91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/*
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* $Source$
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* $Revision$
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* $Date$
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*
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* Copyright (c) 1996-99 by Peter Simons <simons@cys.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Peter Simons.
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*
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string.h>
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#include "text.h"
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/* A simple text search.
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This function performs a simple, case-independent text search in
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the indicated buffer.
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RETURNS: FindString() returns a pointer to the first occurance of
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"string" in "buffer", or NULL, if the string was not found.
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NOTE: This routine will perform poorly on larger text buffers.
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AUTHOR: Peter Simons <simons@rhein.de>
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*/
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char *
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text_find_string(char * buffer, /* text buffer */
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char * string /* string to find */
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)
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{
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int buffer_len;
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int string_len;
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char * result;
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/* Sanity checks. */
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assert(buffer != NULL);
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assert(string != NULL);
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if (!buffer || !string)
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return NULL;
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buffer_len = strlen(buffer);
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string_len = strlen(string);
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if (buffer_len == 0 || buffer_len < string_len)
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return NULL;
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if (string_len == 0)
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return buffer;
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/* Now look for the string. */
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for(result = NULL; buffer_len >= string_len; buffer++, buffer_len--) {
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if (!strncasecmp(buffer, string, string_len)) {
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result = buffer;
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break;
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}
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}
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return result;
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}
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