setupterm.c revision 1.6 
1/* $NetBSD: setupterm.c,v 1.6 2017/03/23 00:36:37 roy Exp $ */
2
3/*
4 * Copyright (c) 2009, 2011 The NetBSD Foundation, Inc.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Roy Marples.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__RCSID("$NetBSD: setupterm.c,v 1.6 2017/03/23 00:36:37 roy Exp $");
32
33#include <assert.h>
34#include <err.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <strings.h>
38#include <unistd.h>
39#include <term_private.h>
40#include <term.h>
41
42#define reterr(code, msg)						      \
43	do {								      \
44		if (errret == NULL)					      \
45			errx(EXIT_FAILURE, msg);			      \
46		else {							      \
47			*errret = code;					      \
48			return ERR;					      \
49		}							      \
50	} while (0 /* CONSTCOND */)
51
52#define reterrarg(code, msg, arg) \
53	do {								      \
54		if (errret == NULL)					      \
55			errx(EXIT_FAILURE, msg, arg);			      \
56		else {							      \
57			*errret = code;					      \
58			return ERR;					      \
59		}							      \
60	} while (0 /* CONSTCOND */)
61
62
63int
64ti_setupterm(TERMINAL **nterm, const char *term, int fildes, int *errret)
65{
66	int error;
67
68	_DIAGASSERT(nterm != NULL);
69
70	if (term == NULL)
71		term = getenv("TERM");
72	if (term == NULL || *term == '\0') {
73		*nterm = NULL;
74		reterr(0, "TERM environment variable not set");
75	}
76	if (fildes == STDOUT_FILENO && !isatty(fildes))
77		fildes = STDERR_FILENO;
78
79	*nterm = calloc(1, sizeof(**nterm));
80	if (*nterm == NULL)
81		reterr(-1, "not enough memory to create terminal structure");
82
83	error = _ti_getterm(*nterm, term, 0);
84	if (error != 1) {
85		del_curterm(*nterm);
86		*nterm = NULL;
87		switch (error) {
88		case -1:
89			reterr(error, "cannot access the terminfo database");
90			/* NOTREACHED */
91		case 0:
92			reterrarg(error,
93			    "%s: terminal not listed in terminfo datase",
94			    term);
95			/* NOTREACHED */
96		default:
97			reterr(-1, "unknown error");
98			/* NOTREACHED */
99		}
100	}
101
102	(*nterm)->fildes = fildes;
103	_ti_setospeed(*nterm);
104	if (t_generic_type(*nterm))
105		reterrarg(0, "%s: generic terminal", term);
106	if (t_hard_copy(*nterm))
107		reterrarg(1, "%s: hardcopy terminal", term);
108	/* POSIX requires 1 for success */
109	if (errret)
110		*errret = 1;
111	return OK;
112}
113
114int
115setupterm(const char *term, int fildes, int *errret)
116{
117	TERMINAL *nterm;
118	int ret;
119
120	if (errret != NULL)
121		*errret = ERR;
122	ret = ti_setupterm(&nterm, term, fildes, errret);
123	if (nterm != NULL)
124		set_curterm(nterm);
125	return ret;
126}
127