1 | /* |
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2 | Copyright 1991 by the Massachusetts Institute of Technology |
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3 | |
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4 | Permission to use, copy, modify, and distribute this |
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5 | software and its documentation for any purpose and without |
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6 | fee is hereby granted, provided that the above copyright |
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7 | notice appear in all copies and that both that copyright |
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8 | notice and this permission notice appear in supporting |
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9 | documentation, and that the name of M.I.T. not be used in |
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10 | advertising or publicity pertaining to distribution of the |
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11 | software without specific, written prior permission. |
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12 | M.I.T. makes no representations about the suitability of |
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13 | this software for any purpose. It is provided "as is" |
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14 | without express or implied warranty. |
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15 | */ |
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16 | |
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17 | /* |
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18 | ** cache.c: manage the files in /tmp |
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19 | ** |
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20 | ** Ensure we have the ones we need, and get rid of the ones no |
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21 | /* |
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22 | ** cache.c: manage the files in /tmp |
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23 | ** |
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24 | ** Ensure we have the ones we need, and get rid of the ones no |
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25 | ** longer in use. |
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26 | ** |
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27 | */ |
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28 | |
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29 | #include <stdio.h> |
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30 | #include <X11/Intrinsic.h> |
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31 | #include <X11/StringDefs.h> |
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32 | #include <X11/IntrinsicP.h> |
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33 | #include <X11/CoreP.h> |
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34 | #include <X11/Xaw/Command.h> |
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35 | #include <X11/Xaw/AsciiText.h> |
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36 | #include <X11/Xaw/TextP.h> |
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37 | #include <fcntl.h> |
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38 | #include "xdsc.h" |
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39 | |
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40 | #define NUM_CACHED_FILES 5 |
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41 | #define CACHE_DIR_NEXT 1 |
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42 | #define CACHE_DIR_PREV 2 |
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43 | #define CACHE_DIR_NREF 3 |
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44 | #define CACHE_DIR_PREF 4 |
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45 | |
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46 | |
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47 | static char rcsid[] = ""; |
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48 | |
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49 | extern char *RunCommand(); |
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50 | extern EntryRec toplevelbuttons[2][MAX_BUTTONS]; |
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51 | extern TextWidget bottextW, toptextW; |
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52 | extern Boolean debug; |
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53 | extern char filebase[]; |
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54 | extern int topscreen; |
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55 | extern int edscversion; |
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56 | extern Widget topW; |
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57 | extern void TopSelect(); |
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58 | extern Boolean nocache; |
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59 | extern char axis[]; |
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60 | |
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61 | int next=0, prev=0; |
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62 | static int nref = 0, pref=0, fref=0, lref=0; |
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63 | static int first=0, last=0; |
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64 | static int highestseen; |
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65 | static int current; |
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66 | |
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67 | static int cache[NUM_CACHED_FILES] = {-1,-1,-1,-1,-1}; |
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68 | static char currentmtglong[LONGNAMELEN] = ""; |
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69 | static char currentmtgshort[SHORTNAMELEN] = ""; |
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70 | |
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71 | char *GetTransactionFile(); |
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72 | |
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73 | char * |
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74 | CurrentMtg(which) |
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75 | int which; |
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76 | { |
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77 | if (which == 0) |
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78 | return (currentmtglong); |
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79 | else |
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80 | return (currentmtgshort); |
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81 | } |
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82 | |
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83 | int |
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84 | SaveMeetingNames(newlong, newshort) |
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85 | char *newlong; |
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86 | char *newshort; |
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87 | { |
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88 | char oldlong[LONGNAMELEN]; |
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89 | char oldshort[SHORTNAMELEN]; |
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90 | if (*currentmtglong) { |
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91 | MarkLastRead(); |
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92 | DeleteOldTransactions(); |
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93 | } |
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94 | |
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95 | if (*newlong) { |
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96 | strcpy (oldlong, currentmtglong); |
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97 | strcpy (currentmtglong, newlong); |
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98 | strcpy (oldshort, currentmtgshort); |
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99 | strcpy (currentmtgshort, newshort); |
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100 | if (SetUpTransactionNumbers() == -1) { |
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101 | strcpy (currentmtglong, oldlong); |
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102 | strcpy (currentmtgshort, oldshort); |
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103 | return (-1); |
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104 | } |
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105 | } |
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106 | |
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107 | else { |
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108 | *currentmtglong = '\0'; |
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109 | *currentmtgshort = '\0'; |
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110 | } |
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111 | return (0); |
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112 | } |
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113 | |
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114 | /* |
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115 | ** GoToTransaction updates the data structures and cache so that |
