Importing usr.bin/write
Replaces commands/write. No Minix-specific changes needed. The NetBSD version lacks a few features that were present in the Minix version: cbreak mode, verbose, and shell escapes, but the main write(1) functionality is there and working. Change-Id: I87b9589c54d3595d26247d221bb3d1f613feeb8c
This commit is contained in:
parent
b36343fc42
commit
00709a7737
12 changed files with 590 additions and 321 deletions
|
@ -29,7 +29,7 @@ SUBDIR= add_route arp ash at backup btrace \
|
||||||
telnetd term termcap tget time touch \
|
telnetd term termcap tget time touch \
|
||||||
truncate tty udpstat umount uname \
|
truncate tty udpstat umount uname \
|
||||||
unstack update uud uue version vol \
|
unstack update uud uue version vol \
|
||||||
whereis which write writeisofs fetch \
|
whereis which writeisofs fetch \
|
||||||
zdump zmodem pkgin_cd pkgin_all \
|
zdump zmodem pkgin_cd pkgin_all \
|
||||||
worldstone updateboot update_bootcfg \
|
worldstone updateboot update_bootcfg \
|
||||||
atnormalize dosread fdisk loadfont \
|
atnormalize dosread fdisk loadfont \
|
||||||
|
|
|
@ -1,6 +0,0 @@
|
||||||
PROG= write
|
|
||||||
BINGRP= tty
|
|
||||||
BINMODE= 2755
|
|
||||||
MAN=
|
|
||||||
|
|
||||||
.include <bsd.prog.mk>
|
|
|
@ -1,271 +0,0 @@
|
||||||
/* write - write to a logged in user Authors: N. Andrew and F. van Kempen */
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Usage: write [-c] [-v] user [tty]
|
|
||||||
* -c Read & write one character at a time (cbreak mode)
|
|
||||||
* -v Verbose
|
|
||||||
*
|
|
||||||
* Version: 1.6 10/24/92
|
|
||||||
*
|
|
||||||
* NOTES: Write requires 1.4a (or higher) libraries,
|
|
||||||
* for getopt(), strchr().
|
|
||||||
*
|
|
||||||
* Authors: Nick Andrew (nick@nswitgould.oz) - Public Domain
|
|
||||||
* Fred van Kempen (minixug!waltje@kyber.uucp)
|
|
||||||
*/
|
|
||||||
|
|
||||||
#include <sys/types.h>
|
|
||||||
#include <fcntl.h>
|
|
||||||
#include <pwd.h>
|
|
||||||
#include <termios.h>
|
|
||||||
#include <signal.h>
|
|
||||||
#include <stdlib.h>
|
|
||||||
#include <string.h>
|
|
||||||
#include <unistd.h>
|
|
||||||
#include <utmp.h>
|
|
||||||
#include <time.h>
|
|
||||||
#include <stdio.h>
|
|
||||||
#include <paths.h>
|
|
||||||
|
|
||||||
#if 0
|
|
||||||
static char *Version = "@(#) WRITE 1.6 (10/24/92)";
|
|
||||||
#endif
|
|
||||||
|
|
||||||
int otty; /* file desc of callee's terminal */
|
|
||||||
short int cbreak = 0; /* are we in CBREAK (-c) mode? */
|
|
||||||
short int verbose = 0; /* are we in VERBOSE (-v) mode? */
|
|
||||||
short int writing = 0; /* is there a connection? */
|
|
||||||
char *user = NULL; /* callee's user name */
|
|
||||||
char *tty = NULL; /* callee's terminal if given */
|
|
||||||
char *ourtty = NULL; /* our terminal name */
|
|
||||||
