| /* Handling of dynamic sring tokens. |
| Copyright (C) 1999-2014 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, '$'); \ |
| \ |
| if (__builtin_expect (__sf != NULL, 0)) \ |
| __cnt = _dl_dst_count (__sf, is_path); \ |
| \ |
| __cnt; }) |
| |
| |
| #ifdef SHARED |
| # define IS_RTLD(l) (l) == &GL(dl_rtld_map) |
| #else |
| # define IS_RTLD(l) 0 |
| #endif |
| /* Guess from the number of DSTs the length of the result string. */ |
| #define DL_DST_REQUIRED(l, name, len, cnt) \ |
| ({ \ |
| size_t __len = (len); \ |
| size_t __cnt = (cnt); \ |
| \ |
| if (__cnt > 0) \ |
| { \ |
| size_t dst_len; \ |
| /* Now we make a guess how many extra characters on top of the \ |
| length of S we need to represent the result. We know that \ |
| we have CNT replacements. Each at most can use \ |
| MAX (MAX (strlen (ORIGIN), strlen (_dl_platform)), \ |
| strlen (DL_DST_LIB)) \ |
| minus 4 (which is the length of "$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); \ |
| \ |
| char *exec_origin = GLRO(google_exec_origin_dir); \ |
| size_t exec_origin_len = \ |
| (exec_origin == NULL) ? 0 : strlen (exec_origin); \ |
| \ |
| dst_len = MAX (MAX (MAX (dst_len, GLRO(dl_platformlen)), \ |
| strlen (DL_DST_LIB)), exec_origin_len); \ |
| if (dst_len > 4) \ |
| __len += __cnt * (dst_len - 4); \ |
| } \ |
| \ |
| __len; }) |
