/****************************************************************************
*
* initc.c
*
* Copyright (c) 1991-1992 Microsoft Corporation. All Rights Reserved.
*
***************************************************************************/
#include <windows.h>
#include <mmsystem.h>
#include <mmddk.h>
#define NOSTR /* to avoid redefining strings */
#include "sndblst.h"
#define DEF_MIDIINPERSISTENCE 50 /* default MIDI in persistence factor */
/*****************************************************************************
internal function prototypes
****************************************************************************/
static WORD NEAR PASCAL GetProfileHex(LPSTR szApp, LPSTR szEntry, WORD wDef);
/****************************************************************************
strings
most strings are only accessed at init time, so they will be placed
in the _INIT code segment.
***************************************************************************/
#define BCODE _based(_segname("_CODE"))
#define BDATA _based(_segname("_DATA"))
/* non-localized strings */
char BCODE STR_PORT[] = "port";
char BCODE STR_INT[] = "int";
char BCODE STR_DRIVERNAME[] = "sndblst.drv";
char BCODE STR_INIFILE[] = "system.ini";
char BCODE STR_PRODUCTNAME[] = "Sound Blaster";
static char BCODE STR_NULL[] = "";
static char BCODE STR_DMACHANNEL[] = "dmachannel";
static char BCODE STR_PERSISTENCE[] = "midiinpersistence";
static char BCODE STR_NOWARNING[] = "nowarning";
static char BCODE STR_VERIFYINT[] = "verifyint";
static char BCODE STR_EVILTWIN[] = "SNDBLST1";
#ifdef DEBUG
static char BCODE STR_SNDBLST[] = "sndblst";
static char BCODE STR_MMDEBUG[] = "mmdebug";
/* these strings are accessed at interrupt time, so they must be in */
/* the fixed DS */
char BDATA STR_CRLF[] = "\r\nSNDBLST: ";
char BDATA STR_SPACE[] = " ";
#endif
/****************************************************************************
public data
***************************************************************************/
HANDLE ghModule = NULL; /* our module handle */
WORD gwErrorStringId = 0; /* if initialization fails, string id */
BYTE gfVerifyInt = FALSE;
#ifdef DEBUG
WORD wDebugLevel = 0; /* debug level */
#endif
/***************************************************************************
* @doc INTERNAL
*
* @api WORD | GetProfileHex | Get a profile hex value.
*
* @parm LPSTR | szAppName | The app name.
*
* @parm LPSTR | szEntry | The entry name.
*
* @parm WORD | wDefault | The default value.
*
* @rdesc Returns the profile value or the default if none is present.
***************************************************************************/
static WORD NEAR PASCAL GetProfileHex(LPSTR szApp, LPSTR szEntry, WORD wDef)
{
BYTE buf[20];
WORD n;
BYTE b;
int i;
n = GetPrivateProfileString(szApp, szEntry, STR_NULL, buf, sizeof(buf), STR_INIFILE);
if (n < 1) return wDef;
for (n = 0, i = 0; b = buf[i]; i++) {
if (b > 'Z') b -= 'a' - 'A';
b -= '0';
if (b > 9) b -= 7;
if (b > 15)
break;
n = n * 16 + b;
}
return n;
}
/***************************************************************************
* @doc INTERNAL
*
* @api WORD | ConfigGetPortBase |
*
* @rdesc Returns the port base from SYSTEM.INI
***************************************************************************/
WORD NEAR PASCAL ConfigGetPortBase(void)
{
WORD wPort;
/* read szIniFile and get the board configuration information. */
wPort = GetProfileHex(STR_DRIVERNAME, STR_PORT, -1);
switch (wPort) {
case 0x200:
case 0x210:
case 0x220:
case 0x230:
case 0x240:
case 0x250:
case 0x260:
case 0x270:
break;
default:
wPort = -1;
D1("driver PORT not configured");
}
return (wPort);
}
/***************************************************************************
* @doc INTERNAL
*
* @api WORD | ConfigGetIRQ |
*
* @rdesc Returns the IRQ ('int') from SYSTEM.INI
***************************************************************************/
BYTE NEAR PASCAL ConfigGetIRQ(void)
{
BYTE bInt;
bInt = (BYTE)GetPrivateProfileInt(STR_DRIVERNAME, STR_INT, -1, STR_INIFILE);
switch (bInt) {
case 3:
case 5:
case 7:
case 9:
case 10:
break;
case 2:
bInt = 9;
break;
default:
bInt = -1;
D1("driver INT not configured");
break;
}
return (bInt);
}
/***************************************************************************
