1 /* 2 * Copyright (C) 1984-2009 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 init_search(); 122 123 /* 124 * If the name of the executable program is "more", 125 * act like LESS_IS_MORE is set. 126 */ 127 for (s = progname + strlen(progname); s > progname; s--) 128 { 129 if (s[-1] == PATHNAME_SEP[0]) 130 break; 131 } 132 if (strcmp(s, "more") == 0) 133 less_is_more = 1; 134 135 init_prompt(); 136 137 s = lgetenv(less_is_more ? "MORE" : "LESS"); 138 if (s != NULL) 139 scan_option(save(s)); 140 141 #define isoptstring(s) (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0') 142 while (argc > 0 && (isoptstring(*argv) || isoptpending())) 143 { 144 s = *argv++; 145 argc--; 146 if (strcmp(s, "--") == 0) 147 break; 148 scan_option(s); 149 } 150 #undef isoptstring 151 152 if (isoptpending()) 153 { 154 /* 155 * Last command line option was a flag requiring a 156 * following string, but there was no following string. 157 */ 158 nopendopt(); 159 quit(QUIT_OK); 160 } 161 162 if (less_is_more && get_quit_at_eof()) 163 quit_if_one_screen = TRUE; 164 165 #if EDITOR 166 editor = lgetenv("VISUAL"); 167 if (editor == NULL || *editor == '\0') 168 { 169 editor = lgetenv("EDITOR"); 170 if (editor == NULL || *editor == '\0') 171 editor = EDIT_PGM; 172 } 173 editproto = lgetenv("LESSEDIT"); 174 if (editproto == NULL || *editproto == '\0') 175 editproto = "%E ?lm+%lm. %f"; 176 #endif 177 178 /* 179 * Call get_ifile with all the command line filenames 180 * to "register" them with the ifile system. 181 */ 182 ifile = NULL_IFILE; 183 if (dohelp) 184 ifile = get_ifile(FAKE_HELPFILE, ifile); 185 while (argc-- > 0) 186 { 187 char *filename; 188 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC) 189 /* 190 * Because the "shell" doesn't expand filename patterns, 191 * treat each argument as a filename pattern rather than 192 * a single filename. 193 * Expand the pattern and iterate over the expanded list. 194 */ 195 struct textlist tlist; 196 char *gfilename; 197 198 gfilename = lglob(*argv++); 199 init_textlist(&tlist, gfilename); 200 filename = NULL; 201 while ((filename = forw_textlist(&tlist, filename)) != NULL) 202 { 203 (void) get_ifile(filename, ifile); 204 ifile = prev_ifile(NULL_IFILE); 205 } 206 free(gfilename); 207 #else 208 filename = shell_quote(*argv); 209 if (filename == NULL) 210 filename = *argv; 211 argv++; 212 (void) get_ifile(filename, ifile); 213 ifile = prev_ifile(NULL_IFILE); 214 #endif 215 } 216 /* 217 * Set up terminal, etc. 218 */ 219 if (!is_tty) 220 { 221 /* 222 * Output is not a tty. 223 * Just copy the input file(s) to output. 224 */ 225 SET_BINARY(1); 226 if (nifile() == 0) 227 { 228 if (edit_stdin() == 0) 229 cat_file(); 230 } else if (edit_first() == 0) 231 { 232 do { 233 cat_file(); 234 } while (edit_next(1) == 0); 235 } 236 quit(QUIT_OK); 237 } 238 239 if (missing_cap && !know_dumb) 240 error("WARNING: terminal is not fully functional", NULL_PARG); 241 init_mark(); 242 open_getchr(); 243 raw_mode(1); 244 init_signals(1); 245 246 /* 247 * Select the first file to examine. 248 */ 249 #if TAGS 250 if (tagoption != NULL || strcmp(tags, "-") == 0) 251 { 252 /* 253 * A -t option was given. 254 * Verify that no filenames were also given. 