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/* $OpenBSD: tty.c,v 1.20 2014/01/17 18:42:30 okan Exp $ */ |
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/* $NetBSD: tty.c,v 1.7 1997/07/09 05:25:46 mikel 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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/* |
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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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#include <sys/ioctl.h> |
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#include <errno.h> |
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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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#ifndef TIOCSTI |
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static int ttyset; /* We must now do erase/kill */ |
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#endif |
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static volatile sig_atomic_t ttysignal; /* Interrupted by a signal? */ |
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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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#ifndef TIOCSTI |
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struct sigaction savequit; |
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#else |
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# ifdef TIOCEXT |
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int extproc; |
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int flag; |
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# endif /* TIOCEXT */ |
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#endif |
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struct sigaction savetstp; |
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struct sigaction savettou; |
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struct sigaction savettin; |
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struct sigaction act; |
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char *s; |
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int error; |
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sigemptyset(&act.sa_mask); |
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act.sa_flags = SA_RESTART; |
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act.sa_handler = SIG_DFL; |
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(void)sigaction(SIGTSTP, &act, &savetstp); |
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(void)sigaction(SIGTTOU, &act, &savettou); |
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(void)sigaction(SIGTTIN, &act, &savettin); |
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error = 1; |
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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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c_erase = ttybuf.c_cc[VERASE]; |
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c_kill = ttybuf.c_cc[VKILL]; |
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#ifndef TIOCSTI |
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ttybuf.c_cc[VERASE] = 0; |
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ttybuf.c_cc[VKILL] = 0; |
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act.sa_handler = SIG_IGN; |
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if (sigaction(SIGQUIT, &act, &savequit) == 0 && |
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savequit.sa_handler == SIG_DFL) |
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(void)sigaction(SIGQUIT, &savequit, NULL); |
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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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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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#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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s = readtty("To: ", detract(hp->h_to, 0)); |
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if (s == NULL) |
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goto out; |
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hp->h_to = extract(s, 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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s = readtty("Subject: ", hp->h_subject); |
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if (s == NULL) |
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goto out; |
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hp->h_subject = s; |
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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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s = readtty("Cc: ", detract(hp->h_cc, 0)); |
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if (s == NULL) |
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goto out; |
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hp->h_cc = extract(s, 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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s = readtty("Bcc: ", detract(hp->h_bcc, 0)); |
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if (s == NULL) |
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goto out; |
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hp->h_bcc = extract(s, GBCC); |
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} |
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error = 0; |
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out: |
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(void)sigaction(SIGTSTP, &savetstp, NULL); |
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(void)sigaction(SIGTTOU, &savettou, NULL); |
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(void)sigaction(SIGTTIN, &savettin, NULL); |
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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)sigaction(SIGQUIT, &savequit, NULL); |
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#else |
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# ifdef TIOCEXT |
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if (extproc) { |
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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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return(error); |
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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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char * |
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readtty(char *pr, char *src) |
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{ |
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struct sigaction act, saveint; |
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char ch, canonb[BUFSIZ]; |
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char *cp, *cp2; |
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sigset_t oset; |
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int c; |
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fputs(pr, stdout); |
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fflush(stdout); |
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if (src != NULL && strlen(src) > sizeof(canonb) - 2) { |
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puts("too long to edit"); |
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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); /* safe, bounds checked above */ |
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else |
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cp = copy("", canonb); |
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fputs(canonb, stdout); |
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fflush(stdout); |
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#else |
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cp = src == NULL ? "" : src; |
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while ((c = (unsigned char)*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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ioctl(0, TIOCSTI, &ch); |
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} |
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ch = c; |
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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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sigemptyset(&act.sa_mask); |
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act.sa_flags = 0; /* Note: will not restart syscalls */ |
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act.sa_handler = ttyint; |
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(void)sigaction(SIGINT, &act, &saveint); |
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act.sa_handler = ttystop; |
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(void)sigaction(SIGTSTP, &act, NULL); |
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(void)sigaction(SIGTTOU, &act, NULL); |
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(void)sigaction(SIGTTIN, &act, NULL); |
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(void)sigprocmask(SIG_UNBLOCK, &intset, &oset); |
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clearerr(stdin); |
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memset(cp, 0, canonb + sizeof(canonb) - cp); |
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for (cp2 = cp; cp2 < canonb + sizeof(canonb) - 1; ) { |
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c = getc(stdin); |
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switch (ttysignal) { |
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case SIGINT: |
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ttysignal = 0; |
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cp2 = NULL; |
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c = EOF; |
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/* FALLTHROUGH */ |
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case 0: |
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break; |
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default: |
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ttysignal = 0; |
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goto redo; |
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} |
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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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act.sa_handler = SIG_DFL; |
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sigemptyset(&act.sa_mask); |
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act.sa_flags = SA_RESTART; |
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(void)sigprocmask(SIG_SETMASK, &oset, NULL); |
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(void)sigaction(SIGTSTP, &act, NULL); |
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(void)sigaction(SIGTTOU, &act, NULL); |
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(void)sigaction(SIGTTIN, &act, NULL); |
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(void)sigaction(SIGINT, &saveint, NULL); |
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if (cp2 == NULL) |
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return(NULL); /* user hit ^C */ |
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*cp2 = '\0'; |
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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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/* XXX - make iterative, not recursive */ |
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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 = (unsigned char)*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(""); |
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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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struct sigaction act, oact; |
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sigset_t nset; |
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int save_errno; |
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/* |
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* Save old handler and set to default. |
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* Unblock receipt of 's' and then resend it. |
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*/ |
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save_errno = errno; |
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(void)sigemptyset(&act.sa_mask); |
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act.sa_flags = SA_RESTART; |
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act.sa_handler = SIG_DFL; |
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(void)sigaction(s, &act, &oact); |
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(void)sigemptyset(&nset); |
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(void)sigaddset(&nset, s); |
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(void)sigprocmask(SIG_UNBLOCK, &nset, NULL); |
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(void)kill(0, s); |
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(void)sigprocmask(SIG_BLOCK, &nset, NULL); |
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(void)sigaction(s, &oact, NULL); |
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ttysignal = s; |
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errno = save_errno; |
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} |
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/*ARGSUSED*/ |
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void |
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ttyint(int s) |
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{ |
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ttysignal = s; |
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} |