contrib/less-4/main.c

   1 /*
   2  * Copyright (C) 1984-2007  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
 122         /*
 123          * If the name of the executable program is "more",
 124          * act like LESS_IS_MORE is set.
 125          */
 126         for (s = progname + strlen(progname);  s > progname;  s--)
 127         {
 128                 if (s[-1] == PATHNAME_SEP[0])
 129                         break;
 130         }
 131         if (strcmp(s, "more") == 0)
 132                 less_is_more = 1;
 133
 134         init_prompt();
 135
 136         s = lgetenv(less_is_more ? "MORE" : "LESS");
 137         if (s != NULL)
 138                 scan_option(save(s));
 139
 140 #define isoptstring(s)  (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
 141         while (argc > 0 && (isoptstring(*argv) || isoptpending()))
 142         {
 143                 s = *argv++;
 144                 argc--;
 145                 if (strcmp(s, "--") == 0)
 146                         break;
 147                 scan_option(s);
 148         }
 149 #undef isoptstring
 150
 151         if (isoptpending())
 152         {
 153                 /*
 154                  * Last command line option was a flag requiring a
 155                  * following string, but there was no following string.
 156                  */
 157                 nopendopt();
 158                 quit(QUIT_OK);
 159         }
 160
 161         if (less_is_more && get_quit_at_eof())
 162                 quit_if_one_screen = TRUE;
 163
 164 #if EDITOR
 165         editor = lgetenv("VISUAL");
 166         if (editor == NULL || *editor == '\0')
 167         {
 168                 editor = lgetenv("EDITOR");
 169                 if (editor == NULL || *editor == '\0')
 170                         editor = EDIT_PGM;
 171         }
 172         editproto = lgetenv("LESSEDIT");
 173         if (editproto == NULL || *editproto == '\0')
 174                 editproto = "%E ?lm+%lm. %f";
 175 #endif
 176
 177         /*
 178          * Call get_ifile with all the command line filenames
 179          * to "register" them with the ifile system.
 180          */
 181         ifile = NULL_IFILE;
 182         if (dohelp)
 183                 ifile = get_ifile(FAKE_HELPFILE, ifile);
 184         while (argc-- > 0)
 185         {
 186                 char *filename;
 187 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
 188                 /*
 189                  * Because the "shell" doesn't expand filename patterns,
 190                  * treat each argument as a filename pattern rather than
 191                  * a single filename.
 192                  * Expand the pattern and iterate over the expanded list.
 193                  */
 194                 struct textlist tlist;
 195                 char *gfilename;
 196
 197                 gfilename = lglob(*argv++);
 198                 init_textlist(&tlist, gfilename);
 199                 filename = NULL;
 200                 while ((filename = forw_textlist(&tlist, filename)) != NULL)
 201                 {
 202                         (void) get_ifile(filename, ifile);
 203                         ifile = prev_ifile(NULL_IFILE);
 204                 }
 205                 free(gfilename);
 206 #else
 207                 filename = shell_quote(*argv);
 208                 if (filename == NULL)
 209                         filename = *argv;
 210                 argv++;
 211                 (void) get_ifile(filename, ifile);
 212                 ifile = prev_ifile(NULL_IFILE);
 213 #endif
 214         }
 215         /*
 216          * Set up terminal, etc.
 217          */
 218         if (!is_tty)
 219         {
 220                 /*
 221                  * Output is not a tty.
 222                  * Just copy the input file(s) to output.
 223                  */
 224                 SET_BINARY(1);
 225                 if (nifile() == 0)
 226                 {
 227                         if (edit_stdin() == 0)
 228                                 cat_file();
 229                 } else if (edit_first() == 0)
 230                 {
 231                         do {
 232                                 cat_file();
 233                         } while (edit_next(1) == 0);
 234                 }
 235                 quit(QUIT_OK);
 236         }
 237
 238         if (missing_cap && !know_dumb)
 239                 error("WARNING: terminal is not fully functional", NULL_PARG);
 240         init_mark();
 241         open_getchr();
 242         raw_mode(1);
 243         init_signals(1);
 244
 245         /*
 246          * Select the first file to examine.
 247          */
 248 #if TAGS
 249         if (tagoption != NULL || strcmp(tags, "-") == 0)
 250         {
 251                 /*
 252                  * A -t option was given.
 253                  * Verify that no filenames were also given.
 254                  * Edit the file selected by the "tags" search,
 255                  * and search for the proper line in the file.
