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d4b04a331c
2003-12-31 Ulrich Drepper <drepper@redhat.com> * elf/dl-dst.h (DL_DST_REQUIRED): Avoid the complex operations if CNT == 0.
83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
/* Handling of dynamic sring tokens.
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Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* Determine the number of DST elements in the name. Only if IS_PATH is
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nonzero paths are recognized (i.e., multiple, ':' separated filenames). */
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#define DL_DST_COUNT(name, is_path) \
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({ \
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size_t __cnt = 0; \
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const char *__sf = strchr (name, '$'); \
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\
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if (__builtin_expect (__sf != NULL, 0)) \
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__cnt = INTUSE(_dl_dst_count) (__sf, is_path); \
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\
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__cnt; })
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/* Prototype for used function. */
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extern size_t _dl_dst_count (const char *name, int is_path);
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extern size_t _dl_dst_count_internal (const char *name, int is_path);
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/* Guess from the number of DSTs the length of the result string. */
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#define DL_DST_REQUIRED(l, name, len, cnt) \
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({ \
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size_t __len = (len); \
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size_t __cnt = (cnt); \
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\
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if (__cnt > 0) \
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{ \
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size_t origin_len; \
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/* Now we make a guess how many extra characters on top of the \
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length of S we need to represent the result. We know that \
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we have CNT replacements. Each at most can use \
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MAX (strlen (ORIGIN), strlen (_dl_platform)) \
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minus 7 (which is the length of "$ORIGIN"). \
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\
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First get the origin string if it is not available yet. \
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This can only happen for the map of the executable. */ \
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if ((l)->l_origin == NULL) \
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{ \
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assert ((l)->l_name[0] == '\0'); \
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(l)->l_origin = _dl_get_origin (); \
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origin_len = ((l)->l_origin && (l)->l_origin != (char *) -1 \
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? strlen ((l)->l_origin) : 0); \
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} \
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else \
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origin_len = (l)->l_origin == (char *) -1 \
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? 0 : strlen ((l)->l_origin); \
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\
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__len += __cnt * (MAX (origin_len, GL(dl_platformlen)) - 7); \
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} \
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\
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__len; })
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/* Find origin of the executable. */
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extern const char *_dl_get_origin (void);
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extern const char *_dl_get_origin_internal (void);
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#ifdef IS_IN_rtld
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# define _dl_get_origin INTUSE(_dl_get_origin)
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#endif
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/* Prototype for used function. */
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extern char *_dl_dst_substitute (struct link_map *l, const char *name,
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char *result, int is_path);
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extern char *_dl_dst_substitute_internal (struct link_map *l, const char *name,
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char *result, int is_path);
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