800 lines
17 KiB
C
800 lines
17 KiB
C
/* Work-alike for termcap, plus extra features.
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Copyright (C) 1985, 86, 93, 94, 95 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to the
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Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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/* Emacs config.h may rename various library functions such as malloc. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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/* Get the O_* definitions for open et al. */
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#if !defined (_MINIX) && defined (HAVE_SYS_FILE_H)
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# include <sys/file.h>
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#endif
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#include <fcntl.h>
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#ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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#else
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extern char *getenv ();
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extern char *malloc ();
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extern char *realloc ();
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#endif
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#else /* not HAVE_CONFIG_H */
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#ifdef STDC_HEADERS
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#include <stdlib.h>
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#include <string.h>
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#else
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char *getenv ();
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char *malloc ();
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char *realloc ();
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#endif
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/* Do this after the include, in case string.h prototypes bcopy. */
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#if (defined(HAVE_STRING_H) || defined(STDC_HEADERS)) && !defined(bcopy)
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#define bcopy(s, d, n) memcpy ((d), (s), (n))
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef _POSIX_VERSION
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#include <fcntl.h>
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#endif
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#endif /* not HAVE_CONFIG_H */
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#ifndef NULL
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#define NULL (char *) 0
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#endif
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#ifndef O_RDONLY
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#define O_RDONLY 0
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#endif
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/* BUFSIZE is the initial size allocated for the buffer
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for reading the termcap file.
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It is not a limit.
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Make it large normally for speed.
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Make it variable when debugging, so can exercise
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increasing the space dynamically. */
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#ifndef BUFSIZE
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#ifdef DEBUG
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#define BUFSIZE bufsize
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int bufsize = 128;
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#else
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#define BUFSIZE 2048
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#endif
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#endif
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#include "ltcap.h"
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#ifndef TERMCAP_FILE
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#define TERMCAP_FILE "/etc/termcap"
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#endif
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#ifndef emacs
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static void
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memory_out ()
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{
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write (2, "virtual memory exhausted\n", 25);
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exit (1);
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}
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static char *
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xmalloc (size)
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unsigned size;
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{
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register char *tem = malloc (size);
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if (!tem)
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memory_out ();
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return tem;
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}
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static char *
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xrealloc (ptr, size)
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char *ptr;
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unsigned size;
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{
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register char *tem = realloc (ptr, size);
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if (!tem)
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memory_out ();
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return tem;
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}
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#endif /* not emacs */
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/* Looking up capabilities in the entry already found. */
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/* The pointer to the data made by tgetent is left here
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for tgetnum, tgetflag and tgetstr to find. */
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static char *term_entry;
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static char *tgetst1 ();
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/* Search entry BP for capability CAP.
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Return a pointer to the capability (in BP) if found,
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0 if not found. */
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static char *
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find_capability (bp, cap)
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register char *bp, *cap;
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{
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for (; *bp; bp++)
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if (bp[0] == ':'
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&& bp[1] == cap[0]
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&& bp[2] == cap[1])
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return &bp[4];
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return NULL;
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}
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__private_extern__
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int
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tgetnum (cap)
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char *cap;
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{
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register char *ptr = find_capability (term_entry, cap);
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if (!ptr || ptr[-1] != '#')
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return -1;
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return atoi (ptr);
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}
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__private_extern__
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int
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tgetflag (cap)
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char *cap;
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{
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register char *ptr = find_capability (term_entry, cap);
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return ptr && ptr[-1] == ':';
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}
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/* Look up a string-valued capability CAP.
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If AREA is non-null, it points to a pointer to a block in which
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to store the string. That pointer is advanced over the space used.
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If AREA is null, space is allocated with `malloc'. */
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__private_extern__
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char *
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tgetstr (cap, area)
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char *cap;
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char **area;
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{
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register char *ptr = find_capability (term_entry, cap);
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if (!ptr || (ptr[-1] != '=' && ptr[-1] != '~'))
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return NULL;
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return tgetst1 (ptr, area);
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}
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/* Table, indexed by a character in range 0100 to 0140 with 0100 subtracted,
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gives meaning of character following \, or a space if no special meaning.
