113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
/*------------------------------------------------------------------
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* strnterminate_s.c
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*
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* February 2011, Bo Berry
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*
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* Copyright (c) 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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* strnterminate_s
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*
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* SYNOPSIS
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* #include "safe_str_lib.h"
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* rsize_t
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* strnterminate_s(char *dest, rsize_t dmax)
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*
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* DESCRIPTION
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* The strnterminate_s function will terminate the string if a
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* null is not encountered before dmax characters.
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*
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* EXTENSION TO
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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
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*
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* dmax - restricted maximum length
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*
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* OUTPUT PARAMETERS
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* dest - dest is terminated if needed
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*
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* RUNTIME CONSTRAINTS
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* dest shall not 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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*
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* RETURN VALUE
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* The function returns a terminated string. If a null is not
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* encountered prior to dmax characters, the dmax character is
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* set to null terminating the string. The string length is
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* also returned.
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*
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* ALSO SEE
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* strnlen_s()
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*
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*/
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rsize_t
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strnterminate_s (char *dest, rsize_t dmax)
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{
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rsize_t count;
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if (dest == NULL) {
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return (0);
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}
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if (dmax == 0) {
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invoke_safe_str_constraint_handler("strnterminate_s: dmax is 0",
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NULL, ESZEROL);
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return (0);
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}
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if (dmax > RSIZE_MAX_STR) {
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invoke_safe_str_constraint_handler("strnterminate_s: dmax exceeds max",
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NULL, ESLEMAX);
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return (0);
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}
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count = 0;
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while (dmax > 1) {
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if (*dest) {
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count++;
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dmax--;
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dest++;
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} else {
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break;
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}
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}
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*dest = '\0';
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return (count);
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}
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