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80 lines
3.1 KiB
C
80 lines
3.1 KiB
C
/* Handling of dynamic sring tokens.
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Copyright (C) 1999-2018 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, see
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<http://www.gnu.org/licenses/>. */
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#include "trusted-dirs.h"
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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) \
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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 (__glibc_unlikely (__sf != NULL)) \
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__cnt = _dl_dst_count (__sf); \
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\
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__cnt; })
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#ifdef SHARED
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# define IS_RTLD(l) (l) == &GL(dl_rtld_map)
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#else
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# define IS_RTLD(l) 0
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#endif
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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 dst_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 (MAX (strlen (ORIGIN), strlen (_dl_platform)), \
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strlen (DL_DST_LIB)) \
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minus 4 (which is the length of "$LIB"). \
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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 or, when \
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auditing, in ld.so. */ \
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if ((l)->l_origin == NULL) \
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{ \
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assert ((l)->l_name[0] == '\0' || IS_RTLD (l)); \
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(l)->l_origin = _dl_get_origin (); \
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dst_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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dst_len = (l)->l_origin == (char *) -1 \
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? 0 : strlen ((l)->l_origin); \
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\
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const char *exec_origin = GLRO(google_exec_origin_dir); \
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size_t exec_origin_len = \
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(exec_origin == NULL) ? 0 : strlen (exec_origin); \
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\
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dst_len = MAX (MAX (MAX (dst_len, GLRO(dl_platformlen)), \
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strlen (DL_DST_LIB)), exec_origin_len); \
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if (dst_len > 4) \
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__len += __cnt * (dst_len - 4); \
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} \
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\
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__len; })
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