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      1 /*
      2  * Copyright 2004-2023 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the Apache License 2.0 (the "License").  You may not use
      5  * this file except in compliance with the License.  You can obtain a copy
      6  * in the file LICENSE in the source distribution or at
      7  * https://www.openssl.org/source/license.html
      8  */
      9 
     10 #define APPLINK_STDIN 1
     11 #define APPLINK_STDOUT 2
     12 #define APPLINK_STDERR 3
     13 #define APPLINK_FPRINTF 4
     14 #define APPLINK_FGETS 5
     15 #define APPLINK_FREAD 6
     16 #define APPLINK_FWRITE 7
     17 #define APPLINK_FSETMOD 8
     18 #define APPLINK_FEOF 9
     19 #define APPLINK_FCLOSE 10 /* should not be used */
     20 
     21 #define APPLINK_FOPEN 11 /* solely for completeness */
     22 #define APPLINK_FSEEK 12
     23 #define APPLINK_FTELL 13
     24 #define APPLINK_FFLUSH 14
     25 #define APPLINK_FERROR 15
     26 #define APPLINK_CLEARERR 16
     27 #define APPLINK_FILENO 17 /* to be used with below */
     28 
     29 #define APPLINK_OPEN 18 /* formally can't be used, as flags can vary */
     30 #define APPLINK_READ 19
     31 #define APPLINK_WRITE 20
     32 #define APPLINK_LSEEK 21
     33 #define APPLINK_CLOSE 22
     34 #define APPLINK_MAX 22 /* always same as last macro */
     35 
     36 #ifndef APPMACROS_ONLY
     37 
     38 /*
     39  * Normally, do not define APPLINK_NO_INCLUDES.  Define it if you are using
     40  * symbol preprocessing and do not want the preprocessing to affect the
     41  * following included header files.  You will need to put these
     42  * include lines somewhere in the file that is including applink.c.
     43  */
     44 #ifndef APPLINK_NO_INCLUDES
     45 #include <stdio.h>
     46 #include <io.h>
     47 #include <fcntl.h>
     48 #endif
     49 
     50 #ifdef __BORLANDC__
     51 /* _lseek in <io.h> is a function-like macro so we can't take its address */
     52 #undef _lseek
     53 #define _lseek lseek
     54 #endif
     55 
     56 static void *app_stdin(void)
     57 {
     58     return stdin;
     59 }
     60 
     61 static void *app_stdout(void)
     62 {
     63     return stdout;
     64 }
     65 
     66 static void *app_stderr(void)
     67 {
     68     return stderr;
     69 }
     70 
     71 static int app_feof(FILE *fp)
     72 {
     73     return feof(fp);
     74 }
     75 
     76 static int app_ferror(FILE *fp)
     77 {
     78     return ferror(fp);
     79 }
     80 
     81 static void app_clearerr(FILE *fp)
     82 {
     83     clearerr(fp);
     84 }
     85 
     86 static int app_fileno(FILE *fp)
     87 {
     88     return _fileno(fp);
     89 }
     90 
     91 static int app_fsetmod(FILE *fp, char mod)
     92 {
     93     return _setmode(_fileno(fp), mod == 'b' ? _O_BINARY : _O_TEXT);
     94 }
     95 
     96 #ifdef __cplusplus
     97 extern "C" {
     98 #endif
     99 
    100 __declspec(dllexport) void **
    101 #if defined(__BORLANDC__)
    102     /*
    103      * __stdcall appears to be the only way to get the name
    104      * decoration right with Borland C. Otherwise it works
    105      * purely incidentally, as we pass no parameters.
    106      */
    107     __stdcall
    108 #else
    109     __cdecl
    110 #endif
    111     OPENSSL_Applink(void)
    112 {
    113     static int once = 1;
    114     static void *OPENSSL_ApplinkTable[APPLINK_MAX + 1] = { (void *)APPLINK_MAX };
    115 
    116     if (once) {
    117         OPENSSL_ApplinkTable[APPLINK_STDIN] = app_stdin;
    118         OPENSSL_ApplinkTable[APPLINK_STDOUT] = app_stdout;
    119         OPENSSL_ApplinkTable[APPLINK_STDERR] = app_stderr;
    120         OPENSSL_ApplinkTable[APPLINK_FPRINTF] = fprintf;
    121         OPENSSL_ApplinkTable[APPLINK_FGETS] = fgets;
    122         OPENSSL_ApplinkTable[APPLINK_FREAD] = fread;
    123         OPENSSL_ApplinkTable[APPLINK_FWRITE] = fwrite;
    124         OPENSSL_ApplinkTable[APPLINK_FSETMOD] = app_fsetmod;
    125         OPENSSL_ApplinkTable[APPLINK_FEOF] = app_feof;
    126         OPENSSL_ApplinkTable[APPLINK_FCLOSE] = fclose;
    127 
    128         OPENSSL_ApplinkTable[APPLINK_FOPEN] = fopen;
    129         OPENSSL_ApplinkTable[APPLINK_FSEEK] = fseek;
    130         OPENSSL_ApplinkTable[APPLINK_FTELL] = ftell;
    131         OPENSSL_ApplinkTable[APPLINK_FFLUSH] = fflush;
    132         OPENSSL_ApplinkTable[APPLINK_FERROR] = app_ferror;
    133         OPENSSL_ApplinkTable[APPLINK_CLEARERR] = app_clearerr;
    134         OPENSSL_ApplinkTable[APPLINK_FILENO] = app_fileno;
    135 
    136         OPENSSL_ApplinkTable[APPLINK_OPEN] = _open;
    137         OPENSSL_ApplinkTable[APPLINK_READ] = _read;
    138         OPENSSL_ApplinkTable[APPLINK_WRITE] = _write;
    139         OPENSSL_ApplinkTable[APPLINK_LSEEK] = _lseek;
    140         OPENSSL_ApplinkTable[APPLINK_CLOSE] = _close;
    141 
    142         once = 0;
    143     }
    144 
    145     return OPENSSL_ApplinkTable;
    146 }
    147 
    148 #ifdef __cplusplus
    149 }
    150 #endif
    151 #endif
    152