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/gecko_api/include/prwin16.h

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  1/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
  2/* ***** BEGIN LICENSE BLOCK *****
  3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  4 *
  5 * The contents of this file are subject to the Mozilla Public License Version
  6 * 1.1 (the "License"); you may not use this file except in compliance with
  7 * the License. You may obtain a copy of the License at
  8 * http://www.mozilla.org/MPL/
  9 *
 10 * Software distributed under the License is distributed on an "AS IS" basis,
 11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 12 * for the specific language governing rights and limitations under the
 13 * License.
 14 *
 15 * The Original Code is the Netscape Portable Runtime (NSPR).
 16 *
 17 * The Initial Developer of the Original Code is
 18 * Netscape Communications Corporation.
 19 * Portions created by the Initial Developer are Copyright (C) 1998-2000
 20 * the Initial Developer. All Rights Reserved.
 21 *
 22 * Contributor(s):
 23 *
 24 * Alternatively, the contents of this file may be used under the terms of
 25 * either the GNU General Public License Version 2 or later (the "GPL"), or
 26 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 27 * in which case the provisions of the GPL or the LGPL are applicable instead
 28 * of those above. If you wish to allow use of your version of this file only
 29 * under the terms of either the GPL or the LGPL, and not to allow others to
 30 * use your version of this file under the terms of the MPL, indicate your
 31 * decision by deleting the provisions above and replace them with the notice
 32 * and other provisions required by the GPL or the LGPL. If you do not delete
 33 * the provisions above, a recipient may use your version of this file under
 34 * the terms of any one of the MPL, the GPL or the LGPL.
 35 *
 36 * ***** END LICENSE BLOCK ***** */
 37
 38#ifndef prwin16_h___
 39#define prwin16_h___
 40
 41/*
 42** Condition use of this header on platform.
 43*/
 44#if (defined(XP_PC) && !defined(_WIN32) && !defined(XP_OS2) && defined(MOZILLA_CLIENT)) || defined(WIN16)
 45#include <stdio.h>
 46
 47PR_BEGIN_EXTERN_C
 48/* 
 49** Win16 stdio special case.
 50** To get stdio to work for Win16, all calls to printf() and related
 51** things must be called from the environment of the .EXE; calls to
 52** printf() from the .DLL send output to the bit-bucket.
 53**
 54** To make sure that PR_fprintf(), and related functions, work correctly,
 55** the actual stream I/O to stdout, stderr, stdin must be done in the
 56** .EXE. To do this, a hack is placed in _MD_Write() such that the
 57** fd for stdio handles results in a call to the .EXE.
 58**
 59** file w16stdio.c contains the functions that get called from NSPR
 60** to do the actual I/O. w16stdio.o must be statically linked with
 61** any application needing stdio for Win16.
 62**
 63** The address of these functions must be made available to the .DLL
 64** so he can call back to the .EXE. To do this, function 
 65** PR_MD_RegisterW16StdioCallbacks() is called from the .EXE.
 66** The arguments are the functions defined in w16stdio.c
 67** At runtime, MD_Write() calls the registered functions, if any
 68** were registered.
 69**
 70** prinit.h contains a macro PR_STDIO_INIT() that calls the registration
 71** function for Win16; For other platforms, the macro is a No-Op.
 72**
 73** Note that stdio is not operational at all on Win16 GUI applications.
 74** This special case exists to provide stdio capability from the NSPR
 75** .DLL for command line applications only. NSPR's test cases are
 76** almost exclusively command line applications.
 77**
 78** See also: w16io.c, w16stdio.c
 79*/
 80typedef PRInt32 (PR_CALLBACK *PRStdinRead)( void *buf, PRInt32 amount);
 81typedef PRInt32 (PR_CALLBACK *PRStdoutWrite)( void *buf, PRInt32 amount);
 82typedef PRInt32 (PR_CALLBACK *PRStderrWrite)( void *buf, PRInt32 amount);
 83
 84NSPR_API(PRStatus)
 85PR_MD_RegisterW16StdioCallbacks( 
 86    PRStdinRead inReadf,            /* i: function pointer for stdin read       */
 87    PRStdoutWrite outWritef,        /* i: function pointer for stdout write     */
 88    PRStderrWrite errWritef         /* i: function pointer for stderr write     */
 89    );
 90
 91NSPR_API(PRInt32)
 92_PL_W16StdioWrite( void *buf, PRInt32 amount );
 93
 94NSPR_API(PRInt32)
 95_PL_W16StdioRead( void *buf, PRInt32 amount );
 96
 97#define PR_STDIO_INIT() PR_MD_RegisterW16StdioCallbacks( \
 98    _PL_W16StdioRead, _PL_W16StdioWrite, _PL_W16StdioWrite ); \
 99    PR_INIT_CALLBACKS();
100
101/*
102** Win16 hackery.