struct termios ttyold, ttynew; /* our tty controlling structs */
|
|
||||||
|
|
||||||
extern int optind;
|
|
||||||
|
|
||||||
int main(int argc, char **argv);
|
|
||||||
char *finduser(void);
|
|
||||||
void settty(char *utty);
|
|
||||||
void sayhello(void);
|
|
||||||
void escape(char *cmd);
|
|
||||||
void writetty(void);
|
|
||||||
void usage(void);
|
|
||||||
void intr(int dummy);
|
|
||||||
|
|
||||||
char *finduser()
|
|
||||||
{
|
|
||||||
/* Search the UTMP database for the user we want. */
|
|
||||||
|
|
||||||
static char utmptty[16];
|
|
||||||
struct utmp utmp;
|
|
||||||
struct passwd *userptr;
|
|
||||||
int utmpfd;
|
|
||||||
|
|
||||||
ourtty = ttyname(0);
|
|
||||||
if (ourtty == NULL) ourtty = "/dev/console";
|
|
||||||
|
|
||||||
if (user == NULL) exit(-1);
|
|
||||||
if ((userptr = getpwnam(user)) == NULL) {
|
|
||||||
fprintf(stderr, "No such user: %s\n", user);
|
|
||||||
return(NULL);
|
|
||||||
}
|
|
||||||
if (verbose) fprintf(stderr, "Trying to write to %s\n",
|
|
||||||
userptr->pw_gecos);
|
|
||||||
|
|
||||||
if ((utmpfd = open(_PATH_UTMP, O_RDONLY)) < 0) {
|
|
||||||
fprintf(stderr, "Cannot open utmp file\n");
|
|
||||||
return(NULL);
|
|
||||||
}
|
|
||||||
utmptty[0] = '\0';
|
|
||||||
|
|
||||||
/* We want to find if 'user' is logged on, and return in utmptty[]
|
|
||||||
* 'user' `s terminal, and if 'user' is logged onto the tty the
|
|
||||||
* caller specified, return that tty name. */
|
|
||||||
while (read(utmpfd, (char *) &utmp, sizeof(utmp)) == sizeof(utmp)) {
|
|
||||||
/* is this the user we are looking for? */
|
|
||||||
if (strncmp(utmp.ut_name, user, sizeof(utmp.ut_name))) continue;
|
|
||||||
|
|
||||||
strcpy(utmptty, utmp.ut_line);
|
|
||||||
/* is he on the terminal we want to write to? */
|
|
||||||
if (tty == NULL || !strcmp(utmptty, tty)) {
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
if (utmptty[0] == '\0') {
|
|
||||||
fprintf(stderr, "%s is not logged on\n", user);
|
|
||||||
return( NULL);
|
|
||||||
}
|
|
||||||
if (tty != NULL && strcmp(utmptty, tty)) {
|
|
||||||
fprintf(stderr, "%s is logged onto %s, not %s\n", user, utmptty, tty);
|
|
||||||
return( NULL);
|
|
||||||
}
|
|
||||||
close(utmpfd);
|
|
||||||
|
|
||||||
if (verbose) fprintf(stderr, "Writing to %s on %s\n", user, utmptty);
|
|
||||||
return(utmptty);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
void settty(utty)
|
|
||||||
char *utty; /* name of terminal found in utmp */
|
|
||||||
{
|
|
||||||
/* Open other person's terminal and setup our own terminal. */
|
|
||||||
|
|
||||||
char buff[48];
|
|
||||||
|
|
||||||
sprintf(buff, "/dev/%s", utty);
|
|
||||||
if ((otty = open(buff, O_WRONLY)) < 0) {
|
|
||||||
fprintf(stderr, "Cannot open %s to write to %s\n", utty, user);
|
|
||||||
