mirror of https://github.com/citusdata/citus.git
152 lines
4.7 KiB
C
152 lines
4.7 KiB
C
/*------------------------------------------------------------------
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* memcpy16_s
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*
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* October 2008, Bo Berry
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*
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* Copyright (c) 2008-2011 Cisco Systems
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*------------------------------------------------------------------
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*/
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#include "safeclib_private.h"
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#include "safe_mem_constraint.h"
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#include "mem_primitives_lib.h"
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#include "safe_mem_lib.h"
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/**
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* NAME
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* memcpy16_s
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*
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* SYNOPSIS
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* #include "safe_mem_lib.h"
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* errno_t
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* memcpy16_s(uint16_t *dest, rsize_t dmax,
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* const uint16_t *src, rsize_t smax)
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*
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* DESCRIPTION
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* This function copies at most smax uint16_ts from src to dest, up to
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* dmax.
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*
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* EXTENSION TO
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* ISO/IEC JTC1 SC22 WG14 N1172, Programming languages, environments
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* and system software interfaces, Extensions to the C Library,
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* Part I: Bounds-checking interfaces
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*
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* INPUT PARAMETERS
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* dest pointer to memory that will be replaced by src.
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*
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* dmax maximum length of the resulting dest
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*
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* src pointer to the memory that will be copied to dest
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*
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* smax maximum number uint16_t of src to copy
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*
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*
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* OUTPUT PARAMETERS
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* dest is updated
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*
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* RUNTIME CONSTRAINTS
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* Neither dest nor src shall be a null pointer.
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* Neither dmax nor smax shall be 0.
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* dmax shall not be greater than RSIZE_MAX_MEM16.
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* smax shall not be greater than dmax.
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* Copying shall not take place between objects that overlap.
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* If there is a runtime-constraint violation, the memcpy_s function stores
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* zeros in the first dmax bytes of the object pointed to by dest
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* if dest is not a null pointer and smax is valid.
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*
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* RETURN VALUE
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* EOK successful operation
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* ESNULLP NULL pointer
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* ESZEROL zero length
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* ESLEMAX length exceeds max limit
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* ESOVRLP source memory overlaps destination
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*
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* ALSO SEE
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* memcpy_s(), memcpy32_s(), memmove_s(), memmove16_s(), memmove32_s()
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*
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*/
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errno_t
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memcpy16_s (uint16_t *dest, rsize_t dmax, const uint16_t *src, rsize_t smax)
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{
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if (dest == NULL) {
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invoke_safe_mem_constraint_handler("memcpy16_s: dest is NULL",
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NULL, ESNULLP);
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return (RCNEGATE(ESNULLP));
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}
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if (dmax == 0) {
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invoke_safe_mem_constraint_handler("memcpy16_s: dmax is 0",
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NULL, ESZEROL);
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return (RCNEGATE(ESZEROL));
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}
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if (dmax > RSIZE_MAX_MEM16) {
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invoke_safe_mem_constraint_handler("memcpy16_s: dmax exceeds max",
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NULL, ESLEMAX);
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return (RCNEGATE(ESLEMAX));
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}
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if (smax == 0) {
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mem_prim_set16(dest, dmax, 0);
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invoke_safe_mem_constraint_handler("memcpy16_s: smax is 0",
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NULL, ESZEROL);
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return (RCNEGATE(ESZEROL));
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}
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if (smax > dmax) {
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mem_prim_set16(dest, dmax, 0);
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invoke_safe_mem_constraint_handler("memcpy16_s: smax exceeds dmax",
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NULL, ESLEMAX);
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return (RCNEGATE(ESLEMAX));
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}
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if (src == NULL) {
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mem_prim_set16(dest, dmax, 0);
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invoke_safe_mem_constraint_handler("memcpy16_s: src is NULL",
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NULL, ESNULLP);
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return (RCNEGATE(ESNULLP));
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}
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/*
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* overlap is undefined behavior, do not allow
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*/
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if( ((dest > src) && (dest < (src+smax))) ||
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((src > dest) && (src < (dest+dmax))) ) {
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mem_prim_set16(dest, dmax, 0);
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invoke_safe_mem_constraint_handler("memcpy16_s: overlap undefined",
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NULL, ESOVRLP);
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return (RCNEGATE(ESOVRLP));
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}
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/*
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* now perform the copy
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*/
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mem_prim_move16(dest, src, smax);
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return (RCNEGATE(EOK));
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}
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EXPORT_SYMBOL(memcpy16_s)
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