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1 #include "less.h"
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2
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3 #if __MSDOS__
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4 #include <fcntl.h>
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5 #include <stdlib.h>
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6 #include <string.h>
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7 #include <io.h>
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8 #endif
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9
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10 #define ISPIPE(fd) ((fd)==0)
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11 extern int ispipe;
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12 extern int new_file;
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13 extern int errmsgs;
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14 extern int quit_at_eof;
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15 extern int file;
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16 extern int cbufs;
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17 extern char *every_first_cmd;
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18 extern int any_display;
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19 extern int force_open;
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20 extern int is_tty;
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21 extern IFILE curr_ifile;
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22 extern IFILE old_ifile;
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23 extern struct scrpos initial_scrpos;
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24
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25 #if LOGFILE
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26 extern int logfile;
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27 extern int force_logfile;
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28 extern char *namelogfile;
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29 #endif
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30
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31
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32 /*
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33 * Edit a new file.
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34 * Filename == "-" means standard input.
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35 * Filename == NULL means just close the current file.
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36 */
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37 public int
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38 edit(filename, just_looking)
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39 register char *filename;
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40 int just_looking;
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41 {
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42 register int f;
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43 char *s;
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44 int answer;
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45 int no_display;
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46 struct scrpos scrpos;
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47 PARG parg;
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48
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49 if (filename == NULL)
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50 {
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51 /*
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52 * Close the current file, but don't open a new one.
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53 */
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54 f = -1;
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55 } else if (strcmp(filename, "-") == 0)
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56 {
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57 /*
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58 * Use standard input.
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59 */
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60 f = 0;
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61 } else if ((parg.p_string = bad_file(filename)) != NULL)
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62 {
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63 error("%s", &parg);
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64 free(parg.p_string);
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65 return (1);
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66 #if __MSDOS__
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67 } else if ((f = open(filename, O_RDONLY|O_BINARY)) < 0)
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68 #else
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69 } else if ((f = open(filename, 0)) < 0)
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70 #endif
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71 {
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72 parg.p_string = errno_message(filename);
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73 error("%s", &parg);
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74 free(parg.p_string);
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75 return (1);
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76 } else if (!force_open && !just_looking && bin_file(f))
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77 {
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78 parg.p_string = filename;
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79 answer = query("\"%s\" may be a binary file. Continue? ",
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80 &parg);
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81 if (answer != 'y' && answer != 'Y')
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82 {
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83 close(f);
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84 return (1);
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85 }
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86 }
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87
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88 if (f >= 0 && isatty(f))
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89 {
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90 /*
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91 * Not really necessary to call this an error,
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92 * but if the control terminal (for commands)
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93 * and the input file (for data) are the same,
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94 * we get weird results at best.
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95 */
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96 #if __MSDOS__
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97 parg.p_string = "less -?";
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98 #else
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99 parg.p_string = "less -\\?";
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100 #endif
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101 error("Cannot take input from a terminal (\"%s\" for help)",
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102 &parg);
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103 if (!ISPIPE(f))
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104 close(f);
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105 return (1);
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106 }
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107
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108 #if LOGFILE
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109 s = namelogfile;
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110 end_logfile();
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111 if (f >= 0 && ISPIPE(f) && s != NULL && is_tty)
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112 use_logfile(s);
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113 #endif
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114
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115 /*
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116 * We are now committed to using the new file.
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117 * Close the current input file and set up to use the new one.
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118 */
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119 if (curr_ifile != NULL_IFILE)
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120 {
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121 /*
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122 * Save the current position so that we can return to
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123 * the same position if we edit this file again.
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124 */
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125 get_scrpos(&scrpos);
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126 if (scrpos.pos != NULL_POSITION)
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127 {
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128 store_pos(curr_ifile, &scrpos);
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129 lastmark();
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130 }
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131 }
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132
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133 /*
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134 * Close the current file, unless it is a pipe.
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135 */
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136 if (!ISPIPE(file))
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137 close(file);
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138 file = f;
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139
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140 if (f < 0)
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141 return (1);
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142
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143 /*
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144 * Get the new ifile.
