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50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/*
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Author : David
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strintstr(src, from, pat) looks for an instance of pat in src
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backwards from pos from. pat is not a regex(3) pattern, it is a literal
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string which must be matched exactly.
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The result 0 if the pattern was not found else it is the start char of
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the pattern counted from the begining of the string.
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*/
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#include <my_global.h>
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#include "m_string.h"
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size_t r_strinstr(reg1 const char * str, size_t from, reg4 const char * search)
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{
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reg2 const char *i, *j;
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size_t len = strlen(search);
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/* pointer to the last char of buff */
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const char * start = str + from - 1;
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/* pointer to the last char of search */
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const char * search_end = search + len - 1;
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skip:
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while (start >= str) /* Cant be != because the first char */
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{
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if (*start-- == *search_end)
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{
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i = start; j = search_end - 1;
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while (j >= search && start > str)
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if (*i-- != *j--)
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goto skip;
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return (size_t) ((start - len) - str + 3);
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}
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}
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return (0);
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}
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