safec
2.1
Safe C Library - ISO TR24731 Bounds Checking Interface
strcasestr_s.c
Go to the documentation of this file.
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/*------------------------------------------------------------------
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* strcasestr_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 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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errno_t
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strcasestr_s
(
char
*dest, rsize_t dmax,
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const
char
*src, rsize_t slen,
char
**substring)
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{
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rsize_t len;
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rsize_t dlen;
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int
i;
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if
(substring == NULL) {
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invoke_safe_str_constraint_handler
(
"strcasestr_s: substring is null"
,
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NULL, ESNULLP);
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return
(ESNULLP);
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}
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*substring = NULL;
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if
(dest == NULL) {
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invoke_safe_str_constraint_handler
(
"strcasestr_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
(
"strcasestr_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
(
"strcasestr_s: dmax exceeds max"
,
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NULL, ESLEMAX);
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return
(ESLEMAX);
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}
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if
(src == NULL) {
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invoke_safe_str_constraint_handler
(
"strcasestr_s: src is null"
,
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NULL, ESNULLP);
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return
(ESNULLP);
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}
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if
(slen == 0) {
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invoke_safe_str_constraint_handler
(
"strcasestr_s: slen is 0"
,
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NULL, ESZEROL);
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return
(ESZEROL);
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}
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if
(slen > RSIZE_MAX_STR) {
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invoke_safe_str_constraint_handler
(
"strcasestr_s: slen 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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* src points to a string with zero length, or
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* src equals dest, return dest
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*/
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if
(*src ==
'\0'
|| dest == src) {
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*substring = dest;
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return
(EOK);
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}
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while
(*dest && dmax) {
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i = 0;
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len = slen;
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dlen = dmax;
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while
(dest[i] && dlen) {
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/* not a match, not a substring */
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if
(toupper(dest[i]) != toupper(src[i])) {
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break
;
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}
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/* move to the next char */
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i++;
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len--;
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dlen--;
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if
(src[i] ==
'\0'
|| !len) {
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*substring = dest;
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return
(EOK);
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}
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}
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dest++;
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dmax--;
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}
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/*
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* substring was not found, return NULL
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*/
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*substring = NULL;
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return
(ESNOTFND);
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}
strcasestr_s
errno_t strcasestr_s(char *dest, rsize_t dmax, const char *src, rsize_t slen, char **substring)
The strcasestr_s() function locates the first occurrence of the substring pointed to by src which wou...
Definition:
strcasestr_s.c:70
invoke_safe_str_constraint_handler
void invoke_safe_str_constraint_handler(const char *msg, void *ptr, errno_t error)
Invokes the currently set constraint handler or the default.
Definition:
safe_str_constraint.c:99
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