mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 16:50:07 +00:00
72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
/* Bounded-pointer checking macros for C.
|
|
Copyright (C) 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Greg McGary <greg@mcgary.org>
|
|
|
|
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/>. */
|
|
|
|
|
|
#if __BOUNDED_POINTERS__
|
|
|
|
/* The command-line arg vector and environment vector come to us from
|
|
the OS as an unbounded pointer to an array of unbounded strings.
|
|
The user's main expects argv and __environ to be bounded pointers
|
|
to arrays of bounded strings. */
|
|
# define INIT_ARGV_and_ENVIRON \
|
|
do { \
|
|
int envc; \
|
|
for (envc = 0; *ubp_ev; ubp_ev++, envc++) \
|
|
; \
|
|
ubp_ev -= envc; \
|
|
\
|
|
/* GKM FIXME: we could save some space by allocating only enough for \
|
|
the additional low & high words, and destructively rewriting \
|
|
argv in place. */ \
|
|
__ptrvalue (argv) = __ptrlow (argv) \
|
|
= alloca ((argc + envc + 2) * sizeof (*argv)); \
|
|
__ptrhigh (argv) = __ptrvalue (argv) + argc + 1; \
|
|
__ptrvalue (__environ) = __ptrlow (__environ) = __ptrhigh (argv); \
|
|
__ptrhigh (__environ) = __ptrvalue (__environ) + envc + 1; \
|
|
boundify_vector (__environ, ubp_ev); \
|
|
boundify_vector (argv, ubp_av); \
|
|
} while (0)
|
|
|
|
|
|
/* Copy an unbounded vector of unbounded strings into a bounded
|
|
counterpart. */
|
|
|
|
static void
|
|
boundify_vector (char **dest, char *__unbounded *__unbounded src)
|
|
{
|
|
char *__unbounded s;
|
|
for (; *src; src++, dest++)
|
|
{
|
|
__ptrvalue (*dest) = __ptrlow (*dest) = *src;
|
|
__ptrhigh (*dest) = src[1];
|
|
}
|
|
*dest = 0;
|
|
/* The OS lays out strings contiguously in vector order,
|
|
so */
|
|
for (s = __ptrvalue (dest[-1]); *s; s++)
|
|
;
|
|
__ptrhigh (dest[-1]) = ++s;
|
|
}
|
|
|
|
#else
|
|
|
|
# define INIT_ARGV_and_ENVIRON __environ = ubp_ev
|
|
|
|
#endif
|