fprintf(stderr, "It may have write permission turned off\n");
|
|
||||||
exit(-1);
|
|
||||||
}
|
|
||||||
tcgetattr(0, &ttyold);
|
|
||||||
tcgetattr(0, &ttynew);
|
|
||||||
ttynew.c_lflag &= ~(ICANON|ECHO);
|
|
||||||
signal(SIGINT, intr);
|
|
||||||
if (cbreak) tcsetattr(0, TCSANOW, &ttynew);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
void sayhello()
|
|
||||||
{
|
|
||||||
struct passwd *pw;
|
|
||||||
char buff[128];
|
|
||||||
time_t now;
|
|
||||||
char *sp;
|
|
||||||
|
|
||||||
time(&now);
|
|
||||||
|
|
||||||
pw = getpwuid(getuid());
|
|
||||||
if (pw == NULL) {
|
|
||||||
fprintf(stderr, "unknown user\n");
|
|
||||||
exit(-1);
|
|
||||||
}
|
|
||||||
if ((sp = strrchr(ourtty, '/')) != NULL)
|
|
||||||
++sp;
|
|
||||||
else
|
|
||||||
sp = ourtty;
|
|
||||||
|
|
||||||
sprintf(buff, "\nMessage from %s (%s) %-24.24s...\n",
|
|
||||||
pw->pw_name, sp, ctime(&now));
|
|
||||||
|
|
||||||
write(otty, buff, strlen(buff));
|
|
||||||
printf("\007\007");
|
|
||||||
fflush(stdout);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
void escape(cmd)
|
|
||||||
char *cmd;
|
|
||||||
{
|
|
||||||
/* Shell escape. */
|
|
||||||
|
|
||||||
register char *x;
|
|
||||||
|
|
||||||
write(1, "!\n", 2);
|
|
||||||
for (x = cmd; *x; ++x)
|
|
||||||
if (*x == '\n') *x = '\0';
|
|
||||||
|
|
||||||
system(cmd);
|
|
||||||
write(1, "!\n", 2);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
void writetty()
|
|
||||||
{
|
|
||||||
/* The write loop. */
|
|
||||||
|
|
||||||
char line[80];
|
|
||||||
int n, cb_esc;
|
|
||||||
|
|
||||||
writing = 1;
|
|
||||||
cb_esc = 0;
|
|
||||||
|
|
||||||
while ((n = read(0, line, 79)) > 0) {
|
|
||||||
if (line[0] == '\004') break; /* EOT */
|
|
||||||
|
|
||||||
if (cbreak && line[0] == '\n') cb_esc = 1;
|
|
||||||
|
|
||||||
if (cbreak) write(1, line, n);
|
|
||||||
|
|
||||||
if (line[0] == '!') {
|
|
||||||
if (cbreak && cb_esc) {
|
|
||||||
cb_esc = 0;
|
|
||||||
tcsetattr(0, TCSANOW, &ttyold);
|
|
||||||
read(0, line, 79);
|
|
||||||
escape(line);
|
|
||||||
tcsetattr(0, TCSANOW, &ttynew);
|
|
||||||
} else if (cbreak)
|
|
||||||
write(otty, line, n);
|
|
||||||
else
|
|
||||||
escape(&line[1]);
|
|
||||||
continue;
|
|
||||||
}
|
|
||||||
write(otty, line, n);
|
|
||||||
}
|
|
||||||
write(1, "\nEOT\n", 5);
|
|
||||||
write(otty, "\nEOT\n", 5);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
void usage()
|
|
||||||
{
|
|
||||||
fprintf(stderr, "usage: write [-c] [-v] user [tty]\n");
|
|
||||||
fprintf(stderr, "\t-c : cbreak mode\n\t-v : verbose\n");
|
|
||||||
exit(-1);
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
int main(argc, argv)
|
|
||||||
int argc;
|
|
||||||
char *argv[];
|
|
||||||
{
|
|
||||||
register int c;
|
|
||||||
char *sp;
|
|
||||||
|
|
||||||
setbuf(stdout, (char *) NULL);
|
|
||||||
|
