usr/src/lib/libdll/common/dlllook.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1997-2010 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 *                                                                      *
  19 ***********************************************************************/
  20 #pragma prototyped
  21 /*
  22  * Glenn Fowler
  23  * AT&T Research
  24  */
  25
  26 #include <ast.h>
  27 #include <dlldefs.h>
  28
  29 /*
  30  * dlsym() with `_' weak fallback
  31  */
  32
  33 void*
  34 dlllook(void* dll, const char* name)
  35 {
  36         register void*  addr;
  37         char            buf[256];
  38
  39         if (!(addr = dlsym(dll, name)) && strlen(name) < (sizeof(buf) - 2))
  40         {
  41                 buf[0] = '_';
  42                 strcpy(buf + 1, name);
  43                 addr = dlsym(dll, buf);
  44         }
  45         return addr;
  46 }