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/* Copyright (c) 2005, 2011, Oracle and/or its affiliates.
Copyright (c) 2009, 2020, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#include "strings_def.h"
#include <m_ctype.h>
#define NEQ(A, B) ((A) != (B))
#define EQU(A, B) ((A) == (B))
/**
Macro for the body of the string scanning.
@param CS The character set of the string
@param STR Pointer to beginning of string
@param END Pointer to one-after-end of string
@param ACC Pointer to beginning of accept (or reject) string
@param LEN Length of accept (or reject) string
@param CMP is a function-like for doing the comparison of two characters.
*/
#define SCAN_STRING(CS, STR, END, ACC, LEN, CMP) \
do { \
uint mbl; \
const char *ptr_str, *ptr_acc; \
const char *acc_end= (ACC) + (LEN); \
for (ptr_str= (STR) ; ptr_str < (END) ; ptr_str+= mbl) \
{ \
mbl= my_ci_charlen_fix((CS), (const uchar *) ptr_str, \
(const uchar *) (END)); \
if (mbl < 2) \
{ \
DBUG_ASSERT(mbl == 1); \
for (ptr_acc= (ACC) ; ptr_acc < acc_end ; ++ptr_acc) \
if (CMP(*ptr_acc, *ptr_str)) \
goto end; \
} \
} \
end: \
return (size_t) (ptr_str - (STR)); \
} while (0)
/*
my_strchr(cs, str, end, c) returns a pointer to the first place in
str where c (1-byte character) occurs, or NULL if c does not occur
in str. This function is multi-byte safe.
TODO: should be moved to CHARSET_INFO if it's going to be called
frequently.
*/
char *my_strchr(CHARSET_INFO *cs, const char *str, const char *end,
pchar c)
{
while (str < end)
{
uint mbl= my_ismbchar(cs, str, end);
if (mbl < 2)
{
if (*str == c)
return((char *)str);
str++;
}
else
str+= mbl;
}
return(0);
}
/**
Calculate the length of the initial segment of 'str' which consists
entirely of characters not in 'reject'.
@note The reject string points to single-byte characters so it is
only possible to find the first occurrence of a single-byte
character. Multi-byte characters in 'str' are treated as not
matching any character in the reject string.
@todo should be moved to CHARSET_INFO if it's going to be called
frequently.
@internal The implementation builds on the assumption that 'str' is long,
while 'reject' is short. So it compares each character in string
with the characters in 'reject' in a tight loop over the characters
in 'reject'.
*/
size_t my_strcspn(CHARSET_INFO *cs, const char *str, const char *str_end,
const char *reject)
{
SCAN_STRING(cs, str, str_end, reject, strlen(reject), EQU);
}
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