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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2024 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed 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. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <iconv.h>
#include <locale.h>
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif /* HAVE_LANGINFO_H */
#include "log.h"
#include "charset_internal.h"
#include "program.h"
#define CHARSET_ICONV_NULL ((iconv_t)-1)
#define CHARSET_ICONV_HANDLE(name) iconv_t iconv##name = CHARSET_ICONV_NULL
static CHARSET_ICONV_HANDLE(CharToWchar);
static CHARSET_ICONV_HANDLE(WcharToChar);
#define CHARSET_CONVERT_TYPE_TO_TYPE(name, from, to, ret, eof) \
ret convert##name (from f) { \
if (getCharset()) { \
from *fp = &f; \
size_t fs = sizeof(f); \
to t; \
to *tp = &t; \
size_t ts = sizeof(t); \
if (iconv(iconv##name, (void *)&fp, &fs, (void *)&tp, &ts) != (size_t)-1) return t; \
logMessage(LOG_DEBUG, "iconv (" #from " -> " #to ") error: %s", strerror(errno)); \
} \
return eof; \
}
CHARSET_CONVERT_TYPE_TO_TYPE(CharToWchar, char, wchar_t, wint_t, WEOF)
CHARSET_CONVERT_TYPE_TO_TYPE(WcharToChar, wchar_t, unsigned char, int, EOF)
#undef CHARSET_CONVERT_TYPE_TO_TYPE
const char *
getLocaleCharset (void) {
const char *locale = setlocale(LC_ALL, "");
if (locale && !isPosixLocale(locale)) {
#ifdef HAVE_NL_LANGINFO
/* some 8-bit locale is set, assume its charset is correct */
return nl_langinfo(CODESET);
#endif /* HAVE_NL_LANGINFO */
}
return defaultCharset;
}
static void
exitCharsetIconv (void *data) {
static iconv_t *const handles[] = {
&iconvCharToWchar,
&iconvWcharToChar
};
iconv_t *const *handle = handles;
iconv_t *const *const end = handle + ARRAY_COUNT(handles);
while (handle < end) {
if (**handle != CHARSET_ICONV_NULL) {
iconv_close(**handle);
**handle = CHARSET_ICONV_NULL;
}
handle += 1;
}
}
int
registerCharacterSet (const char *charset) {
int firstTime = 0;
const char *const wcharCharset = getWcharCharset();
typedef struct {
iconv_t *const handle;
const char *const fromCharset;
const char *const toCharset;
iconv_t newHandle;
} ConvEntry;
ConvEntry convTable[] = {
{ .handle = &iconvCharToWchar,
.fromCharset = charset,
.toCharset = wcharCharset
},
{ .handle = &iconvWcharToChar,
.fromCharset = wcharCharset,
.toCharset = charset
},
};
ConvEntry *conv = convTable;
const ConvEntry *convEnd = conv + ARRAY_COUNT(convTable);
while (conv < convEnd) {
if ((conv->newHandle = iconv_open(conv->toCharset, conv->fromCharset)) == CHARSET_ICONV_NULL) {
logSystemError("iconv_open");
while (conv > convTable) {
conv -= 1;
iconv_close(conv->newHandle);
}
return 0;
}
conv += 1;
}
while (conv > convTable) {
conv -= 1;
if (*conv->handle == CHARSET_ICONV_NULL) {
firstTime = 1;
} else {
iconv_close(*conv->handle);
}
*conv->handle = conv->newHandle;
}
if (firstTime) onProgramExit("charset-iconv", exitCharsetIconv, NULL);
return 1;
}
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