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-
- /*
- * HZ
- */
-
- /* Specification: RFC 1842, RFC 1843 */
-
- /*
- * The state is 1 in GB mode, 0 in ASCII mode.
- */
-
- static int
- hz_mbtowc (conv_t conv, wchar_t *pwc, const unsigned char *s, int n)
- {
- state_t state = conv->istate;
- unsigned int count = 0;
- unsigned char c;
- for (;;) {
- c = *s;
- if (c == '~') {
- if (n < count+2)
- goto none;
- c = s[1];
- if (state == 0) {
- if (c == '~') {
- *pwc = (wchar_t) '~';
- conv->istate = state;
- return count+2;
- }
- if (c == '{') {
- state = 1;
- s += 2; count += 2;
- if (n < count+1)
- goto none;
- continue;
- }
- if (c == '\n') {
- s += 2; count += 2;
- if (n < count+1)
- goto none;
- continue;
- }
- } else {
- if (c == '}') {
- state = 0;
- s += 2; count += 2;
- if (n < count+1)
- goto none;
- continue;
- }
- }
- return RET_ILSEQ;
- }
- break;
- }
- if (state == 0) {
- *pwc = (wchar_t) c;
- conv->istate = state;
- return count+1;
- } else {
- int ret;
- if (n < count+2)
- goto none;
- ret = gb2312_mbtowc(conv,pwc,s,2);
- if (ret == RET_ILSEQ)
- return RET_ILSEQ;
- if (ret != 2) abort();
- conv->istate = state;
- return count+2;
- }
-
- none:
- conv->istate = state;
- return RET_TOOFEW(count);
- }
-
- static int
- hz_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n)
- {
- state_t state = conv->ostate;
- unsigned char buf[2];
- int ret;
-
- /* Code set 0 (ASCII or GB 1988-89) */
- ret = ascii_wctomb(conv,buf,wc,1);
- if (ret != RET_ILSEQ) {
- if (ret != 1) abort();
- if (buf[0] < 0x80) {
- int count = (state ? 3 : 1);
- if (n < count)
- return RET_TOOSMALL;
- if (state) {
- r[0] = '~';
- r[1] = '}';
- r += 2;
- state = 0;
- }
- r[0] = buf[0];
- conv->ostate = state;
- return count;
- }
- }
-
- /* Code set 1 (GB 2312-1980) */
- ret = gb2312_wctomb(conv,buf,wc,2);
- if (ret != RET_ILSEQ) {
- if (ret != 2) abort();
- if (buf[0] < 0x80 && buf[1] < 0x80) {
- int count = (state ? 2 : 4);
- if (n < count)
- return RET_TOOSMALL;
- if (!state) {
- r[0] = '~';
- r[1] = '{';
- r += 2;
- state = 1;
- }
- r[0] = buf[0];
- r[1] = buf[1];
- conv->ostate = state;
- return count;
- }
- }
-
- return RET_ILSEQ;
- }
-
- static int
- hz_reset (conv_t conv, unsigned char *r, int n)
- {
- state_t state = conv->ostate;
- if (state) {
- if (n < 2)
- return RET_TOOSMALL;
- r[0] = '~';
- r[1] = '}';
- /* conv->ostate = 0; will be done by the caller */
- return 2;
- } else
- return 0;
- }
-