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 77 #ifdef __EMX__ 78 _response(&argc, &argv); 79 _wildcard(&argc, &argv); 80 #endif 81 82 progname = *argv++; 83 argc--; 84 85 secure = 0; 86 s = lgetenv("LESSSECURE"); 87 if (s != NULL && *s != '\0') 88 secure = 1; 89 90 #ifdef WIN32 91 if (getenv("HOME") == NULL) 92 { 93 /* 94 * If there is no HOME environment variable, 95 * try the concatenation of HOMEDRIVE + HOMEPATH. 96 */ 97 char *drive = getenv("HOMEDRIVE"); 98 char *path = getenv("HOMEPATH"); 99 if (drive != NULL && path != NULL) 100 { 101 char *env = (char *) ecalloc(strlen(drive) + 102 strlen(path) + 6, sizeof(char)); 103 strcpy(env, "HOME="); 104 strcat(env, drive); 105 strcat(env, path); 106 putenv(env); 107 } 108 } 109 GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char)); 110 #endif /* WIN32 */ 111 112 /* 113 * Process command line arguments and LESS environment arguments. 114 * Command line arguments override environment arguments. 115 */ 116 is_tty = isatty(1); 117 init_cmds(); 118 get_term(); 119 expand_cmd_tables(); 120 init_charset(); 121 init_line(); 122 init_cmdhist(); 123 init_option(); 124 init_search(); 125 126 /* 127 * If the name of the executable program is "more", 128 * act like LESS_IS_MORE is set. 129 */ 130 for (s = progname + strlen(progname); s > progname; s--) 131 { 132 if (s[-1] == PATHNAME_SEP[0]) 133 break; 134 } 135 if (strcmp(s, "more") == 0) 136 less_is_more = 1; 137 138 init_prompt(); 139 140 if (less_is_more) 141 scan_option("-fG"); 142 143 s = lgetenv(less_is_more ? "MORE" : "LESS"); 144 if (s != NULL) 145 scan_option(save(s)); 146 147 #define isoptstring(s) less_is_more ? (((s)[0] == '-') && (s)[1] != '\0') : \ 148 (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0') 149 while (argc > 0 && (isoptstring(*argv) || isoptpending())) 150 { 151 s = *argv++; 152 argc--; 153 if (strcmp(s, "--") == 0) 154 break; 155 scan_option(s); 156 } 157 #undef isoptstring 158 159 if (isoptpending()) 160 { 161 /* 162 * Last command line option was a flag requiring a 163 * following string, but there was no following string. 164 */ 165 nopendopt(); 166 quit(QUIT_OK); 167 } 168 169 if (less_is_more) 170 no_init = TRUE; 171 172 #if EDITOR 173 editor = lgetenv("VISUAL"); 174 if (editor == NULL || *editor == '\0') 175 { 176 editor = lgetenv("EDITOR"); 177 if (editor == NULL || *editor == '\0') 178 editor = EDIT_PGM; 179 } 180 editproto = lgetenv("LESSEDIT"); 181 if (editproto == NULL || *editproto == '\0') 182 editproto = "%E ?lm+%lm. %f"; 183 #endif 184 185 /* 186 * Call get_ifile with all the command line filenames 187 * to "register" them with the ifile system. 188 */ 189 ifile = NULL_IFILE; 190 if (dohelp) 191 ifile = get_ifile(FAKE_HELPFILE, ifile); 192 while (argc-- > 0) 193 { 194 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC) 195 /* 196 * Because the "shell" doesn't expand filename patterns, 197 * treat each argument as a filename pattern rather than 198 * a single filename. 199 * Expand the pattern and iterate over the expanded list. 200 */ 201 struct textlist tlist; 202 char *filename; 203 char *gfilename; 204 char *qfilename; 205 206 gfilename = lglob(*argv++); 207 init_textlist(&tlist, gfilename); 208 filename = NULL; 209 while ((filename = forw_textlist(&tlist, filename)) != NULL) 210 { 211 qfilename = shell_unquote(filename); 212 (void) get_ifile(qfilename, ifile); 213 free(qfilename); 214 ifile = prev_ifile(NULL_IFILE); 215 } 216 free(gfilename); 217 #else 218 (void) get_ifile(*argv++, ifile); 219 ifile = prev_ifile(NULL_IFILE); 220 #endif 221 } 222 /* 223 * Set up terminal, etc. 224 */ 225 if (!is_tty) 226 { 227 /* 228 * Output is not a tty. 229 * Just copy the input file(s) to output. 230 */ 231 SET_BINARY(1); 232 if (nifile() == 0) 233 { 234 if (edit_stdin() == 0) 235 cat_file(); 236 } else if (edit_first() == 0) 237 { 238 do { 239 cat_file(); 240 } while (edit_next(1) == 0); 241 } 242 quit(QUIT_OK); 243 } 244 245 if (missing_cap && !know_dumb && !less_is_more) 246 error("WARNING: terminal is not fully functional", NULL_PARG); 247 init_mark(); 248 open_getchr(); 249 raw_mode(1); 250 init_signals(1); 251 252 /* 253 * Select the first file to examine. 