1 /* $NetBSD: main.c,v 1.5 2023/10/06 05:49:49 simonb Exp $ */ 2 3 /* 4 * Copyright (C) 1984-2023 Mark Nudelman 5 * 6 * You may distribute under the terms of either the GNU General Public 7 * License or the Less License, as specified in the README file. 8 * 9 * For more information, see the README file. 10 */ 11 12 13 /* 14 * Entry point, initialization, miscellaneous routines. 15 */ 16 17 #include "less.h" 18 #if MSDOS_COMPILER==WIN32C 19 #define WIN32_LEAN_AND_MEAN 20 #include <windows.h> 21 #endif 22 23 public char * every_first_cmd = NULL; 24 public int new_file; 25 public int is_tty; 26 public IFILE curr_ifile = NULL_IFILE; 27 public IFILE old_ifile = NULL_IFILE; 28 public struct scrpos initial_scrpos; 29 public POSITION start_attnpos = NULL_POSITION; 30 public POSITION end_attnpos = NULL_POSITION; 31 public int wscroll; 32 public char * progname; 33 public int quitting; 34 public int secure; 35 public int dohelp; 36 public int more_mode = 0; 37 38 #if LOGFILE 39 public int logfile = -1; 40 public int force_logfile = FALSE; 41 public char * namelogfile = NULL; 42 #endif 43 44 #if EDITOR 45 public char * editor; 46 public char * editproto; 47 #endif 48 49 #if TAGS 50 extern char * tags; 51 extern char * tagoption; 52 extern int jump_sline; 53 #endif 54 55 #ifdef WIN32 56 static char consoleTitle[256]; 57 #endif 58 59 public int one_screen; 60 extern int less_is_more; 61 extern int missing_cap; 62 extern int know_dumb; 63 extern int pr_type; 64 extern int quit_if_one_screen; 65 extern int no_init; 66 extern int errmsgs; 67 extern int redraw_on_quit; 68 extern int term_init_done; 69 extern int first_time; 70 71 /* 72 * Entry point. 73 */ 74 int main(int argc, char *argv[]) 75 { 76 IFILE ifile; 77 char *s; 78 79 #ifdef __EMX__ 80 _response(&argc, &argv); 81 _wildcard(&argc, &argv); 82 #endif 83 84 progname = *argv++; 85 argc--; 86 87 #if SECURE 88 secure = 1; 89 #else 90 secure = 0; 91 s = lgetenv("LESSSECURE"); 92 if (!isnullenv(s)) 93 secure = 1; 94 #endif 95 96 #ifdef WIN32 97 if (getenv("HOME") == NULL) 98 { 99 /* 100 * If there is no HOME environment variable, 101 * try the concatenation of HOMEDRIVE + HOMEPATH. 102 */ 103 char *drive = getenv("HOMEDRIVE"); 104 char *path = getenv("HOMEPATH"); 105 if (drive != NULL && path != NULL) 106 { 107 char *env = (char *) ecalloc(strlen(drive) + 108 strlen(path) + 6, sizeof(char)); 109 strcpy(env, "HOME="); 110 strcat(env, drive); 111 strcat(env, path); 112 putenv(env); 113 } 114 } 115 GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char)); 116 #endif /* WIN32 */ 117 118 /* 119 * Process command line arguments and LESS environment arguments. 120 * Command line arguments override environment arguments. 121 */ 122 if (strcmp(getprogname(), "more") == 0) 123 more_mode = 1; 124 125 is_tty = isatty(1); 126 init_mark(); 127 init_cmds(); 128 init_poll(); 129 get_term(); 130 init_charset(); 131 init_line(); 132 init_cmdhist(); 133 init_option(); 134 init_search(); 135 136 /* 137 * If the name of the executable program is "more", 138 * act like LESS_IS_MORE is set. 139 */ 140 s = last_component(progname); 141 if (strcmp(s, "more") == 0) 142 less_is_more = 1; 143 144 init_prompt(); 145 146 s = lgetenv(less_is_more ? "MORE" : "LESS"); 147 if (s != NULL) 148 scan_option(s); 149 150 #define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0') 151 while (argc > 0 && (isoptstring(*argv) || isoptpending())) 152 { 153 s = *argv++; 154 argc--; 155 if (strcmp(s, "--") == 0) 156 break; 157 scan_option(s); 158 } 159 #undef isoptstring 160 161 if (isoptpending()) 162 { 163 /* 164 * Last command line option was a flag requiring a 165 * following string, but there was no following string. 