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Eight characters per line within the string. */
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static char esctab[]
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= " \007\010 \033\014 \
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\012 \
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\015 \011 \013 \
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";
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/* PTR points to a string value inside a termcap entry.
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Copy that value, processing \ and ^ abbreviations,
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into the block that *AREA points to,
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or to newly allocated storage if AREA is NULL.
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Return the address to which we copied the value,
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or NULL if PTR is NULL. */
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static char *
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tgetst1 (ptr, area)
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char *ptr;
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char **area;
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{
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register char *p, *r;
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register int c;
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register int size;
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char *ret;
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register int c1;
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if (!ptr)
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return NULL;
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/* `ret' gets address of where to store the string. */
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if (!area)
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{
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/* Compute size of block needed (may overestimate). */
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p = ptr;
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while ((c = *p++) && c != ':' && c != '\n')
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;
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ret = (char *) xmalloc (p - ptr + 1);
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}
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else
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ret = *area;
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/* Copy the string value, stopping at null or colon.
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Also process ^ and \ abbreviations. */
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p = ptr;
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r = ret;
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while ((c = *p++) && c != ':' && c != '\n')
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{
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if (c == '^')
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{
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c = *p++;
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if (c == '?')
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c = 0177;
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else
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c &= 037;
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}
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else if (c == '\\')
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{
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c = *p++;
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if (c >= '0' && c <= '7')
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{
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c -= '0';
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size = 0;
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while (++size < 3 && (c1 = *p) >= '0' && c1 <= '7')
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{
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c *= 8;
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c += c1 - '0';
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p++;
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}
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}
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else if (c >= 0100 && c < 0200)
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{
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c1 = esctab[(c & ~040) - 0100];
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if (c1 != ' ')
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c = c1;
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}
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}
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*r++ = c;
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}
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*r = '\0';
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/* Update *AREA. */
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if (area)
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*area = r + 1;
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return ret;
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}
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/* Outputting a string with padding. */
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short ospeed;
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/* If OSPEED is 0, we use this as the actual baud rate. */
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int tputs_baud_rate;
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__private_extern__ char PC = '\0';
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/* Actual baud rate if positive;
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- baud rate / 100 if negative. */
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static int speeds[] =
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{
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#ifdef VMS
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0, 50, 75, 110, 134, 150, -3, -6, -12, -18,
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-20, -24, -36, -48, -72, -96, -192
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#else /* not VMS */
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0, 50, 75, 110, 135, 150, -2, -3, -6, -12,
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-18, -24, -48, -96, -192, -288, -384, -576, -1152
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#endif /* not VMS */
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};
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__private_extern__
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void
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tputs (str, nlines, outfun)
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register char *str;
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int nlines;
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register int (*outfun) ();
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{
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register int padcount = 0;
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register int speed;
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#ifdef emacs
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extern baud_rate;
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speed = baud_rate;
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/* For quite high speeds, convert to the smaller
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units to avoid overflow. */
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if (speed > 10000)
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speed = - speed / 100;
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#else
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if (ospeed == 0)
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speed = tputs_baud_rate;
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else if (ospeed > 0 && ospeed < (sizeof speeds / sizeof speeds[0]))
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speed = speeds[ospeed];
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else
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speed = 0;
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#endif
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if (!str)
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return;
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while (*str >= '0' && *str <= '9')
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{
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padcount += *str++ - '0';
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padcount *= 10;
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}
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if (*str == '.')
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{
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str++;
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padcount += *str++ - '0';
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}
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if (*str == '*')
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{
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str++;
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padcount *= nlines;
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}
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while (*str)
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(*outfun) (*str++);
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/* PADCOUNT is now in units of tenths of msec.
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SPEED is measured in characters per 10 seconds
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or in characters per .1 seconds (if negative).
