1 files changed, 306 insertions, 0 deletions
diff --git a/mail_cmds/mail/tty.c b/mail_cmds/mail/tty.c
new file mode 100644
index 0000000..77e9e0d
--- /dev/null
+++ b/mail_cmds/mail/tty.c
@@ -0,0 +1,306 @@
+/*
+ * Copyright (c) 1980, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)tty.c	8.2 (Berkeley) 6/6/93";
+#endif
+static const char rcsid[] =
+  "$FreeBSD: src/usr.bin/mail/tty.c,v 1.6 2002/06/30 05:25:06 obrien Exp $";
+#endif /* not lint */
+
+#include <sys/cdefs.h>
+#include <sys/ioctl.h>
+
+/*
+ * Mail -- a mail program
+ *
+ * Generally useful tty stuff.
+ */
+
+#include "rcv.h"
+#include "extern.h"
+
+static	cc_t	c_erase;		/* Current erase char */
+static	cc_t	c_kill;			/* Current kill char */
+static	jmp_buf	rewrite;		/* Place to go when continued */
+static	jmp_buf	intjmp;			/* Place to go when interrupted */
+#ifndef TIOCSTI
+static	int	ttyset;			/* We must now do erase/kill */
+#endif
+
+/*
+ * Read all relevant header fields.
+ */
+
+int
+grabh(hp, gflags)
+	struct header *hp;
+	int gflags;
+{
+	struct termios ttybuf;
+	sig_t saveint;
+	sig_t savetstp;
+	sig_t savettou;
+	sig_t savettin;
+	int errs;
+#ifndef TIOCSTI
+	sig_t savequit;
+#else
+# ifdef TIOCEXT
+	int extproc, flag;
+# endif /* TIOCEXT */
+#endif /* TIOCSTI */
+
+	savetstp = signal(SIGTSTP, SIG_DFL);
+	savettou = signal(SIGTTOU, SIG_DFL);
+	savettin = signal(SIGTTIN, SIG_DFL);
+	errs = 0;
+#ifndef TIOCSTI
+	ttyset = 0;
+#endif
+	if (tcgetattr(fileno(stdin), &ttybuf) < 0) {
+		warn("tcgetattr(stdin)");
+		return (-1);
+	}
+	c_erase = ttybuf.c_cc[VERASE];
+	c_kill = ttybuf.c_cc[VKILL];
+#ifndef TIOCSTI
+	ttybuf.c_cc[VERASE] = _POSIX_VDISABLE;
+	ttybuf.c_cc[VKILL] = _POSIX_VDISABLE;
+	if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL)
+		(void)signal(SIGINT, SIG_DFL);
+	if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL)
+		(void)signal(SIGQUIT, SIG_DFL);
+#else
+# ifdef		TIOCEXT
+	extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0);
+	if (extproc) {
+		flag = 0;
+		if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0)
+			warn("TIOCEXT: off");
+	}
+# endif	/* TIOCEXT */
+	saveint = signal(SIGINT, ttyint);
+	if (setjmp(intjmp)) {
+		/* Interrupt from headers needs to be told to caller */
+		errs++;
+		goto out;
+	}
+#endif
+	if (gflags & GTO) {
+#ifndef TIOCSTI
+		if (!ttyset && hp->h_to != NULL)
+			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
+#endif
+		hp->h_to =
+			extract(readtty("To: ", detract(hp->h_to, 0)), GTO);
+	}
+	if (gflags & GSUBJECT) {
+#ifndef TIOCSTI
+		if (!ttyset && hp->h_subject != NULL)
+			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
+#endif
+		hp->h_subject = readtty("Subject: ", hp->h_subject);
+	}
+	if (gflags & GCC) {
+#ifndef TIOCSTI
+		if (!ttyset && hp->h_cc != NULL)
+			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
+#endif
+		hp->h_cc =
+			extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC);
+	}
+	if (gflags & GBCC) {
+#ifndef TIOCSTI
+		if (!ttyset && hp->h_bcc != NULL)
+			ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
+#endif
+		hp->h_bcc =
+			extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC);
+	}
+out:
+	(void)signal(SIGTSTP, savetstp);
+	(void)signal(SIGTTOU, savettou);
+	(void)signal(SIGTTIN, savettin);
+#ifndef TIOCSTI
+	ttybuf.c_cc[VERASE] = c_erase;
+	ttybuf.c_cc[VKILL] = c_kill;
+	if (ttyset)
+		tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf);
+	(void)signal(SIGQUIT, savequit);
+#else
+# ifdef		TIOCEXT
+	if (extproc) {
+		flag = 1;
+		if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0)
+			warn("TIOCEXT: on");
+	}
+# endif	/* TIOCEXT */
+#endif
+	(void)signal(SIGINT, saveint);
+	return (errs);
+}
+
+/*
+ * Read up a header from standard input.
