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r_strinstr.c
Package: mysql-3.23.35.tar.gz [view]
Upload User: tsgydb
Upload Date: 2007-04-14
Package Size: 10674k
Code Size: 2k
Category:
MySQL
Development Platform:
Visual C++
- /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- MA 02111-1307, USA */
- /*
- Author : David
- strintstr(src, from, pat) looks for an instance of pat in src
- backwards from pos from. pat is not a regex(3) pattern, it is a literal
- string which must be matched exactly.
- The result 0 if the pattern was not found else it is the start char of
- the pattern counted from the begining of the string.
- */
- #include <global.h>
- #include "m_string.h"
- uint r_strinstr(reg1 my_string str,int from, reg4 my_string search)
- {
- reg2 my_string i, j;
- uint len = (uint) strlen(search);
- /* pointer to the last char of buff */
- my_string start = str + from - 1;
- /* pointer to the last char of search */
- my_string search_end = search + len - 1;
- skipp:
- while (start >= str) /* Cant be != because the first char */
- {
- if (*start-- == *search_end)
- {
- i = start; j = search_end - 1;
- while (j >= search && start > str)
- if (*i-- != *j--)
- goto skipp;
- return (uint) ((start - len) - str + 3);
- }
- }
- return (0);
- }