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We use the smaller units for larger speeds to avoid overflow. */
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padcount *= speed;
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padcount += 500;
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padcount /= 1000;
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if (speed < 0)
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padcount = -padcount;
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else
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{
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padcount += 50;
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padcount /= 100;
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}
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while (padcount-- > 0)
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(*outfun) (PC);
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}
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/* Finding the termcap entry in the termcap data base. */
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struct buffer
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{
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char *beg;
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int size;
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char *ptr;
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int ateof;
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int full;
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};
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/* Forward declarations of static functions. */
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static int scan_file ();
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static char *gobble_line ();
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static int compare_contin ();
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static int name_match ();
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#ifdef VMS
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#include <rmsdef.h>
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#include <fab.h>
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#include <nam.h>
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static int
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valid_filename_p (fn)
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char *fn;
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{
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struct FAB fab = cc$rms_fab;
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struct NAM nam = cc$rms_nam;
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char esa[NAM$C_MAXRSS];
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fab.fab$l_fna = fn;
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fab.fab$b_fns = strlen(fn);
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fab.fab$l_nam = &nam;
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fab.fab$l_fop = FAB$M_NAM;
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nam.nam$l_esa = esa;
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nam.nam$b_ess = sizeof esa;
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return SYS$PARSE(&fab, 0, 0) == RMS$_NORMAL;
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}
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#else /* !VMS */
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#ifdef MSDOS /* MW, May 1993 */
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static int
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valid_filename_p (fn)
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char *fn;
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{
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return *fn == '\\' || *fn == '/' ||
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(*fn >= 'A' && *fn <= 'z' && fn[1] == ':');
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}
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#else
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#define valid_filename_p(fn) (*(fn) == '/')
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#endif
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#endif /* !VMS */
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/* Find the termcap entry data for terminal type NAME
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and store it in the block that BP points to.
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Record its address for future use.
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If BP is null, space is dynamically allocated.
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Return -1 if there is some difficulty accessing the data base
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of terminal types,
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0 if the data base is accessible but the type NAME is not defined
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in it, and some other value otherwise. */
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__private_extern__
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int
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tgetent (bp, name)
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char *bp, *name;
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{
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register char *termcap_name;
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register int fd;
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struct buffer buf;
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register char *bp1;
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char *bp2;
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char *term;
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int malloc_size = 0;
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register int c;
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char *tcenv; /* TERMCAP value, if it contains :tc=. */
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char *indirect = NULL; /* Terminal type in :tc= in TERMCAP value. */
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int filep;
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#ifdef INTERNAL_TERMINAL
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/* For the internal terminal we don't want to read any termcap file,
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so fake it. */
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if (!strcmp (name, "internal"))
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{
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term = INTERNAL_TERMINAL;
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if (!bp)
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{
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malloc_size = 1 + strlen (term);
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bp = (char *) xmalloc (malloc_size);
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}
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strcpy (bp, term);
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goto ret;
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}
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#endif /* INTERNAL_TERMINAL */
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/* For compatibility with programs like `less' that want to
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put data in the termcap buffer themselves as a fallback. */
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if (bp)
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term_entry = bp;
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termcap_name = getenv ("TERMCAP");
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if (termcap_name && *termcap_name == '\0')
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termcap_name = NULL;
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#if 0
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#if defined (MSDOS) && !defined (TEST)
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if (termcap_name && (*termcap_name == '\\'
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|| *termcap_name == '/'
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|| termcap_name[1] == ':'))
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dostounix_filename(termcap_name);
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#endif
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#endif
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filep = termcap_name && valid_filename_p (termcap_name);
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/* If termcap_name is non-null and starts with / (in the un*x case, that is),
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it is a file name to use instead of /etc/termcap.