+ * The source string has the preliminary contents to
+ * be read.
+ *
+ */
+
+char *
+readtty(pr, src)
+	const char *pr;
+	char src[];
+{
+	char ch, canonb[BUFSIZ];
+	int c;
+	char *cp, *cp2;
+
+	fputs(pr, stdout);
+	(void)fflush(stdout);
+	if (src != NULL && strlen(src) > BUFSIZ - 2) {
+		printf("too long to edit\n");
+		return (src);
+	}
+#ifndef TIOCSTI
+	if (src != NULL)
+		strlcpy(canonb, src, sizeof(canonb));
+	else
+		*canonb = '\0';
+	fputs(canonb, stdout);
+	(void)fflush(stdout);
+#else
+	cp = src == NULL ? "" : src;
+	while ((c = *cp++) != '\0') {
+		if ((c_erase != _POSIX_VDISABLE && c == c_erase) ||
+		    (c_kill != _POSIX_VDISABLE && c == c_kill)) {
+			ch = '\\';
+			ioctl(0, TIOCSTI, &ch);
+		}
+		ch = c;
+		ioctl(0, TIOCSTI, &ch);
+	}
+	cp = canonb;
+	*cp = '\0';
+#endif
+	cp2 = cp;
+	while (cp2 < canonb + BUFSIZ)
+		*cp2++ = '\0';
+	cp2 = cp;
+	if (setjmp(rewrite))
+		goto redo;
+	(void)signal(SIGTSTP, ttystop);
+	(void)signal(SIGTTOU, ttystop);
+	(void)signal(SIGTTIN, ttystop);
+	clearerr(stdin);
+	while (cp2 < canonb + BUFSIZ) {
+		c = getc(stdin);
+		if (c == EOF || c == '\n')
+			break;
+		*cp2++ = c;
+	}
+	*cp2 = '\0';
+	(void)signal(SIGTSTP, SIG_DFL);
+	(void)signal(SIGTTOU, SIG_DFL);
+	(void)signal(SIGTTIN, SIG_DFL);
+	if (c == EOF && ferror(stdin)) {
+redo:
+		cp = strlen(canonb) > 0 ? canonb : NULL;
+		clearerr(stdin);
+		return (readtty(pr, cp));
+	}
+#ifndef TIOCSTI
+	if (cp == NULL || *cp == '\0')
+		return (src);
+	cp2 = cp;
+	if (!ttyset)
+		return (strlen(canonb) > 0 ? savestr(canonb) : NULL);
+	while (*cp != '\0') {
+		c = *cp++;
+		if (c_erase != _POSIX_VDISABLE && c == c_erase) {
+			if (cp2 == canonb)
+				continue;
+			if (cp2[-1] == '\\') {
+				cp2[-1] = c;
+				continue;
+			}
+			cp2--;
+			continue;
+		}
+		if (c_kill != _POSIX_VDISABLE && c == c_kill) {
+			if (cp2 == canonb)
+				continue;
+			if (cp2[-1] == '\\') {
+				cp2[-1] = c;
+				continue;
+			}
+			cp2 = canonb;
+			continue;
+		}
+		*cp2++ = c;
+	}
+	*cp2 = '\0';
+#endif
+	if (equal("", canonb))
+		return (NULL);
+	return (savestr(canonb));
+}
+
+/*
+ * Receipt continuation.
+ */
+void
+ttystop(s)
+	int s;
+{
+	sig_t old_action = signal(s, SIG_DFL);
+	sigset_t nset;
+
+	(void)sigemptyset(&nset);
+	(void)sigaddset(&nset, s);
+	(void)sigprocmask(SIG_BLOCK, &nset, NULL);
+	kill(0, s);
+	(void)sigprocmask(SIG_UNBLOCK, &nset, NULL);
+	(void)signal(s, old_action);
+	longjmp(rewrite, 1);
+}
+
+/*ARGSUSED*/
+void
+ttyint(s)
+	int s;
+{
+	longjmp(intjmp, 1);
+}