src/termcap.c

   1 /* Work-alike for termcap, plus extra features.
   2    Copyright (C) 1985, 1986, 1993, 1994, 1995, 2000, 2001, 2002, 2003,
   3                  2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; see the file COPYING.  If not, write to
  17 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18 Boston, MA 02110-1301, USA.  */
  19
  20 /* Emacs config.h may rename various library functions such as malloc.  */
  21 #ifdef HAVE_CONFIG_H
  22 #include <config.h>
  23 #endif
  24
  25 #ifdef emacs
  26
  27 #include <lisp.h>               /* xmalloc is here */
  28 /* Get the O_* definitions for open et al.  */
  29 #include <sys/file.h>
  30 #ifdef HAVE_FCNTL_H
  31 #include <fcntl.h>
  32 #endif
  33 #ifdef HAVE_UNISTD_H
  34 #include <unistd.h>
  35 #endif
  36
  37 #else /* not emacs */
  38
  39 #ifdef STDC_HEADERS
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #else
  43 char *getenv ();
  44 char *malloc ();
  45 char *realloc ();
  46 #endif
  47
  48 /* Do this after the include, in case string.h prototypes bcopy.  */
  49 #if (defined(HAVE_STRING_H) || defined(STDC_HEADERS)) && !defined(bcopy)
  50 #define bcopy(s, d, n) memcpy ((d), (s), (n))
  51 #endif
  52
  53 #ifdef HAVE_UNISTD_H
  54 #include <unistd.h>
  55 #endif
  56 #ifdef HAVE_FCNTL_H
  57 #include <fcntl.h>
  58 #endif
  59
  60 #endif /* not emacs */
  61
  62 #ifndef NULL
  63 #define NULL (char *) 0
  64 #endif
  65
  66 #ifndef O_RDONLY
  67 #define O_RDONLY 0
  68 #endif
  69
  70 /* BUFSIZE is the initial size allocated for the buffer
  71    for reading the termcap file.
  72    It is not a limit.
  73    Make it large normally for speed.
  74    Make it variable when debugging, so can exercise
  75    increasing the space dynamically.  */
  76
  77 #ifndef BUFSIZE
  78 #ifdef DEBUG
  79 #define BUFSIZE bufsize
  80
  81 int bufsize = 128;
  82 #else
  83 #define BUFSIZE 2048
  84 #endif
  85 #endif
  86
  87 #ifndef TERMCAP_FILE
  88 #define TERMCAP_FILE "/etc/termcap"
  89 #endif
  90
  91 #ifndef emacs
  92 static void
  93 memory_out ()
  94 {
  95   write (2, "virtual memory exhausted\n", 25);
  96   exit (1);
  97 }
  98
  99 static char *
 100 xmalloc (size)
 101      unsigned size;
 102 {
 103   register char *tem = malloc (size);
 104
 105   if (!tem)
 106     memory_out ();
 107   return tem;
 108 }
 109
 110 static char *
 111 xrealloc (ptr, size)
 112      char *ptr;
 113      unsigned size;
 114 {
 115   register char *tem = realloc (ptr, size);
 116
 117   if (!tem)
 118     memory_out ();
 119   return tem;
 120 }
 121 #endif /* not emacs */
 122 \f
 123 /* Looking up capabilities in the entry already found.  */
 124
 125 /* The pointer to the data made by tgetent is left here
 126    for tgetnum, tgetflag and tgetstr to find.  */
 127 static char *term_entry;
 128
 129 static char *tgetst1 ();
 130
 131 /* Search entry BP for capability CAP.
