// 
// __crt_mbstring::__wcsrtombs_utf8 from 0x180137108 to 0x180137223 (283 bytes)
// 
// 2 xrefs:
// > _wcstombs_l_helper @ 0x18012b530
// > <???> @ 0x1802035b4
// 
// 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::__wcsrtombs_utf8(
        __crt_mbstring *this,
        char *a2,
        const wchar_t **a3,
        struct _Mbstatet *a4)
{
  unsigned __int16 *v4; // rsi
  char16_t v5; // bp
  __crt_mbstring *v9; // rbx
  unsigned __int16 *v10; // rdi
  __crt_mbstring *v11; // r12
  size_t v12; // rax
  size_t v13; // rbp
  unsigned __int64 result; // rax
  __int64 v15; // rbx
  struct _Mbstatet *v16; // [rsp+20h] [rbp-58h]
  _BYTE v17[8]; // [rsp+28h] [rbp-50h] BYREF

  v4 = *(unsigned __int16 **)a2;
  v5 = (unsigned __int16)a4;
  v16 = a4;
  if ( this )
  {
    v9 = this;
    v10 = v4;
    while ( 1 )
    {
      v11 = (__crt_mbstring *)v17;
      if ( (unsigned __int64)a3 >= 4 )
        v11 = v9;
      v12 = __crt_mbstring::__c16rtomb_utf8(v11, (char *)*v4, v5, a4);
      v13 = v12;
      if ( v12 == -1 )
        break;
      if ( v11 != v9 )
      {
        if ( (unsigned __int64)a3 < v12 )
          goto LABEL_15;
        memmove(v9, v11, v12);
      }
      if ( v13 && !*((_BYTE *)v9 + v13 - 1) )
      {
        v10 = nullptr;
        v9 = (__crt_mbstring *)((char *)v9 + v13 - 1);
LABEL_15:
        *(_QWORD *)a2 = v10;
        return v9 - this;
      }
      ++v4;
      if ( v13 )
        v10 = v4;
      a3 = (const wchar_t **)((char *)a3 - v13);
      v9 = (__crt_mbstring *)((char *)v9 + v13);
      v5 = (unsigned __int16)v16;
    }
    *(_QWORD *)a2 = v10;
    return -1;
  }
  else
  {
    v15 = 0;
    while ( 1 )
    {
      result = __crt_mbstring::__c16rtomb_utf8((__crt_mbstring *)v17, (char *)*v4, v5, a4);
      if ( result == -1 )
        break;
      if ( result && !v17[result - 1] )
        return v15 + result - 1;
      v15 += result;
      ++v4;
    }
  }
  return result;
}