mirror of https://github.com/citusdata/citus.git
242 lines
7.7 KiB
C
242 lines
7.7 KiB
C
/*------------------------------------------------------------------
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* wcsncpy_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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* wcsncpy_s
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*
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* SYNOPSIS
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* #include "safe_str_lib.h"
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* errno_t
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* wcsncpy_s(wchar_t* dest, rsize_t dmax, const wchar_t* src, rsize_t slen)
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*
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* DESCRIPTION
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* The wcsncpy_s function copies not more than slen successive characters
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* (characters that follow a null character are not copied) from the
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* array pointed to by src to the array pointed to by dest. If no null
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* character was copied from src, then dest[slen] is set to a null character.
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*
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* All elements following the terminating null character (if any)
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* written by wcsncpy_s in the array of dmax characters pointed to
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* by dest take on the null value when wcsncpy_s returns.
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*
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* When SAFECLIB_STR_NULL_SLACK is defined to be true (#DEFINE), then
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* the dest array is filled with NULL characters following the end of
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* the last non-NULL character from src. While this is more secure, it
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* is also incurs a performance penalty, especially when the same dest
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* array is used multiple times to string manipulation routines in this
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* library. If this extra security is not required, ensure that the
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* library is compiled without #DEFINE SAFECLIB_STR_NULL_SLACK.
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*
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* Specicified in:
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* ISO/IEC TR 24731-1, 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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* The resulting string is null terminated.
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*
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* dmax restricted maximum length of the resulting dest,
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* including the null
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*
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* src pointer to the string that will be copied
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* to string dest
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*
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* slen the maximum number of characters to copy from src
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*
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* OUTPUT PARAMETERS
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* dest updated with src string
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*
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* RUNTIME CONSTRAINTS
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* Neither dmax nor slen shall be equal to zero.
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* Neither dmax nor slen shall be equal zero.
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* Neither dmax nor slen shall be greater than RSIZE_MAX_STR.
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* If slen is either greater than or equal to dmax, then dmax
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* should be more 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 dmax greater than RSIZE_MAX_STR,
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* then strncpy_s nulls dest.
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*
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* RETURN VALUE
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* EOK successful operation, the characters in src were copied
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* to 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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* ALSO SEE
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* strcat_s(), strncat_s(), strcpy_s()
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* wcscat_s(), wcsncat_s(), wcscpy_s()
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*-
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*/
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errno_t
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wcsncpy_s(wchar_t* dest, rsize_t dmax, const wchar_t* src, rsize_t slen)
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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("wcsncpy_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_str_constraint_handler("wcsncpy_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*sizeof(wchar_t) > RSIZE_MAX_STR) {
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invoke_safe_str_constraint_handler("wcsncpy_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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/* hold base 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 (src == NULL) {
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handle_wc_error(orig_dest, orig_dmax, "wcsncpy_s: src is null",
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ESNULLP);
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return RCNEGATE(ESNULLP);
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}
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if (slen == 0) {
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handle_wc_error(orig_dest, orig_dmax, "wcsncpy_s: slen is zero",
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ESZEROL);
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return RCNEGATE(ESZEROL);
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}
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if (slen*sizeof(wchar_t) > RSIZE_MAX_STR) {
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handle_wc_error(orig_dest, orig_dmax, "wcsncpy_s: slen exceeds max",
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ESLEMAX);
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return RCNEGATE(ESLEMAX);
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}
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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, "wcsncpy_s: overlapping objects",
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ESOVRLP);
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return RCNEGATE(ESOVRLP);
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}
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if (slen == 0) {
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/*
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* Copying truncated to slen chars. Note that the TR says to
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* copy slen chars plus the null char. We null the slack.
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*/
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#ifdef SAFECLIB_STR_NULL_SLACK
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while (dmax) { *dest = '\0'; dmax--; dest++; }
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#else
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*dest = '\0';
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#endif
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return RCNEGATE(EOK);
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}
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*dest = *src;
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if (*dest == '\0') {
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#ifdef SAFECLIB_STR_NULL_SLACK
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/* null slack */
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while (dmax) { *dest = '\0'; dmax--; dest++; }
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#endif
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return RCNEGATE(EOK);
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}
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dmax--;
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slen--;
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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, "wcsncpy_s: overlapping objects",
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ESOVRLP);
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return RCNEGATE(ESOVRLP);
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}
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if (slen == 0) {
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/*
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* Copying truncated to slen chars. Note that the TR says to
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* copy slen chars plus the null char. We null the slack.
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*/
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#ifdef SAFECLIB_STR_NULL_SLACK
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while (dmax) { *dest = '\0'; dmax--; dest++; }
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#else
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*dest = '\0';
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#endif
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return RCNEGATE(EOK);
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}
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*dest = *src;
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if (*dest == '\0') {
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#ifdef SAFECLIB_STR_NULL_SLACK
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/* null slack */
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while (dmax) { *dest = '\0'; dmax--; dest++; }
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#endif
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return RCNEGATE(EOK);
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}
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dmax--;
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slen--;
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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 was not copied, so zero the string
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*/
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handle_wc_error(orig_dest, orig_dmax, "wcsncpy_s: not enough space for src",
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ESNOSPC);
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return RCNEGATE(ESNOSPC);
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}
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EXPORT_SYMBOL(wcsncpy_s)
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