mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 17:53:37 +08:00
89 lines
3.3 KiB
C
89 lines
3.3 KiB
C
/* Charset name normalization.
|
|
Copyright (C) 2001-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <ctype.h>
|
|
#include <locale.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include <sys/stat.h>
|
|
#include <stdlib.h>
|
|
#include "gconv_int.h"
|
|
|
|
|
|
/* An iconv encoding is in the form of a triplet, with parts separated by
|
|
a '/' character. The first part is the standard name, the second part is
|
|
the character set, and the third part is the error handler. If the first
|
|
part is sufficient to identify both the standard and the character set
|
|
then the second part can be empty e.g. UTF-8//. If the first part is not
|
|
sufficient to identify both the standard and the character set then the
|
|
second part is required e.g. ISO-10646/UTF8/. If neither the first or
|
|
second parts are provided e.g. //, then the current locale is used.
|
|
The actual values used in the first and second parts are not entirely
|
|
relevant to the implementation. The values themselves are used in a hash
|
|
table to lookup modules and so the naming convention of the first two parts
|
|
is somewhat arbitrary and only helps locate the entries in the cache.
|
|
The third part is the error handler and is comprised of a ',' or '/'
|
|
separated list of suffixes. Currently, we support "TRANSLIT" for
|
|
transliteration and "IGNORE" for ignoring conversion errors due to
|
|
unrecognized input characters. */
|
|
#define GCONV_TRIPLE_SEPARATOR "/"
|
|
#define GCONV_SUFFIX_SEPARATOR ","
|
|
#define GCONV_TRANSLIT_SUFFIX "TRANSLIT"
|
|
#define GCONV_IGNORE_ERRORS_SUFFIX "IGNORE"
|
|
|
|
|
|
/* This function copies in-order, characters from the source 's' that are
|
|
either alphanumeric or one in one of these: "_-.,:/" - into the destination
|
|
'wp' while dropping all other characters. In the process, it converts all
|
|
alphabetical characters to upper case. It then appends up to two '/'
|
|
characters so that the total number of '/'es in the destination is 2. */
|
|
static inline void __attribute__ ((unused, always_inline))
|
|
strip (char *wp, const char *s)
|
|
{
|
|
int slash_count = 0;
|
|
|
|
while (*s != '\0')
|
|
{
|
|
if (__isalnum_l (*s, _nl_C_locobj_ptr)
|
|
|| *s == '_' || *s == '-' || *s == '.' || *s == ',' || *s == ':')
|
|
*wp++ = __toupper_l (*s, _nl_C_locobj_ptr);
|
|
else if (*s == '/')
|
|
{
|
|
if (++slash_count == 3)
|
|
break;
|
|
*wp++ = '/';
|
|
}
|
|
++s;
|
|
}
|
|
|
|
while (slash_count++ < 2)
|
|
*wp++ = '/';
|
|
|
|
*wp = '\0';
|
|
}
|
|
|
|
|
|
static inline char * __attribute__ ((unused, always_inline))
|
|
upstr (char *dst, const char *str)
|
|
{
|
|
char *cp = dst;
|
|
while ((*cp++ = __toupper_l (*str++, _nl_C_locobj_ptr)) != '\0')
|
|
/* nothing */;
|
|
return dst;
|
|
}
|