377 lines
8.8 KiB
C
377 lines
8.8 KiB
C
/* $NetBSD: tty.c,v 1.26 2006/10/31 20:07:33 christos Exp $ */
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/*
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* Copyright (c) 1980, 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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* 3. 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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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)tty.c 8.2 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: tty.c,v 1.26 2006/10/31 20:07:33 christos Exp $");
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#endif
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#endif /* not lint */
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/*
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* Mail -- a mail program
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*
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* Generally useful tty stuff.
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*/
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#include "rcv.h"
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#include "extern.h"
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#ifdef USE_EDITLINE
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#include "complete.h"
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#endif
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#if !defined(USE_EDITLINE) || !defined(TIOCSTI)
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static cc_t c_erase; /* Current erase char */
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static cc_t c_kill; /* Current kill char */
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#endif
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#ifndef USE_EDITLINE
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static jmp_buf rewrite; /* Place to go when continued */
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#endif
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static jmp_buf intjmp; /* Place to go when interrupted */
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#ifndef TIOCSTI
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static int ttyset; /* We must now do erase/kill */
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#endif
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/*
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* Read all relevant header fields.
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*/
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int
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grabh(struct header *hp, int gflags)
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{
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struct termios ttybuf;
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/* The following are declared volatile to avoid longjmp
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* clobbering, though they seem safe without it! */
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sig_t volatile saveint;
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sig_t volatile savetstp;
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sig_t volatile savettou;
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sig_t volatile savettin;
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#ifndef TIOCSTI
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sig_t volatile savequit;
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#else
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# ifdef TIOCEXT
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int volatile extproc;
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# endif /* TIOCEXT */
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#endif /* TIOCSTI */
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int retval;
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savetstp = signal(SIGTSTP, SIG_DFL);
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savettou = signal(SIGTTOU, SIG_DFL);
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savettin = signal(SIGTTIN, SIG_DFL);
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#ifndef TIOCSTI
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ttyset = 0;
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#endif
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if (tcgetattr(fileno(stdin), &ttybuf) < 0) {
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warn("tcgetattr");
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return(-1);
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}
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#if !defined(USE_EDITLINE) || !defined(TIOCSTI)
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c_erase = ttybuf.c_cc[VERASE];
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c_kill = ttybuf.c_cc[VKILL];
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#endif
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#ifndef TIOCSTI
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ttybuf.c_cc[VERASE] = _POSIX_VDISABLE;
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ttybuf.c_cc[VKILL] = _POSIX_VDISABLE;
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if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL)
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(void)signal(SIGINT, SIG_DFL);
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if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL)
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(void)signal(SIGQUIT, SIG_DFL);
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#else
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# ifdef TIOCEXT
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extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0);
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if (extproc) {
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int flag;
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flag = 0;
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if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0)
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warn("TIOCEXT: off");
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}
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# endif /* TIOCEXT */
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saveint = signal(SIGINT, ttyint); /* must precede setjmp to be saved */
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if ((retval = setjmp(intjmp)) != 0) {
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(void)fputc('\n', stdout);
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goto out;
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}
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#endif
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if (gflags & GTO) {
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#ifndef TIOCSTI
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if (!ttyset && hp->h_to != NULL)
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ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
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#endif
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hp->h_to =
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extract(readtty("To: ", detract(hp->h_to, 0)), GTO);
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}
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if (gflags & GSUBJECT) {
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#ifndef TIOCSTI
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if (!ttyset && hp->h_subject != NULL)
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ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
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#endif
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hp->h_subject = readtty("Subject: ", hp->h_subject);
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}
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if (gflags & GCC) {
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#ifndef TIOCSTI
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if (!ttyset && hp->h_cc != NULL)
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ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
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#endif
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hp->h_cc =
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extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC);
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}
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if (gflags & GBCC) {
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#ifndef TIOCSTI
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if (!ttyset && hp->h_bcc != NULL)
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ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
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#endif
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hp->h_bcc =
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extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC);
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}
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if (gflags & GSMOPTS) {
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char *smopts;
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#ifndef TIOCSTI
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if (!ttyset && hp->h_smopts != NULL)
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ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
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#endif
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smopts = readtty("Smopts: ", detract(hp->h_smopts, GSMOPTS));
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/* Parse smopts with getrawlist() rather than expand()
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* to get a shell-like expansion.
