1: /* Handling of dynamic sring tokens.
    2:    Copyright (C) 1999,2001,2002,2003,2004,2006,2007
    3:    Free Software Foundation, Inc.
    4:    This file is part of the GNU C Library.
    5: 
    6:    The GNU C Library is free software; you can redistribute it and/or
    7:    modify it under the terms of the GNU Lesser General Public
    8:    License as published by the Free Software Foundation; either
    9:    version 2.1 of the License, or (at your option) any later version.
   10: 
   11:    The GNU C Library is distributed in the hope that it will be useful,
   12:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   13:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   14:    Lesser General Public License for more details.
   15: 
   16:    You should have received a copy of the GNU Lesser General Public
   17:    License along with the GNU C Library; if not, write to the Free
   18:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   19:    02111-1307 USA.  */
   20: 
   21: /* Determine the number of DST elements in the name.  Only if IS_PATH is
   22:    nonzero paths are recognized (i.e., multiple, ':' separated filenames).  */
   23: #define DL_DST_COUNT(name, is_path) \
   24:   ({                                                                          \
   25:     size_t __cnt = 0;                                                         \
   26:     const char *__sf = strchr (name, '$');                                    \
   27:                                                                               \
   28:     if (__builtin_expect (__sf != NULL, 0))                                   \
   29:       __cnt = _dl_dst_count (__sf, is_path);                          \
   30:                                                                               \
   31:     __cnt; })
   32: 
   33: 
   34: /* Guess from the number of DSTs the length of the result string.  */
   35: #define DL_DST_REQUIRED(l, name, len, cnt) \
   36:   ({                                                                          \
   37:     size_t __len = (len);                                                     \
   38:     size_t __cnt = (cnt);                                                     \
   39:                                                                               \
   40:     if (__cnt > 0)                                                            \
   41:       {                                                                       \
   42:         size_t origin_len;                                                   \
   43:         /* Now we make a guess how many extra characters on top of the       \
   44:            length of S we need to represent the result.  We know that        \
   45:            we have CNT replacements.  Each at most can use                   \
   46:              MAX (strlen (ORIGIN), strlen (_dl_platform))                    \
   47:            minus 7 (which is the length of "$ORIGIN").                       \
   48:                                                                               \
   49:            First get the origin string if it is not available yet.           \
   50:            This can only happen for the map of the executable.  */           \
   51:         DL_DST_REQ_STATIC (l)                                                \
   52:         if ((l)->l_origin == NULL)                                           \
   53:           {                                                                  \
   54:             assert ((l)->l_name[0] == '\0');                                 \
   55:             (l)->l_origin = _dl_get_origin ();                               \
   56:             origin_len = ((l)->l_origin && (l)->l_origin != (char *) -1              \
   57:                           ? strlen ((l)->l_origin) : 0);                   \
   58:           }                                                                  \
   59:         else                                                                 \
   60:           origin_len = (l)->l_origin == (char *) -1                          \
   61:             ? 0 : strlen ((l)->l_origin);                                    \
   62:                                                                               \
   63:         __len += __cnt * (MAX (origin_len, GLRO(dl_platformlen)) - 7);       \
   64:       }                                                                       \
   65:                                                                               \
   66:     __len; })
   67: 
   68: #ifdef SHARED
   69: # define DL_DST_REQ_STATIC(l) /* nothing */
   70: #else
   71: # define DL_DST_REQ_STATIC(l) \
   72:   if ((l) == NULL)                                                            \
   73:     {                                                                         \
   74:       const char *origin = _dl_get_origin ();                                 \
   75:       origin_len = (origin && origin != (char *) -1 ? strlen (origin) : 0);   \
   76:     }                                                                         \
   77:   else
   78: #endif