 132    Return a pointer to the capability (in BP) if found,
 133    0 if not found.  */
 134
 135 static char *
 136 find_capability (bp, cap)
 137      register char *bp, *cap;
 138 {
 139   for (; *bp; bp++)
 140     if (bp[0] == ':'
 141         && bp[1] == cap[0]
 142         && bp[2] == cap[1])
 143       return &bp[4];
 144   return NULL;
 145 }
 146
 147 /* These are already defined in the System framework in Mac OS X and
 148    cause prebinding to fail.  */
 149 #ifndef MAC_OSX
 150 int
 151 tgetnum (cap)
 152      char *cap;
 153 {
 154   register char *ptr = find_capability (term_entry, cap);
 155   if (!ptr || ptr[-1] != '#')
 156     return -1;
 157   return atoi (ptr);
 158 }
 159
 160 int
 161 tgetflag (cap)
 162      char *cap;
 163 {
 164   register char *ptr = find_capability (term_entry, cap);
 165   return ptr && ptr[-1] == ':';
 166 }
 167
 168 /* Look up a string-valued capability CAP.
 169    If AREA is non-null, it points to a pointer to a block in which
 170    to store the string.  That pointer is advanced over the space used.
 171    If AREA is null, space is allocated with `malloc'.  */
 172
 173 char *
 174 tgetstr (cap, area)
 175      char *cap;
 176      char **area;
 177 {
 178   register char *ptr = find_capability (term_entry, cap);
 179   if (!ptr || (ptr[-1] != '=' && ptr[-1] != '~'))
 180     return NULL;
 181   return tgetst1 (ptr, area);
 182 }
 183 #endif /* MAC_OSX */
 184
 185 #ifdef IS_EBCDIC_HOST
 186 /* Table, indexed by a character in range 0200 to 0300 with 0200 subtracted,
 187    gives meaning of character following \, or a space if no special meaning.
 188    Sixteen characters per line within the string.  */
 189
 190 static char esctab[]
 191   = " \057\026  \047\014         \
 192      \025   \015      \
 193    \005 \013          \
 194                 ";
 195 #else
 196 /* Table, indexed by a character in range 0100 to 0140 with 0100 subtracted,
 197    gives meaning of character following \, or a space if no special meaning.
 198    Eight characters per line within the string.  */
 199
 200 static char esctab[]
 201   = " \007\010  \033\014 \
 202       \012 \
 203   \015 \011 \013 \
 204         ";
 205 #endif
 206
 207 /* PTR points to a string value inside a termcap entry.
 208    Copy that value, processing \ and ^ abbreviations,
 209    into the block that *AREA points to,
 210    or to newly allocated storage if AREA is NULL.
 211    Return the address to which we copied the value,
 212    or NULL if PTR is NULL.  */
 213
 214 static char *
 215 tgetst1 (ptr, area)
 216      char *ptr;
 217      char **area;
 218 {
 219   register char *p, *r;
 220   register int c;
 221   register int size;
 222   char *ret;
 223   register int c1;
 224
 225   if (!ptr)
 226     return NULL;
 227
 228   /* `ret' gets address of where to store the string.  */
 229   if (!area)
 230     {
 231       /* Compute size of block needed (may overestimate).  */
 232       p = ptr;
 233       while ((c = *p++) && c != ':' && c != '\n')
 234         ;
 235       ret = (char *) xmalloc (p - ptr + 1);
 236     }
 237   else
 238     ret = *area;
 239
 240   /* Copy the string value, stopping at null or colon.
 241      Also process ^ and \ abbreviations.  */
 242   p = ptr;
 243   r = ret;
 244   while ((c = *p++) && c != ':' && c != '\n')
 245     {
 246       if (c == '^')
 247         {
 248           c = *p++;
 249           if (c == '?')