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If it is non-null and does not start with /,
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it is the entry itself, but only if
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the name the caller requested matches the TERM variable. */
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if (termcap_name && !filep && !strcmp (name, getenv ("TERM")))
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{
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indirect = tgetst1 (find_capability (termcap_name, "tc"), (char **) 0);
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if (!indirect)
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{
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if (!bp)
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bp = termcap_name;
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else
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strcpy (bp, termcap_name);
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goto ret;
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}
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else
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{ /* It has tc=. Need to read /etc/termcap. */
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tcenv = termcap_name;
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termcap_name = NULL;
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}
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}
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if (!termcap_name || !filep)
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termcap_name = TERMCAP_FILE;
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/* Here we know we must search a file and termcap_name has its name. */
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#ifdef MSDOS
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fd = open (termcap_name, O_RDONLY|O_TEXT, 0);
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#else
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fd = open (termcap_name, O_RDONLY, 0);
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#endif
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if (fd < 0)
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return -1;
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buf.size = BUFSIZE;
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/* Add 1 to size to ensure room for terminating null. */
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buf.beg = (char *) xmalloc (buf.size + 1);
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term = indirect ? indirect : name;
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if (!bp)
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{
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malloc_size = indirect ? strlen (tcenv) + 1 : buf.size;
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bp = (char *) xmalloc (malloc_size);
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}
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bp1 = bp;
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if (indirect)
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/* Copy the data from the environment variable. */
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{
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strcpy (bp, tcenv);
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bp1 += strlen (tcenv);
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}
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while (term)
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{
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/* Scan the file, reading it via buf, till find start of main entry. */
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if (scan_file (term, fd, &buf) == 0)
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{
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close (fd);
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free (buf.beg);
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if (malloc_size)
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free (bp);
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return 0;
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}
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/* Free old `term' if appropriate. */
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if (term != name)
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free (term);
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/* If BP is malloc'd by us, make sure it is big enough. */
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if (malloc_size)
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{
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malloc_size = bp1 - bp + buf.size;
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termcap_name = (char *) xrealloc (bp, malloc_size);
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bp1 += termcap_name - bp;
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bp = termcap_name;
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}
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bp2 = bp1;
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/* Copy the line of the entry from buf into bp. */
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termcap_name = buf.ptr;
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while ((*bp1++ = c = *termcap_name++) && c != '\n')
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/* Drop out any \ newline sequence. */
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if (c == '\\' && *termcap_name == '\n')
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{
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bp1--;
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termcap_name++;
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}
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*bp1 = '\0';
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/* Does this entry refer to another terminal type's entry?
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If something is found, copy it into heap and null-terminate it. */
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term = tgetst1 (find_capability (bp2, "tc"), (char **) 0);
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}
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close (fd);
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free (buf.beg);
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if (malloc_size)
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bp = (char *) xrealloc (bp, bp1 - bp + 1);
|
||
|
||
ret:
|
||
term_entry = bp;
|
||
return 1;
|
||
}
|
||
|
||
/* Given file open on FD and buffer BUFP,
|
||
scan the file from the beginning until a line is found
|
||
that starts the entry for terminal type STR.
|
||
Return 1 if successful, with that line in BUFP,
|
||
or 0 if no entry is found in the file. */
|
||
|
||
static int
|
||
scan_file (str, fd, bufp)
|
||
char *str;
|
||
int fd;
|
||
register struct buffer *bufp;
|
||
{
|
||
register char *end;
|
||
|
||
bufp->ptr = bufp->beg;
|
||
bufp->full = 0;
|
||
bufp->ateof = 0;
|
||
*bufp->ptr = '\0';
|
||
|
||
lseek (fd, 0L, 0);
|
||
|
||
while (!bufp->ateof)
|
||
{
|
||
/* Read a line into the buffer. */
|
||
end = NULL;
|
||
do
|
||
{
|
||
/* if it is continued, append another line to it,
|
||
until a non-continued line ends. */
|
||
end = gobble_line (fd, bufp, end);
|
||
}
|
||
while (!bufp->ateof && end[-2] == '\\');
|
||
|
||
if (*bufp->ptr != '#'
|
||
&& name_match (bufp->ptr, str))
|
||
return 1;
|
||
|
||
/* Discard the line just processed. */
|
||
bufp->ptr = end;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* Return nonzero if NAME is one of the names specified
|
||
by termcap entry LINE. */
|
||
|
||
static int
|
||
name_match (line, name)
|
||
char *line, *name;
|
||
{
|
||
register char *tem;
|
||
|
||
if (!compare_contin (line, name))
|
||
return 1;
|
||
/* This line starts an entry. Is it the right one? */
|
||
for (tem = line; *tem && *tem != '\n' && *tem != ':'; tem++)
|
||
if (*tem == '|' && !compare_contin (tem + 1, name))
|
||
return 1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
compare_contin (str1, str2)
|
||
register char *str1, *str2;
|
||
{
|
||
register int c1, c2;
|
||
while (1)
|
||
{
|
||
c1 = *str1++;
|
||
c2 = *str2++;
|
||
while (c1 == '\\' && *str1 == '\n')
|
||
{
|
||
str1++;
|
||
while ((c1 = *str1++) == ' ' || c1 == '\t');
|
||
}
|
||
if (c2 == '\0')
|
||
{
|
||
/* End of type being looked up. */
|
||
if (c1 == '|' || c1 == ':')
|
||
/* If end of name in data base, we win. */
|
||
return 0;
|
||
else
|
||
return 1;
|
||
}
|
||
else if (c1 != c2)
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
/* Make sure that the buffer <- BUFP contains a full line
|
||
of the file open on FD, starting at the place BUFP->ptr
|
||
points to. Can read more of the file, discard stuff before
|
||
BUFP->ptr, or make the buffer bigger.