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*/
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hp->h_smopts = NULL;
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if (smopts) {
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struct name *np, *t;
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char *argv[MAXARGC];
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int argc, i;
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np = NULL;
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argc = getrawlist(smopts, argv, sizeof(argv)/sizeof(*argv));
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for (i = 0; i < argc; i++) {
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t = nalloc(argv[i], GSMOPTS);
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if (hp->h_smopts == NULL)
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hp->h_smopts = t;
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else
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np->n_flink = t;
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t->n_blink = np;
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np = t;
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}
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}
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#ifdef MIME_SUPPORT
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if (hp->h_attach) {
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struct attachment *ap;
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int i;
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i = 0;
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for (ap = hp->h_attach; ap; ap = ap->a_flink)
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i++;
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(void)printf("Attachment%s: %d\n", i > 1 ? "s" : "", i);
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}
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#endif
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}
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#ifdef TIOCSTI
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out:
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#endif
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(void)signal(SIGTSTP, savetstp);
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(void)signal(SIGTTOU, savettou);
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(void)signal(SIGTTIN, savettin);
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#ifndef TIOCSTI
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ttybuf.c_cc[VERASE] = c_erase;
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ttybuf.c_cc[VKILL] = c_kill;
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if (ttyset)
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tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
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(void)signal(SIGQUIT, savequit);
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#else
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# ifdef TIOCEXT
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if (extproc) {
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int flag;
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flag = 1;
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if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0)
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warn("TIOCEXT: on");
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}
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# endif /* TIOCEXT */
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#endif
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(void)signal(SIGINT, saveint);
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return retval;
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}
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/*
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* Read up a header from standard input.
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* The source string has the preliminary contents to
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* be read.
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*
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*/
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#ifdef USE_EDITLINE
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char *
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readtty(const char pr[], char src[])
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{
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char *line;
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line = my_gets(&elm.string, pr, src);
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#if 0
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return line ? savestr(line) : __UNCONST("");
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#else
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if (line)
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return savestr(line);
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else
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return __UNCONST("");
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#endif
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}
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#else /* USE_EDITLINE */
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char *
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readtty(const char pr[], char src[])
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{
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/* XXX - watch for potential setjmp/longjmp clobbering!
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* Currently there appear to be none.
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*/
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char canonb[BUFSIZ];
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int c;
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char *cp, *cp2;
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#ifdef TIOCSTI
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char ch;
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static char empty[] = "";
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#endif
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(void)fputs(pr, stdout);
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(void)fflush(stdout);
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if (src != NULL && strlen(src) > BUFSIZ - 2) {
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(void)printf("too long to edit\n");
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return(src);
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}
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#ifndef TIOCSTI
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if (src != NULL)
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cp = copy(src, canonb);
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else
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cp = copy("", canonb);
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(void)fputs(canonb, stdout);
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(void)fflush(stdout);
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#else
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cp = src == NULL ? empty : src;
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while ((c = *cp++) != '\0') {
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if ((c_erase != _POSIX_VDISABLE && c == c_erase) ||
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(c_kill != _POSIX_VDISABLE && c == c_kill)) {
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ch = '\\';
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(void)ioctl(0, TIOCSTI, &ch);
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}
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ch = c;
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(void)ioctl(0, TIOCSTI, &ch);
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}
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cp = canonb;
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*cp = 0;
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#endif
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cp2 = cp;
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while (cp2 < canonb + BUFSIZ)
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*cp2++ = 0;
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cp2 = cp;
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if (setjmp(rewrite))
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goto redo;
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(void)signal(SIGTSTP, ttystop);
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(void)signal(SIGTTOU, ttystop);
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(void)signal(SIGTTIN, ttystop);
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clearerr(stdin);
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while (cp2 < canonb + BUFSIZ) {
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c = getc(stdin);
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if (c == EOF || c == '\n')
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break;
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*cp2++ = c;
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}
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*cp2 = 0;
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(void)signal(SIGTSTP, SIG_DFL);
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(void)signal(SIGTTOU, SIG_DFL);
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(void)signal(SIGTTIN, SIG_DFL);
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if (c == EOF && ferror(stdin)) {
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redo:
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cp = strlen(canonb) > 0 ? canonb : NULL;
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clearerr(stdin);
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return(readtty(pr, cp));
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}
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#ifndef TIOCSTI
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if (cp == NULL || *cp == '\0')
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return(src);
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cp2 = cp;
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if (!ttyset)
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return(strlen(canonb) > 0 ? savestr(canonb) : NULL);
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while (*cp != '\0') {
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c = *cp++;
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if (c_erase != _POSIX_VDISABLE && c == c_erase) {
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if (cp2 == canonb)
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continue;
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if (cp2[-1] == '\\') {
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cp2[-1] = c;
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continue;
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}
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cp2--;
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continue;
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}
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if (c_kill != _POSIX_VDISABLE && c == c_kill) {
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if (cp2 == canonb)
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continue;
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if (cp2[-1] == '\\') {
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cp2[-1] = c;
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continue;
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}
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cp2 = canonb;
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continue;
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}
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*cp2++ = c;
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}
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*cp2 = '\0';
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#endif
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if (equal("", canonb))
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return(NULL);
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return(savestr(canonb));
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}
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/*
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* Receipt continuation.
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*/
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void
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ttystop(int s)
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{
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sig_t old_action = signal(s, SIG_DFL);
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sigset_t nset;
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(void)sigemptyset(&nset);
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(void)sigaddset(&nset, s);
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(void)sigprocmask(SIG_BLOCK, &nset, NULL);
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(void)kill(0, s);
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(void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
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(void)signal(s, old_action);
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longjmp(rewrite, 1);
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}
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#endif /* USE_EDITLINE */
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/*ARGSUSED*/
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void
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ttyint(int s __unused)
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{
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longjmp(intjmp, 1);
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}
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