strcasestr.c 1.78 KB
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/*****************************************************************************
 * strcasestr.c: GNU strcasestr() replacement
 *****************************************************************************
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 * Copyright © 2002-2011 VLC authors and VideoLAN
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 *
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 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
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 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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Jean-Baptiste Kempf committed
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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 * GNU Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <string.h>
#include <ctype.h>
#include <assert.h>

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char *strcasestr (const char *psz_big, const char *psz_little)
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{
    char *p_pos = (char *)psz_big;

    if( !*psz_little ) return p_pos;

    while( *p_pos )
    {
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        if( toupper( (unsigned char)*p_pos ) == toupper( (unsigned char)*psz_little ) )
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        {
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            char *cur1 = p_pos + 1;
            char *cur2 = (char *)psz_little + 1;
            while( *cur1 && *cur2
             && toupper( (unsigned char)*cur1 ) == toupper( (unsigned char)*cur2 ) )
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            {
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                cur1++;
                cur2++;
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            }
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            if( !*cur2 ) return p_pos;
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        }
        p_pos++;
    }
    return NULL;
}