166 */ 167 nopendopt(); 168 quit(QUIT_OK); 169 } 170 171 expand_cmd_tables(); 172 173 #if EDITOR 174 editor = lgetenv("VISUAL"); 175 if (editor == NULL || *editor == '\0') 176 { 177 editor = lgetenv("EDITOR"); 178 if (isnullenv(editor)) 179 editor = EDIT_PGM; 180 } 181 editproto = lgetenv("LESSEDIT"); 182 if (isnullenv(editproto)) 183 editproto = "%E ?lm+%lm. %g"; 184 #endif 185 186 /* 187 * Call get_ifile with all the command line filenames 188 * to "register" them with the ifile system. 189 */ 190 ifile = NULL_IFILE; 191 if (dohelp) 192 ifile = get_ifile(FAKE_HELPFILE, ifile); 193 while (argc-- > 0) 194 { 195 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC) 196 /* 197 * Because the "shell" doesn't expand filename patterns, 198 * treat each argument as a filename pattern rather than 199 * a single filename. 200 * Expand the pattern and iterate over the expanded list. 201 */ 202 struct textlist tlist; 203 char *filename; 204 char *gfilename; 205 char *qfilename; 206 207 gfilename = lglob(*argv++); 208 init_textlist(&tlist, gfilename); 209 filename = NULL; 210 while ((filename = forw_textlist(&tlist, filename)) != NULL) 211 { 212 qfilename = shell_unquote(filename); 213 (void) get_ifile(qfilename, ifile); 214 free(qfilename); 215 ifile = prev_ifile(NULL_IFILE); 216 } 217 free(gfilename); 218 #else 219 (void) get_ifile(*argv++, ifile); 220 ifile = prev_ifile(NULL_IFILE); 221 #endif 222 } 223 /* 224 * Set up terminal, etc. 225 */ 226 if (!is_tty) 227 { 228 /* 229 * Output is not a tty. 230 * Just copy the input file(s) to output. 231 */ 232 set_output(1); /* write to stdout */ 233 SET_BINARY(1); 234 if (edit_first() == 0) 235 { 236 do { 237 cat_file(); 238 } while (edit_next(1) == 0); 239 } 240 quit(QUIT_OK); 241 } 242 243 if (missing_cap && !know_dumb && !more_mode) 244 error("WARNING: terminal is not fully functional", NULL_PARG); 245 open_getchr(); 246 raw_mode(1); 247 init_signals(1); 248 249 /* 250 * Select the first file to examine. 251 */ 252 #if TAGS 253 if (tagoption != NULL || strcmp(tags, "-") == 0) 254 { 255 /* 256 * A -t option was given. 257 * Verify that no filenames were also given. 258 * Edit the file selected by the "tags" search, 259 * and search for the proper line in the file. 260 */ 261 if (nifile() > 0) 262 { 263 error("No filenames allowed with -t option", NULL_PARG); 264 quit(QUIT_ERROR); 265 } 266 findtag(tagoption); 267 if (edit_tagfile()) /* Edit file which contains the tag */ 268 quit(QUIT_ERROR); 269 /* 270 * Search for the line which contains the tag. 271 * Set up initial_scrpos so we display that line. 272 */ 273 initial_scrpos.pos = tagsearch(); 274 if (initial_scrpos.pos == NULL_POSITION) 275 quit(QUIT_ERROR); 276 initial_scrpos.ln = jump_sline; 277 } else 278 #endif 279 { 280 if (edit_first()) 281 quit(QUIT_ERROR); 282 /* 283 * See if file fits on one screen to decide whether 284 * to send terminal init. But don't need this 285 * if -X (no_init) overrides this (see init()). 