Logo Search packages:      
Sourcecode: glibc version File versions

dl-dst.h

/* Handling of dynamic sring tokens.
   Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* Determine the number of DST elements in the name.  Only if IS_PATH is
   nonzero paths are recognized (i.e., multiple, ':' separated filenames).  */
#define DL_DST_COUNT(name, is_path) \
  ({                                                        \
    size_t __cnt = 0;                                             \
    const char *__sf = strchr (name, '$');                              \
                                                            \
    if (__builtin_expect (__sf != NULL, 0))                             \
      __cnt = INTUSE(_dl_dst_count) (__sf, is_path);                    \
                                                            \
    __cnt; })

/* Prototype for used function.  */
extern size_t _dl_dst_count (const char *name, int is_path);
extern size_t _dl_dst_count_internal (const char *name, int is_path);


/* Guess from the number of DSTs the length of the result string.  */
#define DL_DST_REQUIRED(l, name, len, cnt) \
  ({                                                        \
    size_t origin_len;                                            \
    size_t __len = (len);                                         \
                                                            \
    /* Now we make a guess how many extra characters on top of the length     \
       of S we need to represent the result.  We know that we have CNT        \
       replacements.  Each at most can use                              \
         MAX (strlen (ORIGIN), strlen (_dl_platform))                   \
       minus 7 (which is the length of "$ORIGIN").                      \
                                                            \
       First get the origin string if it is not available yet.  This can      \
       only happen for the map of the executable.  */                   \
    if ((l)->l_origin == NULL)                                          \
      {                                                           \
      assert ((l)->l_name[0] == '\0');                            \
      (l)->l_origin = _dl_get_origin ();                          \
      origin_len = ((l)->l_origin && (l)->l_origin != (char *) -1       \
                  ? strlen ((l)->l_origin) : 0);                        \
      }                                                           \
    else                                                    \
      origin_len = (l)->l_origin == (char *) -1 ? 0 : strlen ((l)->l_origin); \
                                                            \
    __len + cnt * (MAX (origin_len, GL(dl_platformlen)) - 7); })

/* Find origin of the executable.  */
extern const char *_dl_get_origin (void);
extern const char *_dl_get_origin_internal (void);

#ifdef IS_IN_rtld
# define _dl_get_origin INTUSE(_dl_get_origin)
#endif

/* Prototype for used function.  */
extern char *_dl_dst_substitute (struct link_map *l, const char *name,
                         char *result, int is_path);
extern char *_dl_dst_substitute_internal (struct link_map *l, const char *name,
                                char *result, int is_path);

Generated by  Doxygen 1.6.0   Back to index