 250             c = 0177;
 251           else
 252             c &= 037;
 253         }
 254       else if (c == '\\')
 255         {
 256           c = *p++;
 257           if (c >= '0' && c <= '7')
 258             {
 259               c -= '0';
 260               size = 0;
 261
 262               while (++size < 3 && (c1 = *p) >= '0' && c1 <= '7')
 263                 {
 264                   c *= 8;
 265                   c += c1 - '0';
 266                   p++;
 267                 }
 268             }
 269 #ifdef IS_EBCDIC_HOST
 270           else if (c >= 0200 && c < 0360)
 271             {
 272               c1 = esctab[(c & ~0100) - 0200];
 273               if (c1 != ' ')
 274                 c = c1;
 275             }
 276 #else
 277           else if (c >= 0100 && c < 0200)
 278             {
 279               c1 = esctab[(c & ~040) - 0100];
 280               if (c1 != ' ')
 281                 c = c1;
 282             }
 283 #endif
 284         }
 285       *r++ = c;
 286     }
 287
 288   /* Sometimes entries have "%pN" which means use parameter N in the
 289      next %-substitution.  If all such N are continuous in the range
 290      [1,9] we can remove each "%pN" because they are redundant, thus
 291      reducing bandwidth requirements.  True, Emacs is well beyond the
 292      days of 150baud teletypes, but some of its users aren't much so.
 293
 294      This pass could probably be integrated into the one above but
 295      abbreviation expansion makes that effort a little more hairy than
 296      its worth; this is cleaner.  */
 297   {
 298     register int last_p_param = 0;
 299     int remove_p_params = 1;
 300     struct { char *beg; int len; } cut[11];
 301
 302     for (cut[0].beg = p = ret; p < r - 3; p++)
 303       {
 304         if (!remove_p_params)
 305           break;
 306         if (*p == '%' && *(p + 1) == 'p')
 307           {
 308             if (*(p + 2) - '0' == 1 + last_p_param)
 309               {
 310                 cut[last_p_param].len = p - cut[last_p_param].beg;
 311                 last_p_param++;
 312                 p += 3;
 313                 cut[last_p_param].beg = p;
 314               }
 315             else                                /* not continuous: bail */
 316               remove_p_params = 0;
 317             if (last_p_param > 10)              /* too many: bail */
 318               remove_p_params = 0;
 319           }
 320       }
 321     if (remove_p_params && last_p_param)
 322       {
 323         register int i;
 324         char *wp;
 325
 326         cut[last_p_param].len = r - cut[last_p_param].beg;
 327         for (i = 0, wp = ret; i <= last_p_param; wp += cut[i++].len)
 328           bcopy (cut[i].beg, wp, cut[i].len);
 329         r = wp;
 330       }
 331   }
 332
 333   *r = '\0';
 334   /* Update *AREA.  */
 335   if (area)
 336     *area = r + 1;
 337   return ret;
 338 }
 339 \f
 340 /* Outputting a string with padding.  */
 341
 342 #ifndef emacs
 343 short ospeed;
 344 /* If OSPEED is 0, we use this as the actual baud rate.  */
 345 int tputs_baud_rate;
 346 #endif
 347
 348 /* Already defined in the System framework in Mac OS X and causes
 349    prebinding to fail.  */
 350 #ifndef MAC_OSX
 351 char PC;
 352 #endif  /* MAC_OSX */
 353
 354 #ifndef emacs
 355 /* Actual baud rate if positive;
 356    - baud rate / 100 if negative.  */
 357
 358 static int speeds[] =
 359   {
 360 #ifdef VMS
 361     0, 50, 75, 110, 134, 150, -3, -6, -12, -18,
 362     -20, -24, -36, -48, -72, -96, -192
 363 #else /* not VMS */
 364     0, 50, 75, 110, 135, 150, -2, -3, -6, -12,
 365     -18, -24, -48, -96, -192, -288, -384, -576, -1152
 366 #endif /* not VMS */
 367   };
 368
 369 #endif /* not emacs */
 370
 371 /* Already defined in the System framework in Mac OS X and causes
 372    prebinding to fail.  */
 373 #ifndef MAC_OSX
 374 void
 375 tputs (str, nlines, outfun)
 376      register char *str;
 377      int nlines;
 378      register int (*outfun) ();
 379 {
 380   register int padcount = 0;
 381   register int speed;
 382
 383 #ifdef emacs
 384   extern EMACS_INT baud_rate;
 385   speed = baud_rate;
 386   /* For quite high speeds, convert to the smaller
 387      units to avoid overflow.  */
 388   if (speed > 10000)
 389     speed = - speed / 100;
 390 #else
 391   if (ospeed == 0)
 392     speed = tputs_baud_rate;
 393   else
 394     speed = speeds[ospeed];
 395 #endif
 396
 397   if (!str)
 398     return;
 399
 400   while (*str >= '0' && *str <= '9')
 401     {
 402       padcount += *str++ - '0';
 403       padcount *= 10;
 404     }
 405   if (*str == '.')
