1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/* Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
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 02110-1301 USA */
#include <my_global.h>
#include "m_string.h"
#include "m_ctype.h"
/*
Return pointer to first occurrence of character in a multi-byte string
or NULL if the character doesn't appear in the multi-byte string or
invalid character in charset of multi-byte string is found.
@param cs Pointer to charset info.
@param str Pointer to start of multi-byte string.
@param end Pointer to end of multi-byte string.
@param c Character to find first occurrence of.
@return Pointer to first occurence of c in str or NULL.
*/
char *my_strchr(const CHARSET_INFO *cs, const char *str, const char *end,
pchar c)
{
while (str < end)
{
uint mbl= my_mbcharlen_ptr(cs, str, end);
if (mbl == 0)
return NULL;
if (mbl == 1)
{
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'.
@param cs Pointer to charset info.
@param str Pointer to multi-byte string.
@param str_end Pointer to end of multi-byte string.
@param reject Pointer to start of single-byte reject string.
@param reject_length Length of single-byte reject string.
@return Length of segment of multi-byte string that doesn't contain
any character of the single-byte reject string or zero if an
invalid encoding of a character of the multi-byte string is
found.
@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.
This method returns zero if an invalid encoding of any character
in the string 'str' using charset 'cs' is found.
@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(const CHARSET_INFO *cs, const char *str,
const char *str_end, const char *reject,
size_t reject_length)
{
const char *ptr_str, *ptr_reject;
const char *reject_end= reject + reject_length;
uint mbl= 0;
for (ptr_str= str; ptr_str < str_end; ptr_str+= mbl)
{
mbl= my_mbcharlen_ptr(cs, ptr_str, str_end);
if (mbl == 0)
return 0;
if (mbl == 1)
{
for (ptr_reject= reject; ptr_reject < reject_end; ++ptr_reject)
{
if (*ptr_reject == *ptr_str)
return (size_t) (ptr_str - str);
}
}
}
return (size_t) (ptr_str - str);
}
|
