1 /* $FreeBSD$ */ 2 /* 3 * Copyright (C) 1984-2017 Mark Nudelman 4 * 5 * You may distribute under the terms of either the GNU General Public 6 * License or the Less License, as specified in the README file. 7 * 8 * For more information, 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 36 #if LOGFILE 37 public int logfile = -1; 38 public int force_logfile = FALSE; 39 public char * namelogfile = NULL; 40 #endif 41 42 #if EDITOR 43 public char * editor; 44 public char * editproto; 45 #endif 46 47 #if TAGS 48 extern char * tags; 49 extern char * tagoption; 50 extern int jump_sline; 51 #endif 52 53 #ifdef WIN32 54 static char consoleTitle[256]; 55 #endif 56 57 public int line_count; 58 extern int less_is_more; 59 extern int missing_cap; 60 extern int know_dumb; 61 extern int no_init; 62 extern int pr_type; 63 extern int quit_if_one_screen; 64 65 66 /* 67 * Entry point. 68 */ 69 int 70 main(argc, argv) 71 int argc; 72 char *argv[]; 73 { 74 IFILE ifile; 75 char *s; 76 extern char *__progname; 77 78 #ifdef __EMX__ 79 _response(&argc, &argv); 80 _wildcard(&argc, &argv); 81 #endif 82 83 progname = *argv++; 84 argc--; 85 86 secure = 0; 87 s = lgetenv("LESSSECURE"); 88 if (s != NULL && *s != '\0') 89 secure = 1; 90 91 #ifdef WIN32 92 if (getenv("HOME") == NULL) 93 { 94 /* 95 * If there is no HOME environment variable, 96 * try the concatenation of HOMEDRIVE + HOMEPATH. 97 */ 98 char *drive = getenv("HOMEDRIVE"); 99 char *path = getenv("HOMEPATH"); 100 if (drive != NULL && path != NULL) 101 { 102 char *env = (char *) ecalloc(strlen(drive) + 103 strlen(path) + 6, sizeof(char)); 104 strcpy(env, "HOME="); 105 strcat(env, drive); 106 strcat(env, path); 107 putenv(env); 108 } 109 } 110 GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char)); 111 #endif /* WIN32 */ 112 113 /* 114 * Process command line arguments and LESS environment arguments. 115 * Command line arguments override environment arguments. 116 */ 117 is_tty = isatty(1); 118 init_cmds(); 119 get_term(); 120 expand_cmd_tables(); 121 init_charset(); 122 init_line(); 123 init_cmdhist(); 124 init_option(); 125 init_search(); 126 127 /* 128 * If the name of the executable program is "more", 129 * act like LESS_IS_MORE is set. 130 */ 131 for (s = progname + strlen(progname); s > progname; s--) 132 { 133 if (s[-1] == PATHNAME_SEP[0]) 134 break; 135 } 136 if (strcmp(s, "more") == 0) 137 less_is_more = 1; 138 139 init_prompt(); 140 141 if (less_is_more) 142 scan_option("-fG"); 143 144 s = lgetenv(less_is_more ? "MORE" : "LESS"); 145 if (s != NULL) 146 scan_option(save(s)); 147 148 #define isoptstring(s) less_is_more ? (((s)[0] == '-') && (s)[1] != '\0') : \ 149 (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0') 150 while (argc > 0 && (isoptstring(*argv) || isoptpending())) 151 { 152 s = *argv++; 153 argc--; 154 if (strcmp(s, "--") == 0) 155 break; 156 scan_option(s); 157 } 158 #undef isoptstring 159 160 if (isoptpending()) 161 { 162 /* 163 * Last command line option was a flag requiring a 164 * following string, but there was no following string. 165 */ 166 nopendopt(); 167 quit(QUIT_OK); 168 } 169 170 if (less_is_more) 171 no_init = TRUE; 172 173 #if EDITOR 174 editor = lgetenv("VISUAL"); 175 if (editor == NULL || *editor == '\0') 176 { 177 editor = lgetenv("EDITOR"); 178 if (editor == NULL || *editor == '\0') 179 editor = EDIT_PGM; 180 } 181 editproto = lgetenv("LESSEDIT"); 182 if (editproto == NULL || *editproto == '\0') 183 editproto = "%E ?lm+%lm. %f"; 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_BINARY(1); 233 if (nifile() == 0) 234 { 235 if (edit_stdin() == 0) 236 cat_file(); 237 } else if (edit_first() == 0) 238 { 239 do { 240 cat_file(); 241 } while (edit_next(1) == 0); 242 } 243 quit(QUIT_OK); 244 } 245 246 if (missing_cap && !know_dumb && !less_is_more) 247 error("WARNING: terminal is not fully functional", NULL_PARG); 248 init_mark(); 249 open_getchr(); 250 raw_mode(1); 251 init_signals(1); 252 253 /* 254 * Select the first file to examine. 