 406     {
 407       str++;
 408       padcount += *str++ - '0';
 409     }
 410   if (*str == '*')
 411     {
 412       str++;
 413       padcount *= nlines;
 414     }
 415   while (*str)
 416     (*outfun) (*str++);
 417
 418   /* PADCOUNT is now in units of tenths of msec.
 419      SPEED is measured in characters per 10 seconds
 420      or in characters per .1 seconds (if negative).
 421      We use the smaller units for larger speeds to avoid overflow.  */
 422   padcount *= speed;
 423   padcount += 500;
 424   padcount /= 1000;
 425   if (speed < 0)
 426     padcount = -padcount;
 427   else
 428     {
 429       padcount += 50;
 430       padcount /= 100;
 431     }
 432
 433   while (padcount-- > 0)
 434     (*outfun) (PC);
 435 }
 436 #endif /* MAC_OSX */
 437 \f
 438 /* Finding the termcap entry in the termcap data base.  */
 439
 440 struct termcap_buffer
 441   {
 442     char *beg;
 443     int size;
 444     char *ptr;
 445     int ateof;
 446     int full;
 447   };
 448
 449 /* Forward declarations of static functions.  */
 450
 451 static int scan_file ();
 452 static char *gobble_line ();
 453 static int compare_contin ();
 454 static int name_match ();
 455
 456 #ifdef VMS
 457
 458 #include <rmsdef.h>
 459 #include <fab.h>
 460 #include <nam.h>
 461 #include <starlet.h>
 462
 463 static int
 464 valid_filename_p (fn)
 465      char *fn;
 466 {
 467   struct FAB fab = cc$rms_fab;
 468   struct NAM nam = cc$rms_nam;
 469   char esa[NAM$C_MAXRSS];
 470
 471   fab.fab$l_fna = fn;
 472   fab.fab$b_fns = strlen(fn);
 473   fab.fab$l_nam = &nam;
 474   fab.fab$l_fop = FAB$M_NAM;
 475
 476   nam.nam$l_esa = esa;
 477   nam.nam$b_ess = sizeof esa;
 478
 479   return SYS$PARSE(&fab, 0, 0) == RMS$_NORMAL;
 480 }
 481
 482 #else /* !VMS */
 483
 484 #ifdef MSDOS /* MW, May 1993 */
 485 static int
 486 valid_filename_p (fn)
 487      char *fn;
 488 {
 489   return *fn == '/' || fn[1] == ':';
 490 }
 491 #else
 492 #define valid_filename_p(fn) (*(fn) == '/')
 493 #endif
 494
 495 #endif /* !VMS */
 496
 497 /* Find the termcap entry data for terminal type NAME
 498    and store it in the block that BP points to.