255 * Edit the file selected by the "tags" search, 256 * and search for the proper line in the file. 257 */ 258 if (nifile() > 0) 259 { 260 error("No filenames allowed with -t option", NULL_PARG); 261 quit(QUIT_ERROR); 262 } 263 findtag(tagoption); 264 if (edit_tagfile()) /* Edit file which contains the tag */ 265 quit(QUIT_ERROR); 266 /* 267 * Search for the line which contains the tag. 268 * Set up initial_scrpos so we display that line. 269 */ 270 initial_scrpos.pos = tagsearch(); 271 if (initial_scrpos.pos == NULL_POSITION) 272 quit(QUIT_ERROR); 273 initial_scrpos.ln = jump_sline; 274 } else 275 #endif 276 if (nifile() == 0) 277 { 278 if (edit_stdin()) /* Edit standard input */ 279 quit(QUIT_ERROR); 280 } else 281 { 282 if (edit_first()) /* Edit first valid file in cmd line */ 283 quit(QUIT_ERROR); 284 } 285 286 init(); 287 commands(); 288 quit(QUIT_OK); 289 /*NOTREACHED*/ 290 return (0); 291 } 292 293 /* 294 * Copy a string to a "safe" place 295 * (that is, to a buffer allocated by calloc). 296 */ 297 public char * 298 save(s) 299 char *s; 300 { 301 register char *p; 302 303 p = (char *) ecalloc(strlen(s)+1, sizeof(char)); 304 strcpy(p, s); 305 return (p); 306 } 307 308 /* 309 * Allocate memory. 310 * Like calloc(), but never returns an error (NULL). 311 */ 312 public VOID_POINTER 313 ecalloc(count, size) 314 int count; 315 unsigned int size; 316 { 317 register VOID_POINTER p; 318 319 p = (VOID_POINTER) calloc(count, size); 320 if (p != NULL) 321 return (p); 322 error("Cannot allocate memory", NULL_PARG); 323 quit(QUIT_ERROR); 324 /*NOTREACHED*/ 325 return (NULL); 326 } 327 328 /* 329 * Skip leading spaces in a string. 330 */ 331 public char * 332 skipsp(s) 333 register char *s; 334 { 335 while (*s == ' ' || *s == '\t') 336 s++; 337 return (s); 338 } 339 340 /* 341 * See how many characters of two strings are identical. 342 * If uppercase is true, the first string must begin with an uppercase 343 * character; the remainder of the first string may be either case. 344 */ 345 public int 346 sprefix(ps, s, uppercase) 347 char *ps; 348 char *s; 349 int uppercase; 350 { 351 register int c; 352 register int sc; 353 register int len = 0; 354 355 for ( ; *s != '\0'; s++, ps++) 356 { 357 c = *ps; 358 if (uppercase) 359 { 360 if (len == 0 && ASCII_IS_LOWER(c)) 361 return (-1); 362 if (ASCII_IS_UPPER(c)) 363 c = ASCII_TO_LOWER(c); 364 } 365 sc = *s; 366 if (len > 0 && ASCII_IS_UPPER(sc)) 367 sc = ASCII_TO_LOWER(sc); 368 if (c != sc) 369 break; 370 len++; 371 } 372 return (len); 373 } 374 375 /* 376 * Exit the program. 377 */ 378 public void 379 quit(status) 380 int status; 381 { 382 static int save_status; 383 384 /* 385 * Put cursor at bottom left corner, clear the line, 386 * reset the terminal modes, and exit. 387 */ 388 if (status < 0) 389 status = save_status; 390 else 391 save_status = status; 392 quitting = 1; 393 edit((char*)NULL); 394 save_cmdhist(); 395 if (any_display && is_tty) 396 clear_bot(); 397 deinit(); 398 flush(); 399 raw_mode(0); 400 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC 401 /* 402 * If we don't close 2, we get some garbage from 403 * 2's buffer when it flushes automatically. 404 * I cannot track this one down RB 405 * The same bug shows up if we use ^C^C to abort. 406 */ 407 close(2); 408 #endif 409 #if WIN32 410 SetConsoleTitle(consoleTitle); 411 #endif 412 close_getchr(); 413 exit(status); 414 } 415