|
||||||
/* Parse options. */
|
|
||||||
while ((c = getopt(argc, argv, "cv")) != EOF) switch (c) {
|
|
||||||
case 'c': cbreak = 1; break;
|
|
||||||
case 'v': verbose = 1; break;
|
|
||||||
default:
|
|
||||||
usage();
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Parse user and tty arguments */
|
|
||||||
if (optind < argc) {
|
|
||||||
user = argv[optind++];
|
|
||||||
|
|
||||||
/* WTMP usernames are 1-8 chars */
|
|
||||||
if (strlen(user) > 8) *(user + 8) = '\0';
|
|
||||||
|
|
||||||
if (optind < argc) {
|
|
||||||
tty = argv[optind++];
|
|
||||||
if (optind < argc) usage();
|
|
||||||
}
|
|
||||||
} else
|
|
||||||
usage();
|
|
||||||
|
|
||||||
sp = finduser(); /* find which tty to write onto */
|
|
||||||
if (sp != NULL) { /* did we find one? */
|
|
||||||
settty(sp); /* setup our terminal */
|
|
||||||
sayhello(); /* print the initial message */
|
|
||||||
writetty(); /* the write loop */
|
|
||||||
tcsetattr(0, TCSANOW, &ttyold);
|
|
||||||
exit(0);
|
|
||||||
}
|
|
||||||
return(-1);
|
|
||||||
}
|
|
||||||
|
|
||||||
void intr(dummy)
|
|
||||||
int dummy; /* to satisfy the prototype */
|
|
||||||
{
|
|
||||||
/* The interrupt key has been hit. exit cleanly. */
|
|
||||||
|
|
||||||
signal(SIGINT, SIG_IGN);
|
|
||||||
fprintf(stderr, "\nInterrupt. Exiting write\n");
|
|
||||||
tcsetattr(0, TCSANOW, &ttyold);
|
|
||||||
if (writing) write(otty, "\nEOT\n", 5);
|
|
||||||
exit(0);
|
|
||||||
}
|
|
|
@ -21,7 +21,7 @@ MAN= ash.1 at.1 \
|
||||||
term.1 termcap.1 tget.1 time.1 true.1 \
|
term.1 termcap.1 tget.1 time.1 true.1 \
|
||||||
truncate.1 tty.1 umount.1 uname.1 \
|
truncate.1 tty.1 umount.1 uname.1 \
|
||||||
uud.1 uue.1 vol.1 whereis.1 which.1 \
|
uud.1 uue.1 vol.1 whereis.1 which.1 \
|
||||||
write.1 yap.1 linkfarm.1 pkg_view.1
|
yap.1 linkfarm.1 pkg_view.1
|
||||||
|
|
||||||
MLINKS += ash.1 sh.1
|
MLINKS += ash.1 sh.1
|
||||||
MLINKS += ash.1 ..1
|
MLINKS += ash.1 ..1
|
||||||
|
|
|
@ -1,41 +0,0 @@
|
||||||
.TH WRITE 1
|
|
||||||
.SH NAME
|
|
||||||
write \- send a message to a logged-in user
|
|
||||||
.SH SYNOPSIS
|
|
||||||
\fBwrite\fR [\fB\-cv\fR] \fIuser\fR [\fItty\fR]\fR
|
|
||||||
.br
|
|
||||||
.de FL
|
|
||||||
.TP
|
|
||||||
\\fB\\$1\\fR
|
|
||||||
\\$2
|
|
||||||
..
|
|
||||||
.de EX
|
|
||||||
.TP 20
|
|
||||||
\\fB\\$1\\fR
|
|
||||||
# \\$2
|
|
||||||
..
|
|
||||||
.SH OPTIONS
|
|
||||||
.TP 5
|
|
||||||
.B \-c
|
|
||||||
# Use cbreak mode
|
|
||||||
.TP 5
|
|
||||||
.B \-v
|
|
||||||
# Verbose mode
|
|
||||||
.SH EXAMPLES
|
|
||||||
.TP 20
|
|
||||||
.B write ast
|
|
||||||
# Send a message to ast
|
|
||||||
.TP 20
|
|
||||||
.B write ast tty00
|
|
||||||
# Send a message to ast on tty00
|
|
||||||
.SH DESCRIPTION
|
|
||||||
.PP
|
|
||||||
\fIWrite\fR lets a user send messages to another logged-in user.