255 */ 256 #if TAGS 257 if (tagoption != NULL || strcmp(tags, "-") == 0) 258 { 259 /* 260 * A -t option was given. 261 * Verify that no filenames were also given. 262 * Edit the file selected by the "tags" search, 263 * and search for the proper line in the file. 264 */ 265 if (nifile() > 0) 266 { 267 error("No filenames allowed with -t option", NULL_PARG); 268 quit(QUIT_ERROR); 269 } 270 findtag(tagoption); 271 if (edit_tagfile()) /* Edit file which contains the tag */ 272 quit(QUIT_ERROR); 273 /* 274 * Search for the line which contains the tag. 275 * Set up initial_scrpos so we display that line. 276 */ 277 initial_scrpos.pos = tagsearch(); 278 if (initial_scrpos.pos == NULL_POSITION) 279 quit(QUIT_ERROR); 280 initial_scrpos.ln = jump_sline; 281 } else 282 #endif 283 if (nifile() == 0) 284 { 285 if (edit_stdin()) /* Edit standard input */ 286 quit(QUIT_ERROR); 287 if (quit_if_one_screen) 288 line_count = get_line_count(); 289 } else 290 { 291 if (edit_first()) /* Edit first valid file in cmd line */ 292 quit(QUIT_ERROR); 293 if (quit_if_one_screen) 294 { 295 if (nifile() == 1) 296 line_count = get_line_count(); 297 else /* If more than one file, -F can not be used */ 298 quit_if_one_screen = FALSE; 299 } 300 } 301 302 init(); 303 commands(); 304 quit(QUIT_OK); 305 /*NOTREACHED*/ 306 return (0); 307 } 308 309 /* 310 * Copy a string to a "safe" place 311 * (that is, to a buffer allocated by calloc). 312 */ 313 public char * 314 save(s) 315 constant char *s; 316 { 317 char *p; 318 319 p = (char *) ecalloc(strlen(s)+1, sizeof(char)); 320 strcpy(p, s); 321 return (p); 322 } 323 324 /* 325 * Allocate memory. 326 * Like calloc(), but never returns an error (NULL). 327 */ 328 public VOID_POINTER 329 ecalloc(count, size) 330 int count; 331 unsigned int size; 332 { 333 VOID_POINTER p; 334 335 p = (VOID_POINTER) calloc(count, size); 336 if (p != NULL) 337 return (p); 338 error("Cannot allocate memory", NULL_PARG); 339 quit(QUIT_ERROR); 340 /*NOTREACHED*/ 341 return (NULL); 342 } 343 344 /* 345 * Skip leading spaces in a string. 346 */ 347 public char * 348 skipsp(s) 349 char *s; 350 { 351 while (*s == ' ' || *s == '\t') 352 s++; 353 return (s); 354 } 355 356 /* 357 * See how many characters of two strings are identical. 358 * If uppercase is true, the first string must begin with an uppercase 359 * character; the remainder of the first string may be either case. 360 */ 361 public int 362 sprefix(ps, s, uppercase) 363 char *ps; 364 char *s; 365 int uppercase; 366 { 367 int c; 368 int sc; 369 int len = 0; 370 371 for ( ; *s != '\0'; s++, ps++) 372 { 373 c = *ps; 374 if (uppercase) 375 { 376 if (len == 0 && ASCII_IS_LOWER(c)) 377 return (-1); 378 if (ASCII_IS_UPPER(c)) 379 c = ASCII_TO_LOWER(c); 380 } 381 sc = *s; 382 if (len > 0 && ASCII_IS_UPPER(sc)) 383 sc = ASCII_TO_LOWER(sc); 384 if (c != sc) 385 break; 386 len++; 387 } 388 return (len); 389 } 390 391 /* 392 * Exit the program. 393 */ 394 public void 395 quit(status) 396 int status; 397 { 398 static int save_status; 399 400 /* 401 * Put cursor at bottom left corner, clear the line, 402 * reset the terminal modes, and exit. 403 */ 404 if (status < 0) 405 status = save_status; 406 else 407 save_status = status; 408 quitting = 1; 409 edit((char*)NULL); 410 save_cmdhist(); 411 if (any_display && is_tty) 412 clear_bot(); 413 deinit(); 414 flush(); 415 raw_mode(0); 416 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC 417 /* 418 * If we don't close 2, we get some garbage from 419 * 2's buffer when it flushes automatically. 420 * I cannot track this one down RB 421 * The same bug shows up if we use ^C^C to abort. 422 */ 423 close(2); 424 #endif 425 #ifdef WIN32 426 SetConsoleTitle(consoleTitle); 427 #endif 428 close_getchr(); 429 exit(status); 430 } 431