Mercurial > hg > early-roguelike
annotate rogue4/save.c @ 14:e7dc81b41168
rogue4: prevent changing name or save file when using system savedir
author | edwarj4 |
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date | Sat, 31 Oct 2009 13:20:00 +0000 |
parents | 63b9fd7d70ce |
children | 09da55b986ca |
rev | line source |
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12
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1 /* |
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2 * save and restore routines |
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3 * |
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4 * @(#)save.c 4.15 (Berkeley) 5/10/82 |
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5 * |
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6 * Rogue: Exploring the Dungeons of Doom |
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7 * Copyright (C) 1980, 1981, 1982 Michael Toy, Ken Arnold and Glenn Wichman |
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8 * All rights reserved. |
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9 * |
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10 * See the file LICENSE.TXT for full copyright and licensing information. |
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11 */ |
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12 |
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13 #include <curses.h> |
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14 #include <sys/types.h> |
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15 #include <sys/stat.h> |
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16 #include <errno.h> |
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17 #include <string.h> |
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18 #include <stdlib.h> |
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19 #define KERNEL |
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20 #include <signal.h> |
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21 #undef KERNEL |
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22 #include "rogue.h" |
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23 |
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24 typedef struct stat STAT; |
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25 |
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26 extern char version[], encstr[]; |
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27 extern bool _endwin; |
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28 |
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29 STAT sbuf; |
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30 |
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31 /* |
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32 * save_game: |
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33 * Implement the "save game" command |
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34 */ |
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35 /* This has to be cleaned up, these goto's are annoying. */ |
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36 save_game() |
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37 { |
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38 register FILE *savef; |
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39 register int c; |
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40 char buf[MAXSTR]; |
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41 |
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42 /* |
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43 * get file name |
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44 */ |
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45 mpos = 0; |
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46 over: |
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47 if (file_name[0] != '\0') |
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48 { |
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49 for (;;) |
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50 { |
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51 msg("save file (%s)? ", file_name); |
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52 c = getchar(); |
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53 mpos = 0; |
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54 if (c == ESCAPE) |
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55 { |
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56 msg(""); |
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57 return FALSE; |
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58 } |
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59 else if (c == 'n' || c == 'N' || c == 'y' || c == 'Y') |
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60 break; |
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61 else |
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62 msg("please answer Y or N"); |
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63 } |
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64 if (c == 'y' || c == 'Y') |
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65 { |
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66 strcpy(buf, file_name); |
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67 goto gotfile; |
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68 } |
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69 } |
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70 |
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71 if (use_savedir) |
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72 { |
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73 /* You can't change the savefile if you're using the system |
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74 savedir, because that means you have privileges. */ |
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75 msg(""); |
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76 return FALSE; |
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77 } |
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78 |
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79 do |
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80 { |
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81 mpos = 0; |
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82 msg("file name: "); |
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83 buf[0] = '\0'; |
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84 if (get_str(buf, stdscr) == QUIT) |
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85 { |
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86 quit: |
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87 msg(""); |
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88 return FALSE; |
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89 } |
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90 mpos = 0; |
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91 gotfile: |
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92 /* |
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93 * test to see if the file exists |
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94 */ |
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95 if (stat(buf, &sbuf) >= 0) |
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96 { |
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97 for (;;) |
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98 { |
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99 msg("File exists. Do you wish to overwrite it?"); |
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100 mpos = 0; |
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101 if ((c = readchar()) == ESCAPE) |
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102 goto quit; |
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103 if (c == 'y' || c == 'Y') |
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104 break; |
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105 else if (c == 'n' || c == 'N') |
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106 goto over; |
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107 else |
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108 msg("Please answer Y or N"); |
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109 } |
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110 msg("file name: %s", buf); |
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111 } |
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112 strcpy(file_name, buf); |
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113 if ((savef = fopen(file_name, "w")) == NULL) |
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114 { |
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115 msg(strerror(errno)); /* fake perror() */ |
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116 if (use_savedir) |
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117 return FALSE; |
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118 } |
