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

```asm
<Tcl_ConvertElement>:
  endbr64
  mov    %edx,%eax
  mov    %rsi,%r8
  and    $0x3,%eax
  cmp    $0x2,%eax
  je     L81
  movzbl (%rdi),%ecx
  test   %cl,%cl
  je     L6
  mov    %rsi,%rax
  and    $0x4,%edx
  mov    $0x1,%r10d
  movabs $0x800001500000000,%r9
  jmp    L68
  nopl   0x0(%rax,%rax,1)
L150:
  cmp    $0xa,%cl
  je     L3
  cmp    $0xb,%cl
  jne    L115
  mov    $0x765c,%ecx
  add    $0x2,%rax
  mov    %cx,-0x2(%rax)
L218:
  movzbl 0x1(%rdi),%ecx
  add    $0x1,%rdi
  test   %cl,%cl
  je     L250
L68:
  cmp    $0x3b,%cl
  jg     L25
  cmp    $0xb,%cl
  jle    L150
  mov    %r10,%rsi
  shl    %cl,%rsi
  test   %r9,%rsi
  jne    L37
  cmp    $0xd,%cl
  je     L80
  cmp    $0xc,%cl
  je     L87
L251:
  movzbl (%rdi),%ecx
  add    $0x1,%rdi
  add    $0x1,%rax
  mov    %cl,-0x1(%rax)
  movzbl (%rdi),%ecx
  test   %cl,%cl
  jne    L68
L250:
  mov    %eax,%r9d
  movb   $0x0,(%rax)
  sub    %r8d,%r9d
  mov    %r9d,%eax
  ret
  nopl   0x0(%rax,%rax,1)
L6:
  lea    0x2(%rsi),%rax
  mov    $0x305c,%edi
  mov    $0x2,%r9d
  mov    %di,(%rsi)
  movb   $0x0,(%rax)
  mov    %r9d,%eax
  ret
  nopl   0x0(%rax)
L25:
  cmp    $0x7b,%cl
  je     L77
  jle    L201
  cmp    $0x7d,%cl
  jne    L251
L77:
  test   %edx,%edx
  je     L251
  movb   $0x5c,(%rax)
  add    $0x1,%rax
  jmp    L251
  nopl   0x0(%rax)
L115:
  cmp    $0x9,%cl
  jne    L251
  mov    $0x745c,%esi
  add    $0x2,%rax
  mov    %si,-0x2(%rax)
  jmp    L218
L201:
  sub    $0x5b,%ecx
  cmp    $0x2,%cl
  ja     L251
L37:
  movb   $0x5c,(%rax)
  add    $0x1,%rax
  jmp    L251
  nop
L81:
  movb   $0x7b,(%rsi)
  movzbl (%rdi),%edx
  lea    0x1(%rsi),%rax
  test   %dl,%dl
  je     L100
  xchg   %ax,%ax
L175:
  add    $0x1,%rdi
  mov    %dl,(%rax)
  add    $0x1,%rax
  movzbl (%rdi),%edx
  test   %dl,%dl
  jne    L175
L100:
  movb   $0x7d,(%rax)
  add    $0x1,%rax
  mov    %eax,%r9d
  sub    %r8d,%r9d
  movb   $0x0,(%rax)
  mov    %r9d,%eax
  ret
  nopl   (%rax)
L3:
  mov    $0x6e5c,%ecx
  add    $0x2,%rax
  mov    %cx,-0x2(%rax)
  jmp    L218
  nopw   0x0(%rax,%rax,1)
L80:
  mov    $0x725c,%r11d
  add    $0x2,%rax
  mov    %r11w,-0x2(%rax)
  jmp    L218
  nopl   0x0(%rax)
L87:
  mov    $0x665c,%esi
  add    $0x2,%rax
  mov    %si,-0x2(%rax)
  jmp    L218
```

assistant: ```c
int Tcl_ConvertElement(src, dst, flags)
register char *src;
char *dst;
int flags;
{
  register char *p = dst;
  if ((flags & 2) && !(flags & 1)) {
    *p = '{';
    p++;
    for (; *src != 0; src++, p++) {
      *p = *src;
    }
    *p = '}';
    p++;
  } else if (*src == 0) {
    p[0] = '\\';
    p[1] = '0';
    p += 2;
  } else {
    for (; *src != 0; src++) {
      switch (*src) {
      case ']':
      case '[':
      case '$':
      case ';':
      case ' ':
      case '\\':
      case '"':
        *p = '\\';
        p++;
        break;
      case '{':
      case '}':
        if (flags & 4) {
          *p = '\\';
          p++;
        }
        break;
      case '\f':
        *p = '\\';
        p++;
        *p = 'f';
        p++;
        continue;
      case '\n':
        *p = '\\';
        p++;
        *p = 'n';
        p++;
        continue;
      case '\r':
        *p = '\\';
        p++;
        *p = 'r';
        p++;
        continue;
      case '\t':
        *p = '\\';
        p++;
        *p = 't';
        p++;
        continue;
      case '\v':
        *p = '\\';
        p++;
        *p = 'v';
        p++;
        continue;
      }
      *p = *src;
      p++;
    }
  }
  *p = '\0';
  return p - dst;
}
```