mirror of https://github.com/citusdata/citus.git
220 lines
6.8 KiB
C
220 lines
6.8 KiB
C
/*------------------------------------------------------------------
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* wcpcpy_s.c
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*
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* August 2014, D Wheeler
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*
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* Copyright (c) 2014 by Intel Corp
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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_str_constraint.h"
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#include "safe_str_lib.h"
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/**
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* NAME
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* wcpcpy_s
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*
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* SYNOPSIS
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* #include "safe_str_lib.h"
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* wchar_t *
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* wcpcpy_s(wchar_t* dest, rsize_t dmax, const wchar_t* src, errno_t *err)
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*
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* DESCRIPTION
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* The wcpcpy_s function copies the wide character string pointed
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* to by src (including the terminating null character) into the
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* array pointed to by dest, and returns a pointer to the end of
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* the wide character string. All elements following the terminating
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* null character (if any) written by wcpcpy_s in the array of
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* dmax characters pointed to by dest are nulled when
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* wcpcpy_s returns.
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*
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* SPECIFIED IN
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* ISO/IEC TR 24731, 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 string that will be replaced by src.
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*
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* dmax restricted maximum length of dest
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*
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* src pointer to the wide character string that will be copied
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* to dest
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*
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* err the error code upon error, or EOK if successful
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*
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* OUTPUT PARAMETERS
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* dest updated
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* err updated as follows:
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* EOK successful operation, the characters in src were
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* copied into dest and the result is null terminated.
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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 strings overlap
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* ESNOSPC not enough space to copy src
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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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* dmax shall not be greater than RSIZE_MAX_STR.
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* dmax shall not equal zero.
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* dmax shall be greater than strnlen_s(src, 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, then if dest
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* is not a null pointer and destmax is greater than zero and
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* not greater than RSIZE_MAX_STR, then strcpy_s nulls dest.
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*
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* RETURN VALUE
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* a wchar_t pointer to the terminating null at the end of dest
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*
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* ALSO SEE
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* wcscpy_s(), wcscat_s(), wcsncat_s(), wcsncpy_s()
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* strcpy_s, strcat_s(), strncat_s(), strncpy_s()
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*
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*/
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wchar_t *
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wcpcpy_s(wchar_t* dest, rsize_t dmax, const wchar_t* src, errno_t *err)
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{
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rsize_t orig_dmax;
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wchar_t *orig_dest;
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const wchar_t *overlap_bumper;
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if (dest == NULL) {
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invoke_safe_str_constraint_handler("wcpcpy_s: dest is null",
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NULL, ESNULLP);
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*err = RCNEGATE(ESNULLP);
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return NULL;
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}
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if (dmax == 0) {
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invoke_safe_str_constraint_handler("wcpcpy_s: dmax is 0",
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NULL, ESZEROL);
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*err = RCNEGATE(ESZEROL);
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return NULL;
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}
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if (dmax*sizeof(wchar_t) > RSIZE_MAX_STR) {
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invoke_safe_str_constraint_handler("wcpcpy_s: dmax exceeds max",
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NULL, ESLEMAX);
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*err = RCNEGATE(ESLEMAX);
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return NULL;
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}
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if (src == NULL) {
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#ifdef SAFECLIB_STR_NULL_SLACK
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/* null string to clear data */
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while (dmax) { *dest = L'\0'; dmax--; dest++; }
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#else
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*dest = L'\0';
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#endif
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invoke_safe_str_constraint_handler("wcpcpy_s: src is null",
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NULL, ESNULLP);
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*err = RCNEGATE(ESNULLP);
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return NULL;
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}
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if (dest == src) {
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/* move dest to the end of the string */
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while (dmax && (*dest != L'\0')) { dmax--; dest++; }
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if ( *dest != L'\0' ) {
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invoke_safe_str_constraint_handler("wcpcpy_s: no null terminator in dest",
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NULL, ESLEMAX);
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*err = RCNEGATE(ESLEMAX);
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return NULL;
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}
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*err = RCNEGATE(EOK);
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return dest;
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}
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/* hold base of dest in case src was not copied */
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orig_dmax = dmax;
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orig_dest = dest;
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if (dest < src) {
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overlap_bumper = src;
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while (dmax > 0) {
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if (dest == overlap_bumper) {
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handle_wc_error(orig_dest, orig_dmax, "wcpcpy_s: overlapping objects",
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ESOVRLP);
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*err = RCNEGATE(ESOVRLP);
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return NULL;
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}
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*dest = *src;
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if (*dest == L'\0') {
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#ifdef SAFECLIB_STR_NULL_SLACK
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/* null slack to clear any data */
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while (dmax) { *dest = L'\0'; dmax--; dest++; }
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#endif
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*err = RCNEGATE(EOK);
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return dest; /* successful return */
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}
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dmax--;
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dest++;
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src++;
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}
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} else {
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overlap_bumper = dest;
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while (dmax > 0) {
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if (src == overlap_bumper) {
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handle_wc_error(orig_dest, orig_dmax, "wcpcpy_s: overlapping objects",
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ESOVRLP);
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*err = RCNEGATE(ESOVRLP);
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return NULL;
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}
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*dest = *src;
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if (*dest == L'\0') {
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#ifdef SAFECLIB_STR_NULL_SLACK
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/* null slack to clear any data */
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while (dmax) { *dest = L'\0'; dmax--; dest++; }
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#endif
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*err = RCNEGATE(EOK);
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return dest; /* successful return */
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}
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dmax--;
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dest++;
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src++;
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}
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}
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/*
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* the entire src must have been copied, if not reset dest
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* to null the string.
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*/
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handle_wc_error(orig_dest, orig_dmax, "wcpcpy_s: not enough space for src",
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ESNOSPC);
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*err = RCNEGATE(ESNOSPC);
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return NULL;
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}
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EXPORT_SYMBOL(wcpcpy_s)
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