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annotate shterm.js @ 27:83f9a799a374

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rlgwebd.js: read commands from the console The RLG-Web server can now be controlled with commands sent to stdin. Currently, the only one implemented is "quit". Some improvements to the shutdown process were also made.
author John "Elwin" Edwards <elwin@sdf.org>
date Mon, 04 Jun 2012 14:21:41 -0700
parents 155f3c104759
children 7a50b4412fea
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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
14
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5 var nsend = 0; // The number of the next packet to send.
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6 var nrecv = 0; // The next packet expected.
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7 var msgQ = []; // Queue for out-of-order messages.
13
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8
0
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9 // A state machine that keeps track of polling the server.
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10 var ajaxstate = {
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11 state: 0,
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12 timerID: null,
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13 clear: function () {
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14 if (this.timerID != null) {
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15 window.clearTimeout(this.timerID);
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16 this.timerID = null;
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17 }
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18 },
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19 set: function (ms) {
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20 this.clear();
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21 this.timerID = window.setTimeout(getData, ms);
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22 },
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23 gotdata: function () {
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24 this.set(100);
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25 this.state = 0;
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26 },
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27 gotnothing: function () {
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28 if (this.state == 0) {
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29 this.set(100);
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30 this.state = 1;
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31 }
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32 else if (this.state == 1) {
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33 this.set(300);
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34 this.state = 2;
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35 }
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36 else if (this.state == 2) {
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37 this.set(1000);
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38 this.state = 3;
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39 }
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40 else {
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41 this.set(5000);
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42 this.state = 3;
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43 }
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44 },
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45 posted: function () {
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46 this.set(100);
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47 this.state = 0;
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48 }
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49 };
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50
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51 function writeData(hexstr) {
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52 var codenum;
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53 var codes = [];
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54 var nc;
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55 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */
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56 var expect = 0; /* The number of 10------ bytes expected. */
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57 /* UTF-8 translation. */
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58 for (var i = 0; i < hexstr.length; i += 2) {
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59 nc = Number("0x" + hexstr.substr(i, 2));
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60 if (nc < 0x7F) {
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61 /* 0------- */
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62 codes.push(nc);
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63 /* Any incomplete sequence will be discarded. */
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64 u8wait = 0;
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65 expect = 0;
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66 }
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67 else if (nc < 0xC0) {
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68 /* 10------ : part of a multibyte sequence */
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69 if (expect > 0) {
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70 u8wait <<= 6;
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71 u8wait += (nc & 0x3F);
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72 expect--;
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73 if (expect == 0) {
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74 codes.push(u8wait);
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75 u8wait = 0;
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76 }
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77 }
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78 else {
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79 /* Assume an initial byte was missed. */
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80 u8wait = 0;
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81 }
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82 }
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83 /* These will all discard any incomplete sequence. */
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84 else if (nc < 0xE0) {
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85 /* 110----- : introduces 2-byte sequence */
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86 u8wait = (nc & 0x1F);
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87 expect = 1;
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