usr/src/lib/libast/common/path/pathcat.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  * Glenn Fowler
  25  * AT&T Bell Laboratories
  26  *
  27  * single dir support for pathaccess()
  28  */
  29
  30 #include <ast.h>
  31
  32 char*
  33 pathcat(char* path, register const char* dirs, int sep, const char* a, register const char* b)
  34 {
  35         register char*  s;
  36
  37         s = path;
  38         while (*dirs && *dirs != sep)
  39                 *s++ = *dirs++;
  40         if (s != path)
  41                 *s++ = '/';
  42         if (a)
  43         {
  44                 while (*s = *a++)
  45                         s++;
  46                 if (b)
  47                         *s++ = '/';
  48         }
  49         else if (!b)
  50                 b = ".";
  51         if (b)
  52                 while (*s++ = *b++);
  53         return *dirs ? (char*)++dirs : 0;
  54 }