usr/src/lib/libast/common/stdio/_stdfun.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23
  24 #include <ast.h>
  25
  26 #if !_UWIN
  27
  28 void _STUB_stdfun(){}
  29
  30 #else
  31
  32 #include <ast_windows.h>
  33 #include <uwin.h>
  34 #include <dlfcn.h>
  35 #include "FEATURE/uwin"
  36
  37 #if _lib___iob_func
  38 #define IOB             ((char*)__iob_func())
  39 #elif _lib___p__iob
  40 #define IOB             ((char*)__p__iob())
  41 #elif _dat__iob
  42 #define IOB             ((char*)_iob)
  43 #else
  44 #define IOB             ((char*)_p__iob())
  45 #endif
  46
  47 #define IOBMAX          (512*32)
  48
  49 #include "stdhdr.h"
  50
  51 int
  52 _stdfun(Sfio_t* f, Funvec_t* vp)
  53 {
  54         static char*    iob;
  55         static int      init;
  56         static void*    bp;
  57         static void*    np;
  58
  59         if (!iob && !(iob = IOB))
  60                 return 0;
  61         if (f && ((char*)f < iob || (char*)f > iob+IOBMAX))
  62                 return 0;
  63         if (!vp->vec[1])
  64         {
  65                 if (!init)
  66                 {
  67                         init = 1;
  68                         bp = dlopen("/usr/bin/stdio.dll", 0);
  69                 }
  70                 if (bp && (vp->vec[1] = (Fun_f)dlsym(bp, vp->name)))
  71                         return 1;
  72                 if (!np && !(np = dlopen("/sys/msvcrt.dll", 0)))
  73                         return -1;
  74                 if (!(vp->vec[1] = (Fun_f)dlsym(np, vp->name)))
  75                         return -1;
  76         }
  77         return 1;
  78 }
  79
  80 #endif