1 /* 2 * Copyright (C) 1984-2008 Mark Nudelman 3 * 4 * You may distribute under the terms of either the GNU General Public 5 * License or the Less License, as specified in the README file. 6 * 7 * For more information about less, or for information on how to 8 * contact the author, see the README file. 9 */ 10 11 12 /* 13 * Entry point, initialization, miscellaneous routines. 14 */ 15 16 #include "less.h" 17 #if MSDOS_COMPILER==WIN32C 18 #include <windows.h> 19 #endif 20 21 public char * every_first_cmd = NULL; 22 public int new_file; 23 public int is_tty; 24 public IFILE curr_ifile = NULL_IFILE; 25 public IFILE old_ifile = NULL_IFILE; 26 public struct scrpos initial_scrpos; 27 public int any_display = FALSE; 28 public POSITION start_attnpos = NULL_POSITION; 29 public POSITION end_attnpos = NULL_POSITION; 30 public int wscroll; 31 public char * progname; 32 public int quitting; 33 public int secure; 34 public int dohelp; 35 public int less_is_more; 36 37 #if LOGFILE 38 public int logfile = -1; 39 public int force_logfile = FALSE; 40 public char * namelogfile = NULL; 41 #endif 42 43 #if EDITOR 44 public char * editor; 45 public char * editproto; 46 #endif 47 48 #if TAGS 49 extern char * tags; 50 extern char * tagoption; 51 extern int jump_sline; 52 #endif 53 54 #ifdef WIN32 55 static char consoleTitle[256]; 56 #endif 57 58 extern int missing_cap; 59 extern int know_dumb; 60 extern int quit_if_one_screen; 61 extern int pr_type; 62 63 64 /* 65 * Entry point. 66 */ 67 int 68 main(argc, argv) 69 int argc; 70 char *argv[]; 71 { 72 IFILE ifile; 73 char *s; 74 75 #ifdef __EMX__ 76 _response(&argc, &argv); 77 _wildcard(&argc, &argv); 78 #endif 79 80 progname = *argv++; 81 argc--; 82 83 secure = 0; 84 s = lgetenv("LESSSECURE"); 85 if (s != NULL && *s != '\0') 86 secure = 1; 87 88 #ifdef WIN32 89 if (getenv("HOME") == NULL) 90 { 91 /* 92 * If there is no HOME environment variable, 93 * try the concatenation of HOMEDRIVE + HOMEPATH. 94 */ 95 char *drive = getenv("HOMEDRIVE"); 96 char *path = getenv("HOMEPATH"); 97 if (drive != NULL && path != NULL) 98 { 99 char *env = (char *) ecalloc(strlen(drive) + 100 strlen(path) + 6, sizeof(char)); 101 strcpy(env, "HOME="); 102 strcat(env, drive); 103 strcat(env, path); 104 putenv(env); 105 } 106 } 107 GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char)); 108 #endif /* WIN32 */ 109 110 /* 111 * Process command line arguments and LESS environment arguments. 112 * Command line arguments override environment arguments. 113 */ 114 is_tty = isatty(1); 115 get_term(); 116 init_cmds(); 117 init_charset(); 118 init_line(); 119 init_cmdhist(); 120 init_option(); 121 122 /* 123 * If the name of the executable program is "more", 124 * act like LESS_IS_MORE is set. 125 */ 126 for (s = progname + strlen(progname); s > progname; s--) 127 { 128 if (s[-1] == PATHNAME_SEP[0]) 129 break; 130 } 131 if (strcmp(s, "more") == 0) 132 less_is_more = 1; 133 134 init_prompt(); 135 136 s = lgetenv(less_is_more ? "MORE" : "LESS"); 137 if (s != NULL) 138 scan_option(save(s)); 139 140 #define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0') 141 while (argc > 0 && (isoptstring(*argv) || isoptpending())) 142 { 143 s = *argv++; 144 argc--; 145 if (strcmp(s, "--") == 0) 146 break; 147 scan_option(s); 148 } 149 #undef isoptstring 150 151 if (isoptpending()) 152 { 153 /* 154 * Last command line option was a flag requiring a 155 * following string, but there was no following string. 156 */ 157 nopendopt(); 158 quit(QUIT_OK); 159 } 160 161 if (less_is_more && get_quit_at_eof()) 162 quit_if_one_screen = TRUE; 163 164 #if EDITOR 165 editor = lgetenv("VISUAL"); 166 if (editor == NULL || *editor == '\0') 167 { 168 editor = lgetenv("EDITOR"); 169 if (editor == NULL || *editor == '\0') 170 editor = EDIT_PGM; 171 } 172 editproto = lgetenv("LESSEDIT"); 173 if (editproto == NULL || *editproto == '\0') 174 editproto = "%E ?lm+%lm. %f"; 175 #endif 176 177 /* 178 * Call get_ifile with all the command line filenames 179 * to "register" them with the ifile system. 180 */ 181 ifile = NULL_IFILE; 182 if (dohelp) 183 ifile = get_ifile(FAKE_HELPFILE, ifile); 184 while (argc-- > 0) 185 { 186 char *filename; 187 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC) 188 /* 189 * Because the "shell" doesn't expand filename patterns, 190 * treat each argument as a filename pattern rather than 191 * a single filename. 