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1 /*
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2 * Entry point, initialization, miscellaneous routines.
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3 */
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4
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5 #include "less.h"
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6 #include "position.h"
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7
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8 public int ispipe;
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9 public char * every_first_cmd = NULL;
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10 public int new_file;
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11 public int is_tty;
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12 public IFILE curr_ifile = NULL_IFILE;
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13 public IFILE old_ifile = NULL_IFILE;
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14 public struct scrpos initial_scrpos;
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15 public int any_display = 0;
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16 public int scroll;
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17 public char * progname;
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18 public int quitting;
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19
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20 extern int file;
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21 extern int quit_at_eof;
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22 extern int cbufs;
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23 extern int errmsgs;
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24 extern int screen_trashed;
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25 extern int force_open;
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26
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27 #if LOGFILE
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28 public int logfile = -1;
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29 public int force_logfile = 0;
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30 public char * namelogfile = NULL;
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31 #endif
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32
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33 #if EDITOR
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34 public char * editor;
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35 public char * editproto;
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36 #endif
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37
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38 #if TAGS
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39 extern char * tagfile;
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40 extern char * tagpattern;
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41 extern int tagoption;
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42 #endif
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43
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44
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45
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46 /*
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47 * Entry point.
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48 */
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49 main(argc, argv)
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50 int argc;
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51 char *argv[];
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52 {
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53 IFILE h;
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54 int nofiles;
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55 extern char *getenv();
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56
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57 progname = *argv++;
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58
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59 /*
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60 * Process command line arguments and LESS environment arguments.
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61 * Command line arguments override environment arguments.
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62 */
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63 init_prompt();
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64 init_charset();
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65 init_option();
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66 scan_option(getenv("LESS"));
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67
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68 #define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
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69 while (--argc > 0 && (isoptstring(argv[0]) || isoptpending()))
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70 scan_option(*argv++);
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71 #undef isoptstring
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72
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73 if (isoptpending())
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74 {
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75 /*
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76 * Last command line option was a flag requiring a
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77 * following string, but there was no following string.
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78 */
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79 nopendopt();
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80 quit(0);
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81 }
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82
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83 #if USERFILE
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84 /*
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85 * Try to use the lesskey file "$HOME/.less".
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86 */
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87 add_hometable();
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88 #endif
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89 #if EDITOR
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90 editor = getenv("EDITOR");
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91 if (editor == NULL || *editor == '\0')
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92 editor = EDIT_PGM;
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93 editproto = getenv("LESSEDIT");
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94 if (editproto == NULL || *editproto == '\0')
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95 editproto = "%E ?lm+%lm. %f";
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96 #endif
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97
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98 /*
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99 * Set up terminal, etc.
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100 */
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101 is_tty = isatty(1);
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102 if (!is_tty)
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103 {
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104 /*
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105 * Output is not a tty.
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106 * Just copy the input file(s) to output.
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107 */
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108 if (argc <= 0)
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109 {
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110 if (edit("-", 0) == 0)
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111 cat_file();
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112 } else
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113 {
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114 while (--argc >= 0)
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115 {
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116 if (edit(*argv++, 0) == 0)
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117 cat_file();
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118 }
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119 }
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120 quit(0);
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121 }
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122
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123 /*
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124 * Call get_ifile with all the command line filenames
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125 * to "register" them with the ifile system.
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126 */
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127 h = NULL_IFILE;
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128 while (--argc >= 0)
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129 h = get_ifile(*argv++, h);
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130
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131 init_mark();
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132 raw_mode(1);
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133 get_term();
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134 open_getchr();
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135
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136 init_signals(1);
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137
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138 /*
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139 * Select the first file to examine.
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140 */
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141 #if TAGS
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142 if (tagoption)
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143 {
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144 /*
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145 * A -t option was given.
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146 * Verify that no filenames were also given.
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147 * Edit the file selected by the "tags" search,
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148 * and search for the proper line in the file.
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149 */
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150 if (nifile() > 0)
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151 {
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152 error("No filenames allowed with -t option", NULL_PARG);
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153 quit(1);
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154 }
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155 if (tagfile == NULL)
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156 quit(1);
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157 if (edit(tagfile, 0) || tagsearch())
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158 quit(1);
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159 nofiles = 0;
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160 } else
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161 #endif
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162 if (nifile() == 0)
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163 nofiles = edit("-", 0); /* Standard input */
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164 else
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165 nofiles = edit_first();
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166
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167 if (nofiles)
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168 {
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169 quit(1);
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170 /*NOTREACHED*/
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171 }
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172
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173 init();
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174 commands();
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175 quit(0);
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176 /*NOTREACHED*/
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177 }
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178
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179 /*
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180 * Copy a string, truncating to the specified length if necessary.
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181 * Unlike strncpy(), the resulting string is guaranteed to be null-terminated.
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182 */
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183 public void
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184 strtcpy(to, from, len)
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185 char *to;
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186 char *from;
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187 unsigned int len;
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188 {
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189 strncpy(to, from, len);
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190 to[len-1] = '\0';
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191 }
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192
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193 /*
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194 * Copy a string to a "safe" place
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195 * (that is, to a buffer allocated by calloc).
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196 */
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197 public char *
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198 save(s)
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199 char *s;
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200 {
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201 register char *p;
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202
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203 p = (char *) ecalloc(strlen(s)+1, sizeof(char));
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204 strcpy(p, s);
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205 return (p);
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206 }
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207
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208 public VOID_POINTER
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209 ecalloc(count, size)
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210 int count;
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211 unsigned int size;
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212 {
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213 register VOID_POINTER p;
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214
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215 p = calloc(count, size);
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216 if (p != NULL)
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217 return (p);
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218 error("Cannot allocate memory", NULL_PARG);
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219 quit(1);
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220 /*NOTREACHED*/
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221 }
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222
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223 /*
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224 * Skip leading spaces in a string.
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225 */
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226 public char *
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227 skipsp(s)
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228 register char *s;
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229 {
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230 while (*s == ' ' || *s == '\t')
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231 s++;
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232 return (s);
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233 }
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234
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235 /*
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236 * Exit the program.
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237 */
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238 public void
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239 quit(status)
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240 int status;
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241 {
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242 static int save_status;
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243
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244 /*
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245 * Put cursor at bottom left corner, clear the line,
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246 * reset the terminal modes, and exit.
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247 */
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248 if (status < 0)
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249 status = save_status;
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250 else
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251 save_status = status;
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252 quitting = 1;
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253 #if LOGFILE
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254 end_logfile();
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255 #endif
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256 if (any_display)
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257 {
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258 lower_left();
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259 clear_eol();
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260 }
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261 deinit();
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262 flush();
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263 raw_mode(0);
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264 #if __MSDOS__
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265 restore_screen();
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266 /*
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267 * If we don't close 2, we get some garbage from
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268 * 2's buffer when it flushes automatically.
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269 * I cannot track this one down RB
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270 * The same bug shows up if we use ^C^C to abort.
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271 */
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272 close(2);
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273 #endif
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274 exit(status);
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275 }
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