 499    Record its address for future use.
 500
 501    If BP is null, space is dynamically allocated.
 502
 503    Return -1 if there is some difficulty accessing the data base
 504    of terminal types,
 505    0 if the data base is accessible but the type NAME is not defined
 506    in it, and some other value otherwise.  */
 507
 508 /* Already defined in the System framework in Mac OS X and causes
 509    prebinding to fail.  */
 510 #ifndef MAC_OSX
 511 int
 512 tgetent (bp, name)
 513      char *bp, *name;
 514 {
 515   register char *termcap_name;
 516   register int fd;
 517   struct termcap_buffer buf;
 518   register char *bp1;
 519   char *tc_search_point;
 520   char *term;
 521   int malloc_size = 0;
 522   register int c;
 523   char *tcenv = NULL;           /* TERMCAP value, if it contains :tc=.  */
 524   char *indirect = NULL;        /* Terminal type in :tc= in TERMCAP value.  */
 525   int filep;
 526
 527 #ifdef INTERNAL_TERMINAL
 528   /* For the internal terminal we don't want to read any termcap file,
 529      so fake it.  */
 530   if (!strcmp (name, "internal"))
 531     {
 532       term = INTERNAL_TERMINAL;
 533       if (!bp)
 534         {
 535           malloc_size = 1 + strlen (term);
 536           bp = (char *) xmalloc (malloc_size);
 537         }
 538       strcpy (bp, term);
 539       goto ret;
 540     }
 541 #endif /* INTERNAL_TERMINAL */
 542
 543   /* For compatibility with programs like `less' that want to
 544      put data in the termcap buffer themselves as a fallback.  */
 545   if (bp)
 546     term_entry = bp;
 547
 548   termcap_name = getenv ("TERMCAP");
 549   if (termcap_name && *termcap_name == '\0')
 550     termcap_name = NULL;
 551 #if defined (MSDOS) && !defined (TEST)
 552   if (termcap_name && (*termcap_name == '\\'
 553                        || *termcap_name == '/'
 554                        || termcap_name[1] == ':'))
 555     dostounix_filename(termcap_name);
 556 #endif
 557
 558   filep = termcap_name && valid_filename_p (termcap_name);
 559
 560   /* If termcap_name is non-null and starts with / (in the un*x case, that is),
 561      it is a file name to use instead of /etc/termcap.
 562      If it is non-null and does not start with /,
 563      it is the entry itself, but only if
 564      the name the caller requested matches the TERM variable.  */
 565
 566   if (termcap_name && !filep && !strcmp (name, getenv ("TERM")))
 567     {
 568       indirect = tgetst1 (find_capability (termcap_name, "tc"), (char **) 0);
 569       if (!indirect)
 570         {
 571           if (!bp)
 572             bp = termcap_name;
 573           else
 574             strcpy (bp, termcap_name);
 575           goto ret;
 576         }
 577       else
 578         {                       /* It has tc=.  Need to read /etc/termcap.  */
 579           tcenv = termcap_name;
 580           termcap_name = NULL;
 581         }
 582     }
 583
 584   if (!termcap_name || !filep)
 585     termcap_name = TERMCAP_FILE;
 586
 587   /* Here we know we must search a file and termcap_name has its name.  */
 588
 589 #ifdef MSDOS
 590   fd = open (termcap_name, O_RDONLY|O_TEXT, 0);
 591 #else
 592   fd = open (termcap_name, O_RDONLY, 0);
 593 #endif
 594   if (fd < 0)
 595     return -1;
 596
 597   buf.size = BUFSIZE;
 598   /* Add 1 to size to ensure room for terminating null.  */
 599   buf.beg = (char *) xmalloc (buf.size + 1);
 600   term = indirect ? indirect : name;
 601
 602   if (!bp)
 603     {
 604       malloc_size = indirect ? strlen (tcenv) + 1 : buf.size;
 605       bp = (char *) xmalloc (malloc_size);
 606     }
 607   tc_search_point = bp1 = bp;
 608
 609   if (indirect)
 610     /* Copy the data from the environment variable.  */
 611     {
 612       strcpy (bp, tcenv);
 613       bp1 += strlen (tcenv);
 614     }
 615
 616   while (term)
 617     {
 618       /* Scan the file, reading it via buf, till find start of main entry.  */
 619       if (scan_file (term, fd, &buf) == 0)
 620         {
 621           close (fd);
 622           free (buf.beg);
 623           if (malloc_size)
 624             free (bp);
 625           return 0;
 626         }
 627
 628       /* Free old `term' if appropriate.  */
 629       if (term != name)
 630         free (term);
 631
 632       /* If BP is malloc'd by us, make sure it is big enough.  */
 633       if (malloc_size)
 634         {
 635           int offset1 = bp1 - bp, offset2 = tc_search_point - bp;
 636           malloc_size = offset1 + buf.size;
 637           bp = termcap_name = (char *) xrealloc (bp, malloc_size);
 638           bp1 = termcap_name + offset1;
 639           tc_search_point = termcap_name + offset2;
 640         }
 641
 642       /* Copy the line of the entry from buf into bp.  */
 643       termcap_name = buf.ptr;
 644       while ((*bp1++ = c = *termcap_name++) && c != '\n')
 645         /* Drop out any \ newline sequence.  */
 646         if (c == '\\' && *termcap_name == '\n')
 647           {
 648             bp1--;
 649             termcap_name++;
 650           }
 651       *bp1 = '\0';
 652
 653       /* Does this entry refer to another terminal type's entry?