|
|
||||||
Lines typed by the user appear on the other user's screen a line at a time
|
|
||||||
(a character at a time in the case of cbreak mode).
|
|
||||||
The file \fI/usr/adm/wtmp\fR is searched to determine which tty to send to.
|
|
||||||
If the user is logged onto more than one terminal, the \fItty\fR argument
|
|
||||||
selects the terminal. Type CTRL- D to terminate the command.
|
|
||||||
Use ! as a shell escape.
|
|
||||||
.SH "SEE ALSO"
|
|
||||||
.BR mail (1).
|
|
|
@ -214,6 +214,7 @@
|
||||||
2012/10/17 12:00:00,usr.bin/wc
|
2012/10/17 12:00:00,usr.bin/wc
|
||||||
2013/03/22 12:00:00,usr.bin/whatis
|
2013/03/22 12:00:00,usr.bin/whatis
|
||||||
2013/03/15 12:00:00,usr.bin/who
|
2013/03/15 12:00:00,usr.bin/who
|
||||||
|
2012/10/17 12:00:00,usr.bin/write
|
||||||
2012/10/17 12:00:00,usr.bin/xinstall
|
2012/10/17 12:00:00,usr.bin/xinstall
|
||||||
2013/03/15 12:00:00,usr.bin/yes
|
2013/03/15 12:00:00,usr.bin/yes
|
||||||
2012/02/10 16:16:12,usr.sbin/chroot
|
2012/02/10 16:16:12,usr.sbin/chroot
|
||||||
|
|
|
@ -32,7 +32,7 @@ SUBDIR= \
|
||||||
uuidgen \
|
uuidgen \
|
||||||
\
|
\
|
||||||
wc whatis who \
|
wc whatis who \
|
||||||
xargs xinstall yes
|
write xargs xinstall yes
|
||||||
|
|
||||||
.if !defined(__MINIX)
|
.if !defined(__MINIX)
|
||||||
SUBDIR+= ../external/zlib/pigz/bin/pigz
|
SUBDIR+= ../external/zlib/pigz/bin/pigz
|
||||||
|
|
15
usr.bin/write/Makefile
Normal file
15
usr.bin/write/Makefile
Normal file
|
@ -0,0 +1,15 @@
|
||||||
|
# $NetBSD: Makefile,v 1.8 2007/05/28 12:06:33 tls Exp $
|
||||||
|
# from: @(#)Makefile 8.1 (Berkeley) 6/6/93
|
||||||
|
|
||||||
|
.include <bsd.own.mk>
|
||||||
|
|
||||||
|
USE_FORT?= yes # setgid
|
||||||
|
PROG= write
|
||||||
|
SRCS= write.c utmpentry.c term_chk.c
|
||||||
|
BINMODE=2555
|
||||||
|
BINGRP= tty
|
||||||
|
|
||||||
|
.PATH.c: ${NETBSDSRCDIR}/usr.bin/who
|
||||||
|
CPPFLAGS+=-I${NETBSDSRCDIR}/usr.bin/who -DSUPPORT_UTMPX -DSUPPORT_UTMP
|
||||||
|
|
||||||
|
.include <bsd.prog.mk>
|
137
usr.bin/write/term_chk.c
Normal file
137
usr.bin/write/term_chk.c
Normal file
|
@ -0,0 +1,137 @@
|
||||||
|
/* $NetBSD: term_chk.c,v 1.8 2009/04/14 07:59:17 lukem Exp $ */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Copyright (c) 1989, 1993
|
||||||
|
* The Regents of the University of California. All rights reserved.
|
||||||
|
*
|
||||||
|
* This code is derived from software contributed to Berkeley by
|
||||||
|
* Jef Poskanzer and Craig Leres of the Lawrence Berkeley Laboratory.