254 */ 255 #if TAGS 256 if (tagoption != NULL || strcmp(tags, "-") == 0) 257 { 258 /* 259 * A -t option was given. 260 * Verify that no filenames were also given. 261 * Edit the file selected by the "tags" search, 262 * and search for the proper line in the file. 263 */ 264 if (nifile() > 0) 265 { 266 error("No filenames allowed with -t option", NULL_PARG); 267 quit(QUIT_ERROR); 268 } 269 findtag(tagoption); 270 if (edit_tagfile()) /* Edit file which contains the tag */ 271 quit(QUIT_ERROR); 272 /* 273 * Search for the line which contains the tag. 274 * Set up initial_scrpos so we display that line. 275 */ 276 initial_scrpos.pos = tagsearch(); 277 if (initial_scrpos.pos == NULL_POSITION) 278 quit(QUIT_ERROR); 279 initial_scrpos.ln = jump_sline; 280 } else 281 #endif 282 if (nifile() == 0) 283 { 284 if (edit_stdin()) /* Edit standard input */ 285 quit(QUIT_ERROR); 286 if (quit_if_one_screen) 287 line_count = get_line_count(); 288 } else 289 { 290 if (edit_first()) /* Edit first valid file in cmd line */ 291 quit(QUIT_ERROR); 292 if (quit_if_one_screen) 293 { 294 if (nifile() == 1) 295 line_count = get_line_count(); 296 else /* If more than one file, -F can not be used */ 297 quit_if_one_screen = FALSE; 298 } 299 } 300 301 init(); 302 commands(); 303 quit(QUIT_OK); 304 /*NOTREACHED*/ 305 return (0); 306 } 307 308 /* 309 * Copy a string to a "safe" place 310 * (that is, to a buffer allocated by calloc). 311 */ 312 public char * 313 save(s) 314 constant char *s; 315 { 316 char *p; 317 318 p = (char *) ecalloc(strlen(s)+1, sizeof(char)); 319 strcpy(p, s); 320 return (p); 321 } 322 323 /* 324 * Allocate memory. 325 * Like calloc(), but never returns an error (NULL). 326 */ 327 public VOID_POINTER 328 ecalloc(count, size) 329 int count; 330 unsigned int size; 331 { 332 VOID_POINTER p; 333 334 p = (VOID_POINTER) calloc(count, size); 335 if (p != NULL) 336 return (p); 337 error("Cannot allocate memory", NULL_PARG); 338 quit(QUIT_ERROR); 339 /*NOTREACHED*/ 340 return (NULL); 341 } 342 343 /* 344 * Skip leading spaces in a string. 345 */ 346 public char * 347 skipsp(s) 348 char *s; 349 { 350 while (*s == ' ' || *s == '\t') 351 s++; 352 return (s); 353 } 354 355 /* 356 * See how many characters of two strings are identical. 357 * If uppercase is true, the first string must begin with an uppercase 358 * character; the remainder of the first string may be either case. 359 */ 360 public int 361 sprefix(ps, s, uppercase) 362 char *ps; 363 char *s; 364 int uppercase; 365 { 366 int c; 367 int sc; 368 int len = 0; 369 370 for ( ; *s != '\0'; s++, ps++) 371 { 372 c = *ps; 373 if (uppercase) 374 { 375 if (len == 0 && ASCII_IS_LOWER(c)) 376 return (-1); 377 if (ASCII_IS_UPPER(c)) 378 c = ASCII_TO_LOWER(c); 379 } 380 sc = *s; 381 if (len > 0 && ASCII_IS_UPPER(sc)) 382 sc = ASCII_TO_LOWER(sc); 383 if (c != sc) 384 break; 385 len++; 386 } 387 return (len); 388 } 389 390 /* 391 * Exit the program. 392 */ 393 public void 394 quit(status) 395 int status; 396 { 397 static int save_status; 398 399 /* 400 * Put cursor at bottom left corner, clear the line, 401 * reset the terminal modes, and exit. 402 */ 403 if (status < 0) 404 status = save_status; 405 else 406 save_status = status; 407 quitting = 1; 408 edit((char*)NULL); 409 save_cmdhist(); 410 if (any_display && is_tty) 411 clear_bot(); 412 deinit(); 413 flush(); 414 raw_mode(0); 415 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC 416 /* 417 * If we don't close 2, we get some garbage from 418 * 2's buffer when it flushes automatically. 419 * I cannot track this one down RB 420 * The same bug shows up if we use ^C^C to abort. 421 */ 422 close(2); 423 #endif 424 #ifdef WIN32 425 SetConsoleTitle(consoleTitle); 426 #endif 427 close_getchr(); 428 exit(status); 429 } 430