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119 } while (savef == NULL); |
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120 |
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121 /* |
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122 * write out encrpyted file (after a stat) |
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123 * The fwrite is to force allocation of the buffer before the write |
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124 */ |
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125 save_file(savef); |
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126 return TRUE; |
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127 } |
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128 |
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129 /* |
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130 * auto_save: |
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131 * Automatically save a file. This is used if a HUP signal is |
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132 * recieved |
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133 */ |
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134 void |
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135 auto_save(int sig) |
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136 { |
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137 register FILE *savef; |
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138 |
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139 md_ignore_signals(); |
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140 |
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141 if (file_name[0] != '\0' && (savef = fopen(file_name, "w")) != NULL) |
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142 save_file(savef); |
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143 endwin(); |
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144 exit(1); |
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145 } |
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146 |
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147 /* |
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148 * save_file: |
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149 * Write the saved game on the file |
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150 */ |
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151 save_file(savef) |
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152 register FILE *savef; |
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153 { |
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154 int slines = LINES; |
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155 int scols = COLS; |
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156 |
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157 /* |
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158 * close any open score file |
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159 */ |
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160 close(fd); |
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161 move(LINES-1, 0); |
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162 refresh(); |
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163 fstat(md_fileno(savef), &sbuf); |
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164 /* |
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165 * DO NOT DELETE. This forces stdio to allocate the output buffer |
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166 * so that malloc doesn't get confused on restart |
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167 */ |
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168 fwrite("junk", 1, 5, savef); |
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169 |
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170 fseek(savef, 0L, 0); |
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171 |
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172 encwrite(version,strlen(version)+1,savef); |
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173 encwrite(&sbuf.st_ino,sizeof(sbuf.st_ino),savef); |
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174 encwrite(&sbuf.st_dev,sizeof(sbuf.st_dev),savef); |
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175 encwrite(&sbuf.st_ctime,sizeof(sbuf.st_ctime),savef); |
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176 encwrite(&sbuf.st_mtime,sizeof(sbuf.st_mtime),savef); |
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177 encwrite(&slines,sizeof(slines),savef); |
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178 encwrite(&scols,sizeof(scols),savef); |
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179 msg(""); |
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180 rs_save_file(savef); |
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181 |
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182 fclose(savef); |
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183 } |
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184 |
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185 /* |
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186 * restore: |
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187 * Restore a saved game from a file with elaborate checks for file |
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188 * integrity from cheaters |
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189 */ |
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190 restore(file, envp) |
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191 register char *file; |
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192 char **envp; |
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193 { |
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194 register int inf; |
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195 register bool syml; |
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196 extern char **environ; |
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197 char buf[MAXSTR]; |
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198 STAT sbuf2; |
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199 int slines, scols; |
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200 |
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201 if (strcmp(file, "-r") == 0) |
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202 file = file_name; |
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203 |
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204 #ifdef SIGTSTP |
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205 /* |
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206 * If a process can be suspended, this code wouldn't work |
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207 */ |
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208 signal(SIGTSTP, SIG_IGN); |
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209 #endif |
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210 |
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211 if ((inf = open(file, 0)) < 0) |
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212 { |
13 | 213 if (use_savedir && errno == ENOENT) |
214 { | |
215 /* We're using a system savefile which doesn't exist. | |
216 This isn't a fatal error, it means start a new game. */ | |
217 return TRUE; | |
218 } | |
12
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219 perror(file); |
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220 return FALSE; |
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221 } |
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222 |
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223 fflush(stdout); |
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224 encread(buf, strlen(version) + 1, inf); |
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225 if (strcmp(buf, version) != 0) |
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226 { |
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227 printf("Sorry, saved game is out of date.\n"); |
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228 return FALSE; |
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229 } |
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230 |
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231 fstat(inf, &sbuf2); |
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232 fflush(stdout); |
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233 syml = issymlink(file); |
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234 if ( |
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235 #ifdef WIZARD |
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236 !wizard && |
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237 #endif |
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238 md_unlink(file) < 0) |
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239 { |
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240 printf("Cannot unlink file\n"); |
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241 return FALSE; |
