termcap.c revision 267654 
1/* A portion of this file is from ncurses: */
2/***************************************************************************
3*                            COPYRIGHT NOTICE                              *
4****************************************************************************
5*                ncurses is copyright (C) 1992-1995                        *
6*                          Zeyd M. Ben-Halim                               *
7*                          zmbenhal@netcom.com                             *
8*                          Eric S. Raymond                                 *
9*                          esr@snark.thyrsus.com                           *
10*                                                                          *
11*        Permission is hereby granted to reproduce and distribute ncurses  *
12*        by any means and for any fee, whether alone or as part of a       *
13*        larger distribution, in source or in binary form, PROVIDED        *
14*        this notice is included with any such distribution, and is not    *
15*        removed from any of its header files. Mention of ncurses in any   *
16*        applications linked with it is highly appreciated.                *
17*                                                                          *
18*        ncurses comes AS IS with no warranty, implied or expressed.       *
19*                                                                          *
20***************************************************************************/
21
22#include <curses.priv.h>
23
24#include <string.h>
25#include <term.h>
26#include <tic.h>
27#include <term_entry.h>
28
29/* The rest is from BSD */
30/*
31 * Copyright (c) 1980, 1993
32 *	The Regents of the University of California.  All rights reserved.
33 *
34 * Redistribution and use in source and binary forms, with or without
35 * modification, are permitted provided that the following conditions
36 * are met:
37 * 1. Redistributions of source code must retain the above copyright
38 *    notice, this list of conditions and the following disclaimer.
39 * 2. Redistributions in binary form must reproduce the above copyright
40 *    notice, this list of conditions and the following disclaimer in the
41 *    documentation and/or other materials provided with the distribution.
42 * 4. Neither the name of the University nor the names of its contributors
43 *    may be used to endorse or promote products derived from this software
44 *    without specific prior written permission.
45 *
46 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56 * SUCH DAMAGE.
57 */
58
59#include <sys/cdefs.h>
60__FBSDID("$FreeBSD: releng/9.3/lib/ncurses/ncurses/termcap.c 166130 2007-01-20 07:46:45Z rafan $");
61
62#ifndef lint
63static const char sccsid[] = "@(#)termcap.c	8.1 (Berkeley) 6/4/93";
64#endif /* not lint */
65
66#include <stdio.h>
67#include <ctype.h>
68#include <stdlib.h>
69#include <string.h>
70#include <unistd.h>
71#include <sys/param.h>
72#include "pathnames.h"
73
74#define	PBUFSIZ	MAXPATHLEN	/* max length of filename path */
75#define	PVECSIZ	32		/* max number of names in path */
76#define	TBUFSIZ 1024		/* max length of _nc_tgetent buffer */
77
78char _nc_termcap[TBUFSIZ + 1]; /* Last getcap, provided to tgetent() emul */
79
80/*
81 * termcap - routines for dealing with the terminal capability data base
82 *
83 * BUG:		Should use a "last" pointer in tbuf, so that searching
84 *		for capabilities alphabetically would not be a n**2/2
85 *		process when large numbers of capabilities are given.
86 * Note:	If we add a last pointer now we will screw up the
87 *		tc capability. We really should compile termcap.
88 *
89 * Essentially all the work here is scanning and decoding escapes
90 * in string capabilities.  We don't use stdio because the editor
91 * doesn't, and because living w/o it is not hard.
92 */
93
94/*
95 * Get an entry for terminal name in buffer _nc_termcap from the termcap
96 * file.
97 */
98int
99_nc_read_termcap_entry(const char *const name, TERMTYPE *const tp)
100{
101	ENTRY	*ep;
102	char *p;
103	char *cp;
104	char  *dummy;
105	char **fname;
106	char  *home;
107	int    i;
108	char   pathbuf[PBUFSIZ];	/* holds raw path of filenames */
109	char  *pathvec[PVECSIZ];	/* to point to names in pathbuf */
110	char **pvec;			/* holds usable tail of path vector */
111	char  *termpath;
112
113	_nc_termcap[0] = '\0';		/* in case */
114	dummy = NULL;
115	fname = pathvec;
116	pvec = pathvec;
117	p = pathbuf;
118	cp = getenv("TERMCAP");
119	/*
120	 * TERMCAP can have one of two things in it. It can be the
121	 * name of a file to use instead of /etc/termcap. In this
122	 * case it better start with a "/". Or it can be an entry to
123	 * use so we don't have to read the file. In this case it
124	 * has to already have the newlines crunched out.  If TERMCAP
125	 * does not hold a file name then a path of names is searched
126	 * instead.  The path is found in the TERMPATH variable, or
127	 * becomes "$HOME/.termcap /etc/termcap" if no TERMPATH exists.
