1 /* Internal header for proving correct grouping in strings of numbers.
2 Copyright (C) 1995-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
24 #define MAX(a,b) ({ typeof(a) _a = (a); typeof(b) _b = (b); \
31 # define UCHAR_TYPE wint_t
32 # define STRING_TYPE wchar_t
35 # define UCHAR_TYPE unsigned char
36 # define STRING_TYPE char
41 /* Find the maximum prefix of the string between BEGIN and END which
42 satisfies the grouping rules. It is assumed that at least one digit
43 follows BEGIN directly. */
47 __correctly_grouped_prefixwc (const STRING_TYPE
*begin
, const STRING_TYPE
*end
,
50 __correctly_grouped_prefixmb (const STRING_TYPE
*begin
, const STRING_TYPE
*end
,
51 const char *thousands
,
59 size_t thousands_len
= 1;
61 size_t thousands_len
= strlen (thousands
);
65 while (end
- begin
>= thousands_len
)
67 const STRING_TYPE
*cp
= end
- thousands_len
;
68 const char *gp
= grouping
;
70 /* Check first group. */
77 if (cp
[thousands_len
- 1] == *thousands
)
79 for (cnt
= 1; thousands
[cnt
] != '\0'; ++cnt
)
80 if (thousands
[cnt
] != cp
[thousands_len
- 1 - cnt
])
82 if (thousands
[cnt
] == '\0')
89 /* We allow the representation to contain no grouping at all even if
90 the locale specifies we can have grouping. */
94 if (end
- cp
== (int) *gp
+ 1)
96 /* This group matches the specification. */
98 const STRING_TYPE
*new_end
;
101 /* There is just one complete group. We are done. */
104 /* CP points to a thousands separator character. The preceding
105 remainder of the string from BEGIN to NEW_END is the part we
106 will consider if there is a grouping error in this trailing
107 portion from CP to END. */
110 /* Loop while the grouping is correct. */
113 /* Get the next grouping rule. */
116 /* If end is reached use last rule. */
119 /* Skip the thousands separator. */
128 /* No more thousands separators are allowed to follow. */
132 if (*cp
== thousands
)
135 for (cnt
= 0; thousands
[cnt
] != '\0'; ++cnt
)
136 if (thousands
[cnt
] != cp
[thousands_len
- cnt
- 1])
138 if (thousands
[cnt
] == '\0')
145 /* OK, only digits followed. */
150 /* Check the next group. */
151 const STRING_TYPE
*group_end
= cp
;
156 if (*cp
== thousands
)
159 for (cnt
= 0; thousands
[cnt
] != '\0'; ++cnt
)
160 if (thousands
[cnt
] != cp
[thousands_len
- cnt
- 1])
162 if (thousands
[cnt
] == '\0')
168 if (cp
< begin
&& group_end
- cp
<= (int) *gp
)
169 /* Final group is correct. */
172 if (cp
< begin
|| group_end
- cp
!= (int) *gp
)
173 /* Incorrect group. Punt. */
178 /* The trailing portion of the string starting at NEW_END
179 contains a grouping error. So we will look for a correctly
180 grouped number in the preceding portion instead. */
185 /* Even the first group was wrong; determine maximum shift. */
186 if (end
- cp
> (int) *gp
+ 1)
187 end
= cp
+ (int) *gp
+ 1;
189 /* This number does not fill the first group, but is correct. */
192 /* CP points to a thousands separator character. */
197 return MAX (begin
, end
);