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242 } |
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243 |
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244 fflush(stdout); |
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245 |
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246 encread(&sbuf.st_ino,sizeof(sbuf.st_ino), inf); |
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247 encread(&sbuf.st_dev,sizeof(sbuf.st_dev), inf); |
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248 encread(&sbuf.st_ctime,sizeof(sbuf.st_ctime), inf); |
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249 encread(&sbuf.st_mtime,sizeof(sbuf.st_mtime), inf); |
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250 encread(&slines,sizeof(slines),inf); |
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251 encread(&scols,sizeof(scols),inf); |
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252 |
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253 /* |
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254 * we do not close the file so that we will have a hold of the |
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255 * inode for as long as possible |
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256 */ |
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257 |
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258 initscr(); |
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259 |
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260 if (slines > LINES) |
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261 { |
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262 printf("Sorry, original game was played on a screen with %d lines.\n",slines); |
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263 printf("Current screen only has %d lines. Unable to restore game\n",LINES); |
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264 return(FALSE); |
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265 } |
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266 |
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267 if (scols > COLS) |
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268 { |
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269 printf("Sorry, original game was played on a screen with %d columns.\n",scols); |
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270 printf("Current screen only has %d columns. Unable to restore game\n",COLS); |
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271 return(FALSE); |
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272 } |
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273 |
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274 hw = newwin(LINES, COLS, 0, 0); |
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275 keypad(stdscr,1); |
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276 |
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277 mpos = 0; |
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278 mvprintw(0, 0, "%s: %s", file, ctime(&sbuf2.st_mtime)); |
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279 |
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280 /* |
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281 * defeat multiple restarting from the same place |
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282 */ |
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283 #ifdef WIZARD |
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284 if (!wizard) |
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285 #endif |
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286 if (sbuf2.st_nlink != 1 || syml) |
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287 { |
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288 printf("Cannot restore from a linked file\n"); |
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289 return FALSE; |
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290 } |
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291 |
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292 if (rs_restore_file(inf) == FALSE) |
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293 { |
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294 endwin(); |
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295 printf("Cannot restore file\n"); |
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296 return(FALSE); |
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297 } |
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298 |
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299 #ifdef SIGTSTP |
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300 signal(SIGTSTP, tstp); |
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301 #endif |
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302 environ = envp; |
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303 strcpy(file_name, file); |
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304 setup(); |
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305 clearok(curscr, TRUE); |
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306 touchwin(stdscr); |
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307 srand(getpid()); |
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308 msg("file name: %s", file); |
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309 status(); |
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310 playit(); |
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311 return 0; |
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312 } |
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313 |
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314 /* |
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315 * encwrite: |
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316 * Perform an encrypted write |
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317 */ |
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318 encwrite(starta, size, outf) |
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319 void *starta; |
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320 unsigned int size; |
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321 register FILE *outf; |
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322 { |
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323 register char *ep; |
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324 register char *start = (char *) starta; |
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325 ep = encstr; |
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326 |
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327 while (size--) |
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328 { |
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329 putc(*start++ ^ *ep++, outf); |
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330 if (*ep == '\0') |
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331 ep = encstr; |
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332 } |
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333 } |
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334 |
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335 /* |
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336 * encread: |
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337 * Perform an encrypted read |
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338 */ |
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339 encread(starta, size, inf) |
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340 register void *starta; |
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341 unsigned int size; |
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342 register int inf; |
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343 { |
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344 register char *ep; |
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345 register int read_size; |
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346 register char *start = (char *) starta; |
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347 |
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348 if ((read_size = read(inf, start, size)) == -1 || read_size == 0) |
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349 return read_size; |
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350 |
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351 ep = encstr; |
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352 |
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353 while (size--) |
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354 { |
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355 *start++ ^= *ep++; |
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356 if (*ep == '\0') |
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357 ep = encstr; |
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358 } |
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359 |
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360 return read_size; |
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361 } |