* @doc INTERNAL
*
* @api WORD | ConfigGetDMAChannel |
*
* @rdesc Returns the DMA channel from SYSTEM.INI
***************************************************************************/
BYTE NEAR PASCAL ConfigGetDMAChannel(void)
{
BYTE bDMAChannel;
/* get the DMA channel that the card is using... */
bDMAChannel = (BYTE)GetPrivateProfileInt(STR_DRIVERNAME, STR_DMACHANNEL,
-1, STR_INIFILE);
switch (bDMAChannel) {
case 0:
case 1:
case 3:
break;
default:
bDMAChannel = 1;
}
return (bDMAChannel);
}
/***************************************************************************/
static WORD NEAR PASCAL GetWindowsVersionCorrectly()
{
WORD w;
w = LOWORD(GetVersion());
return (w << 8) | (w >> 8);
}
/***************************************************************************/
static void NEAR PASCAL HardErrorMsgBox(WORD wStringId)
{
char szErrorBuffer[MAX_ERR_STRING]; /* buffer for error messages */
/* Starting with Windows 3.1, it is ok to bring up a _hard system modal_ */
/* message box during LibInit. In Windows 3.0, this will not work! */
if (GetWindowsVersionCorrectly() >= 0x30A) {
LoadString(ghModule, wStringId, szErrorBuffer, sizeof(szErrorBuffer));
MessageBox(NULL, szErrorBuffer, STR_PRODUCTNAME, MB_OK|MB_SYSTEMMODAL|MB_ICONHAND);
}
}
BOOL FAR PASCAL InitDisplayConfigErrors(void)
{
char szErrorBuffer[MAX_ERR_STRING]; /* buffer for error messages */
if (gwErrorStringId) {
LoadString(ghModule, gwErrorStringId, szErrorBuffer, sizeof(szErrorBuffer));
MessageBox(NULL, szErrorBuffer, STR_PRODUCTNAME, MB_OK|MB_SYSTEMMODAL|MB_ICONHAND);
gwErrorStringId = 0;
}
return TRUE;
}
/****************************************************************************
* @doc INTERNAL
*
* @api int | LibMain | Library initialization code.
*
* @parm HANDLE | hModule | Our module handle.
*
* @parm WORD | wHeapSize | The heap size from the .def file.
*
* @parm LPSTR | lpCmdLine | The command line.
*
* @rdesc Returns 1 if the initialization was successful and 0 otherwise.
***************************************************************************/
int NEAR PASCAL LibMain(HANDLE hModule, WORD wHeapSize, LPSTR lpCmdLine)
{
WORD wPort;
BYTE bInt;
BYTE bDMAChannel;
WORD wMidiInPersistence;
WORD wError;
DWORD dw;
#ifdef DEBUG
/* get debug level - default is 0 */
wDebugLevel = GetProfileInt(STR_MMDEBUG, STR_SNDBLST, 0);
#endif
D1("LibMain");
/* save our module handle */
ghModule = hModule;
/* we have a good chance of hanging if two sound blaster drivers are */
/* enabled */
if (GetModuleHandle(STR_EVILTWIN)) {
D1("EVIL TWIN SNDBLST1 LOCATED!! WE WILL NOT ENABLE!!!");
wError = IDS_ERRTWODRIVERS;
goto libmain_Severe_Error;
}
/* do preliminary stuff--and check for hardware problems... */
if (wError = InitPreliminary())
goto libmain_Severe_Error;
/* get the DMA channel that the card is using... */
wPort = ConfigGetPortBase();
bInt = ConfigGetIRQ();
bDMAChannel = ConfigGetDMAChannel();
/* over-ride switch in case someone has problems... */
gfVerifyInt = (BYTE)GetPrivateProfileInt(STR_DRIVERNAME, STR_VERIFYINT, 1, STR_INIFILE);
/* verify port, IRQ, DMA channel and DSP version
*
* The return value is:
* LOWORD() = error code. it is 0 if no error, otherwise it is
* the IDS_xxxxxx error define (and hi-word will be
* zero).
* HIWORD() = DSP version.
*/
dw = InitVerifyConfiguration(wPort, bInt, bDMAChannel);
/* was there an error? */
if (LOWORD(dw)) {
/* display error, but allow load to succeed. we will NOT enable,
* but we need to allow someone to configure us in the drivers applet.
*/
gwErrorStringId = IDS_ERRBADCONFIG;
return 1;
}
/* iff the DSP version is too old, then do NOT load driver! otherwise */
/* let it be loaded so it can be configured (but not enabled). */
wError = HIWORD(dw);
if (wError < DSP_VERSION_REQD) {
wError = IDS_ERRBADVERSION;
libmain_Severe_Error:
/* display error and FAIL to load... */
HardErrorMsgBox(wError);
return 0;
}
/* get MIDI input persistence... */
wMidiInPersistence = GetPrivateProfileInt(STR_DRIVERNAME, STR_PERSISTENCE,
DEF_MIDIINPERSISTENCE, STR_INIFILE);
/* set the configuration */
InitSetConfiguration(wPort, bInt, bDMAChannel, wMidiInPersistence);
/* load driver (but maybe not enable if configuration is wrong). */
return 1;
}
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