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116 | ** we are in a particular transaction. |
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117 | ** |
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118 | ** if 'update' is True (it usually is) we put the contents of the |
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119 | ** transaction into the lower text widget. |
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120 | */ |
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121 | |
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122 | GoToTransaction (num, update) |
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123 | int num; |
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124 | Boolean update; |
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125 | { |
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126 | static char command[LONGNAMELEN + 25]; |
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127 | char *filename; |
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128 | char *returndata; |
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129 | int transactionnum; |
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130 | |
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131 | if (!num) return; |
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132 | |
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133 | if (num < 0) |
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134 | transactionnum = TransactionNum(num); |
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135 | else |
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136 | transactionnum = num; |
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137 | |
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138 | if (update && topscreen == LISTTRNS); |
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139 | UpdateHighlightedTransaction(transactionnum); |
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140 | |
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141 | sprintf (command, "Reading %s [%d-%d], #%d...", |
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142 | currentmtglong, first, last, transactionnum); |
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143 | PutUpStatusMessage(command); |
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144 | |
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145 | if ((filename = GetTransactionFile(num)) == (char *) -1) |
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146 | return (-1); |
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147 | |
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148 | if (update) |
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149 | FileIntoWidget(filename, bottextW); |
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150 | |
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151 | sprintf (command, "(gti %d %s)\n", transactionnum, currentmtglong); |
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152 | returndata = RunCommand (command, NULL, NULL, True); |
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153 | |
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154 | if ((int) returndata <= 0) goto DONE; |
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155 | |
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156 | sscanf ( returndata, |
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157 | "%*c%d%d%d%d%d%d%d%*s", |
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158 | ¤t, &prev, &next, &pref, |
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159 | &nref, &fref, &lref); |
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160 | |
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161 | myfree(returndata); |
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162 | CheckButtonSensitivity(BUTTONS_UPDATE); |
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163 | |
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164 | if (!nocache) |
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165 | CacheSurroundingTransactions(); |
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166 | |
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167 | if ( current > highestseen) |
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168 | highestseen = current; |
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169 | |
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170 | if ( next > last || current > last) { |
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171 | MarkLastRead(); |
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172 | (void) SetUpTransactionNumbers(); |
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173 | } |
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174 | |
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175 | if (highestseen == last && topscreen == MAIN) |
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176 | RemoveLetterC(); |
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177 | DONE: |
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178 | sprintf (command, "Reading %s [%d-%d], #%d", |
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179 | currentmtglong, first, last, transactionnum); |
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180 | PutUpStatusMessage(command); |
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181 | } |
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182 | |
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183 | DeleteOldTransactions() |
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184 | { |
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185 | char filename[80]; |
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186 | unsigned int fd; |
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187 | |
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188 | DeleteTransactionFile(current); |
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189 | DeleteTransactionFile(prev); |
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190 | DeleteTransactionFile(next); |
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191 | DeleteTransactionFile(pref); |
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192 | DeleteTransactionFile(nref); |
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193 | |
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194 | sprintf (filename, "%s-list", filebase); |
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195 | if ((fd = open(filename, O_RDONLY)) != -1) { |
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196 | close (fd); |
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197 | unlink (filename); |
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198 | } |
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199 | |
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200 | next=0, prev=0, nref=0; |
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201 | pref=0, fref=0, lref=0; |
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202 | first=0, last=0, current=0; |
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203 | } |
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204 | |
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205 | /* |
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206 | ** Read in the transactions immedidately before and after the |
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207 | ** current one. |
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208 | */ |
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209 | |
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210 | CacheSurroundingTransactions() |
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211 | { |
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212 | |
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213 | int i; |
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214 | |
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215 | /* |
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216 | ** Remove unnecessary files |
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217 | */ |
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218 | |
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219 | for (i = 0; i < NUM_CACHED_FILES; i++) { |
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220 | if ( cache[i] != next && cache[i] != prev && |
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221 | cache[i] != nref && cache[i] != pref && |
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222 | cache[i] != current && cache[i] != -1) { |
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223 | |
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224 | DeleteTransactionFile(cache[i]); |
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225 | } |
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226 | } |
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227 | |
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228 | /* |
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229 | ** Get the files we need |
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230 | */ |
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231 | (void) GetTransactionFile (next); |
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232 | (void) GetTransactionFile (prev); |
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233 | (void) GetTransactionFile (nref); |
