mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
2541eda0d4
2001-03-19 Ulrich Drepper <drepper@redhat.com> * elf/dl-dst.h (DL_DST_COUNT): Add __builtin_expect. * elf/dl-load.c (_dl_dst_count): Make DST recognition more robust. (_dl_dst_substitute): Likewise.
73 lines
3.0 KiB
C
73 lines
3.0 KiB
C
/* Handling of dynamic sring tokens.
|
|
Copyright (C) 1999, 2001 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. 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, '$'); \
|
|
\
|
|
if (__builtin_expect (__sf != NULL, 0)) \
|
|
__cnt = _dl_dst_count (__sf, is_path); \
|
|
\
|
|
__cnt; })
|
|
|
|
/* Prototype for used function. */
|
|
extern size_t _dl_dst_count (const char *name, int is_path);
|
|
|
|
|
|
/* Guess from the number of DSTs the length of the result string. */
|
|
#define DL_DST_REQUIRED(l, name, len, cnt) \
|
|
({ \
|
|
size_t origin_len; \
|
|
size_t __len = (len); \
|
|
\
|
|
/* Now we make a guess how many extra characters on top of the length \
|
|
of S we need to represent the result. We know that we have CNT \
|
|
replacements. Each at most can use \
|
|
MAX (strlen (ORIGIN), strlen (_dl_platform)) \
|
|
minus 7 (which is the length of "$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, _dl_platformlen) - 7); })
|
|
|
|
/* Find origin of the executable. */
|
|
extern const char *_dl_get_origin (void);
|
|
|
|
|
|
/* Perform the DST substitution. */
|
|
#define DL_DST_SUBSTITUTE(l, name, res, is_path) \
|
|
_dl_dst_substitute (l, name, res, is_path)
|
|
|
|
/* Prototype for used function. */
|
|
extern char *_dl_dst_substitute (struct link_map *l, const char *name,
|
|
char *result, int is_path);
|