contrib/less-381/main.c

   1 /*
   2  * Copyright (C) 1984-2002  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
  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 extern int      missing_cap;
  58 extern int      know_dumb;
  59
  60
  61 /*
  62  * Entry point.
  63  */
  64 int
  65 main(argc, argv)
  66         int argc;
  67         char *argv[];
  68 {
  69         IFILE ifile;
  70         char *s;
  71
  72 #ifdef __EMX__
  73         _response(&argc, &argv);
  74         _wildcard(&argc, &argv);
  75 #endif
  76
  77         progname = *argv++;
  78         argc--;
  79
  80         secure = 0;
  81         s = lgetenv("LESSSECURE");
  82         if (s != NULL && *s != '\0')
  83                 secure = 1;
  84
  85 #ifdef WIN32
  86         if (getenv("HOME") == NULL)
  87         {
  88                 /*
  89                  * If there is no HOME environment variable,
  90                  * try the concatenation of HOMEDRIVE + HOMEPATH.
  91                  */
  92                 char *drive = getenv("HOMEDRIVE");
  93                 char *path  = getenv("HOMEPATH");
  94                 if (drive != NULL && path != NULL)
  95                 {
  96                         char *env = (char *) ecalloc(strlen(drive) +
  97                                         strlen(path) + 6, sizeof(char));
  98                         strcpy(env, "HOME=");
  99                         strcat(env, drive);
 100                         strcat(env, path);
 101                         putenv(env);
 102                 }
 103         }
 104         GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char));
 105 #endif /* WIN32 */
 106
 107         /*
 108          * Process command line arguments and LESS environment arguments.
 109          * Command line arguments override environment arguments.
 110          */
 111         is_tty = isatty(1);
 112         get_term();
 113         init_cmds();
 114         init_prompt();
 115         init_charset();
 116         init_line();
 117         init_option();
 118         s = lgetenv("LESS");
 119         if (s != NULL)
 120                 scan_option(save(s));
 121
 122 #define isoptstring(s)  (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
 123         while (argc > 0 && (isoptstring(*argv) || isoptpending()))
 124         {
 125                 s = *argv++;
 126                 argc--;
 127                 if (strcmp(s, "--") == 0)
 128                         break;
 129                 scan_option(s);
 130         }
 131 #undef isoptstring
 132
 133         if (isoptpending())
 134         {
 135                 /*
 136                  * Last command line option was a flag requiring a
 137                  * following string, but there was no following string.
 138                  */
 139                 nopendopt();
 140                 quit(QUIT_OK);
 141         }
 142
 143 #if EDITOR
 144         editor = lgetenv("VISUAL");
 145         if (editor == NULL || *editor == '\0')
 146         {
 147                 editor = lgetenv("EDITOR");
 148                 if (editor == NULL || *editor == '\0')
 149                         editor = EDIT_PGM;
 150         }
 151         editproto = lgetenv("LESSEDIT");
 152         if (editproto == NULL || *editproto == '\0')
 153                 editproto = "%E ?lm+%lm. %f";
 154 #endif
 155
 156         /*
 157          * Call get_ifile with all the command line filenames
 158          * to "register" them with the ifile system.
 159          */
 160         ifile = NULL_IFILE;
 161         if (dohelp)
 162                 ifile = get_ifile(FAKE_HELPFILE, ifile);
 163         while (argc-- > 0)
 164         {
 165                 char *filename;
 166 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
 167                 /*
 168                  * Because the "shell" doesn't expand filename patterns,
 169                  * treat each argument as a filename pattern rather than
 170                  * a single filename.
 171                  * Expand the pattern and iterate over the expanded list.
 172                  */
 173                 struct textlist tlist;
 174                 char *gfilename;
 175
 176                 gfilename = lglob(*argv++);
 177                 init_textlist(&tlist, gfilename);
 178                 filename = NULL;
 179                 while ((filename = forw_textlist(&tlist, filename)) != NULL)
 180                 {
 181                         (void) get_ifile(filename, ifile);
 182                         ifile = prev_ifile(NULL_IFILE);
 183                 }
 184                 free(gfilename);
 185 #else
 186                 filename = shell_quote(*argv);
 187                 if (filename == NULL)
 188                         filename = *argv;
 189                 argv++;
 190                 (void) get_ifile(filename, ifile);
 191                 ifile = prev_ifile(NULL_IFILE);
 192 #endif
 193         }
 194         /*
 195          * Set up terminal, etc.
 196          */
 197         if (!is_tty)
 198         {
 199                 /*
 200                  * Output is not a tty.
 201                  * Just copy the input file(s) to output.
 202                  */
 203                 SET_BINARY(1);
 204                 if (nifile() == 0)
 205                 {
 206                         if (edit_stdin() == 0)
 207                                 cat_file();
 208                 } else if (edit_first() == 0)
 209                 {
 210                         do {
 211                                 cat_file();
 212                         } while (edit_next(1) == 0);
 213                 }
 214                 quit(QUIT_OK);
 215         }
 216
 217         if (missing_cap && !know_dumb)
 218                 error("WARNING: terminal is not fully functional", NULL_PARG);
 219         init_mark();
 220         open_getchr();
 221         raw_mode(1);
 222         init_signals(1);
 223
 224         /*
 225          * Select the first file to examine.
