external/bsd/less/dist/main.c

   1 /*      $NetBSD: main.c,v 1.4 2013/09/04 19:44:21 tron Exp $    */
   2
   3 /*
   4  * Copyright (C) 1984-2012  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 #include <windows.h>
  20 #endif
  21
  22 public char *   every_first_cmd = NULL;
  23 public int      new_file;
  24 public int      is_tty;
  25 public IFILE    curr_ifile = NULL_IFILE;
  26 public IFILE    old_ifile = NULL_IFILE;
  27 public struct scrpos initial_scrpos;
  28 public int      any_display = FALSE;
  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 extern int      less_is_more;
  60 extern int      missing_cap;
  61 extern int      know_dumb;
  62 extern int      quit_if_one_screen;
  63 extern int      pr_type;
  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         if (strcmp(getprogname(), "more") == 0)
 117                 more_mode = 1;
 118
 119         is_tty = isatty(1);
 120         get_term();
 121         init_cmds();
 122         init_charset();
 123         init_line();
 124         init_cmdhist();
 125         init_option();
 126         init_search();
 127
 128         /*
 129          * If the name of the executable program is "more",
 130          * act like LESS_IS_MORE is set.
 131          */
 132         for (s = progname + strlen(progname);  s > progname;  s--)
 133         {
 134                 if (s[-1] == PATHNAME_SEP[0])
 135                         break;
 136         }
 137         if (strcmp(s, "more") == 0)
 138                 less_is_more = 1;
 139
 140         init_prompt();
 141
 142         s = lgetenv(less_is_more ? "MORE" : "LESS");
 143         if (s != NULL)
 144                 scan_option(save(s));
 145
 146 #define isoptstring(s)  (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
 147         while (argc > 0 && (isoptstring(*argv) || isoptpending()))
 148         {
 149                 s = *argv++;
 150                 argc--;
 151                 if (strcmp(s, "--") == 0)
 152                         break;
 153                 scan_option(s);
 154         }
 155 #undef isoptstring
 156
 157         if (isoptpending())
 158         {
 159                 /*
 160                  * Last command line option was a flag requiring a
 161                  * following string, but there was no following string.
 162                  */
 163                 nopendopt();
 164                 quit(QUIT_OK);
 165         }
 166
 167         if (less_is_more && get_quit_at_eof())
 168                 quit_if_one_screen = TRUE;
 169
 170 #if EDITOR
 171         editor = lgetenv("VISUAL");
 172         if (editor == NULL || *editor == '\0')
 173         {
 174                 editor = lgetenv("EDITOR");
 175                 if (editor == NULL || *editor == '\0')
 176                         editor = EDIT_PGM;
 177         }
 178         editproto = lgetenv("LESSEDIT");
 179         if (editproto == NULL || *editproto == '\0')
 180                 editproto = "%E ?lm+%lm. %f";
 181 #endif
 182
 183         /*
 184          * Call get_ifile with all the command line filenames
 185          * to "register" them with the ifile system.
 186          */
 187         ifile = NULL_IFILE;
 188         if (dohelp)
 189                 ifile = get_ifile(FAKE_HELPFILE, ifile);
 190         while (argc-- > 0)
 191         {
 192                 char *filename;
 193 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
 194                 /*
 195                  * Because the "shell" doesn't expand filename patterns,
 196                  * treat each argument as a filename pattern rather than
 197                  * a single filename.
 198                  * Expand the pattern and iterate over the expanded list.
