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glibc/elf/dl-dst.h
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/* Handling of dynamic sring tokens. | |
Copyright (C) 1999-2016 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, see | |
<http://www.gnu.org/licenses/>. */ | |
#include "trusted-dirs.h" | |
/* 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, '$'); \ | |
\ | |
if (__glibc_unlikely (__sf != NULL)) \ | |
__cnt = _dl_dst_count (__sf, is_path); \ | |
\ | |
__cnt; }) | |
#ifdef SHARED | |
# define IS_RTLD(l) (l) == &GL(dl_rtld_map) | |
#else | |
# define IS_RTLD(l) 0 | |
#endif | |
/* Guess from the number of DSTs the length of the result string. */ | |
#define DL_DST_REQUIRED(l, name, len, cnt) \ | |
({ \ | |
size_t __len = (len); \ | |
size_t __cnt = (cnt); \ | |
\ | |
if (__cnt > 0) \ | |
{ \ | |
size_t dst_len; \ | |
/* Now we make a guess how many extra characters on top of the \ | |
length of S we need to represent the result. We know that \ | |
we have CNT replacements. Each at most can use \ | |
MAX (MAX (strlen (ORIGIN), strlen (_dl_platform)), \ | |
strlen (DL_DST_LIB)) \ | |
minus 4 (which is the length of "$LIB"). \ | |
\ | |
First get the origin string if it is not available yet. \ | |
This can only happen for the map of the executable or, when \ | |
auditing, in ld.so. */ \ | |
if ((l)->l_origin == NULL) \ | |
{ \ | |
assert ((l)->l_name[0] == '\0' || IS_RTLD (l)); \ | |
(l)->l_origin = _dl_get_origin (); \ | |
dst_len = ((l)->l_origin && (l)->l_origin != (char *) -1 \ | |
? strlen ((l)->l_origin) : 0); \ | |
} \ | |
else \ | |
dst_len = (l)->l_origin == (char *) -1 \ | |
? 0 : strlen ((l)->l_origin); \ | |
dst_len = MAX (MAX (dst_len, GLRO(dl_platformlen)), \ | |
strlen (DL_DST_LIB)); \ | |
if (dst_len > 4) \ | |
__len += __cnt * (dst_len - 4); \ | |
} \ | |
\ | |
__len; }) |