8a16b7a18f
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
292 lines
6.9 KiB
C
292 lines
6.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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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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#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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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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static cc_t c_erase; /* Current erase char */
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static cc_t c_kill; /* Current kill char */
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static jmp_buf rewrite; /* Place to go when continued */
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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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sig_t saveint;
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sig_t savetstp;
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sig_t savettou;
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sig_t savettin;
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int errs;
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#ifndef TIOCSTI
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sig_t savequit;
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#else
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# ifdef TIOCEXT
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int extproc, flag;
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# endif /* TIOCEXT */
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#endif /* TIOCSTI */
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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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errs = 0;
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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(stdin)");
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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] = _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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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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if (setjmp(intjmp))
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goto out;
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saveint = signal(SIGINT, ttyint);
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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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out:
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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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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 (errs);
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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(const char *pr, char src[])
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{
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char ch, canonb[BUFSIZ];
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int c;
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char *cp, *cp2;
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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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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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strlcpy(canonb, src, sizeof(canonb));
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else
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*canonb = '\0';
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fputs(canonb, stdout);
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(void)fflush(stdout);
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#else
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cp = src == NULL ? "" : 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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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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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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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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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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