104 lines
4.1 KiB
C
104 lines
4.1 KiB
C
/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: Internal data and routines for "Safer C", or bounds-checking
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* library extension.
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*
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****************************************************************************/
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#ifndef _SAFERLIB_H_INCLUDED
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#define _SAFERLIB_H_INCLUDED
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#define __STDC_WANT_LIB_EXT1__ 1
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#include <stdlib.h>
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#include <stdint.h>
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// Maximum length of runtime-constraint error message
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#define RTCT_MSG_MAX 128
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#define _RWD_rtcthandler __runtime_constraint_handler
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extern constraint_handler_t __runtime_constraint_handler;
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extern void __rtct_fail( const char *fn, const char *reason, void *reserved );
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// Runtime-constraint validation macros. Call the handler and return zero if check
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// failed, return non-zero value if check succeeded.
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#define __check_constraint_nullptr( arg ) \
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((arg == NULL) ? __rtct_fail( __func__, #arg " == NULL", NULL ), 0 : 1)
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#define __check_constraint_maxsize( arg ) \
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((arg > RSIZE_MAX) ? __rtct_fail( __func__, #arg " > RSIZE_MAX", NULL ), 0 : 1)
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#define __check_constraint_zero( arg ) \
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((arg == 0) ? __rtct_fail( __func__, #arg " == 0", NULL ), 0 : 1)
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#define __check_constraint_toosmall( name, left ) \
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((left == 0) ? __rtct_fail( __func__, #name " is too small to hold data", NULL ), 0 : 1)
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// Runtime-constraint validation macros. Construct the message and return
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// zero if check failed, return non-zero value if check succeeded.
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// __rtct_fail has to be explicitly called later.
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#define __check_constraint_nullptr_msg( msg, arg ) \
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((arg == NULL) ? ( msg = #arg " == NULL" ), 0 : 1)
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#define __check_constraint_maxsize_msg( msg, arg ) \
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((arg > RSIZE_MAX) ? ( msg = #arg " > RSIZE_MAX" ), 0 : 1)
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#define __check_constraint_zero_msg( msg, arg ) \
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((arg == 0) ? ( msg = #arg " == 0" ), 0 : 1)
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#define __check_constraint_toosmall_msg( msg, name, left ) \
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((left == 0) ? ( msg = #name " is too small to hold data" ), 0 : 1)
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#define __check_constraint_a_gt_b_msg( msg, a, b ) \
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((a > b) ? ( msg = #a " > " #b ), 0 : 1)
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#define __check_constraint_overlap_msg( msg, p1, len1, p2, len2 ) \
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(((p1 == p2) || ( (p1 > p2) && ( p1 < (CHAR_TYPE *)p2 + len2 * sizeof( CHAR_TYPE ))) \
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|| ( (p2 > p1) && ( p2 < (CHAR_TYPE *)p1 + len1 * sizeof( CHAR_TYPE )))) \
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? ( msg = #p1 " overlap " #p2 ), 0 : 1)
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// For 16-bit targets, the RSIZE_MAX check is effectively no-op. Object sizes
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// up to SIZE_MAX are legal and not uncommon.
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#if RSIZE_MAX == SIZE_MAX
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#undef __check_constraint_maxsize
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#define __check_constraint_maxsize( arg ) 1
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#undef __check_constraint_maxsize_msg
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#define __check_constraint_maxsize_msg( msg, arg ) 1
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#define __lte_rsizmax( arg ) 1
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#else
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#define __lte_rsizmax( arg ) (arg <= RSIZE_MAX)
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#endif
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#endif // _SAFERLIB_H_INCLUDED
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