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There's not much practial need for wchar strings (esp. 4-byte strings), but a lot for a proper and safe utf-8 string library. Recommended: ./configure --disable-wchar --enable-u8 See GH #61
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| /*------------------------------------------------------------------ | ||
| * wcscat_s.c | ||
| * | ||
| * September 2017, Reini Urban | ||
| * | ||
| * Copyright (c) 2017 by Reini Urban | ||
| * All rights reserved. | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person | ||
| * obtaining a copy of this software and associated documentation | ||
| * files (the "Software"), to deal in the Software without | ||
| * restriction, including without limitation the rights to use, | ||
| * copy, modify, merge, publish, distribute, sublicense, and/or | ||
| * sell copies of the Software, and to permit persons to whom the | ||
| * Software is furnished to do so, subject to the following | ||
| * conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be | ||
| * included in all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | ||
| * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | ||
| * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | ||
| * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | ||
| * OTHER DEALINGS IN THE SOFTWARE. | ||
| *------------------------------------------------------------------ | ||
| */ | ||
|
|
||
| #ifdef FOR_DOXYGEN | ||
| #include "safe_str_lib.h" | ||
| #else | ||
| #include "safeclib_private.h" | ||
| #endif | ||
|
|
||
| #ifdef HAVE_WCHAR_H | ||
|
|
||
| /** | ||
| * @def wcscat_s(dest,dmax,src) | ||
| * @brief | ||
| * The wcscat_s function appends a copy of the wide string pointed | ||
| * to by src (including the terminating null character) to the | ||
| * end of the wide string pointed to by dest. The initial wide character | ||
| * from src overwrites the null character at the end of dest. | ||
| * @details | ||
| * All elements following the terminating null wide character (if | ||
| * any) written by wcscat_s in the array of dmax characters | ||
| * pointed to by dest take unspecified values when wcscat_s | ||
| * returns. | ||
| * With SAFECLIB_STR_NULL_SLACK defined the rest is cleared with | ||
| * 0. | ||
| * | ||
| * @remark SPECIFIED IN | ||
| * * C11 standard (ISO/IEC 9899:2011): | ||
| * K.3.9.2.2.1 The wcscat_s function (p: 642-643) | ||
| * http://en.cppreference.com/w/c/string/wide/wcscat | ||
| * * ISO/IEC TR 24731, Programming languages, environments | ||
| * and system software interfaces, Extensions to the C Library, | ||
| * Part I: Bounds-checking interfaces | ||
| * | ||
| * @param[out] dest pointer to wide string that will be extended by src | ||
| * if dmax allows. The wide string is null terminated. | ||
| * If the resulting concatenated wide string is less | ||
| * than dmax, the remaining slack space is nulled. | ||
| * @param[in] dmax restricted maximum wchar_t length of the resulting | ||
| * dest, including the null | ||
| * @param[in] src pointer to the wide string that will be concatenaed | ||
| * to string dest | ||
| * | ||
| * @pre Neither dest nor src shall be a null pointer | ||
| * @pre dmax shall not equal zero | ||
| * @pre dmax shall not be greater than RSIZE_MAX_WSTR and size of dest | ||
| * @pre dmax shall be greater than wcsnlen_s(src,m). | ||
| * @pre Copying shall not take place between objects that overlap | ||
| * | ||
| * @note C11 uses RSIZE_MAX, not RSIZE_MAX_WSTR. | ||
| * | ||
| * @return If there is a runtime-constraint violation, then if dest is | ||
| * not a null pointer and dmax is greater than zero and not | ||
| * greater than RSIZE_MAX_WSTR, then wcscat_s nulls dest. | ||
| * @retval EOK when successful operation, all the wide characters from | ||
| * src were appended to dest and the result in dest is null terminated. | ||
| * @retval ESNULLP when dest or src is a NULL pointer | ||
| * @retval ESZEROL when dmax = 0 | ||
| * @retval ESLEMAX when dmax > RSIZE_MAX_WSTR | ||