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234 | (void) GetTransactionFile (pref); |
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235 | (void) GetTransactionFile (current); |
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236 | |
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237 | } |
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238 | |
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239 | /* |
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240 | ** Remove the file from /tmp and the cache. |
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241 | */ |
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242 | |
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243 | DeleteTransactionFile(num) |
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244 | int num; |
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245 | { |
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246 | char filename[50]; |
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247 | int i; |
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248 | |
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249 | sprintf (filename, "%s-%d", filebase, num); |
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250 | unlink (filename); |
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251 | |
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252 | for (i = 0; i < NUM_CACHED_FILES; i++) |
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253 | if (cache[i] == num) |
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254 | cache[i] = -1; |
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255 | } |
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256 | |
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257 | /* |
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258 | ** This function behaves differently depending on the version of |
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259 | ** edsc we're talking to. |
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260 | ** |
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261 | ** If edsc is doing the caching, just ask for the transaction and |
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262 | ** return the filename. |
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263 | ** |
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264 | ** If we're doing the caching, ask if the file is already in the cache, |
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265 | ** and return the filename if it is. Otherwise, run the |
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266 | ** edsc command to fetch it, note it as cached, and return the filename. |
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267 | ** |
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268 | */ |
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269 | |
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270 | char * |
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271 | GetTransactionFile(num) |
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272 | int num; |
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273 | { |
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274 | static char filename[50]; |
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275 | char command[LONGNAMELEN + 25]; |
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276 | int i; |
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277 | char *retval; |
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278 | int transactionnum; |
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279 | int direction; |
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280 | |
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281 | if (num == 0) |
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282 | return((char *)-1); |
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283 | |
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284 | /* |
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285 | ** have we been passed a symbol instead of a number? |
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286 | */ |
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287 | |
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288 | if (num < 0) |
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289 | transactionnum = TransactionNum(num); |
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290 | else |
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291 | transactionnum = num; |
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292 | |
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293 | if (!nocache) |
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294 | sprintf (filename, "%s-%d", filebase, transactionnum); |
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295 | /* |
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296 | ** See if the file is in our cache. If so, return its filename;. |
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297 | */ |
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298 | if (!nocache) { |
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299 | for (i = 0; i < NUM_CACHED_FILES; i++) { |
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300 | if (cache[i] == num) { |
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301 | return (filename); |
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302 | } |
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303 | } |
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304 | } |
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305 | |
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306 | /* |
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307 | ** If file doesn't exist, go get it. |
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308 | */ |
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309 | if (nocache) { |
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310 | switch (num) { |
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311 | case NEXT: |
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312 | direction = CACHE_DIR_NEXT; |
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313 | break; |
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314 | case PREV: |
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315 | direction = CACHE_DIR_PREV; |
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316 | break; |
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317 | case NREF: |
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318 | direction = CACHE_DIR_NREF; |
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319 | break; |
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320 | case PREF: |
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321 | direction = CACHE_DIR_PREF; |
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322 | break; |
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323 | default: |
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324 | direction = 0; |
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325 | break; |
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326 | } |
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327 | |
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328 | sprintf ( command, "(gtfc %d %d %s)\n", |
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329 | direction, transactionnum, currentmtglong); |
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330 | |
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331 | retval = RunCommand (command, NULL, NULL, True); |
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332 | if ((int) retval <= 0) |
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333 | return((char *)-1); |
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334 | sscanf (retval, "(\"%[^\"]", filename); |
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335 | } |
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336 | |
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337 | else { |
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338 | sprintf ( command, "(gtf %s %d %s)\n", |
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339 | filename, transactionnum, currentmtglong); |
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340 | retval = RunCommand (command, NULL, NULL, True); |
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341 | if ((int) retval <= 0) |
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342 | return((char *)-1); |
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343 | |
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344 | for (i = 0; i < NUM_CACHED_FILES; i++) { |
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345 | if (cache[i] == -1) { |
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346 | cache[i] = num; |
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347 | break; |
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348 | } |
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349 | } |
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350 | } |
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351 | |
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352 | myfree (retval); |
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353 | return (filename); |
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354 | } |