192 * Expand the pattern and iterate over the expanded list. 193 */ 194 struct textlist tlist; 195 char *gfilename; 196 197 gfilename = lglob(*argv++); 198 init_textlist(&tlist, gfilename); 199 filename = NULL; 200 while ((filename = forw_textlist(&tlist, filename)) != NULL) 201 { 202 (void) get_ifile(filename, ifile); 203 ifile = prev_ifile(NULL_IFILE); 204 } 205 free(gfilename); 206 #else 207 filename = shell_quote(*argv); 208 if (filename == NULL) 209 filename = *argv; 210 argv++; 211 (void) get_ifile(filename, ifile); 212 ifile = prev_ifile(NULL_IFILE); 213 #endif 214 } 215 /* 216 * Set up terminal, etc. 217 */ 218 if (!is_tty) 219 { 220 /* 221 * Output is not a tty. 222 * Just copy the input file(s) to output. 223 */ 224 SET_BINARY(1); 225 if (nifile() == 0) 226 { 227 if (edit_stdin() == 0) 228 cat_file(); 229 } else if (edit_first() == 0) 230 { 231 do { 232 cat_file(); 233 } while (edit_next(1) == 0); 234 } 235 quit(QUIT_OK); 236 } 237 238 if (missing_cap && !know_dumb) 239 error("WARNING: terminal is not fully functional", NULL_PARG); 240 init_mark(); 241 open_getchr(); 242 raw_mode(1); 243 init_signals(1); 244 245 /* 246 * Select the first file to examine. 247 */ 248 #if TAGS 249 if (tagoption != NULL || strcmp(tags, "-") == 0) 250 { 251 /* 252 * A -t option was given. 253 * Verify that no filenames were also given. 254 * Edit the file selected by the "tags" search, 255 * and search for the proper line in the file. 256 */ 257 if (nifile() > 0) 258 { 259 error("No filenames allowed with -t option", NULL_PARG); 260 quit(QUIT_ERROR); 261 } 262 findtag(tagoption); 263 if (edit_tagfile()) /* Edit file which contains the tag */ 264 quit(QUIT_ERROR); 265 /* 266 * Search for the line which contains the tag. 267 * Set up initial_scrpos so we display that line. 268 */ 269 initial_scrpos.pos = tagsearch(); 270 if (initial_scrpos.pos == NULL_POSITION) 271 quit(QUIT_ERROR); 272 initial_scrpos.ln = jump_sline; 273 } else 274 #endif 275 if (nifile() == 0) 276 { 277 if (edit_stdin()) /* Edit standard input */ 278 quit(QUIT_ERROR); 279 } else 280 { 281 if (edit_first()) /* Edit first valid file in cmd line */ 282 quit(QUIT_ERROR); 283 } 284 285 init(); 286 commands(); 287 quit(QUIT_OK); 288 /*NOTREACHED*/ 289 return (0); 290 } 291 292 /* 293 * Copy a string to a "safe" place 294 * (that is, to a buffer allocated by calloc). 295 */ 296 public char * 297 save(s) 298 char *s; 299 { 300 register char *p; 301 302 p = (char *) ecalloc(strlen(s)+1, sizeof(char)); 303 strcpy(p, s); 304 return (p); 305 } 306 307 /* 308 * Allocate memory. 309 * Like calloc(), but never returns an error (NULL). 310 */ 311 public VOID_POINTER 312 ecalloc(count, size) 313 int count; 314 unsigned int size; 315 { 316 register VOID_POINTER p; 317 318 p = (VOID_POINTER) calloc(count, size); 319 if (p != NULL) 320 return (p); 321 error("Cannot allocate memory", NULL_PARG); 322 quit(QUIT_ERROR); 323 /*NOTREACHED*/ 324 return (NULL); 325 } 326 327 /* 328 * Skip leading spaces in a string. 329 */ 330 public char * 331 skipsp(s) 332 register char *s; 333 { 334 while (*s == ' ' || *s == '\t') 335 s++; 336 return (s); 337 } 338 339 /* 340 * See how many characters of two strings are identical. 341 * If uppercase is true, the first string must begin with an uppercase 342 * character; the remainder of the first string may be either case. 343 */ 344 public int 345 sprefix(ps, s, uppercase) 346 char *ps; 347 char *s; 348 int uppercase; 349 { 350 register int c; 351 register int sc; 352 register int len = 0; 353 354 for ( ; *s != '\0'; s++, ps++) 355 { 356 c = *ps; 357 if (uppercase) 358 { 359 if (len == 0 && ASCII_IS_LOWER(c)) 360 return (-1); 361 if (ASCII_IS_UPPER(c)) 362 c = ASCII_TO_LOWER(c); 363 } 364 sc = *s; 365 if (len > 0 && ASCII_IS_UPPER(sc)) 366 sc = ASCII_TO_LOWER(sc); 367 if (c != sc) 368 break; 369 len++; 370 } 371 return (len); 372 } 373 374 /* 375 * Exit the program. 376 */ 377 public void 378 quit(status) 379 int status; 380 { 381 static int save_status; 382 383 /* 384 * Put cursor at bottom left corner, clear the line, 385 * reset the terminal modes, and exit. 386 */ 387 if (status < 0) 388 status = save_status; 389 else 390 save_status = status; 391 quitting = 1; 392 edit((char*)NULL); 393 save_cmdhist(); 394 if (any_display && is_tty) 395 clear_bot(); 396 deinit(); 397 flush(); 398 raw_mode(0); 399 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC 400 /* 401 * If we don't close 2, we get some garbage from 402 * 2's buffer when it flushes automatically. 403 * I cannot track this one down RB 404 * The same bug shows up if we use ^C^C to abort. 405 */ 406 close(2); 407 #endif 408 #if WIN32 409 SetConsoleTitle(consoleTitle); 410 #endif 411 close_getchr(); 412 exit(status); 413 } 414