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 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 #ifndef prwin16_h___

 #define prwin16_h___

 /*

 ** Condition use of this header on platform.

 */

 #if (defined(XP_PC) && !defined(_WIN32) && !defined(XP_OS2) && defined(MOZILLA_CLIENT)) || defined(WIN16)

 #include <stdio.h>

 PR_BEGIN_EXTERN_C

 /* 

 ** Win16 stdio special case.

 ** To get stdio to work for Win16, all calls to printf() and related

 ** things must be called from the environment of the .EXE; calls to

 ** printf() from the .DLL send output to the bit-bucket.

 **

 ** To make sure that PR_fprintf(), and related functions, work correctly,

 ** the actual stream I/O to stdout, stderr, stdin must be done in the

 ** .EXE. To do this, a hack is placed in _MD_Write() such that the

 ** fd for stdio handles results in a call to the .EXE.

 **

 ** file w16stdio.c contains the functions that get called from NSPR

 ** to do the actual I/O. w16stdio.o must be statically linked with

 ** any application needing stdio for Win16.

 **

 ** The address of these functions must be made available to the .DLL

 ** so he can call back to the .EXE. To do this, function 

 ** PR_MD_RegisterW16StdioCallbacks() is called from the .EXE.

 ** The arguments are the functions defined in w16stdio.c

 ** At runtime, MD_Write() calls the registered functions, if any

 ** were registered.

 **

 ** prinit.h contains a macro PR_STDIO_INIT() that calls the registration

 ** function for Win16; For other platforms, the macro is a No-Op.

 **

 ** Note that stdio is not operational at all on Win16 GUI applications.

 ** This special case exists to provide stdio capability from the NSPR

 ** .DLL for command line applications only. NSPR's test cases are

 ** almost exclusively command line applications.

 **

 ** See also: w16io.c, w16stdio.c

 */

 typedef PRInt32 (PR_CALLBACK *PRStdinRead)( void *buf, PRInt32 amount);

 typedef PRInt32 (PR_CALLBACK *PRStdoutWrite)( void *buf, PRInt32 amount);

 typedef PRInt32 (PR_CALLBACK *PRStderrWrite)( void *buf, PRInt32 amount);

 NSPR_API(PRStatus)

 PR_MD_RegisterW16StdioCallbacks( 

     PRStdinRead inReadf,            /* i: function pointer for stdin read       */

     PRStdoutWrite outWritef,        /* i: function pointer for stdout write     */

     PRStderrWrite errWritef         /* i: function pointer for stderr write     */

     );

 NSPR_API(PRInt32)

 _PL_W16StdioWrite( void *buf, PRInt32 amount );

 NSPR_API(PRInt32)

 _PL_W16StdioRead( void *buf, PRInt32 amount );

 #define PR_STDIO_INIT() PR_MD_RegisterW16StdioCallbacks( \

     _PL_W16StdioRead, _PL_W16StdioWrite, _PL_W16StdioWrite ); \

     PR_INIT_CALLBACKS();

 /*

 ** Win16 hackery.

 **

 */

 struct PRMethodCallbackStr {

     int     (PR_CALLBACK *auxOutput)(const char *outputString);

     size_t  (PR_CALLBACK *strftime)(char *s, size_t len, const char *fmt, const struct tm *p);

     void *  (PR_CALLBACK *malloc)( size_t size );

     void *  (PR_CALLBACK *calloc)(size_t n, size_t size );

     void *  (PR_CALLBACK *realloc)( void* old_blk, size_t size );

     void    (PR_CALLBACK *free)( void *ptr );

     void *  (PR_CALLBACK *getenv)( const char *name);

     int     (PR_CALLBACK *putenv)( const char *assoc);

 /*    void *  (PR_CALLBACK *perror)( const char *prefix ); */

 };

 NSPR_API(void) PR_MDRegisterCallbacks(struct PRMethodCallbackStr *);

 int PR_CALLBACK _PL_W16CallBackPuts( const char *outputString );

 size_t PR_CALLBACK _PL_W16CallBackStrftime( 

     char *s, 

     size_t len, 

     const char *fmt,

     const struct tm *p );

 void * PR_CALLBACK _PL_W16CallBackMalloc( size_t size );

 void * PR_CALLBACK _PL_W16CallBackCalloc( size_t n, size_t size );

 void * PR_CALLBACK _PL_W16CallBackRealloc( 

     void *old_blk, 

     size_t size );

 void   PR_CALLBACK _PL_W16CallBackFree( void *ptr );

 void * PR_CALLBACK _PL_W16CallBackGetenv( const char *name );

 int PR_CALLBACK _PL_W16CallBackPutenv( const char *assoc );

 /*

 ** Hackery! 

 **

 ** These functions are provided as static link points.

 ** This is to satisfy the quick port of Gromit to NSPR 2.0

 ** ... Don't do this! ... alas, It may never go away.

 ** 

 */

 NSPR_API(int)     PR_MD_printf(const char *, ...);

 NSPR_API(void)    PR_MD_exit(int);

 NSPR_API(size_t)  PR_MD_strftime(char *, size_t, const char *, const struct tm *); 

 NSPR_API(int)     PR_MD_sscanf(const char *, const char *, ...);

 NSPR_API(void*)   PR_MD_malloc( size_t size );

 NSPR_API(void*)   PR_MD_calloc( size_t n, size_t size );

 NSPR_API(void*)   PR_MD_realloc( void* old_blk, size_t size );

 NSPR_API(void)    PR_MD_free( void *ptr );

 NSPR_API(char*)   PR_MD_getenv( const char *name );

 NSPR_API(int)     PR_MD_putenv( const char *assoc );

 NSPR_API(int)     PR_MD_fprintf(FILE *fPtr, const char *fmt, ...);

 #define PR_INIT_CALLBACKS()                         \

     {                                               \

         static struct PRMethodCallbackStr cbf = {   \

             _PL_W16CallBackPuts,                    \

             _PL_W16CallBackStrftime,                \

             _PL_W16CallBackMalloc,                  \

             _PL_W16CallBackCalloc,                  \

             _PL_W16CallBackRealloc,                 \

             _PL_W16CallBackFree,                    \

             _PL_W16CallBackGetenv,                  \

             _PL_W16CallBackPutenv,                  \

         };                                          \

         PR_MDRegisterCallbacks( &cbf );             \

     }

 /*

 ** Get the exception context for Win16 MFC applications threads

 */

 NSPR_API(void *) PR_W16GetExceptionContext(void);

 /*

 ** Set the exception context for Win16 MFC applications threads

 */

 NSPR_API(void) PR_W16SetExceptionContext(void *context);

 PR_END_EXTERN_C

 #else

 /*

 ** For platforms other than Win16, define

 ** PR_STDIO_INIT() as a No-Op.

 */

 #define PR_STDIO_INIT()

 #endif /* WIN16 || MOZILLA_CLIENT */

 #endif /* prwin16_h___ */