// 
// _setmbcp_nolock from 0x18013a890 to 0x18013ab49 (697 bytes)
// 
// 3 xrefs:
// > setmbcp_internal @ 0x18013a67a
// > <???> @ 0x180203884
// > <???> @ 0x180203890
// 
// 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
// 

__int64 __fastcall setmbcp_nolock(UINT a1, __int64 a2)
{
  const wchar_t *v3; // rbx
  UINT SystemCP; // edi
  unsigned int v5; // r14d
  _DWORD *v6; // rax
  int v7; // ebp
  _WORD *v8; // rdi
  __int64 j; // rcx
  bool v10; // zf
  BYTE *i; // rcx
  unsigned int v12; // eax
  unsigned int v13; // edx
  __int64 v14; // rdi
  __int64 v15; // rdx
  _BYTE *v16; // rax
  __int64 v17; // rcx
  const wchar_t *v18; // rax
  __int64 v20; // rax
  _BYTE *v21; // r15
  __int64 v22; // r14
  char *v23; // r9
  unsigned __int8 *v24; // rdx
  unsigned int v25; // r8d
  __int64 v26; // r10
  UINT v27; // edi
  UINT v28; // edi
  UINT v29; // edi
  _WORD *v30; // rdx
  __int64 v31; // rcx
  struct _cpinfo CPInfo; // [rsp+20h] [rbp-58h] BYREF

  v3 = nullptr;
  SystemCP = getSystemCP(a1);
  if ( SystemCP )
  {
    v5 = 0;
    v6 = &unk_1801B1EA0;
    v7 = 1;
    do
    {
      if ( *v6 == SystemCP )
      {
        memset((void *)(a2 + 24), 0, 0x101u);
        v20 = v5;
        v21 = &unk_1801B1E90;
        v22 = 4;
        v23 = (char *)&unk_1801B1EB0 + 48 * v20;
        do
        {
          v24 = (unsigned __int8 *)v23;
          if ( *v23 )
          {
            do
            {
              if ( !v24[1] )
                break;
              v25 = *v24;
              if ( v25 <= v24[1] )
              {
                v26 = v25 + 1;
                do
                {
                  if ( (unsigned int)v26 >= 0x101 )
                    break;
                  ++v25;
                  *(_BYTE *)(v26 + a2 + 24) |= *v21;
                  v26 = (unsigned int)(v26 + 1);
                }
                while ( v25 <= v24[1] );
              }
              v24 += 2;
            }
            while ( *v24 );
          }
          v23 += 8;
          ++v21;
          --v22;
        }
        while ( v22 );
        *(_DWORD *)(a2 + 4) = SystemCP;
        *(_DWORD *)(a2 + 8) = 1;
        v27 = SystemCP - 932;
        if ( v27 )
        {
          v28 = v27 - 4;
          if ( v28 )
          {
            v29 = v28 - 13;
            if ( v29 )
            {
              if ( v29 == 1 )
                v3 = L"zh-TW";
            }
            else
            {
              v3 = L"ko-KR";
            }
          }
          else
          {
            v3 = L"zh-CN";
          }
        }
        else
        {
          v3 = L"ja-JP";
        }
        *(_QWORD *)(a2 + 544) = v3;
        v30 = (_WORD *)(a2 + 12);
        v31 = 6;
        do
        {
          *v30 = *(_WORD *)((char *)v30 + (_QWORD)&unk_1801B1EA0 + 48 * v20 - a2 - 8);
          ++v30;
          --v31;
        }
        while ( v31 );
        goto LABEL_12;
      }
      ++v5;
      v6 += 12;
    }
    while ( v5 < 5 );
    if ( SystemCP == 65000 || !IsValidCodePage((unsigned __int16)SystemCP) )
      return 0xFFFFFFFFLL;
    if ( SystemCP == 65001 )
    {
      *(_QWORD *)(a2 + 4) = 65001;
      *(_QWORD *)(a2 + 544) = 0;
      *(_DWORD *)(a2 + 24) = 0;
      *(_WORD *)(a2 + 28) = 0;
      goto LABEL_9;
    }
    if ( GetCPInfo(SystemCP, &CPInfo) )
    {
      memset((void *)(a2 + 24), 0, 0x101u);
      v10 = CPInfo.MaxCharSize == 2;
      *(_DWORD *)(a2 + 4) = SystemCP;
      *(_QWORD *)(a2 + 544) = 0;
      if ( v10 )
      {
        for ( i = CPInfo.LeadByte; *i; i += 2 )
        {
          if ( !i[1] )
            break;
          v12 = i[1];
          v13 = *i;
          if ( v13 <= v12 )
          {
            v14 = v13 + 1;
            v15 = v12 - v13 + 1;
            do
            {
              *(_BYTE *)(v14 + a2 + 24) |= 4u;
              v14 = (unsigned int)(v14 + 1);
              --v15;
            }
            while ( v15 );
          }
        }
        v16 = (_BYTE *)(a2 + 26);
        v17 = 254;
        do
        {
          *v16++ |= 8u;
          --v17;
        }
        while ( v17 );
        switch ( *(_DWORD *)(a2 + 4) )
        {
          case 0x3A4:
            v18 = L"ja-JP";
            break;
          case 0x3A8:
            v18 = L"zh-CN";
            break;
          case 0x3B5:
            v18 = L"ko-KR";
            break;
          case 0x3B6:
            v18 = L"zh-TW";
            break;
          default:
            v18 = nullptr;
            break;
        }
        *(_QWORD *)(a2 + 544) = v18;
      }
      else
      {
        v7 = 0;
      }
      *(_DWORD *)(a2 + 8) = v7;
LABEL_9:
      v8 = (_WORD *)(a2 + 12);
      for ( j = 6; j; --j )
        *v8++ = 0;
LABEL_12:
      setSBUpLow((struct __crt_multibyte_data *)a2);
      return 0;
    }
    if ( !dword_1801F55D8 )
      return 0xFFFFFFFFLL;
  }
  setSBCS((struct threadmbcinfostruct *)a2);
  return 0;
}