103**
104*/
105struct PRMethodCallbackStr {
106    int     (PR_CALLBACK *auxOutput)(const char *outputString);
107    size_t  (PR_CALLBACK *strftime)(char *s, size_t len, const char *fmt, const struct tm *p);
108    void *  (PR_CALLBACK *malloc)( size_t size );
109    void *  (PR_CALLBACK *calloc)(size_t n, size_t size );
110    void *  (PR_CALLBACK *realloc)( void* old_blk, size_t size );
111    void    (PR_CALLBACK *free)( void *ptr );
112    void *  (PR_CALLBACK *getenv)( const char *name);
113    int     (PR_CALLBACK *putenv)( const char *assoc);
114/*    void *  (PR_CALLBACK *perror)( const char *prefix ); */
115};
116
117NSPR_API(void) PR_MDRegisterCallbacks(struct PRMethodCallbackStr *);
118
119int PR_CALLBACK _PL_W16CallBackPuts( const char *outputString );
120size_t PR_CALLBACK _PL_W16CallBackStrftime( 
121    char *s, 
122    size_t len, 
123    const char *fmt,
124    const struct tm *p );
125void * PR_CALLBACK _PL_W16CallBackMalloc( size_t size );
126void * PR_CALLBACK _PL_W16CallBackCalloc( size_t n, size_t size );
127void * PR_CALLBACK _PL_W16CallBackRealloc( 
128    void *old_blk, 
129    size_t size );
130void   PR_CALLBACK _PL_W16CallBackFree( void *ptr );
131void * PR_CALLBACK _PL_W16CallBackGetenv( const char *name );
132int PR_CALLBACK _PL_W16CallBackPutenv( const char *assoc );
133
134/*
135** Hackery! 
136**
137** These functions are provided as static link points.
138** This is to satisfy the quick port of Gromit to NSPR 2.0
139** ... Don't do this! ... alas, It may never go away.
140** 
141*/
142NSPR_API(int)     PR_MD_printf(const char *, ...);
143NSPR_API(void)    PR_MD_exit(int);
144NSPR_API(size_t)  PR_MD_strftime(char *, size_t, const char *, const struct tm *); 
145NSPR_API(int)     PR_MD_sscanf(const char *, const char *, ...);
146NSPR_API(void*)   PR_MD_malloc( size_t size );
147NSPR_API(void*)   PR_MD_calloc( size_t n, size_t size );
148NSPR_API(void*)   PR_MD_realloc( void* old_blk, size_t size );
149NSPR_API(void)    PR_MD_free( void *ptr );
150NSPR_API(char*)   PR_MD_getenv( const char *name );
151NSPR_API(int)     PR_MD_putenv( const char *assoc );
152NSPR_API(int)     PR_MD_fprintf(FILE *fPtr, const char *fmt, ...);
153
154#define PR_INIT_CALLBACKS()                         \
155    {                                               \
156        static struct PRMethodCallbackStr cbf = {   \
157            _PL_W16CallBackPuts,                    \
158            _PL_W16CallBackStrftime,                \
159            _PL_W16CallBackMalloc,                  \
160            _PL_W16CallBackCalloc,                  \
161            _PL_W16CallBackRealloc,                 \
162            _PL_W16CallBackFree,                    \
163            _PL_W16CallBackGetenv,                  \
164            _PL_W16CallBackPutenv,                  \
165        };                                          \
166        PR_MDRegisterCallbacks( &cbf );             \
167    }
168
169
170/*
171** Get the exception context for Win16 MFC applications threads
172*/
173NSPR_API(void *) PR_W16GetExceptionContext(void);
174/*
175** Set the exception context for Win16 MFC applications threads
176*/
177NSPR_API(void) PR_W16SetExceptionContext(void *context);
178
179PR_END_EXTERN_C
180#else
181/*
182** For platforms other than Win16, define
183** PR_STDIO_INIT() as a No-Op.
184*/
185#define PR_STDIO_INIT()
186#endif /* WIN16 || MOZILLA_CLIENT */
187
188#endif /* prwin16_h___ */
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