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145 * Get the saved position for that file.
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146 */
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147 old_ifile = curr_ifile;
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148 curr_ifile = get_ifile(filename, curr_ifile);
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149 get_pos(curr_ifile, &initial_scrpos);
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150
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151 ispipe = ISPIPE(f);
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152 if (ispipe)
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153 ch_pipe();
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154 else
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155 ch_nonpipe();
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156 (void) ch_nbuf(cbufs);
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157 ch_flush();
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158
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159 new_file = 1;
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160
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161 #if __MSDOS__
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162 top_filename();
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163 #endif
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164
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165 if (every_first_cmd != NULL)
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166 ungetsc(every_first_cmd);
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167
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168 no_display = !any_display;
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169 flush();
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170 any_display = 1;
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171
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172 if (is_tty)
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173 {
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174 /*
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175 * Output is to a real tty.
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176 */
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177
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178 /*
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179 * Indicate there is nothing displayed yet.
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180 */
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181 pos_clear();
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182 clr_linenum();
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183 if (no_display && errmsgs > 0)
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184 {
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185 /*
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186 * We displayed some messages on error output
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187 * (file descriptor 2; see error() function).
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188 * Before erasing the screen contents,
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189 * display the file name and wait for a keystroke.
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190 */
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191 parg.p_string = filename;
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192 error("%s", &parg);
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193 }
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194 }
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195 return (0);
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196 }
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197
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198 /*
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199 * Edit a space-separated list of files.
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200 * For each filename in the list, enter it into the ifile list.
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201 * Then edit the first one.
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202 */
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203 public void
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204 edit_list(list)
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205 char *list;
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206 {
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207 register char *s;
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208 register char *es;
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209 register char *filename;
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210 char *good_filename;
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211 IFILE save_curr_ifile;
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212
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213 /*
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214 * good_filename keeps track of the first valid filename.
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215 */
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216 good_filename = NULL;
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217 s = list;
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218 es = s + strlen(s);
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219 save_curr_ifile = curr_ifile;
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220 while ((s = skipsp(s)) < es)
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221 {
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222 /*
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223 * Get the next filename and null terminate it.
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224 */
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225 filename = s;
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226 while (*s != ' ' && *s != '\0')
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227 s++;
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228 if (*s != '\0')
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229 *s++ = '\0';
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230 /*
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231 * Try to edit the file.
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232 * This enters it into the command line list (if it is good).
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233 * If it is the first good file we've seen, remember it.
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234 * {{ A little weirdness here: if any of the filenames
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235 * are already in the list, subsequent ones get
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236 * entered after the position where that one already
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237 * was, instead of at the end. }}
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238 */
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239 if (edit(filename, 1) == 0 && good_filename == NULL)
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240 good_filename = filename;
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241 }
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242
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243 /*
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244 * Edit the first valid filename in the list.
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245 */
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246 if (good_filename != NULL)
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247 {
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248 curr_ifile = save_curr_ifile;
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249 (void) edit(good_filename, 0);
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250 }
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251 }
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252
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253 /*
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254 * Edit the first file in the command line (ifile) list.
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255 */
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256 public int
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257 edit_first()
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258 {
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259 curr_ifile = NULL_IFILE;
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260 return (edit_next(1));
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261 }
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262
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263 /*
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264 * Edit the last file in the command line (ifile) list.
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265 */
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266 public int
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267 edit_last()
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268 {
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269 curr_ifile = NULL_IFILE;
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270 return (edit_prev(1));
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271 }
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272
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273
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274 /*
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275 * Edit the next file in the command line (ifile) list.
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276 */
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277 public int
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278 edit_next(n)
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279 int n;
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280 {
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281 IFILE h;
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282
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283 h = curr_ifile;
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284 while (--n >= 0 || edit(get_filename(h), 0))
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285 {
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286 if ((h = next_ifile(h)) == NULL_IFILE)
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287 /*
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288 * Reached end of the ifile list.
