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-
- /*
- * 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
-