128	 */
129	if (!cp || *cp != '/') {	/* no TERMCAP or it holds an entry */
130		if ( (termpath = getenv("TERMPATH")) )
131			strncpy(pathbuf, termpath, PBUFSIZ);
132		else {
133			if ( (home = getenv("HOME")) ) {/* set up default */
134				strncpy(pathbuf, home, PBUFSIZ - 1); /* $HOME first */
135				pathbuf[PBUFSIZ - 2] = '\0'; /* -2 because we add a slash */
136				p += strlen(pathbuf);	/* path, looking in */
137				*p++ = '/';
138			}	/* if no $HOME look in current directory */
139			strncpy(p, _PATH_DEF, PBUFSIZ - (p - pathbuf));
140		}
141	}
142	else				/* user-defined name in TERMCAP */
143		strncpy(pathbuf, cp, PBUFSIZ);	/* still can be tokenized */
144
145	/* For safety */
146	if (issetugid())
147		strcpy(pathbuf, _PATH_DEF_SEC);
148
149	pathbuf[PBUFSIZ - 1] = '\0';
150
151	*fname++ = pathbuf;	/* tokenize path into vector of names */
152	while (*++p)
153		if (*p == ' ' || *p == ':') {
154			*p = '\0';
155			while (*++p)
156				if (*p != ' ' && *p != ':')
157					break;
158			if (*p == '\0')
159				break;
160			*fname++ = p;
161			if (fname >= pathvec + PVECSIZ) {
162				fname--;
163				break;
164			}
165		}
166	*fname = (char *) 0;			/* mark end of vector */
167	if (cp && *cp && *cp != '/')
168		if (cgetset(cp) < 0)
169			return(-2);
170
171	i = cgetent(&dummy, pathvec, (char *)name);
172
173	if (i == 0) {
174		char *pd, *ps, *tok, *s, *tcs;
175		size_t len;
176
177		pd = _nc_termcap;
178		ps = dummy;
179		if ((tok = strchr(ps, ':')) == NULL) {
180			len = strlen(ps);
181			if (len >= TBUFSIZ)
182				i = -1;
183			else
184				strcpy(pd, ps);
185			goto done;
186		}
187		len = tok - ps + 1;
188		if (pd + len + 1 - _nc_termcap >= TBUFSIZ) {
189			i = -1;
190			goto done;
191		}
192		memcpy(pd, ps, len);
193		ps += len;
194		pd += len;
195		*pd = '\0';
196		tcs = pd - 1;
197		for (;;) {
198			while ((tok = strsep(&ps, ":")) != NULL &&
199			       *(tok - 2) != '\\' &&
200			       (*tok == '\0' || *tok == '\\' || !isgraph(UChar(*tok))))
201				;
202			if (tok == NULL)
203				break;
204			for (s = tcs; s != NULL && s[1] != '\0';
205			     s = strchr(s, ':')) {
206				s++;
207				if (s[0] == tok[0] && s[1] == tok[1])
208					goto skip_it;
209			}
210			len = strlen(tok);
211			if (pd + len + 1 - _nc_termcap >= TBUFSIZ) {
212				i = -1;
213				break;
214			}
215			memcpy(pd, tok, len);
216			pd += len;
217			*pd++ = ':';
218			*pd = '\0';
219		skip_it: ;
220		}
221	}
222done:
223	if (dummy)
224		free(dummy);
225
226
227/*
228 * From here on is ncurses-specific glue code
229 */
230
231	if (i < 0)
232		return(TGETENT_ERR);
233
234	_nc_set_source("TERMCAP");
235	_nc_read_entry_source((FILE *)NULL, _nc_termcap, FALSE, TRUE, NULLHOOK);
236
237	if (_nc_head == (ENTRY *)NULL)
238		return(TGETENT_ERR);
239
240	/* resolve all use references */
241	_nc_resolve_uses2(TRUE, FALSE);
242
243	for_entry_list(ep)
244		if (_nc_name_match(ep->tterm.term_names, name, "|:"))
245		{
246			/*
247			 * Make a local copy of the terminal capabilities, delinked
248			 * from the list.
249			 */
250			memcpy(tp, &ep->tterm, sizeof(TERMTYPE));
251			_nc_delink_entry(_nc_head, &(ep->tterm));
252			free(ep);
253			_nc_free_entries(_nc_head);
254			_nc_head = _nc_tail = NULL;	/* do not reuse! */
255
256			return TGETENT_YES;	/* OK */
257		}
258
259	_nc_free_entries(_nc_head);
260	_nc_head = _nc_tail = NULL;	/* do not reuse! */
261	return(TGETENT_NO);	/* not found */
262}
263