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289 */
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290 return (1);
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291 }
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292 /*
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293 * Found a file that we can edit.
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294 */
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295 return (0);
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296 }
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297
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298 /*
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299 * Edit the previous file in the command line list.
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300 */
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301 public int
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302 edit_prev(n)
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303 int n;
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304 {
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305 IFILE h;
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306
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307 h = curr_ifile;
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308 while (--n >= 0 || edit(get_filename(h), 0))
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309 {
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310 if ((h = prev_ifile(h)) == NULL_IFILE)
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311 /*
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312 * Reached beginning of the ifile list.
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313 */
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314 return (1);
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315 }
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316 /*
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317 * Found a file that we can edit.
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318 */
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319 return (0);
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320 }
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321
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322 /*
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323 * Edit a specific file in the command line (ifile) list.
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324 */
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325 public int
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326 edit_index(n)
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327 int n;
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328 {
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329 IFILE h;
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330
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331 h = NULL_IFILE;
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332 do
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333 {
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334 if ((h = next_ifile(h)) == NULL_IFILE)
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335 {
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336 /*
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337 * Reached end of the list without finding it.
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338 */
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339 return (1);
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340 }
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341 } while (get_index(h) != n);
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342
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343 return (edit(get_filename(h), 0));
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344 }
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345
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346 /*
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347 * Copy a file directly to standard output.
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348 * Used if standard output is not a tty.
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349 */
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350 public void
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351 cat_file()
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352 {
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353 register int c;
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354
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355 while ((c = ch_forw_get()) != EOI)
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356 putchr(c);
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357 flush();
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358 }
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359
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360 #if LOGFILE
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361
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362 /*
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363 * If the user asked for a log file and our input file
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364 * is standard input, create the log file.
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365 * We take care not to blindly overwrite an existing file.
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366 */
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367 public void
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368 use_logfile(filename)
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369 char *filename;
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370 {
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371 register int exists;
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372 register int answer;
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373 PARG parg;
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374
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375 /*
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376 * {{ We could use access() here. }}
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377 */
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378 exists = open(filename, 0);
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379 close(exists);
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380 exists = (exists >= 0);
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381
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382 /*
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383 * Decide whether to overwrite the log file or append to it.
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384 * (If it doesn't exist we "overwrite" it.
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385 */
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386 if (!exists || force_logfile)
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387 {
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388 /*
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389 * Overwrite (or create) the log file.
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390 */
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391 answer = 'O';
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392 } else
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393 {
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394 /*
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395 * Ask user what to do.
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396 */
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397 parg.p_string = filename;
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398 answer = query("Warning: \"%s\" exists; Overwrite, Append or Don't log? ", &parg);
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399 }
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400
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401 loop:
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402 switch (answer)
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403 {
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404 case 'O': case 'o':
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405 /*
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406 * Overwrite: create the file.
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407 */
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408 logfile = creat(filename, 0644);
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409 break;
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410 case 'A': case 'a':
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411 /*
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412 * Append: open the file and seek to the end.
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413 */
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414 #if __MSDOS__
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415 logfile = open(filename, O_APPEND|O_WRONLY);
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416 #else
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417 logfile = open(filename, 1);
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418 #endif
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419 if (lseek(logfile, (offset_t)0, 2) == BAD_LSEEK)
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420 {
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421 close(logfile);
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422 logfile = -1;
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423 }
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424 break;
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425 case 'D': case 'd':
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426 /*
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427 * Don't do anything.
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428 */
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429 return;
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430 case 'q':
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431 quit(0);
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432 /*NOTREACHED*/
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433 default:
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434 /*
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435 * Eh?
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436 */
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437 answer = query("Overwrite, Append, or Don't log? ", NULL_PARG);
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438 goto loop;
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439 }
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440
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441 if (logfile < 0)
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442 {
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443 /*
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444 * Error in opening logfile.
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445 */
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446 parg.p_string = filename;
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447 error("Cannot write to \"%s\"", &parg);
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448 }
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449 }
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450
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451 #endif
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