286 */ 287 if (quit_if_one_screen) 288 { 289 if (nifile() > 1) /* If more than one file, -F cannot be used */ 290 quit_if_one_screen = FALSE; 291 else if (!no_init) 292 one_screen = get_one_screen(); 293 } 294 } 295 296 if (errmsgs > 0) 297 { 298 /* 299 * We displayed some messages on error output 300 * (file descriptor 2; see flush()). 301 * Before erasing the screen contents, wait for a keystroke. 302 */ 303 less_printf("Press RETURN to continue ", NULL_PARG); 304 get_return(); 305 putchr('\n'); 306 } 307 set_output(1); 308 init(); 309 commands(); 310 quit(QUIT_OK); 311 /*NOTREACHED*/ 312 return (0); 313 } 314 315 /* 316 * Copy a string to a "safe" place 317 * (that is, to a buffer allocated by calloc). 318 */ 319 public char * save(constant char *s) 320 { 321 char *p; 322 323 p = (char *) ecalloc(strlen(s)+1, sizeof(char)); 324 strcpy(p, s); 325 return (p); 326 } 327 328 public void out_of_memory(void) 329 { 330 error("Cannot allocate memory", NULL_PARG); 331 quit(QUIT_ERROR); 332 } 333 334 /* 335 * Allocate memory. 336 * Like calloc(), but never returns an error (NULL). 337 */ 338 public void * ecalloc(int count, unsigned int size) 339 { 340 void * p; 341 342 p = (void *) calloc(count, size); 343 if (p == NULL) 344 out_of_memory(); 345 return p; 346 } 347 348 /* 349 * Skip leading spaces in a string. 350 */ 351 public char * skipsp(char *s) 352 { 353 while (*s == ' ' || *s == '\t') 354 s++; 355 return (s); 356 } 357 358 /* 359 * See how many characters of two strings are identical. 360 * If uppercase is true, the first string must begin with an uppercase 361 * character; the remainder of the first string may be either case. 362 */ 363 public int sprefix(char *ps, char *s, int uppercase) 364 { 365 int c; 366 int sc; 367 int len = 0; 368 369 for ( ; *s != '\0'; s++, ps++) 370 { 371 c = *ps; 372 if (uppercase) 373 { 374 if (len == 0 && ASCII_IS_LOWER(c)) 375 return (-1); 376 if (ASCII_IS_UPPER(c)) 377 c = ASCII_TO_LOWER(c); 378 } 379 sc = *s; 380 if (len > 0 && ASCII_IS_UPPER(sc)) 381 sc = ASCII_TO_LOWER(sc); 382 if (c != sc) 383 break; 384 len++; 385 } 386 return (len); 387 } 388 389 /* 390 * Exit the program. 391 */ 392 public void quit(int status) 393 { 394 static int save_status; 395 396 /* 397 * Put cursor at bottom left corner, clear the line, 398 * reset the terminal modes, and exit. 399 */ 400 if (status < 0) 401 status = save_status; 402 else 403 save_status = status; 404 quitting = 1; 405 check_altpipe_error(); 406 if (interactive()) 407 clear_bot(); 408 deinit(); 409 flush(); 410 if (redraw_on_quit && term_init_done) 411 { 412 /* 413 * The last file text displayed might have been on an 414 * alternate screen, which now (since deinit) cannot be seen. 415 * redraw_on_quit tells us to redraw it on the main screen. 416 */ 417 first_time = 1; /* Don't print "skipping" or tildes */ 418 repaint(); 419 flush(); 420 } 421 edit((char*)NULL); 422 save_cmdhist(); 423 raw_mode(0); 424 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC 425 /* 426 * If we don't close 2, we get some garbage from 427 * 2's buffer when it flushes automatically. 428 * I cannot track this one down RB 429 * The same bug shows up if we use ^C^C to abort. 430 */ 431 close(2); 432 #endif 433 #ifdef WIN32 434 SetConsoleTitle(consoleTitle); 435 #endif 436 close_getchr(); 437 exit(status); 438 } 439
Indexes created Fri Jun 12 00:25:51 UTC 2026