setupterm.c revision 1.7 
1/* $NetBSD: setupterm.c,v 1.7 2017/03/23 00:55:39 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 1.7 2017/03/23 00:55:39 roy Exp $");
32
33#include <sys/ioctl.h>
34#include <assert.h>
35#include <err.h>
36#include <stdbool.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <strings.h>
40#include <unistd.h>
41#include <term_private.h>
42#include <term.h>
43
44/*
45 * use_env is really a curses function - POSIX mandates it's in curses.h
46 * But it has to live in terminfo because it must precede a call to setupterm().
47 */
48#include <curses.h>
49
50static bool __use_env = true;
51
52void
53use_env(bool value)
54{
55
56	__use_env = value;
57}
58#define reterr(code, msg)						      \
59	do {								      \
60		if (errret == NULL)					      \
61			errx(EXIT_FAILURE, msg);			      \
62		else {							      \
63			*errret = code;					      \
64			return ERR;					      \
65		}							      \
66	} while (0 /* CONSTCOND */)
67
68#define reterrarg(code, msg, arg) \
69	do {								      \
70		if (errret == NULL)					      \
71			errx(EXIT_FAILURE, msg, arg);			      \
72		else {							      \
73			*errret = code;					      \
74			return ERR;					      \
75		}							      \
76	} while (0 /* CONSTCOND */)
77
78
79int
80ti_setupterm(TERMINAL **nterm, const char *term, int fildes, int *errret)
81{
82	int error;
83	struct winsize win;
84
85	_DIAGASSERT(nterm != NULL);
86
87	if (term == NULL)
88		term = getenv("TERM");
89	if (term == NULL || *term == '\0') {
90		*nterm = NULL;
91		reterr(0, "TERM environment variable not set");
92	}
93	if (fildes == STDOUT_FILENO && !isatty(fildes))
94		fildes = STDERR_FILENO;
95
96	*nterm = calloc(1, sizeof(**nterm));
97	if (*nterm == NULL)
98		reterr(-1, "not enough memory to create terminal structure");
99
100	error = _ti_getterm(*nterm, term, 0);
101	if (error != 1) {
102		del_curterm(*nterm);
103		*nterm = NULL;
104		switch (error) {
105		case -1:
106			reterr(error, "cannot access the terminfo database");
107			/* NOTREACHED */
108		case 0:
109			reterrarg(error,
110			    "%s: terminal not listed in terminfo datase",
111			    term);
112			/* NOTREACHED */
113		default:
114			reterr(-1, "unknown error");
115			/* NOTREACHED */
116		}
117	}
118
119	(*nterm)->fildes = fildes;
120	_ti_setospeed(*nterm);
121	if (t_generic_type(*nterm))
122		reterrarg(0, "%s: generic terminal", term);
123	if (t_hard_copy(*nterm))
124		reterrarg(1, "%s: hardcopy terminal", term);
125
126	/* If TIOCGWINSZ works, then set initial lines and columns. */
127	if (ioctl(fildes, TIOCGWINSZ, &win) != -1 &&
128	    win.ws_row != 0 && win.ws_col != 0)
129	{
130		t_lines(*nterm) = win.ws_row;
131		t_columns(*nterm) = win.ws_col;
132	}
133
134	/* POSIX 1003.2 requires that the environment override. */
135	if (__use_env) {
136		char *p;
137
138		if ((p = getenv("LINES")) != NULL)
139			t_lines(*nterm) = (int)strtol(p, NULL, 0);
140		if ((p = getenv("COLUMNS")) != NULL)
141			t_columns(*nterm) = (int)strtol(p, NULL, 0);
142	}
143
144	/* POSIX requires 1 for success */
145	if (errret)
146		*errret = 1;
147	return OK;
148}
149
150int
151setupterm(const char *term, int fildes, int *errret)
152{
153	TERMINAL *nterm;
154	int ret;
155
156	if (errret != NULL)
157		*errret = ERR;
158	ret = ti_setupterm(&nterm, term, fildes, errret);
159	if (nterm != NULL)
160		set_curterm(nterm);
161	return ret;
162}
163