mirror of https://github.com/buserror/mii_emu.git
106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
/*
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* mish_vt.c
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*
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* Copyright (C) 2020 Michel Pollet <buserror@gmail.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdio.h>
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#include "mish_priv_vt.h"
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(_a) (sizeof(_a) / sizeof((_a)[0]))
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#endif
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/*
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* Handle sequences of VT100 and UTF8 chars.
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*
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* Uses the sequence 's' as temporary buffer, and returns 1 when a complete
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* sequence OR a glyph has been decoded.
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*/
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int
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_mish_vt_sequence_char(
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mish_vt_sequence_p s,
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uint8_t ch)
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{
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// if previous sequence was done, reset it.
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if (s->done)
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s->flags = s->seq = s->glyph = s->pc = s->p[0] = 0;
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switch (s->seq) {
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case MISH_VT_RAW: {
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switch (ch) {
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case 0x1b:
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s->seq = MISH_VT_ESC;
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break;
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default: {
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if (ch & 0x80) { // UTF8 !??!
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int mask = 0x40;
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s->seq_want = 0;
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while ((ch & mask) && s->seq_want < 5) {
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s->seq_want++;
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mask >>= 1;
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}
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// clear header bits (ought to be 2; 1 allows encoding of 0xffffff)
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s->glyph = ch & (0xff >> (s->seq_want + 1));
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s->seq = MISH_VT_UTF8;
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} else {
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s->seq = (s->seq << 8) | ch;
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s->glyph = ch; // technically it's a glyph
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s->done = 1;
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}
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}
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}
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} break;
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case MISH_VT_ESC: {
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if (ch == '[')
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s->seq = MISH_VT_CSI;
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else {
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s->seq = (s->seq << 8) | ch;
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s->done = 1;
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}
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} break;
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case MISH_VT_CSIQ:
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case MISH_VT_CSI: {
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switch (ch) {
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case '?': {
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// note this would still accept somelike like CSI ? 00?; 1
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if ((s->seq == MISH_VT_CSIQ) || s->pc) {
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s->done = s->error = 1;
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} else
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s->seq = MISH_VT_CSIQ;
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} break;
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case '0' ... '9':
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s->p[s->pc] = (s->p[s->pc] * 10) + (ch - '0');
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break;
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case ';': {
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if (s->pc < ARRAY_SIZE(s->p)) {
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s->pc++;
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s->p[s->pc] = 0;
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} else {
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s->done = s->error = 1;
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}
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} break;
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default:
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if (s->p[s->pc])
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s->pc++;
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s->seq = (s->seq << 8) | ch;
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s->done = 1;
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break;
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}
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} break;
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case MISH_VT_UTF8: {
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s->glyph = (s->glyph << 6) | (ch & 0x3f);
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if (s->seq_want) s->seq_want--;
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s->done = s->seq_want == 0;
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} break;
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}
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#ifdef MISH_VT_DEBUG
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if (s->done)
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fprintf(stderr, "in %x(%c) state %x done:%d error:%d pc:%d/%d\n",
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ch, ch < ' '?'.':ch,s->seq, s->done, s->error,
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s->pc, (int)ARRAY_SIZE(s->p));
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#endif
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return s->done;
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}
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