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1 | /* Copyright (C) 2000-2015 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Ulrich Drepper <drepper@gnu.org>, 2000. | |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <stdbool.h> | |
20 | #include <wchar.h> | |
21 | #include <wctype.h> | |
22 | ||
23 | #include "../locale/outdigits.h" | |
24 | #include "../locale/outdigitswc.h" | |
25 | ||
26 | static 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 | bool use_alloca = __libc_use_alloca ((rear_ptr - w) * sizeof (CHAR_T)); | |
69 | if (__builtin_expect (use_alloca, true)) | |
70 | src = (CHAR_T *) alloca ((rear_ptr - w) * sizeof (CHAR_T)); | |
71 | else | |
72 | { | |
73 | src = (CHAR_T *) malloc ((rear_ptr - w) * sizeof (CHAR_T)); | |
74 | if (src == NULL) | |
75 | /* If we cannot allocate the memory don't rewrite the string. | |
76 | It is better than nothing. */ | |
77 | return w; | |
78 | } | |
79 | ||
80 | CHAR_T *s = (CHAR_T *) __mempcpy (src, w, | |
81 | (rear_ptr - w) * sizeof (CHAR_T)); | |
82 | ||
83 | w = end; | |
84 | ||
85 | /* Process all characters in the string. */ | |
86 | while (--s >= src) | |
87 | { | |
88 | if (*s >= '0' && *s <= '9') | |
89 | { | |
90 | if (sizeof (CHAR_T) == 1) | |
91 | w = (CHAR_T *) outdigit_value ((char *) w, *s - '0'); | |
92 | else | |
93 | *--w = (CHAR_T) outdigitwc_value (*s - '0'); | |
94 | } | |
95 | else if (__builtin_expect (map == NULL, 1) || (*s != '.' && *s != ',')) | |
96 | *--w = *s; | |
97 | else | |
98 | { | |
99 | if (sizeof (CHAR_T) == 1) | |
100 | { | |
101 | const char *outpunct = *s == '.' ? decimal : thousands; | |
102 | size_t dlen = strlen (outpunct); | |
103 | ||
104 | w -= dlen; | |
105 | while (dlen-- > 0) | |
106 | w[dlen] = outpunct[dlen]; | |
107 | } | |
108 | else | |
109 | *--w = *s == '.' ? (CHAR_T) wdecimal : (CHAR_T) wthousands; | |
110 | } | |
111 | } | |
112 | ||
113 | if (! use_alloca) | |
114 | free (src); | |
115 | ||
116 | return w; | |
117 | } |