 256                  */
 257                 if (nifile() > 0)
 258                 {
 259                         error("No filenames allowed with -t option", NULL_PARG);
 260                         quit(QUIT_ERROR);
 261                 }
 262                 findtag(tagoption);
 263                 if (edit_tagfile())  /* Edit file which contains the tag */
 264                         quit(QUIT_ERROR);
 265                 /*
 266                  * Search for the line which contains the tag.
 267                  * Set up initial_scrpos so we display that line.
 268                  */
 269                 initial_scrpos.pos = tagsearch();
 270                 if (initial_scrpos.pos == NULL_POSITION)
 271                         quit(QUIT_ERROR);
 272                 initial_scrpos.ln = jump_sline;
 273         } else
 274 #endif
 275         if (nifile() == 0)
 276         {
 277                 if (edit_stdin())  /* Edit standard input */
 278                         quit(QUIT_ERROR);
 279         } else
 280         {
 281                 if (edit_first())  /* Edit first valid file in cmd line */
 282                         quit(QUIT_ERROR);
 283         }
 284
 285         init();
 286         commands();
 287         quit(QUIT_OK);
 288         /*NOTREACHED*/
 289         return (0);
 290 }
 291
 292 /*
 293  * Copy a string to a "safe" place
 294  * (that is, to a buffer allocated by calloc).
 295  */
 296         public char *
 297 save(s)
 298         char *s;
 299 {
 300         register char *p;
 301
 302         p = (char *) ecalloc(strlen(s)+1, sizeof(char));
 303         strcpy(p, s);
 304         return (p);
 305 }
 306
 307 /*
 308  * Allocate memory.
 309  * Like calloc(), but never returns an error (NULL).
 310  */
 311         public VOID_POINTER
 312 ecalloc(count, size)
 313         int count;
 314         unsigned int size;
 315 {
 316         register VOID_POINTER p;
 317
 318         p = (VOID_POINTER) calloc(count, size);
 319         if (p != NULL)
 320                 return (p);
 321         error("Cannot allocate memory", NULL_PARG);
 322         quit(QUIT_ERROR);
 323         /*NOTREACHED*/
 324         return (NULL);
 325 }
 326
 327 /*
 328  * Skip leading spaces in a string.
 329  */
 330         public char *
 331 skipsp(s)
 332         register char *s;
 333 {
 334         while (*s == ' ' || *s == '\t')
 335                 s++;
 336         return (s);
 337 }
 338
 339 /*
 340  * See how many characters of two strings are identical.
 341  * If uppercase is true, the first string must begin with an uppercase
 342  * character; the remainder of the first string may be either case.
 343  */
 344         public int
 345 sprefix(ps, s, uppercase)
 346         char *ps;
 347         char *s;
 348         int uppercase;
 349 {
 350         register int c;
 351         register int sc;
 352         register int len = 0;
 353
 354         for ( ;  *s != '\0';  s++, ps++)
 355         {
 356                 c = *ps;
 357                 if (uppercase)
 358                 {
 359                         if (len == 0 && ASCII_IS_LOWER(c))
 360                                 return (-1);
 361                         if (ASCII_IS_UPPER(c))
 362                                 c = ASCII_TO_LOWER(c);
 363                 }
 364                 sc = *s;
 365                 if (len > 0 && ASCII_IS_UPPER(sc))
 366                         sc = ASCII_TO_LOWER(sc);
 367                 if (c != sc)
 368                         break;
 369                 len++;
 370         }
 371         return (len);
 372 }
 373
 374 /*
 375  * Exit the program.
 376  */
 377         public void
 378 quit(status)
 379         int status;
 380 {
 381         static int save_status;
 382
 383         /*
 384          * Put cursor at bottom left corner, clear the line,
 385          * reset the terminal modes, and exit.
 386          */
 387         if (status < 0)
 388                 status = save_status;
 389         else
 390                 save_status = status;
 391         quitting = 1;
 392         edit((char*)NULL);
 393         save_cmdhist();
 394         if (any_display && is_tty)
 395                 clear_bot();
 396         deinit();
 397         flush();
 398         raw_mode(0);
 399 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
 400         /*
 401          * If we don't close 2, we get some garbage from
 402          * 2's buffer when it flushes automatically.
 403          * I cannot track this one down  RB
 404          * The same bug shows up if we use ^C^C to abort.
 405          */
 406         close(2);
 407 #endif
 408 #if WIN32
 409         SetConsoleTitle(consoleTitle);
 410 #endif
 411         close_getchr();
 412         exit(status);
 413 }