucs4 = 0xffffffff;
        state = 0;
      }
      break;
    case 5:
      if ((c & 0xc0) == 0x80) {
        ucs4 = ucs4 | ((c & 0x3f) << 24);
        state = 4;
      } else {
        ucs4 = 0xffffffff;
        state = 0;
      }
      break;
    default:
      ucs4 = 0xffffffff;
      state = 0;
      break;
    }
    if (state == 0) {
      switch (octets) {
      case 1:
        if (ucs4 > 0x7f)
          ucs4 = 0xffffffff;
        break;
      case 2:
        if (ucs4 < 0x80 || ucs4 > 0x7ff)
          ucs4 = 0xffffffff;
        break;
      case 3:
        if (ucs4 < 0x800 || ucs4 > 0xffff)
          ucs4 = 0xffffffff;
        break;
      case 4:
        if (ucs4 < 0x10000 || ucs4 > 0x1fffff)
          ucs4 = 0xffffffff;
        break;
      case 5:
        if (ucs4 < 0x200000 || ucs4 > 0x3ffffff)
          ucs4 = 0xffffffff;
        break;
      case 6:
        if (ucs4 < 0x4000000 || ucs4 > 0x7fffffff)
          ucs4 = 0xffffffff;
        break;
      default:
        ucs4 = 0xffffffff;
        break;
      }
      if (ucs4 != 0xffffffff) {
        *(t++) = (char)ucs4;
      }
    }
  }
  *t = 0;
  return out;
}
```