Viewing file:  _i18n_number.h (4 KB) -rw-r--r--
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/* Copyright (C) 2000, 2004, 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.org>, 2000.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* Look up the value of the next multibyte character and return its numerical
value if it is one of the digits known in the locale. If *DECIDED is
-1 this means it is not yet decided which form it is and we have to
search through all available digits. Otherwise we know which script
the digits are from. */
static inline char *
outdigit_value (char *s, int n)
{
const char *outdigit;
size_t dlen;
assert (0 <= n && n <= 9);
outdigit = nl_langinfo (_NL_CTYPE_OUTDIGIT0_MB + n);
dlen = strlen (outdigit);
s -= dlen;
while (dlen-- > 0)
s[dlen] = outdigit[dlen];
return s;
}
/* Look up the value of the next multibyte character and return its numerical
value if it is one of the digits known in the locale. If *DECIDED is
-1 this means it is not yet decided which form it is and we have to
search through all available digits. Otherwise we know which script
the digits are from. */
static inline wchar_t
outdigitwc_value (int n)
{
assert (0 <= n && n <= 9);
return nl_langinfo_wc (_NL_CTYPE_OUTDIGIT0_WC + n);
}
static char *
_i18n_number_rewrite (char *w, char *rear_ptr, char *end)
{
char decimal[MB_LEN_MAX + 1];
char thousands[MB_LEN_MAX + 1];
/* "to_outpunct" is a map from ASCII decimal point and thousands-sep
to their equivalent in locale. This is defined for locales which
use extra decimal point and thousands-sep. */
wctrans_t map = wctrans ("to_outpunct");
wint_t wdecimal = towctrans (L_('.'), map);
wint_t wthousands = towctrans (L_(','), map);
if (__builtin_expect (map != NULL, 0))
{
mbstate_t state;
memset (&state, '\0', sizeof (state));
size_t n = wcrtomb (decimal, wdecimal, &state);
if (n == (size_t) -1)
memcpy (decimal, ".", 2);
else
decimal[n] = '\0';
memset (&state, '\0', sizeof (state));
n = wcrtomb (thousands, wthousands, &state);
if (n == (size_t) -1)
memcpy (thousands, ",", 2);
else
thousands[n] = '\0';
}
/* Copy existing string so that nothing gets overwritten. */
char *src;
int use_alloca = (rear_ptr - w) < 4096;
if (__builtin_expect (use_alloca, 1))
src = (char *) alloca (rear_ptr - w);
else
{
src = (char *) malloc (rear_ptr - w);
if (src == NULL)
/* If we cannot allocate the memory don't rewrite the string.
It is better than nothing. */
return w;
}
memcpy (src, w, rear_ptr - w);
char *s = src + (rear_ptr - w);
w = end;
/* Process all characters in the string. */
while (--s >= src)
{
if (*s >= '0' && *s <= '9')
{
if (sizeof (char) == 1)
w = (char *) outdigit_value ((char *) w, *s - '0');
else
*--w = (char) outdigitwc_value (*s - '0');
}
else if (__builtin_expect (map == NULL, 1) || (*s != '.' && *s != ','))
*--w = *s;
else
{
if (sizeof (char) == 1)
{
const char *outpunct = *s == '.' ? decimal : thousands;
size_t dlen = strlen (outpunct);
w -= dlen;
while (dlen-- > 0)
w[dlen] = outpunct[dlen];
}
else
*--w = *s == '.' ? (char) wdecimal : (char) wthousands;
}
}
if (! use_alloca)
free (src);
return w;
}
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