str/str_str.c

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00001 // Copyright (C) 2006-2007 Benedikt Böhm <hollow@gentoo.org>
00002 //
00003 // This program is free software; you can redistribute it and/or
00004 // modify it under the terms of the GNU General Public License
00005 // as published by the Free Software Foundation; either version 2
00006 // of the License, or (at your option) any later version.
00007 //
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 //
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the Free Software
00015 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
00016 
00017 #include "mem.h"
00018 #include "str.h"
00019 
00020 char *str_str(const char *str, const char *needle)
00021 {
00022         int i;
00023         int slen = str_len(str);
00024         int nlen = str_len(needle);
00025 
00026         if (nlen < 1)
00027                 return (char *) str;
00028 
00029         if (nlen > slen)
00030                 return 0;
00031 
00032         for (i = slen - nlen + 1; i; i--) {
00033                 if (mem_cmp(str, needle, nlen) == 0)
00034                         return (char *) str;
00035 
00036                 str++;
00037         }
00038 
00039         return 0;
00040 }

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