1/* Copyright (C) 2000, 2004, 2008 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
19
20/* Look up the value of the next multibyte character and return its numerical
21 value if it is one of the digits known in the locale. If *DECIDED is
22 -1 this means it is not yet decided which form it is and we have to
23 search through all available digits. Otherwise we know which script
24 the digits are from. */
25static inline char *
26outdigit_value (char *s, int n)
27{
28 const char *outdigit;
29 size_t dlen;
30
31 assert (0 <= n && n <= 9);
32 outdigit = nl_langinfo (_NL_CTYPE_OUTDIGIT0_MB + n);
33 dlen = strlen (outdigit);
34
35 s -= dlen;
36 while (dlen-- > 0)
37 s[dlen] = outdigit[dlen];
38
39 return s;
40}
41
42/* Look up the value of the next multibyte character and return its numerical
43 value if it is one of the digits known in the locale. If *DECIDED is
44 -1 this means it is not yet decided which form it is and we have to
45 search through all available digits. Otherwise we know which script
46 the digits are from. */
47static inline wchar_t
48outdigitwc_value (int n)
49{
50 assert (0 <= n && n <= 9);
51
52 return nl_langinfo_wc (_NL_CTYPE_OUTDIGIT0_WC + n);
53}
54
55static char *
56_i18n_number_rewrite (char *w, char *rear_ptr, char *end)
57{
58 char decimal[MB_LEN_MAX + 1];
59 char thousands[MB_LEN_MAX + 1];
60
61 /* "to_outpunct" is a map from ASCII decimal point and thousands-sep
62 to their equivalent in locale. This is defined for locales which
63 use extra decimal point and thousands-sep. */
64 wctrans_t map = wctrans ("to_outpunct");
65 wint_t wdecimal = towctrans (L_('.'), map);
66 wint_t wthousands = towctrans (L_(','), map);
67
68 if (__builtin_expect (map != NULL, 0))
69 {
70 mbstate_t state;
71 memset (&state, '\0', sizeof (state));
72
73 size_t n = wcrtomb (decimal, wdecimal, &state);
74 if (n == (size_t) -1)
75 memcpy (decimal, ".", 2);
76 else
77 decimal[n] = '\0';
78
79 memset (&state, '\0', sizeof (state));
80
81 n = wcrtomb (thousands, wthousands, &state);
82 if (n == (size_t) -1)
83 memcpy (thousands, ",", 2);
84 else
85 thousands[n] = '\0';
86 }
87
88 /* Copy existing string so that nothing gets overwritten. */
89 char *src;
90 int use_alloca = (rear_ptr - w) < 4096;
91 if (__builtin_expect (use_alloca, 1))
92 src = (char *) alloca (rear_ptr - w);
93 else
94 {
95 src = (char *) malloc (rear_ptr - w);
96 if (src == NULL)
97 /* If we cannot allocate the memory don't rewrite the string.
98 It is better than nothing. */
99 return w;
100 }
101
102 memcpy (src, w, rear_ptr - w);
103 char *s = src + (rear_ptr - w);
104
105 w = end;
106
107 /* Process all characters in the string. */
108 while (--s >= src)
109 {
110 if (*s >= '0' && *s <= '9')
111 {
112 if (sizeof (char) == 1)
113 w = (char *) outdigit_value ((char *) w, *s - '0');
114 else
115 *--w = (char) outdigitwc_value (*s - '0');
116 }
117 else if (__builtin_expect (map == NULL, 1) || (*s != '.' && *s != ','))
118 *--w = *s;
119 else
120 {
121 if (sizeof (char) == 1)
122 {
123 const char *outpunct = *s == '.' ? decimal : thousands;
124 size_t dlen = strlen (outpunct);
125
126 w -= dlen;
127 while (dlen-- > 0)
128 w[dlen] = outpunct[dlen];
129 }
130 else
131 *--w = *s == '.' ? (char) wdecimal : (char) wthousands;
132 }
133 }
134
135 if (! use_alloca)
136 free (src);
137
138 return w;
139}
140