233 lines
7.1 KiB
C
233 lines
7.1 KiB
C
/*------------------------------------------------------------------
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* strcat_s.c
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*
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* October 2008, Bo Berry
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*
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* Copyright (c) 2008-2011 by Cisco Systems, Inc
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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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* strcat_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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* strcat_s(char *dest, rsize_t dmax, const char *src)
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*
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* DESCRIPTION
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* The strcat_s function appends a copy of the string pointed
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* to by src (including the terminating null character) to the
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* end of the string pointed to by dest. The initial character
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* from src overwrites the null character at the end ofdest.
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*
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* All elements following the terminating null character (if
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* any) written by strcat_s in the array of dmax characters
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* pointed to by dest take unspecified values when strcat_s
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* 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 extended by src
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* if dmax allows. The string is null terminated.
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* If the resulting concatenated string is less
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* than dmax, the remaining slack space is nulled.
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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 concatenaed
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* to string dest
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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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* dmax shall not equal zero
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* dmax shall not be greater than RSIZE_MAX_STR
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* dmax shall be greater than strnlen_s(src,m).
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* Copying shall not takeplace between objects that overlap
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* If there is a runtime-constraint violation, then if dest is
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* not a null pointer and dmax is greater than zero and not
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* greater than RSIZE_MAX_STR, then strcat_s nulls dest.
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*
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* RETURN VALUE
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* EOK successful operation, all the characters from src
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* were appended to dest and the result in dest is
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* null terminated.
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* ESNULLP NULL pointer
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* ESZEROL zero length
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* ESLEMAX length exceeds max
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* ESUNTERM dest not terminated
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*
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* ALSO SEE
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* strncat_s(), strcpy_s(), strncpy_s()
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*
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*/
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errno_t
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strcat_s (char *dest, rsize_t dmax, const char *src)
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{
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rsize_t orig_dmax;
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char *orig_dest;
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const char *overlap_bumper;
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if (dest == NULL) {
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invoke_safe_str_constraint_handler("strcat_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 (src == NULL) {
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invoke_safe_str_constraint_handler("strcat_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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if (dmax == 0) {
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invoke_safe_str_constraint_handler("strcat_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_STR) {
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invoke_safe_str_constraint_handler("strcat_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 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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/* Find the end of dest */
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while (*dest != '\0') {
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if (dest == overlap_bumper) {
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handle_error(orig_dest, orig_dmax, "strcat_s: "
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"overlapping objects",
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ESOVRLP);
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return RCNEGATE(ESOVRLP);
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}
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dest++;
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dmax--;
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if (dmax == 0) {
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handle_error(orig_dest, orig_dmax, "strcat_s: "
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"dest unterminated",
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ESUNTERM);
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return RCNEGATE(ESUNTERM);
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}
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}
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while (dmax > 0) {
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if (dest == overlap_bumper) {
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handle_error(orig_dest, orig_dmax, "strcat_s: "
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"overlapping objects",
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ESOVRLP);
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return RCNEGATE(ESOVRLP);
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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 to clear any data */
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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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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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/* Find the end of dest */
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while (*dest != '\0') {
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/*
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* NOTE: no need to check for overlap here since src comes first
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* in memory and we're not incrementing src here.
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*/
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dest++;
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dmax--;
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if (dmax == 0) {
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handle_error(orig_dest, orig_dmax, "strcat_s: "
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"dest unterminated",
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ESUNTERM);
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return RCNEGATE(ESUNTERM);
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}
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}
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while (dmax > 0) {
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if (src == overlap_bumper) {
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handle_error(orig_dest, orig_dmax, "strcat_s: "
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"overlapping objects",
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ESOVRLP);
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return RCNEGATE(ESOVRLP);
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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 to clear any data */
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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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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 null the string
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*/
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handle_error(orig_dest, orig_dmax, "strcat_s: not enough "
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"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(strcat_s);
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