1/* Copyright (C) 2000-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <stdbool.h>
19#include <wchar.h>
20#include <wctype.h>
21#include <scratch_buffer.h>
22
23#include "../locale/outdigits.h"
24#include "../locale/outdigitswc.h"
25
26static CHAR_T *
27_i18n_number_rewrite (CHAR_T *w, CHAR_T *rear_ptr, CHAR_T *end)
28{
29#ifdef COMPILE_WPRINTF
30# define decimal NULL
31# define thousands NULL
32#else
33 char decimal[MB_LEN_MAX + 1];
34 char thousands[MB_LEN_MAX + 1];
35#endif
36
37 /* "to_outpunct" is a map from ASCII decimal point and thousands-sep
38 to their equivalent in locale. This is defined for locales which
39 use extra decimal point and thousands-sep. */
40 wctrans_t map = __wctrans ("to_outpunct");
41 wint_t wdecimal = __towctrans (L'.', map);
42 wint_t wthousands = __towctrans (L',', map);
43
44#ifndef COMPILE_WPRINTF
45 if (__glibc_unlikely (map != NULL))
46 {
47 mbstate_t state;
48 memset (&state, '\0', sizeof (state));
49
50 size_t n = __wcrtomb (decimal, wdecimal, &state);
51 if (n == (size_t) -1)
52 memcpy (decimal, ".", 2);
53 else
54 decimal[n] = '\0';
55
56 memset (&state, '\0', sizeof (state));
57
58 n = __wcrtomb (thousands, wthousands, &state);
59 if (n == (size_t) -1)
60 memcpy (thousands, ",", 2);
61 else
62 thousands[n] = '\0';
63 }
64#endif
65
66 /* Copy existing string so that nothing gets overwritten. */
67 CHAR_T *src;
68 struct scratch_buffer buffer;
69 scratch_buffer_init (&buffer);
70 if (!scratch_buffer_set_array_size (&buffer, rear_ptr - w, sizeof (CHAR_T)))
71 /* If we cannot allocate the memory don't rewrite the string.
72 It is better than nothing. */
73 return w;
74 src = buffer.data;
75
76 CHAR_T *s = (CHAR_T *) __mempcpy (src, w,
77 (rear_ptr - w) * sizeof (CHAR_T));
78
79 w = end;
80
81 /* Process all characters in the string. */
82 while (--s >= src)
83 {
84 if (*s >= '0' && *s <= '9')
85 {
86 if (sizeof (CHAR_T) == 1)
87 w = (CHAR_T *) outdigit_value ((char *) w, *s - '0');
88 else
89 *--w = (CHAR_T) outdigitwc_value (*s - '0');
90 }
91 else if (__builtin_expect (map == NULL, 1) || (*s != '.' && *s != ','))
92 *--w = *s;
93 else
94 {
95 if (sizeof (CHAR_T) == 1)
96 {
97 const char *outpunct = *s == '.' ? decimal : thousands;
98 size_t dlen = strlen (outpunct);
99
100 w -= dlen;
101 while (dlen-- > 0)
102 w[dlen] = outpunct[dlen];
103 }
104 else
105 *--w = *s == '.' ? (CHAR_T) wdecimal : (CHAR_T) wthousands;
106 }
107 }
108
109 scratch_buffer_free (&buffer);
110 return w;
111}
112