164 lines
4.4 KiB
C
164 lines
4.4 KiB
C
/*------------------------------------------------------------------
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* strremovews_s.c
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*
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* November 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 resevered.
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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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* strremovews_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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* strremovews_s(char *dest, rsize_t dmax)
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*
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* DESCRIPTION
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* Removes beginning and trailing whitespace from the string pointed to by
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* dest by shifting the text left over writting the beginning whitespace.
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* The shifted-trimmed text is null terminated.
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*
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* The text is shifted so the original pointer can continue to be used. This
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* is useful when the memory was malloc'ed and will need to be freed.
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*
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* EXTENSION TO
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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 to remove whitespace
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*
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* dmax restricted maximum length of string
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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 0
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* dmax shall not be greater than RSIZE_MAX_STR
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* dest shall be null terminated
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*
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* RETURN VALUE
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* EOK
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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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* ESUNTERM dest was not null terminated
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*
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* SEE ALSO
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* strljustify_s(),
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*
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*/
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errno_t
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strremovews_s (char *dest, rsize_t dmax)
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{
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char *orig_dest;
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char *orig_end;
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rsize_t orig_dmax;
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if (dest == NULL) {
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invoke_safe_str_constraint_handler("strremovews_s: dest is null",
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NULL, ESNULLP);
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return (ESNULLP);
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}
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if (dmax == 0 ) {
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invoke_safe_str_constraint_handler("strremovews_s: dmax is 0",
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NULL, ESZEROL);
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return (ESZEROL);
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}
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if (dmax > RSIZE_MAX_STR) {
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invoke_safe_str_constraint_handler("strremovews_s: dmax exceeds max",
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NULL, ESLEMAX);
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return (ESLEMAX);
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}
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/*
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* corner case, a dmax of one requires a null
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*/
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if (*dest == '\0' || dmax <= RSIZE_MIN_STR) {
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*dest = '\0';
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return (EOK);
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}
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orig_dest = dest;
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orig_dmax = dmax;
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/*
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* scan the string to be sure it is properly terminated
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*/
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while (*dest) {
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if (dmax == 0) {
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while (orig_dmax) { *orig_dest++ = '\0'; orig_dmax--; }
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invoke_safe_str_constraint_handler(
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"strremovews_s: dest is unterminated",
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NULL, ESUNTERM);
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return (ESUNTERM);
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}
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dmax--;
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dest++;
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}
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/*
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* find first non-white space char
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*/
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orig_end = dest-1;
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dest = orig_dest;
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while ((*dest == ' ') || (*dest == '\t')) {
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dest++;
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}
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/*
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* shift the text over the leading spaces
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*/
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if (orig_dest != dest && *dest) {
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while (*dest) {
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*orig_dest++ = *dest;
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*dest++ = ' ';
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}
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*dest = '\0';
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}
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/*
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* strip trailing whitespace
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*/
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dest = orig_end;
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while ((*dest == ' ') || (*dest == '\t')) {
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*dest = '\0';
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dest--;
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}
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return (EOK);
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}
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