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83 lines
3.4 KiB
83 lines
3.4 KiB
5 months ago
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/* Copyright (c) 2005, 2018, 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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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Without limiting anything contained in the foregoing, this file,
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which is part of C Driver for MySQL (Connector/C), is also subject to the
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Universal FOSS Exception, version 1.0, a copy of which can be found at
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http://oss.oracle.com/licenses/universal-foss-exception.
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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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include <stddef.h>
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#include <sys/types.h>
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#include "m_ctype.h"
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/**
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Calculate the length of the initial segment of 'str' which consists
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entirely of characters not in 'reject'.
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@param cs Pointer to charset info.
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@param str Pointer to multi-byte string.
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@param str_end Pointer to end of multi-byte string.
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@param reject Pointer to start of single-byte reject string.
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@param reject_length Length of single-byte reject string.
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@return Length of segment of multi-byte string that doesn't contain
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any character of the single-byte reject string or zero if an
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invalid encoding of a character of the multi-byte string is
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found.
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@note The reject string points to single-byte characters so it is
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only possible to find the first occurrence of a single-byte
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character. Multi-byte characters in 'str' are treated as not
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matching any character in the reject string.
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This method returns zero if an invalid encoding of any character
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in the string 'str' using charset 'cs' is found.
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@todo should be moved to CHARSET_INFO if it's going to be called
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frequently.
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@internal The implementation builds on the assumption that 'str' is long,
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while 'reject' is short. So it compares each character in string
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with the characters in 'reject' in a tight loop over the characters
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in 'reject'.
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*/
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size_t my_strcspn(const CHARSET_INFO *cs, const char *str, const char *str_end,
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const char *reject, size_t reject_length) {
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const char *ptr_str, *ptr_reject;
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const char *reject_end = reject + reject_length;
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uint mbl = 0;
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for (ptr_str = str; ptr_str < str_end; ptr_str += mbl) {
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mbl = my_mbcharlen_ptr(cs, ptr_str, str_end);
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if (mbl == 0) return 0;
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if (mbl == 1) {
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for (ptr_reject = reject; ptr_reject < reject_end; ++ptr_reject) {
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if (*ptr_reject == *ptr_str) return (size_t)(ptr_str - str);
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}
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}
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}
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return (size_t)(ptr_str - str);
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}
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