usr/src/lib/libast/common/comp/resolvepath.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  * resolvepath implementation
  25  */
  26
  27 #define resolvepath     ______resolvepath
  28
  29 #include <ast.h>
  30 #include <error.h>
  31
  32 #undef  resolvepath
  33
  34 #undef  _def_map_ast
  35 #include <ast_map.h>
  36
  37 #if defined(__EXPORT__)
  38 #define extern  __EXPORT__
  39 #endif
  40
  41 extern int
  42 resolvepath(const char* file, char* path, size_t size)
  43 {
  44         register char*  s;
  45         register int    n;
  46         register int    r;
  47
  48         r = *file != '/';
  49         n = strlen(file) + r + 1;
  50         if (n >= size)
  51         {
  52 #ifdef ENAMETOOLONG
  53                 errno = ENAMETOOLONG;
  54 #else
  55                 errno = ENOMEM;
  56 #endif
  57                 return 0;
  58         }
  59         if (!r)
  60                 s = path;
  61         else if (!getcwd(path, size - n))
  62                 return 0;
  63         else
  64         {
  65                 s = path + strlen(path);
  66                 *s++ = '/';
  67         }
  68         strcpy(s, file);
  69         return pathcanon(path, PATH_PHYSICAL|PATH_DOTDOT|PATH_EXISTS) ? strlen(path) : -1;
  70 }