mirror of
https://github.com/MariaDB/server.git
synced 2025-01-15 19:42:28 +01:00
104 lines
4 KiB
C
104 lines
4 KiB
C
/* 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);
|
|
}
|