|
||||||
|
*
|
||||||
|
* 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. 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.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <sys/cdefs.h>
|
||||||
|
#ifndef lint
|
||||||
|
__RCSID("$NetBSD: term_chk.c,v 1.8 2009/04/14 07:59:17 lukem Exp $");
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#include <sys/types.h>
|
||||||
|
#include <sys/param.h>
|
||||||
|
#include <sys/stat.h>
|
||||||
|
#include <time.h>
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <errno.h>
|
||||||
|
#include <unistd.h>
|
||||||
|
#include <paths.h>
|
||||||
|
#include <fcntl.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <err.h>
|
||||||
|
|
||||||
|
#include "term_chk.h"
|
||||||
|
|
||||||
|
/*
|
||||||
|
* term_chk - check that a terminal exists, and get the message bit
|
||||||
|
* and the access time
|
||||||
|
*/
|
||||||
|
int
|
||||||
|
term_chk(uid_t uid, const char *tty, int *msgsokP, time_t *atimeP, int ismytty,
|
||||||
|
gid_t saved_egid)
|
||||||
|
{
|
||||||
|
char path[MAXPATHLEN];
|
||||||
|
struct stat s;
|
||||||
|
int i, fd, serrno;
|
||||||
|
|
||||||
|
if (strstr(tty, "../") != NULL) {
|
||||||
|
errno = EINVAL;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
i = snprintf(path, sizeof path, _PATH_DEV "%s", tty);
|
||||||
|
if (i < 0 || i >= (int)sizeof(path)) {
|
||||||
|
errno = ENOMEM;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
(void)setegid(saved_egid);
|
||||||
|
fd = open(path, O_WRONLY, 0);
|
||||||
|
serrno = errno;
|
||||||
|
(void)setegid(getgid());
|
||||||
|
errno = serrno;
|
||||||
|
|
||||||
|
if (fd == -1)
|
||||||
|
return(-1);
|
||||||
|
if (fstat(fd, &s) == -1)
|
||||||
|
goto error;
|
||||||
|
if (!isatty(fd))
|
||||||
|
goto error;
|
||||||
|
if (s.st_uid != uid && uid != 0) {
|
||||||
|
errno = EPERM;
|
||||||
|
goto error;
|
||||||
|
}
|
||||||
|
if (msgsokP)
|
||||||
|
*msgsokP = (s.st_mode & S_IWGRP) != 0; /* group write bit */
|
||||||
|
if (atimeP)
|
||||||
|
*atimeP = s.st_atime;
|
||||||
|
if (ismytty)
|
||||||
|
(void)close(fd);
|
||||||
|
return ismytty ? 0 : fd;
|
||||||
|
error:
|
||||||
|
if (fd != -1) {
|
||||||
|
serrno = errno;
|
||||||
|
(void)close(fd);
|
||||||
|
errno = serrno;
|
||||||
|
}
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
char *
|
||||||
|
check_sender(time_t *atime, uid_t myuid, gid_t saved_egid)
|
||||||
|
{
|
||||||
|
int myttyfd;
|
||||||
|
int msgsok;
|
||||||
|
char *mytty;
|
||||||
|
|
||||||
|
/* check that sender has write enabled */
|
||||||
|
if (isatty(fileno(stdin)))
|
||||||
|
myttyfd = fileno(stdin);
|
||||||
|
else if (isatty(fileno(stdout)))
|
||||||
|
myttyfd = fileno(stdout);
|
||||||
|
else if (isatty(fileno(stderr)))
|
||||||
|
myttyfd = fileno(stderr);
|
||||||
|
else if (atime == NULL)
|
||||||
|
return NULL;
|
||||||
|
else
|
||||||
|
errx(1, "Cannot find your tty");
|
||||||
|
if ((mytty = ttyname(myttyfd)) == NULL)
|
||||||
|
err(1, "Cannot find the name of your tty");
|
||||||
|
if (strncmp(mytty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
|
||||||
|
mytty += sizeof(_PATH_DEV) - 1;
|
||||||
|
if (term_chk(myuid, mytty, &msgsok, atime, 1, saved_egid) == -1)
|
||||||
|
err(1, "%s%s", _PATH_DEV, mytty);
|
||||||
|
if (!msgsok) {
|
||||||
|
warnx(
|
||||||
|
"You have write permission turned off; no reply possible");
|
||||||
|
}
|
||||||
|
return mytty;
|
||||||
|
}
|
36
usr.bin/write/term_chk.h
Normal file
36
usr.bin/write/term_chk.h
Normal file
|
@ -0,0 +1,36 @@
|
||||||
|
/* $NetBSD: term_chk.h,v 1.2 2003/08/07 11:17:48 agc Exp $ */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Copyright (c) 1989, 1993
|
||||||
|
* The Regents of the University of California. All rights reserved.