| * @retval EOVERFLOW when dmax > size of dest (optionally, when the compiler | ||
| * knows the object_size statically) | ||
| * @retval ESLEWRNG when dmax != size of dest and --enable-error-dmax | ||
| * @retval ESUNTERM when dest not terminated in the first dmax wide | ||
| * characters | ||
| * @retval ESOVRLP when src overlaps with dest | ||
| * | ||
| * @see | ||
| * wcscat_s(), strcpy_s(), strncpy_s() | ||
| * | ||
| */ | ||
| EXPORT errno_t _wcscat_s_chk(wchar_t *restrict dest, rsize_t dmax, | ||
| const wchar_t *restrict src, | ||
| const size_t destbos) { | ||
| rsize_t orig_dmax; | ||
| wchar_t *orig_dest; | ||
| const wchar_t *overlap_bumper; | ||
| const size_t destsz = dmax * sizeof(wchar_t); | ||
|
|
||
| CHK_DEST_NULL("wcscat_s") | ||
| CHK_DMAX_ZERO("wcscat_s") | ||
| if (destbos == BOS_UNKNOWN) { | ||
| CHK_DMAX_MAX("wcscat_s", RSIZE_MAX_WSTR) | ||
| BND_CHK_PTR_BOUNDS(dest, destsz); | ||
| } else { | ||
| CHK_DESTW_OVR("wcscat_s", destsz, destbos) | ||
| } | ||
| CHK_SRCW_NULL_CLEAR("wcscat_s", src) | ||
|
|
||
| /* hold base of dest in case src was not copied */ | ||
| orig_dmax = dmax; | ||
| orig_dest = dest; | ||
|
|
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| if (dest < src) { | ||
| overlap_bumper = src; | ||
|
|
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| /* Find the end of dest */ | ||
| while (*dest != L'\0') { | ||
|
|
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| if (unlikely(dest == overlap_bumper)) { | ||
| handle_werror(orig_dest, orig_dmax, | ||
| "wcscat_s: " | ||
| "overlapping objects", | ||
| ESOVRLP); | ||
| return RCNEGATE(ESOVRLP); | ||
| } | ||
|
|
||
| dest++; | ||
| dmax--; | ||
| if (unlikely(dmax == 0)) { | ||
| handle_werror(orig_dest, orig_dmax, | ||
| "wcscat_s: " | ||
| "dest unterminated", | ||
| ESUNTERM); | ||
| return RCNEGATE(ESUNTERM); | ||
| } | ||
| } | ||
|
|
||
| while (dmax > 0) { | ||
| if (unlikely(dest == overlap_bumper)) { | ||
| handle_werror(orig_dest, orig_dmax, | ||
| "wcscat_s: " | ||
| "overlapping objects", | ||
| ESOVRLP); | ||
| return RCNEGATE(ESOVRLP); | ||
| } | ||
|
|
||
| *dest = *src; | ||
| if (unlikely(*dest == L'\0')) { | ||
| #ifdef SAFECLIB_STR_NULL_SLACK | ||
| /* null slack to clear any data */ | ||
| if (dmax > 0x20) | ||
| memset(dest, 0, dmax * sizeof(wchar_t)); | ||
| else { | ||
| while (dmax) { | ||
| *dest = L'\0'; | ||
| dmax--; | ||
| dest++; | ||
| } | ||
| } | ||
| #endif | ||
| return RCNEGATE(EOK); | ||
| } | ||
|
|
||
| dmax--; | ||
| dest++; | ||
| src++; | ||
| } | ||
| } else { | ||
| overlap_bumper = dest; | ||
|
|
||
| /* Find the end of dest */ | ||
| while (*dest != L'\0') { | ||
|
|
||
| /* | ||
| * NOTE: no need to check for overlap here since src comes first | ||
| * in memory and we're not incrementing src here. | ||
| */ | ||
| dest++; | ||
| dmax--; | ||
| if (unlikely(dmax == 0)) { | ||
| handle_werror(orig_dest, orig_dmax, | ||
| "wcscat_s: " | ||
| "dest unterminated", | ||
| ESUNTERM); | ||
| return RCNEGATE(ESUNTERM); | ||
| } | ||
| } | ||
|
|
||
| while (dmax > 0) { | ||
| if (unlikely(src == overlap_bumper)) { | ||
| handle_werror(orig_dest, orig_dmax, | ||
| "wcscat_s: " | ||
| "overlapping objects", | ||
| ESOVRLP); | ||
| return RCNEGATE(ESOVRLP); | ||
| } | ||
|
|
||
| *dest = *src; | ||
| if (*dest == L'\0') { | ||
| #ifdef SAFECLIB_STR_NULL_SLACK | ||
| /* null slack to clear any data */ | ||
| if (dmax > 0x20) | ||
| memset(dest, 0, dmax * sizeof(wchar_t)); | ||
| else { | ||
| while (dmax) { | ||
| *dest = L'\0'; | ||
| dmax--; | ||
| dest++; | ||
| } | ||
| } | ||
| #endif | ||
| return RCNEGATE(EOK); | ||
| } | ||
|
|
||
| dmax--; | ||
| dest++; | ||
| src++; | ||
| } | ||
| } | ||
|
|
||
| /* | ||
| * the entire src was not copied, so null the string | ||
| */ | ||
| handle_werror(orig_dest, orig_dmax, | ||
| "wcscat_s: not enough " | ||
| "space for src", | ||
| ESNOSPC); | ||
|
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| return RCNEGATE(ESNOSPC); | ||
| } | ||
|
|
||
| #endif /* HAVE_WCHAR_H */ |
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