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annotate shterm.js @ 7:d1b3c3af34d6

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WebTTY: switch terminal size to 80x25.
author John "Elwin" Edwards <elwin@sdf.org>
date Mon, 07 May 2012 16:03:10 -0700
parents 21738794755e
children 826a7ced69f8
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1
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1 /* shterm.js: browser-side JavaScript to handle I/O for termemu.js when it
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2 * is running a shell via the webtty.js server.
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3 */
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4
0
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5 // A state machine that keeps track of polling the server.
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6 var ajaxstate = {
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7 state: 0,
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8 timerID: null,
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9 clear: function () {
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10 if (this.timerID != null) {
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11 window.clearTimeout(this.timerID);
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12 this.timerID = null;
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13 }
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14 },
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15 set: function (ms) {
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16 this.clear();
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17 this.timerID = window.setTimeout(getData, ms);
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18 },
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19 gotdata: function () {
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20 this.set(100);
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21 this.state = 0;
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22 },
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23 gotnothing: function () {
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24 if (this.state == 0) {
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25 this.set(100);
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26 this.state = 1;
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27 }
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28 else if (this.state == 1) {
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29 this.set(300);
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30 this.state = 2;
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31 }
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32 else if (this.state == 2) {
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33 this.set(1000);
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34 this.state = 3;
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35 }
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36 else {
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37 this.set(5000);
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38 this.state = 3;
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39 }
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40 },
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41 posted: function () {
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42 this.set(100);
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43 this.state = 0;
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44 }
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45 };
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46
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47 function writeData(hexstr) {
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48 var codenum;
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49 var codes = [];
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50 var nc;
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51 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */
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52 var expect = 0; /* The number of 10------ bytes expected. */
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53 /* UTF-8 translation. */
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54 for (var i = 0; i < hexstr.length; i += 2) {
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55 nc = Number("0x" + hexstr.substr(i, 2));
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56 if (nc < 0x7F) {
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57 /* 0------- */
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58 codes.push(nc);
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59 /* Any incomplete sequence will be discarded. */
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60 u8wait = 0;
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61 expect = 0;
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62 }
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63 else if (nc < 0xC0) {
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64 /* 10------ : part of a multibyte sequence */
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65 if (expect > 0) {
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66 u8wait <<= 6;
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67 u8wait += (nc & 0x3F);
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68 expect--;
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69 if (expect == 0) {
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70 codes.push(u8wait);
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71 u8wait = 0;
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72 }
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73 }
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74 else {
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75 /* Assume an initial byte was missed. */
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76 u8wait = 0;
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77 }
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78 }
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79 /* These will all discard any incomplete sequence. */
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80 else if (nc < 0xE0) {
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81 /* 110----- : introduces 2-byte sequence */
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82 u8wait = (nc & 0x1F);
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83 expect = 1;
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84 }
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85 else if (nc < 0xF0) {
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86 /* 1110---- : introduces 3-byte sequence */
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87 u8wait = (nc & 0x0F);
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88 expect = 2;
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