 654          If something is found, copy it into heap and null-terminate it.  */
 655       tc_search_point = find_capability (tc_search_point, "tc");
 656       term = tgetst1 (tc_search_point, (char **) 0);
 657     }
 658
 659   close (fd);
 660   free (buf.beg);
 661
 662   if (malloc_size)
 663     bp = (char *) xrealloc (bp, bp1 - bp + 1);
 664
 665  ret:
 666   term_entry = bp;
 667   return 1;
 668 }
 669 #endif /* MAC_OSX */
 670
 671 /* Given file open on FD and buffer BUFP,
 672    scan the file from the beginning until a line is found
 673    that starts the entry for terminal type STR.
 674    Return 1 if successful, with that line in BUFP,
 675    or 0 if no entry is found in the file.  */
 676
 677 static int
 678 scan_file (str, fd, bufp)
 679      char *str;
 680      int fd;
 681      register struct termcap_buffer *bufp;
 682 {
 683   register char *end;
 684
 685   bufp->ptr = bufp->beg;
 686   bufp->full = 0;
 687   bufp->ateof = 0;
 688   *bufp->ptr = '\0';
 689
 690   lseek (fd, 0L, 0);
 691
 692   while (!bufp->ateof)
 693     {
 694       /* Read a line into the buffer.  */
 695       end = NULL;
 696       do
 697         {
 698           /* if it is continued, append another line to it,
 699              until a non-continued line ends.  */
 700           end = gobble_line (fd, bufp, end);
 701         }
 702       while (!bufp->ateof && end[-2] == '\\');
 703
 704       if (*bufp->ptr != '#'
 705           && name_match (bufp->ptr, str))
 706         return 1;
 707
 708       /* Discard the line just processed.  */
 709       bufp->ptr = end;
 710     }
 711   return 0;
 712 }
 713
 714 /* Return nonzero if NAME is one of the names specified
 715    by termcap entry LINE.  */
 716
 717 static int
 718 name_match (line, name)
 719      char *line, *name;
 720 {
 721   register char *tem;
 722
 723   if (!compare_contin (line, name))
 724     return 1;
 725   /* This line starts an entry.  Is it the right one?  */
 726   for (tem = line; *tem && *tem != '\n' && *tem != ':'; tem++)
 727     if (*tem == '|' && !compare_contin (tem + 1, name))
 728       return 1;
 729
 730   return 0;
 731 }
 732
 733 static int
 734 compare_contin (str1, str2)
 735      register char *str1, *str2;
 736 {
 737   register int c1, c2;
 738   while (1)
 739     {
 740       c1 = *str1++;
 741       c2 = *str2++;
 742       while (c1 == '\\' && *str1 == '\n')
 743         {
 744           str1++;
 745           while ((c1 = *str1++) == ' ' || c1 == '\t');
 746         }
 747       if (c2 == '\0')
 748         {
 749           /* End of type being looked up.  */
 750           if (c1 == '|' || c1 == ':')
 751             /* If end of name in data base, we win.  */
 752             return 0;
 753           else
 754             return 1;
 755         }
 756       else if (c1 != c2)
 757         return 1;
