/*
* ISO-2022-JP-1
*/
/* Specification: RFC 2237 */
#define ESC 0x1b
/*
* The state can be one of the following values.
*/
#define STATE_ASCII 0
#define STATE_JISX0201ROMAN 1
#define STATE_JISX0208 2
#define STATE_JISX0212 3
static int
iso2022_jp1_mbtowc (conv_t conv, wchar_t *pwc, const unsigned char *s, int n)
{
state_t state = conv->istate;
int count = 0;
unsigned char c;
for (;;) {
c = *s;
if (c == ESC) {
if (n < count+3)
goto none;
if (s[1] == '(') {
if (s[2] == 'B') {
state = STATE_ASCII;
s += 3; count += 3;
if (n < count+1)
goto none;
continue;
}
if (s[2] == 'J') {
state = STATE_JISX0201ROMAN;
s += 3; count += 3;
if (n < count+1)
goto none;
continue;
}
return RET_ILSEQ;
}
if (s[1] == '$') {
if (s[2] == '@' || s[2] == 'B') {
/* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */
state = STATE_JISX0208;
s += 3; count += 3;
if (n < count+1)
goto none;
continue;
}
if (s[2] == '(') {
if (n < count+4)
goto none;
if (s[3] == 'D') {
state = STATE_JISX0212;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
}
return RET_ILSEQ;
}
return RET_ILSEQ;
}
break;
}
switch (state) {
case STATE_ASCII:
if (c < 0x80) {
int ret = ascii_mbtowc(conv,pwc,s,1);
if (ret == RET_ILSEQ)
return RET_ILSEQ;
if (ret != 1) abort();
conv->istate = state;
return count+1;
} else
return RET_ILSEQ;
case STATE_JISX0201ROMAN:
if (c < 0x80) {
int ret = jisx0201_mbtowc(conv,pwc,s,1);
if (ret == RET_ILSEQ)
return RET_ILSEQ;
if (ret != 1) abort();
conv->istate = state;
return count+1;
} else
return RET_ILSEQ;
case STATE_JISX0208:
if (n < count+2)
goto none;
if (s[0] < 0x80 && s[1] < 0x80) {
int ret = jisx0208_mbtowc(conv,pwc,s,2);
if (ret == RET_ILSEQ)
return RET_ILSEQ;
if (ret != 2) abort();
conv->istate = state;
return count+2;
} else
return RET_ILSEQ;
case STATE_JISX0212:
if (n < count+2)
goto none;
if (s[0] < 0x80 && s[1] < 0x80) {
int ret = jisx0212_mbtowc(conv,pwc,s,2);
if (ret == RET_ILSEQ)
return RET_ILSEQ;
if (ret != 2) abort();
conv->istate = state;
return count+2;
} else
return RET_ILSEQ;
default: abort();
}
none:
conv->istate = state;
return RET_TOOFEW(count);
}
static int
iso2022_jp1_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n)
{
state_t state = conv->ostate;
unsigned char buf[2];
int ret;
/* Try ASCII. */
ret = ascii_wctomb(conv,buf,wc,1);
if (ret != RET_ILSEQ) {
if (ret != 1) abort();
if (buf[0] < 0x80) {
int count = (state == STATE_ASCII ? 1 : 4);
if (n < count)
return RET_TOOSMALL;
if (state != STATE_ASCII) {
r[0] = ESC;
r[1] = '(';
r[2] = 'B';
r += 3;
state = STATE_ASCII;
}
r[0] = buf[0];
conv->ostate = state;
return count;
}
}
/* Try JIS X 0201-1976 Roman. */
ret = jisx0201_wctomb(conv,buf,wc,1);
if (ret != RET_ILSEQ) {
if (ret != 1) abort();
if (buf[0] < 0x80) {
int count = (state == STATE_JISX0201ROMAN ? 1 : 4);
if (n < count)
return RET_TOOSMALL;
if (state != STATE_JISX0201ROMAN) {
r[0] = ESC;
r[1] = '(';
r[2] = 'J';
r += 3;
state = STATE_JISX0201ROMAN;
}
r[0] = buf[0];
conv->ostate = state;
return count;
}
}
/* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */
ret = jisx0208_wctomb(conv,buf,wc,2);
if (ret != RET_ILSEQ) {
if (ret != 2) abort();
if (buf[0] < 0x80 && buf[1] < 0x80) {
int count = (state == STATE_JISX0208 ? 2 : 5);
if (n < count)
return RET_TOOSMALL;
if (state != STATE_JISX0208) {
r[0] = ESC;
r[1] = '$';
r[2] = 'B';
r += 3;
state = STATE_JISX0208;
}
r[0] = buf[0];
r[1] = buf[1];
conv->ostate = state;
return count;
}
}
/* Try JIS X 0212-1990. */
ret = jisx0212_wctomb(conv,buf,wc,2);
if (ret != RET_ILSEQ) {
if (ret != 2) abort();
if (buf[0] < 0x80 && buf[1] < 0x80) {
int count = (state == STATE_JISX0212 ? 2 : 6);
if (n < count)
return RET_TOOSMALL;
if (state != STATE_JISX0212) {
r[0] = ESC;
r[1] = '$';
r[2] = '(';
r[3] = 'D';
r += 4;
state = STATE_JISX0212;
}
r[0] = buf[0];
r[1] = buf[1];
conv->ostate = state;
return count;
}
}
return RET_ILSEQ;
}
static int
iso2022_jp1_reset (conv_t conv, unsigned char *r, int n)
{
state_t state = conv->ostate;
if (state != STATE_ASCII) {
if (n < 3)
return RET_TOOSMALL;
r[0] = ESC;
r[1] = '(';
r[2] = 'B';
/* conv->ostate = 0; will be done by the caller */
return 3;
} else
return 0;
}
#undef STATE_JISX0212
#undef STATE_JISX0208
#undef STATE_JISX0201ROMAN
#undef STATE_ASCII
