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/* Access functions for JISX0208 conversion.
Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _JIS0208_H
#define _JIS0208_H 1
#include <gconv.h>
#include <inttypes.h>
/* Conversion table. */
extern const uint16_t jis0208_to_ucs[];
extern const char jisx0208_from_ucs4_lat1[256][2];
extern const char jisx0208_from_ucs4_greek[0xc1][2];
extern const struct jisx0208_ucs_idx jisx0208_from_ucs_idx[];
extern const char jisx0208_from_ucs_tab[][2];
/* Struct for table with indeces in UCS mapping table. */
struct jisx0208_ucs_idx
{
uint16_t start;
uint16_t end;
uint16_t idx;
};
static inline wchar_t
jisx0208_to_ucs4 (char **s, size_t avail)
{
unsigned char ch = *(*s);
unsigned char ch2;
int idx;
if (ch <= 0x20 || ch > 0xea)
return UNKNOWN_10646_CHAR;
if (avail < 2)
return 0;
ch2 = (*s)[1];
if (ch2 <= 0x20 || ch2 >= 0x7f)
return UNKNOWN_10646_CHAR;
idx = (ch - 0x21) * 94 + (ch2 - 0x21);
if (idx >= 0x1e80)
return UNKNOWN_10646_CHAR;
(*s) += 2;
return jis0208_to_ucs[idx] ?: ((*s) -= 2, UNKNOWN_10646_CHAR);
}
static inline size_t
ucs4_to_jisx0208 (wchar_t wch, char **s, size_t avail)
{
unsigned int ch = (unsigned int) wch;
const char *cp = NULL;
if (avail < 2)
return 0;
if (ch < 0x100)
cp = jisx0208_from_ucs4_lat1[ch];
else if (ch >= 0x391 && ch <= 0x451)
cp = jisx0208_from_ucs4_greek[ch];
else
{
const struct jisx0208_ucs_idx *rp = jisx0208_from_ucs_idx;
while (ch > rp->end)
++rp;
if (ch >= rp->start)
cp = jisx0208_from_ucs_tab[rp->idx + ch - rp->start];
}
if (cp == NULL || cp[0] == '\0')
return UNKNOWN_10646_CHAR;
*(*s)++ = cp[0];
*(*s)++ = cp[1];
return 2;
}
#endif /* jis0208.h */
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