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utl_memStr()

The utl_memStr static function.

Example Usage
char cpLine = "1234567890abcdefghijklmnopqrstuvwxyz"; / length=36 / char cpSearch = "90abc"; char cpRv; cpRv = utl_memStr(cpLine, 36, cpSearch, strlen(cpSearch)); / * Returns the address of "90abc" in the original string / cpRv = utl_memStr(cpLine, 10, cpSearch, strlen(cpSearch)); / * Returns NULL */

Source Code

/**
* Copyright (c) 2008, Corey's Consulting LLC. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/******************************************************************************

utl_memStr()

This function works similarly to the strstr() function, except it works
on data which is not null terminated.

Parameters:
cpSearch i: data to search
iLenSearch i: length of data pointed to by cpData
cpWanted i: data wanted
iLenWanted i: length of data wanted

Returns:
NULL: wanted sequence not found in search data
addr: found; address is location in cpSearch (NOT an offset)

****/
static char *
utl_memStr(char *cpSearch, int iLenSearch, char *cpWanted, int iLenWanted)
{
char *cpRetVal = NULL;
int iOffset;
int iMax = iLenSearch - iLenWanted;

for (iOffset = 0; iOffset <= iMax; iOffset++)
{
if (memcmp(cpSearch + iOffset, cpWanted, iLenWanted) == 0)
{
// found
cpRetVal = cpSearch + iOffset;
break;
}
}

return(cpRetVal);
} // end utl_memStr()

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