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