 758     }
 759 }
 760
 761 /* Make sure that the buffer <- BUFP contains a full line
 762    of the file open on FD, starting at the place BUFP->ptr
 763    points to.  Can read more of the file, discard stuff before
 764    BUFP->ptr, or make the buffer bigger.
 765
 766    Return the pointer to after the newline ending the line,
 767    or to the end of the file, if there is no newline to end it.
 768
 769    Can also merge on continuation lines.  If APPEND_END is
 770    non-null, it points past the newline of a line that is
 771    continued; we add another line onto it and regard the whole
 772    thing as one line.  The caller decides when a line is continued.  */
 773
 774 static char *
 775 gobble_line (fd, bufp, append_end)
 776      int fd;
 777      register struct termcap_buffer *bufp;
 778      char *append_end;
 779 {
 780   register char *end;
 781   register int nread;
 782   register char *buf = bufp->beg;
 783   register char *tem;
 784
 785   if (!append_end)
 786     append_end = bufp->ptr;
 787
 788   while (1)
 789     {
 790       end = append_end;
 791       while (*end && *end != '\n') end++;
 792       if (*end)
 793         break;
 794       if (bufp->ateof)
 795         return buf + bufp->full;
 796       if (bufp->ptr == buf)
 797         {
 798           if (bufp->full == bufp->size)
 799             {
 800               bufp->size *= 2;
 801               /* Add 1 to size to ensure room for terminating null.  */
 802               tem = (char *) xrealloc (buf, bufp->size + 1);
 803               bufp->ptr = (bufp->ptr - buf) + tem;
 804               append_end = (append_end - buf) + tem;
 805               bufp->beg = buf = tem;
 806             }
 807         }
 808       else
 809         {
 810           append_end -= bufp->ptr - buf;
 811           bcopy (bufp->ptr, buf, bufp->full -= bufp->ptr - buf);
 812           bufp->ptr = buf;
 813         }
 814       if (!(nread = read (fd, buf + bufp->full, bufp->size - bufp->full)))
 815         bufp->ateof = 1;
 816       bufp->full += nread;
 817       buf[bufp->full] = '\0';
 818     }
 819   return end + 1;
 820 }
 821 \f
 822 #ifdef TEST
 823
 824 #ifdef NULL
 825 #undef NULL
 826 #endif
 827
 828 #include <stdio.h>
 829
 830 main (argc, argv)
 831      int argc;
 832      char **argv;
 833 {
 834   char *term;
 835   char *buf;
 836
 837   term = argv[1];
 838   printf ("TERM: %s\n", term);
 839
 840   buf = (char *) tgetent (0, term);
 841   if ((int) buf <= 0)
 842     {
 843       printf ("No entry.\n");
 844       return 0;
 845     }
 846
 847   printf ("Entry: %s\n", buf);
 848
 849   tprint ("cm");
 850   tprint ("AL");
 851
 852   printf ("co: %d\n", tgetnum ("co"));
 853   printf ("am: %d\n", tgetflag ("am"));
 854 }
 855
 856 tprint (cap)
 857      char *cap;
 858 {
 859   char *x = tgetstr (cap, 0);
 860   register char *y;
 861
 862   printf ("%s: ", cap);
 863   if (x)
 864     {
 865       for (y = x; *y; y++)
 866         if (*y <= ' ' || *y == 0177)
 867           printf ("\\%0o", *y);
 868         else
 869           putchar (*y);
 870       free (x);
 871     }
 872   else
 873     printf ("none");
 874   putchar ('\n');
 875 }
 876
 877 #endif /* TEST */
 878
 879 /* arch-tag: c2e8d427-2271-4fac-95fe-411857238b80
 880    (do not change this comment) */