 226          */
 227 #if TAGS
 228         if (tagoption != NULL || strcmp(tags, "-") == 0)
 229         {
 230                 /*
 231                  * A -t option was given.
 232                  * Verify that no filenames were also given.
 233                  * Edit the file selected by the "tags" search,
 234                  * and search for the proper line in the file.
 235                  */
 236                 if (nifile() > 0)
 237                 {
 238                         error("No filenames allowed with -t option", NULL_PARG);
 239                         quit(QUIT_ERROR);
 240                 }
 241                 findtag(tagoption);
 242                 if (edit_tagfile())  /* Edit file which contains the tag */
 243                         quit(QUIT_ERROR);
 244                 /*
 245                  * Search for the line which contains the tag.
 246                  * Set up initial_scrpos so we display that line.
 247                  */
 248                 initial_scrpos.pos = tagsearch();
 249                 if (initial_scrpos.pos == NULL_POSITION)
 250                         quit(QUIT_ERROR);
 251                 initial_scrpos.ln = jump_sline;
 252         } else
 253 #endif
 254         if (nifile() == 0)
 255         {
 256                 if (edit_stdin())  /* Edit standard input */
 257                         quit(QUIT_ERROR);
 258         } else
 259         {
 260                 if (edit_first())  /* Edit first valid file in cmd line */
 261                         quit(QUIT_ERROR);
 262         }
 263
 264         init();
 265         commands();
 266         quit(QUIT_OK);
 267         /*NOTREACHED*/
 268         return (0);
 269 }
 270
 271 /*
 272  * Copy a string to a "safe" place
 273  * (that is, to a buffer allocated by calloc).
 274  */
 275         public char *
 276 save(s)
 277         char *s;
 278 {
 279         register char *p;
 280
 281         p = (char *) ecalloc(strlen(s)+1, sizeof(char));
 282         strcpy(p, s);
 283         return (p);
 284 }
 285
 286 /*
 287  * Allocate memory.
 288  * Like calloc(), but never returns an error (NULL).
 289  */
 290         public VOID_POINTER
 291 ecalloc(count, size)
 292         int count;
 293         unsigned int size;
 294 {
 295         register VOID_POINTER p;
 296
 297         p = (VOID_POINTER) calloc(count, size);
 298         if (p != NULL)
 299                 return (p);
 300         error("Cannot allocate memory", NULL_PARG);
 301         quit(QUIT_ERROR);
 302         /*NOTREACHED*/
 303         return (NULL);
 304 }
 305
 306 /*
 307  * Skip leading spaces in a string.
 308  */
 309         public char *
 310 skipsp(s)
 311         register char *s;
 312 {
 313         while (*s == ' ' || *s == '\t')
 314                 s++;
 315         return (s);
 316 }
 317
 318 /*
 319  * See how many characters of two strings are identical.
 320  * If uppercase is true, the first string must begin with an uppercase
 321  * character; the remainder of the first string may be either case.
 322  */
 323         public int
 324 sprefix(ps, s, uppercase)
 325         char *ps;
 326         char *s;
 327         int uppercase;
 328 {
 329         register int c;
 330         register int sc;
 331         register int len = 0;
 332
 333         for ( ;  *s != '\0';  s++, ps++)
 334         {
 335                 c = *ps;
 336                 if (uppercase)
 337                 {
 338                         if (len == 0 && SIMPLE_IS_LOWER(c))
 339                                 return (-1);
 340                         if (SIMPLE_IS_UPPER(c))
 341                                 c = SIMPLE_TO_LOWER(c);
 342                 }
 343                 sc = *s;
 344                 if (len > 0 && SIMPLE_IS_UPPER(sc))
 345                         sc = SIMPLE_TO_LOWER(sc);
 346                 if (c != sc)
 347                         break;
 348                 len++;
 349         }
 350         return (len);
 351 }
 352
 353 /*
 354  * Exit the program.
 355  */
 356         public void
 357 quit(status)
 358         int status;
 359 {
 360         static int save_status;
 361
 362         /*
 363          * Put cursor at bottom left corner, clear the line,
 364          * reset the terminal modes, and exit.
 365          */
 366         if (status < 0)
 367                 status = save_status;
 368         else
 369                 save_status = status;
 370         quitting = 1;
 371         edit((char*)NULL);
 372         if (any_display && is_tty)
 373                 clear_bot();
 374         deinit();
 375         flush();
 376         raw_mode(0);
 377 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
 378         /*
 379          * If we don't close 2, we get some garbage from
 380          * 2's buffer when it flushes automatically.
 381          * I cannot track this one down  RB
 382          * The same bug shows up if we use ^C^C to abort.
 383          */
 384         close(2);
 385 #endif
 386 #if WIN32
 387         SetConsoleTitle(consoleTitle);
 388 #endif
 389         close_getchr();
 390         exit(status);
 391 }