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Diffstat (limited to 'REORG.TODO/elf/dl-dst.h')
| -rw-r--r-- | REORG.TODO/elf/dl-dst.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/REORG.TODO/elf/dl-dst.h b/REORG.TODO/elf/dl-dst.h new file mode 100644 index 0000000000..a96513d4dc --- /dev/null +++ b/REORG.TODO/elf/dl-dst.h @@ -0,0 +1,74 @@ +/* Handling of dynamic sring tokens. + Copyright (C) 1999-2017 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; }) |