source: contrib/installer/uninstall/reshlp.cpp

/*
   for the syntax of DLL CARDINFO.DLL, see:
   "MMPM/2 Device Driver Reference"
      ->Adding Support for Audio and Video Adapters
      ->Audio Adapter Installation
      ->Step 3: Modifying the CARDINFO.RC File
*/
#include "reshlp.h"

APIRET OpenResourceDLL(PHMODULE phmod)
{
   APIRET rc = NO_ERROR;
   if (!phmod)
   {
      return ERROR_INVALID_PARAMETER;
   }
   rc = DosLoadModule(NULL,0UL,"CARDINFO",phmod);
   if (rc)
   {
      *phmod = NULLHANDLE;
   }
   return rc;
}

APIRET CloseResourceDLL(HMODULE hmod)
{
   APIRET rc = NO_ERROR;
   if (hmod)
   {
      rc = DosFreeModule(hmod);
   }
   return rc;
}

APIRET QueryNumberAdapters(HMODULE hmod,PULONG pulNum)
{
   PVOID pStr;
   APIRET rc = NO_ERROR;
   if (!pulNum)
   {
      return ERROR_INVALID_PARAMETER;
   }
   rc = DosGetResource(hmod,RT_RCDATA,1UL,&pStr);
   if (rc)
   {
      *pulNum = 0UL;
   }
   else
   {
      *pulNum = strtoul((PSZ)pStr,NULL,10);
      rc = DosFreeResource(pStr);
   }
   return rc;
}

APIRET QueryAdapterID(HMODULE hmod,ULONG ulAdapterIdx,PULONG pulID)
{
   PVOID pStr;
   APIRET rc = NO_ERROR;
   if (!pulID)
   {
      return ERROR_INVALID_PARAMETER;
   }
   rc = DosGetResource(hmod,RT_RCDATA,(ulAdapterIdx+1)*10UL,&pStr);
   if (rc)
   {
      *pulID = 0UL;
   }
   else
   {
      *pulID = strtoul((PSZ)pStr,NULL,10);
      rc = DosFreeResource(pStr);
   }
   return rc;
}

APIRET QueryNumberOfDrivers(HMODULE hmod,ULONG ulAdapterIdx,PULONG pulDrivers)
{
   PVOID pStr;
   APIRET rc = NO_ERROR;
   if (!pulDrivers)
   {
      return ERROR_INVALID_PARAMETER;
   }
   rc = DosGetResource(hmod,RT_RCDATA,(ulAdapterIdx+1)*10UL+1UL,&pStr);
   if (rc)
   {
      *pulDrivers = 0UL;
   }
   else
   {
      ULONG i;
      PSZ pTemp = (PSZ)pStr;
      /* skip:
         1.) max num adapters
         2.) name of help file
         3.) name of custom audio installation dll
         4.) name of custom audio installation dll entry point
      */
      for(i=0;i<4;i++)
      {
         pTemp += strlen(pTemp)+sizeof(CHAR);
      }
      /*
         Number of config.sys lines in i
      */
      i = strtoul(pTemp,NULL,10);
      /*
         skip the config.sys lines
      */
      do
      {
         pTemp += strlen(pTemp)+sizeof(CHAR);
      }
      while(i--);
      /*
         Now we get the number of drivers defined
      */
      *pulDrivers = strtoul(pTemp,NULL,10);
      rc = DosFreeResource(pStr);
   }
   return rc;
}

APIRET QueryNumberOfConfigStrings(HMODULE hmod,ULONG ulAdapterIdx,PULONG pulNum)
{
   PVOID pStr;
   APIRET rc = NO_ERROR;
   if (!pulNum)
   {
      return ERROR_INVALID_PARAMETER;
   }
   rc = DosGetResource(hmod,RT_RCDATA,(ulAdapterIdx+1)*10UL+1UL,&pStr);
   if (rc)
   {
      *pulNum = 0UL;
   }
   else
   {
      ULONG i;
      PSZ pTemp = (PSZ)pStr;
      /* skip:
         1.) max num adapters
         2.) name of help file
         3.) name of custom audio installation dll
         4.) name of custom audio installation dll entry point
      */
      for(i=0;i<4;i++)
      {
         pTemp += strlen(pTemp)+sizeof(CHAR);
      }
      /*
         Now we get the number of config.sys lines
      */
      *pulNum = strtoul(pTemp,NULL,10);
      rc = DosFreeResource(pStr);
   }
   return rc;
}

APIRET QueryConfigString(HMODULE hmod,ULONG ulAdapterIdx,ULONG ulConfigIdx,PSZ pszString)
{
   PVOID pStr;
   APIRET rc = NO_ERROR;
   if (!pszString)
   {
      return ERROR_INVALID_PARAMETER;
   }
   rc = DosGetResource(hmod,RT_RCDATA,(ulAdapterIdx+1)*10UL+1UL,&pStr);
   if (rc)
   {
      *pszString = '\0';
   }
   else
   {
      ULONG i;
      PSZ pTemp = (PSZ)pStr;
      /* skip:
         1.) max num adapters
         2.) name of help file
         3.) name of custom audio installation dll
         4.) name of custom audio installation dll entry point
         5.) number of config.sys lines
      */
      for(i=0;i<5;i++)
      {
         pTemp += strlen(pTemp)+sizeof(CHAR);
      }
      /*
         advance to the config.sys line we are looking for
      */
      while(ulConfigIdx--)
      {
         pTemp += strlen(pTemp)+sizeof(CHAR);
      }
      /*
         get the config.sys line
      */
      strcpy(pszString,pTemp);
      rc = DosFreeResource(pStr);
    }
    return rc;
}




APIRET QueryDriverInstallNameAndType(HMODULE hmod,ULONG ulAdapterIdx,ULONG ulDriverIdx,PSZ pszName,PULONG pulDevType)
{
   PVOID pStr;
   APIRET rc = NO_ERROR;
   if (!pszName || !pulDevType)
   {
      return ERROR_INVALID_PARAMETER;
   }
   rc = DosGetResource(hmod,RT_RCDATA,(ulAdapterIdx+1)*10UL+(ulDriverIdx+1)+1UL,&pStr);
   if (rc)
   {
      *pszName = '\0';
      *pulDevType = 0UL;
   }
   else
   {
      PSZ pTemp = (PSZ)pStr;
      /*
         first string is install name
      */
      strcpy(pszName,pTemp);
      pTemp += strlen(pTemp)+sizeof(CHAR);
      /*
         second string is device type
      */
      *pulDevType = strtoul(pTemp,NULL,10);
      rc = DosFreeResource(pStr);
   }
   return rc;
}