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355 | |
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356 | /* |
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357 | ** Return the highestseen from mtg. Also set first, last, and highestseen. |
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358 | ** Set current to highestseen if it's not already set (ie, we've just |
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359 | ** entered the meeting) |
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360 | ** |
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361 | ** Return -1 if something went wrong. |
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362 | */ |
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363 | |
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364 | int |
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365 | SetUpTransactionNumbers() |
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366 | { |
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367 | |
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368 | char command[LONGNAMELEN + 25]; |
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369 | char *retval; |
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370 | static int oldhighestseen = 0; |
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371 | |
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372 | sprintf (command, "(gmi %s)\n", currentmtglong); |
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373 | |
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374 | retval = RunCommand (command, NULL, NULL, True); |
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375 | if ((int) retval <= 0) return (-1); |
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376 | |
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377 | sscanf (retval, "(\"%*[^\"]\" \"%*[^\"]\" \"%*[^\"]\" %d %d %*d %*d \"%*[^\"]\" \"%*[^\"]\" %*d \"%[^\"]\" %d", |
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378 | &first, &last, axis, &highestseen); |
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379 | |
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380 | oldhighestseen = highestseen; |
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381 | |
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382 | if (last == 0 && first == 0) { |
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383 | fprintf (stderr,"xdsc: Reply out of sync with request!\n"); |
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384 | fprintf (stderr,"xdsc: requested '%s', got '%s'\n",command, retval); |
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385 | PutUpWarning( "INTERNAL ERROR DETECTED", |
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386 | "I suggest you quit immediately to avoid\npossible corruption of your .meetings file.", True); |
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387 | myfree(retval); |
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388 | return (-1); |
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389 | } |
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390 | myfree(retval); |
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391 | |
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392 | if (highestseen > last) { |
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393 | PutUpWarning( "WARNING", |
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394 | "The highest-read transaction in this\nmeeting no longer exists.\nGoing to end of the meeting.", True); |
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395 | highestseen = last; |
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396 | } |
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397 | |
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398 | if (debug) { |
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399 | fprintf (stderr, "highestseen message of %s is %d\n", |
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400 | currentmtglong, highestseen); |
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401 | |
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402 | fprintf (stderr, "first is %d, last is %d\n",first, last); |
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403 | } |
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404 | |
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405 | GoToTransaction (highestseen, False); |
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406 | |
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407 | return (highestseen); |
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408 | } |
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409 | |
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410 | MarkLastRead() |
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411 | { |
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412 | static char command[LONGNAMELEN + 25]; |
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413 | |
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414 | if (*currentmtglong) { |
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415 | sprintf ( command, |
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416 | "(ss %d %s)\n", |
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417 | highestseen, |
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418 | currentmtglong); |
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419 | if (edscversion >= 24) |
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420 | (void) RunCommand (command, NULL, NULL, True); |
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421 | else |
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422 | (void) RunCommand (command, NULL, NULL, False); |
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423 | } |
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424 | |
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425 | } |
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426 | |
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427 | TransactionNum(arg) |
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428 | int arg; |
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429 | { |
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430 | switch (arg) { |
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431 | case NEXT: |
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432 | return(next); |
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433 | case PREV: |
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434 | return(prev); |
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435 | case NREF: |
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436 | return(nref); |
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437 | case PREF: |
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438 | return(pref); |
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439 | case LREF: |
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440 | return(lref); |
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441 | case FREF: |
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442 | return(fref); |
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443 | case FIRST: |
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444 | return(first); |
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445 | case LAST: |
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446 | return(last); |
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447 | case CURRENT: |
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448 | return(current); |
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449 | case HIGHESTSEEN: |
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450 | return(highestseen); |
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451 | default: |
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452 | fprintf (stderr, "Unknown arg to TransactionNum: %d\n", arg); |
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453 | return(0); |
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454 | } |
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455 | } |
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456 | |
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457 | MoveToMeeting(which) |
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458 | int which; |
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459 | { |
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460 | Arg args[2]; |
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461 | Boolean transactionflag = False; |
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462 | /* |
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463 | ** If we're currently showing transactions, we have to restore the top-level |
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464 | ** list of meetings. |
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465 | */ |
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466 | if (topscreen == LISTTRNS) { |
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467 | XawTextDisableRedisplay(toptextW); |
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468 | TopSelect (NULL, 4 + (1 << 4)); |
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469 | transactionflag = True; |
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470 | } |
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471 | |
