// 
// __crt_mbstring::__mbrtoc32_utf8 from 0x180141250 to 0x180141425 (469 bytes)
// 
// 4 xrefs:
// > __crt_mbstring::__mbrtowc_utf8 @ 0x18013da7e
// > __crt_mbstring::__mbsrtowcs_utf8 @ 0x18013db1f
// > __crt_mbstring::__mbsrtowcs_utf8 @ 0x18013dc01
// > <???> @ 0x180203c98
// 
// This function is hookable on this platform!
// 
// Using BromaIDA 8.0.0 @ https://github.com/Stazzical/BromaIDA
// Using bindings at commit ba9f177b at Thu Jul 16 22:52:06 2026 from https://github.com/geode-sdk/bindings
// 

unsigned __int64 __fastcall __crt_mbstring::__mbrtoc32_utf8(
        unsigned __int64 this,
        char32_t *a2,
        const char *a3,
        void *a4)
{
  __int64 v4; // r10
  void *v5; // r11
  const char *v6; // rdi
  unsigned __int64 v8; // r14
  _DWORD *v9; // rsi
  int v11; // r9d
  unsigned __int8 v12; // r8
  unsigned __int8 v13; // bl
  unsigned int v14; // edx
  unsigned __int64 v15; // r9
  char v16; // cl
  _DWORD v17[6]; // [rsp+18h] [rbp-50h]

  v4 = 0;
  v5 = &unk_1801F5730;
  v6 = &byte_18014572F;
  if ( a4 )
    v5 = a4;
  if ( a2 )
    v6 = (const char *)a2;
  v8 = 1;
  if ( a2 )
    v8 = (unsigned __int64)a3;
  v9 = (_DWORD *)(this & -(__int64)(a2 != nullptr));
  if ( !v8 )
    return -2;
  if ( !*((_WORD *)v5 + 3) )
  {
    v11 = *(unsigned __int8 *)v6++;
    if ( (v11 & 0x80u) == 0 )
    {
      if ( v9 )
        *v9 = v11;
      LOBYTE(v4) = (_BYTE)v11 != 0;
      return v4;
    }
    if ( (v11 & 0xE0) == 0xC0 )
    {
      v12 = 2;
LABEL_20:
      v13 = v12;
      v14 = v11 & ((1 << (7 - v12)) - 1);
      goto LABEL_24;
    }
    if ( (v11 & 0xF0) == 0xE0 )
    {
      v12 = 3;
      goto LABEL_20;
    }
    if ( (v11 & 0xF8) == 0xF0 )
    {
      v12 = 4;
      goto LABEL_20;
    }
LABEL_38:
    *(_QWORD *)v5 = 0;
    *errno() = 42;
    return -1;
  }
  v12 = *((_BYTE *)v5 + 4);
  v14 = *(_DWORD *)v5;
  v13 = *((_BYTE *)v5 + 6);
  if ( (unsigned __int8)(v12 - 2) > 2u || !v13 || v13 >= v12 )
    goto LABEL_38;
LABEL_24:
  v15 = v13;
  if ( v13 >= v8 )
    v15 = v8;
  while ( v6 - (const char *)a2 < v15 )
  {
    v16 = *v6++;
    if ( (v16 & 0xC0) != 0x80 )
      goto LABEL_38;
    v14 = (v14 << 6) | v16 & 0x3F;
  }
  if ( v15 < v13 )
  {
    *((_WORD *)v5 + 2) = v12;
    *((_WORD *)v5 + 3) = (unsigned __int8)(v13 - v15);
    *(_DWORD *)v5 = v14;
    return -2;
  }
  if ( v14 - 55296 <= 0x7FF )
    goto LABEL_38;
  if ( v14 >= 0x110000 )
    goto LABEL_38;
  v17[2] = 128;
  v17[3] = 2048;
  v17[4] = 0x10000;
  if ( v14 < v17[v12] )
    goto LABEL_38;
  if ( v9 )
    *v9 = v14;
  *(_QWORD *)v5 = 0;
  return v13 & (unsigned __int64)-(__int64)(v14 != 0);
}