applink.c

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#define APPLINK_STDIN   1
#define APPLINK_STDOUT  2
#define APPLINK_STDERR  3
#define APPLINK_FPRINTF 4
#define APPLINK_FGETS   5
#define APPLINK_FREAD   6
#define APPLINK_FWRITE  7
#define APPLINK_FSETMOD 8
#define APPLINK_FEOF 9
#define APPLINK_FCLOSE  10 /* should not be used */

#define APPLINK_FOPEN   11 /* solely for completeness */
#define APPLINK_FSEEK   12
#define APPLINK_FTELL   13
#define APPLINK_FFLUSH  14
#define APPLINK_FERROR  15
#define APPLINK_CLEARERR 16
#define APPLINK_FILENO  17 /* to be used with below */

#define APPLINK_OPEN 18 /* formally can't be used, as flags can vary */
#define APPLINK_READ 19
#define APPLINK_WRITE   20
#define APPLINK_LSEEK   21
#define APPLINK_CLOSE   22
#define APPLINK_MAX  22 /* always same as last macro */

#ifndef APPMACROS_ONLY
#include <stdio.h>
#include <io.h>
#include <fcntl.h>

static void *app_stdin(void)     { return stdin;  }
static void *app_stdout(void)    { return stdout; }
static void *app_stderr(void)    { return stderr; }
static int   app_feof(FILE *fp)     { return feof(fp); }
static int   app_ferror(FILE *fp)   { return ferror(fp); }
static void  app_clearerr(FILE *fp) { clearerr(fp); }
static int   app_fileno(FILE *fp)   { return _fileno(fp); }
static int   app_fsetmod(FILE *fp,char mod)
{ return _setmode (_fileno(fp),mod=='b'?_O_BINARY:_O_TEXT); }

#ifdef __cplusplus
extern "C" {
#endif

__declspec(dllexport)
void **
#if defined(__BORLANDC__)
__stdcall   /* __stdcall appears to be the only way to get the name
       * decoration right with Borland C. Otherwise it works
       * purely incidentally, as we pass no parameters. */
#else
__cdecl
#endif
OPENSSL_Applink(void)
{ static int once=1;
  static void *OPENSSL_ApplinkTable[APPLINK_MAX+1]={(void *)APPLINK_MAX};

    if (once)
    { OPENSSL_ApplinkTable[APPLINK_STDIN] = app_stdin;
   OPENSSL_ApplinkTable[APPLINK_STDOUT]   = app_stdout;
   OPENSSL_ApplinkTable[APPLINK_STDERR]   = app_stderr;
   OPENSSL_ApplinkTable[APPLINK_FPRINTF]  = fprintf;
   OPENSSL_ApplinkTable[APPLINK_FGETS] = fgets;
   OPENSSL_ApplinkTable[APPLINK_FREAD] = fread;
   OPENSSL_ApplinkTable[APPLINK_FWRITE]   = fwrite;
   OPENSSL_ApplinkTable[APPLINK_FSETMOD]  = app_fsetmod;
   OPENSSL_ApplinkTable[APPLINK_FEOF]  = app_feof;
   OPENSSL_ApplinkTable[APPLINK_FCLOSE]   = fclose;

   OPENSSL_ApplinkTable[APPLINK_FOPEN] = fopen;
   OPENSSL_ApplinkTable[APPLINK_FSEEK] = fseek;
   OPENSSL_ApplinkTable[APPLINK_FTELL] = ftell;
   OPENSSL_ApplinkTable[APPLINK_FFLUSH]   = fflush;
   OPENSSL_ApplinkTable[APPLINK_FERROR]   = app_ferror;
   OPENSSL_ApplinkTable[APPLINK_CLEARERR] = app_clearerr;
   OPENSSL_ApplinkTable[APPLINK_FILENO]   = app_fileno;

   OPENSSL_ApplinkTable[APPLINK_OPEN]  = _open;
   OPENSSL_ApplinkTable[APPLINK_READ]  = _read;
   OPENSSL_ApplinkTable[APPLINK_WRITE] = _write;
   OPENSSL_ApplinkTable[APPLINK_LSEEK] = _lseek;
   OPENSSL_ApplinkTable[APPLINK_CLOSE] = _close;

   once = 0;
    }

  return OPENSSL_ApplinkTable;
}

#ifdef __cplusplus
}
#endif
#endif