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472 | /* |
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473 | ** HighlightNewItem will eventually call SaveMeetingNames and |
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474 | ** SetUpTransactionNumbers to get the next, prev, etc. vars set. |
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475 | */ |
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476 | if (HighlightNewItem(toptextW, which, True) == 0) { |
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477 | |
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478 | /* |
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479 | ** Need to restore transaction list? |
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480 | */ |
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481 | if (transactionflag == True) { |
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482 | TopSelect (NULL, 4 + (0 << 4)); |
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483 | XawTextEnableRedisplay(toptextW); |
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484 | } |
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485 | |
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486 | /* |
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487 | ** Clear out bottom text window. |
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488 | */ |
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489 | XtSetArg (args[0], XtNstring, ""); |
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490 | XtSetArg (args[1], XtNlength, 0); |
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491 | XtSetValues (bottextW, args, 1); |
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492 | |
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493 | /* |
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494 | ** If we're at the end of the meeting, make it so the "next" button |
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495 | ** will show us the last transaction. |
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496 | */ |
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497 | if (next == 0) |
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498 | next = last; |
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499 | |
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500 | CheckButtonSensitivity(BUTTONS_ON); |
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501 | return (0); |
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502 | } |
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503 | |
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504 | else { |
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505 | return (-1); |
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506 | } |
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507 | } |
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508 | |
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509 | /* |
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510 | ** Make sure bottom buttons are set appropriately, according to context |
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511 | ** and mode. |
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512 | ** |
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513 | ** Mode = BUTTONS_UPDATE: turn on appropriate buttons, if sensitive = True. |
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514 | ** Mode = BUTTONS_OFF: Turn off all buttons. Set sensitive = False. |
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515 | ** Mode = BUTTONS_ON: Turn on appropriate buttons. Set sensitive = True. |
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516 | ** |
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517 | */ |
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518 | CheckButtonSensitivity(mode) |
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519 | int mode; |
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520 | { |
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521 | static Boolean sensitive = True; |
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522 | Arg args[2]; |
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523 | |
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524 | if (mode == BUTTONS_ON) sensitive = True; |
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525 | if (mode == BUTTONS_OFF) sensitive = False; |
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526 | |
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527 | if (next && sensitive) { |
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528 | XtSetArg(args[0], XtNsensitive, True); |
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529 | XtSetArg(args[1], XtNborderWidth, 1); |
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530 | } |
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531 | else { |
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532 | XtSetArg(args[0], XtNsensitive, False); |
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533 | XtSetArg(args[1], XtNborderWidth, 4); |
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534 | } |
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535 | XtSetValues ((toplevelbuttons[1][0]).button, args, 2); |
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536 | |
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537 | if (prev && sensitive) |
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538 | XtSetArg(args[0], XtNsensitive, True); |
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539 | else |
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540 | XtSetArg(args[0], XtNsensitive, False); |
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541 | XtSetValues ((toplevelbuttons[1][1]).button, args, 1); |
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542 | |
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543 | if (nref && sensitive) |
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544 | XtSetArg(args[0], XtNsensitive, True); |
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545 | else |
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546 | XtSetArg(args[0], XtNsensitive, False); |
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547 | XtSetValues ((toplevelbuttons[1][2]).button, args, 1); |
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548 | |
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549 | if (pref && sensitive) |
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550 | XtSetArg(args[0], XtNsensitive, True); |
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551 | else |
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552 | XtSetArg(args[0], XtNsensitive, False); |
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553 | XtSetValues ((toplevelbuttons[1][3]).button, args, 1); |
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554 | |
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555 | if (topscreen == LISTTRNS && sensitive) |
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556 | XtSetArg(args[0], XtNsensitive, True); |
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557 | else |
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558 | XtSetArg(args[0], XtNsensitive, False); |
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559 | XtSetValues ((toplevelbuttons[0][5]).button, args, 1); |
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560 | |
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561 | if (axis[0] == ' ' && axis[6] == ' ') |
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562 | XtSetArg(args[0], XtNsensitive, False); |
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563 | else |
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564 | XtSetArg(args[0], XtNsensitive, True); |
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565 | XtSetValues ((toplevelbuttons[1][5]).button, args, 1); |
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566 | |
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567 | if (axis[0] == ' ') |
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568 | XtSetArg(args[0], XtNsensitive, False); |
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569 | else |
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570 | XtSetArg(args[0], XtNsensitive, True); |
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571 | XtSetValues ((toplevelbuttons[1][5]).nextrec->button, args, 1); |
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572 | |
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573 | if (axis[6] == ' ') |
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574 | XtSetArg(args[0], XtNsensitive, False); |
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575 | else |
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576 | XtSetArg(args[0], XtNsensitive, True); |
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577 | XtSetValues ((toplevelbuttons[1][5]).nextrec->nextrec->button, args, 1); |
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578 | |
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579 | XtSetArg(args[0], XtNsensitive, False); |
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580 | XtSetValues ((toplevelbuttons[1][6]).nextrec->nextrec->button, args, 1); |
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581 | } |
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