 199                  */
 200                 struct textlist tlist;
 201                 char *gfilename;
 202
 203                 gfilename = lglob(*argv++);
 204                 init_textlist(&tlist, gfilename);
 205                 filename = NULL;
 206                 while ((filename = forw_textlist(&tlist, filename)) != NULL)
 207                 {
 208                         (void) get_ifile(filename, ifile);
 209                         ifile = prev_ifile(NULL_IFILE);
 210                 }
 211                 free(gfilename);
 212 #else
 213                 filename = shell_quote(*argv);
 214                 if (filename == NULL)
 215                         filename = *argv;
 216                 argv++;
 217                 (void) get_ifile(filename, ifile);
 218                 ifile = prev_ifile(NULL_IFILE);
 219                 free(filename);
 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 && !more_mode)
 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         } else
 287         {
 288                 if (edit_first())  /* Edit first valid file in cmd line */
 289                         quit(QUIT_ERROR);
 290         }
 291
 292         init();
 293         commands();
 294         quit(QUIT_OK);
 295         /*NOTREACHED*/
 296         return (0);
 297 }
 298
 299 /*
 300  * Copy a string to a "safe" place
 301  * (that is, to a buffer allocated by calloc).
 302  */
 303         public char *
 304 save(s)
 305         char *s;
 306 {
 307         register char *p;
 308
 309         p = (char *) ecalloc(strlen(s)+1, sizeof(char));
 310         strcpy(p, s);
 311         return (p);
 312 }
 313
 314 /*
 315  * Allocate memory.
 316  * Like calloc(), but never returns an error (NULL).
 317  */
 318         public VOID_POINTER
 319 ecalloc(count, size)
 320         int count;
 321         unsigned int size;
 322 {
 323         register VOID_POINTER p;
 324
 325         p = (VOID_POINTER) calloc(count, size);
 326         if (p != NULL)
 327                 return (p);
 328         error("Cannot allocate memory", NULL_PARG);
 329         quit(QUIT_ERROR);
 330         /*NOTREACHED*/
 331         return (NULL);
 332 }
 333
 334 /*
 335  * Skip leading spaces in a string.
 336  */
 337         public char *
 338 skipsp(s)
 339         register char *s;
 340 {
 341         while (*s == ' ' || *s == '\t')
 342                 s++;
 343         return (s);
 344 }
 345
 346 /*
 347  * See how many characters of two strings are identical.
 348  * If uppercase is true, the first string must begin with an uppercase
 349  * character; the remainder of the first string may be either case.
 350  */
 351         public int
 352 sprefix(ps, s, uppercase)
 353         char *ps;
 354         char *s;
 355         int uppercase;
 356 {
 357         register int c;
 358         register int sc;
 359         register int len = 0;
 360
 361         for ( ;  *s != '\0';  s++, ps++)
 362         {
 363                 c = *ps;
 364                 if (uppercase)
 365                 {
 366                         if (len == 0 && ASCII_IS_LOWER(c))
 367                                 return (-1);
 368                         if (ASCII_IS_UPPER(c))
 369                                 c = ASCII_TO_LOWER(c);
 370                 }
 371                 sc = *s;
 372                 if (len > 0 && ASCII_IS_UPPER(sc))
 373                         sc = ASCII_TO_LOWER(sc);
 374                 if (c != sc)
 375                         break;
 376                 len++;
 377         }
 378         return (len);
 379 }
 380
 381 /*
 382  * Exit the program.
 383  */
 384         public void
 385 quit(status)
 386         int status;
 387 {
 388         static int save_status;
 389
 390         /*
 391          * Put cursor at bottom left corner, clear the line,
 392          * reset the terminal modes, and exit.
 393          */
 394         if (status < 0)
 395                 status = save_status;
 396         else
 397                 save_status = status;
 398         quitting = 1;
 399         edit((char*)NULL);
 400         save_cmdhist();
 401         if (any_display && is_tty)
 402                 clear_bot();
 403         deinit();
 404         flush();
 405         raw_mode(0);
 406 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
 407         /*
 408          * If we don't close 2, we get some garbage from
 409          * 2's buffer when it flushes automatically.
 410          * I cannot track this one down  RB
 411          * The same bug shows up if we use ^C^C to abort.
 412          */
 413         close(2);
 414 #endif
 415 #ifdef WIN32
 416         SetConsoleTitle(consoleTitle);
 417 #endif
 418         close_getchr();
 419         exit(status);
 420 }