b3608ae18f
The index() and rindex() functions were marked LEGACY in the 2001 revision of POSIX and were subsequently removed from the 2008 revision. The strchr() and strrchr() functions are part of the C standard. This makes the source code a lot more consistent, as most of these C files also call into other str*() routines. In fact, about a dozen already perform strchr() calls.
157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char sccsid[] = "@(#)term.c 8.1 (Berkeley) 6/9/93";
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#endif
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termcap.h>
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#include <unistd.h>
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#include <ttyent.h>
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#include "extern.h"
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char tbuf[1024]; /* Termcap entry. */
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const char *askuser(const char *);
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char *ttys(char *);
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/*
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* Figure out what kind of terminal we're dealing with, and then read in
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* its termcap entry.
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*/
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const char *
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get_termcap_entry(char *userarg, char **tcapbufp)
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{
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struct ttyent *t;
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int rval;
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char *p, *ttypath;
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const char *ttype;
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if (userarg) {
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ttype = userarg;
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goto found;
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}
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/* Try the environment. */
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if ((ttype = getenv("TERM")))
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goto map;
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/* Try ttyname(3); check for dialup or other mapping. */
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if ((ttypath = ttyname(STDERR_FILENO))) {
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if ((p = strrchr(ttypath, '/')))
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++p;
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else
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p = ttypath;
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if ((t = getttynam(p))) {
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ttype = t->ty_type;
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goto map;
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}
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}
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/* If still undefined, use "unknown". */
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ttype = "unknown";
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map: ttype = mapped(ttype);
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/*
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* If not a path, remove TERMCAP from the environment so we get a
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* real entry from /etc/termcap. This prevents us from being fooled
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* by out of date stuff in the environment.
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*/
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found: if ((p = getenv("TERMCAP")) != NULL && *p != '/')
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unsetenv("TERMCAP");
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/*
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* ttype now contains a pointer to the type of the terminal.
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* If the first character is '?', ask the user.
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*/
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if (ttype[0] == '?') {
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if (ttype[1] != '\0')
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ttype = askuser(ttype + 1);
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else
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ttype = askuser(NULL);
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}
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/* Find the termcap entry. If it doesn't exist, ask the user. */
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while ((rval = tgetent(tbuf, ttype)) == 0) {
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warnx("terminal type %s is unknown", ttype);
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ttype = askuser(NULL);
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}
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if (rval == -1)
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errx(1, "termcap: %s", strerror(errno ? errno : ENOENT));
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*tcapbufp = tbuf;
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return (ttype);
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}
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/* Prompt the user for a terminal type. */
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const char *
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askuser(const char *dflt)
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{
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static char answer[256];
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char *p;
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/* We can get recalled; if so, don't continue uselessly. */
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if (feof(stdin) || ferror(stdin)) {
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(void)fprintf(stderr, "\n");
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exit(1);
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}
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for (;;) {
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if (dflt)
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(void)fprintf(stderr, "Terminal type? [%s] ", dflt);
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else
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(void)fprintf(stderr, "Terminal type? ");
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(void)fflush(stderr);
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if (fgets(answer, sizeof(answer), stdin) == NULL) {
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if (dflt == NULL) {
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(void)fprintf(stderr, "\n");
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exit(1);
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}
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return (dflt);
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}
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if ((p = strchr(answer, '\n')))
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*p = '\0';
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if (answer[0])
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return (answer);
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if (dflt != NULL)
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return (dflt);
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}
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}
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