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104 lines
4 KiB
C
104 lines
4 KiB
C
/* Copyright (c) 2005, 2011, Oracle and/or its affiliates.
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Copyright (c) 2009, 2020, MariaDB Corporation.
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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#include "strings_def.h"
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#include <m_ctype.h>
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#define NEQ(A, B) ((A) != (B))
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#define EQU(A, B) ((A) == (B))
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/**
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Macro for the body of the string scanning.
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@param CS The character set of the string
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@param STR Pointer to beginning of string
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@param END Pointer to one-after-end of string
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@param ACC Pointer to beginning of accept (or reject) string
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@param LEN Length of accept (or reject) string
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@param CMP is a function-like for doing the comparison of two characters.
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*/
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#define SCAN_STRING(CS, STR, END, ACC, LEN, CMP) \
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do { \
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uint mbl; \
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const char *ptr_str, *ptr_acc; \
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const char *acc_end= (ACC) + (LEN); \
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for (ptr_str= (STR) ; ptr_str < (END) ; ptr_str+= mbl) \
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{ \
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mbl= my_ci_charlen_fix((CS), (const uchar *) ptr_str, \
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(const uchar *) (END)); \
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if (mbl < 2) \
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{ \
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DBUG_ASSERT(mbl == 1); \
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for (ptr_acc= (ACC) ; ptr_acc < acc_end ; ++ptr_acc) \
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if (CMP(*ptr_acc, *ptr_str)) \
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goto end; \
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} \
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} \
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end: \
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return (size_t) (ptr_str - (STR)); \
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} while (0)
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/*
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my_strchr(cs, str, end, c) returns a pointer to the first place in
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str where c (1-byte character) occurs, or NULL if c does not occur
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in str. This function is multi-byte safe.
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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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*/
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char *my_strchr(CHARSET_INFO *cs, const char *str, const char *end,
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pchar c)
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{
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while (str < end)
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{
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uint mbl= my_ismbchar(cs, str, end);
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if (mbl < 2)
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{
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if (*str == c)
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return((char *)str);
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str++;
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}
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else
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str+= mbl;
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}
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return(0);
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}
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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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@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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@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(CHARSET_INFO *cs, const char *str, const char *str_end,
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const char *reject)
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{
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SCAN_STRING(cs, str, str_end, reject, strlen(reject), EQU);
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}
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