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