|
||||||
|
*
|
||||||
|
* This code is derived from software contributed to Berkeley by
|
||||||
|
* Jef Poskanzer and Craig Leres of the Lawrence Berkeley Laboratory.
|
||||||
|
*
|
||||||
|
* 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. 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.
|
||||||
|
*/
|
||||||
|
|
||||||
|
int term_chk(uid_t, const char *, int *, time_t *, int, gid_t);
|
||||||
|
char *check_sender(time_t *, uid_t, gid_t);
|
106
usr.bin/write/write.1
Normal file
106
usr.bin/write/write.1
Normal file
|
@ -0,0 +1,106 @@
|
||||||
|
.\" $NetBSD: write.1,v 1.6 2003/08/07 11:17:48 agc Exp $
|
||||||
|
.\"
|
||||||
|
.\" Copyright (c) 1989, 1993
|
||||||
|
.\" The Regents of the University of California. All rights reserved.
|
||||||
|
.\"
|
||||||
|
.\" This code is derived from software contributed to Berkeley by
|
||||||
|
.\" Jef Poskanzer and Craig Leres of the Lawrence Berkeley Laboratory.
|
||||||
|
.\"
|
||||||
|
.\" 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. 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.
|
||||||
|
.\"
|
||||||
|
.\" from: @(#)write.1 8.1 (Berkeley) 6/6/93
|
||||||
|
.\"
|
||||||
|
.Dd June 6, 1993
|
||||||
|
.Dt WRITE 1
|
||||||
|
.Os
|
||||||
|
.Sh NAME
|
||||||
|
.Nm write
|
||||||
|
.Nd send a message to another user
|
||||||
|
.Sh SYNOPSIS
|
||||||
|
.Nm
|
||||||
|
.Ar user
|
||||||
|
.Op Ar ttyname
|
||||||
|
.Sh DESCRIPTION
|
||||||
|
.Nm
|
||||||
|
allows you to communicate with other users, by copying lines from
|
||||||
|
your terminal to theirs.
|
||||||
|
.Pp
|
||||||
|
When you run the
|
||||||
|
.Nm
|
||||||
|
command, the user you are writing to gets a message of the form:
|
||||||
|
.Pp
|
||||||
|
.Dl Message from yourname@yourhost on yourtty at hh:mm ...
|
||||||
|
.Pp
|
||||||
|
Any further lines you enter will be copied to the specified user's
|
||||||
|
terminal.
|
||||||
|
If the other user wants to reply, they must run
|
||||||
|
.Nm
|
||||||
|
as well.
|
||||||
|
.Pp
|
||||||
|
When you are done, type an end-of-file or interrupt character.
|
||||||
|
The other user will see the message
|
||||||
|
.Ql EOF
|
||||||
|
indicating that the
|
||||||
|
conversation is over.
|
||||||
|
.Pp
|
||||||
|
You can prevent people (other than the super-user) from writing to you
|
||||||
|
with the
|
||||||
|
.Xr mesg 1
|
||||||
|
command.
|
||||||
|
Some commands, for example
|
||||||
|
.Xr nroff 1
|
||||||
|
and
|
||||||
|
.Xr pr 1 ,
|
||||||
|
disallow writing automatically, so that your output isn't overwritten.
|
||||||
|
.Pp
|
||||||
|
If the user you want to write to is logged in on more than one terminal,
|
||||||
|
you can specify which terminal to write to by specifying the terminal
|
||||||
|
name as the second operand to the
|
||||||
|
.Nm
|
||||||
|
command.