|
||
|
||
Return the pointer to after the newline ending the line,
|
||
or to the end of the file, if there is no newline to end it.
|
||
|
||
Can also merge on continuation lines. If APPEND_END is
|
||
non-null, it points past the newline of a line that is
|
||
continued; we add another line onto it and regard the whole
|
||
thing as one line. The caller decides when a line is continued. */
|
||
|
||
static char *
|
||
gobble_line (fd, bufp, append_end)
|
||
int fd;
|
||
register struct buffer *bufp;
|
||
char *append_end;
|
||
{
|
||
register char *end;
|
||
register int nread;
|
||
register char *buf = bufp->beg;
|
||
register char *tem;
|
||
|
||
if (!append_end)
|
||
append_end = bufp->ptr;
|
||
|
||
while (1)
|
||
{
|
||
end = append_end;
|
||
while (*end && *end != '\n') end++;
|
||
if (*end)
|
||
break;
|
||
if (bufp->ateof)
|
||
return buf + bufp->full;
|
||
if (bufp->ptr == buf)
|
||
{
|
||
if (bufp->full == bufp->size)
|
||
{
|
||
bufp->size *= 2;
|
||
/* Add 1 to size to ensure room for terminating null. */
|
||
tem = (char *) xrealloc (buf, bufp->size + 1);
|
||
bufp->ptr = (bufp->ptr - buf) + tem;
|
||
append_end = (append_end - buf) + tem;
|
||
bufp->beg = buf = tem;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
append_end -= bufp->ptr - buf;
|
||
bcopy (bufp->ptr, buf, bufp->full -= bufp->ptr - buf);
|
||
bufp->ptr = buf;
|
||
}
|
||
if (!(nread = read (fd, buf + bufp->full, bufp->size - bufp->full)))
|
||
bufp->ateof = 1;
|
||
bufp->full += nread;
|
||
buf[bufp->full] = '\0';
|
||
}
|
||
return end + 1;
|
||
}
|
||
|
||
#ifdef TEST
|
||
|
||
#ifdef NULL
|
||
#undef NULL
|
||
#endif
|
||
|
||
#include <stdio.h>
|
||
|
||
main (argc, argv)
|
||
int argc;
|
||
char **argv;
|
||
{
|
||
char *term;
|
||
char *buf;
|
||
|
||
term = argv[1];
|
||
printf ("TERM: %s\n", term);
|
||
|
||
buf = (char *) tgetent (0, term);
|
||
if ((int) buf <= 0)
|
||
{
|
||
printf ("No entry.\n");
|
||
return 0;
|
||
}
|
||
|
||
printf ("Entry: %s\n", buf);
|
||
|
||
tprint ("cm");
|
||
tprint ("AL");
|
||
|
||
printf ("co: %d\n", tgetnum ("co"));
|
||
printf ("am: %d\n", tgetflag ("am"));
|
||
}
|
||
|
||
tprint (cap)
|
||
char *cap;
|
||
{
|
||
char *x = tgetstr (cap, 0);
|
||
register char *y;
|
||
|
||
printf ("%s: ", cap);
|
||
if (x)
|
||
{
|
||
for (y = x; *y; y++)
|
||
if (*y <= ' ' || *y == 0177)
|
||
printf ("\\%0o", *y);
|
||
else
|
||
putchar (*y);
|
||
free (x);
|
||
}
|
||
else
|
||
printf ("none");
|
||
putchar ('\n');
|
||
}
|
||
|
||
#endif /* TEST */
|