|
||||||
|
Alternatively, you can let
|
||||||
|
.Nm
|
||||||
|
select one of the terminals \- it will pick the one with the shortest
|
||||||
|
idle time.
|
||||||
|
This is so that if the user is logged in at work and also dialed up from
|
||||||
|
home, the message will go to the right place.
|
||||||
|
.Pp
|
||||||
|
The traditional protocol for writing to someone is that the string
|
||||||
|
.Ql \-o ,
|
||||||
|
either at the end of a line or on a line by itself, means that it's the
|
||||||
|
other person's turn to talk.
|
||||||
|
The string
|
||||||
|
.Ql oo
|
||||||
|
means that the person believes the conversation to be
|
||||||
|
over.
|
||||||
|
.Sh SEE ALSO
|
||||||
|
.Xr mesg 1 ,
|
||||||
|
.Xr talk 1 ,
|
||||||
|
.Xr who 1
|
||||||
|
.Sh HISTORY
|
||||||
|
A
|
||||||
|
.Nm
|
||||||
|
command appeared in
|
||||||
|
.At v6 .
|
292
usr.bin/write/write.c
Normal file
292
usr.bin/write/write.c
Normal file
|
@ -0,0 +1,292 @@
|
||||||
|
/* $NetBSD: write.c,v 1.27 2011/09/06 18:46:35 joerg Exp $ */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Copyright (c) 1989, 1993
|
||||||
|
* The Regents of the University of California. All rights reserved.
|
||||||
|
*
|
||||||
|
* This code is derived from software contributed to Berkeley by
|
||||||
|
* Jef Poskanzer and Craig Leres of the Lawrence Berkeley Laboratory.
|
||||||
|
*
|
||||||
|
* 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. 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.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <sys/cdefs.h>
|
||||||
|
#ifndef lint
|
||||||
|
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
|
||||||
|
The Regents of the University of California. All rights reserved.");
|
||||||
|
#endif /* not lint */
|
||||||
|
|
||||||
|
#ifndef lint
|
||||||
|
#if 0
|
||||||
|
static char sccsid[] = "@(#)write.c 8.2 (Berkeley) 4/27/95";
|
||||||
|
#else
|
||||||
|
__RCSID("$NetBSD: write.c,v 1.27 2011/09/06 18:46:35 joerg Exp $");
|
||||||
|
#endif
|
||||||
|
#endif /* not lint */
|
||||||
|
|
||||||
|
#include <sys/types.h>
|
||||||
|
#include <sys/param.h>
|
||||||
|
#include <sys/stat.h>
|
||||||
|
#include <ctype.h>
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <signal.h>
|
||||||
|
#include <time.h>
|
||||||
|
#include <fcntl.h>
|
||||||
|
#include <paths.h>
|
||||||
|
#include <pwd.h>
|
||||||
|
#include <unistd.h>
|
||||||
|
#include <err.h>
|
||||||
|
#include <errno.h>
|
||||||
|
|
||||||
|
#include "utmpentry.h"
|
||||||
|
#include "term_chk.h"
|
||||||
|
|
||||||
|
__dead static void done(int);
|
||||||
|
static void do_write(int, const char *, const uid_t);
|
||||||
|
static void wr_fputs(char *);
|
||||||
|
static int search_utmp(char *, char *, uid_t, gid_t);
|
||||||
|
static int utmp_chk(const char *, const char *);
|
||||||
|
|
||||||
|
int
|
||||||
|
main(int argc, char **argv)
|
||||||
|
{
|
||||||
|
time_t atime;
|
||||||
|
uid_t myuid, uid;
|
||||||
|
int msgsok, ttyfd;
|
||||||
|
char *mytty;
|
||||||
|
gid_t saved_egid = getegid();
|
||||||
|
|
||||||
|
if (setegid(getgid()) == -1)
|
||||||
|
err(1, "setegid");
|
||||||
|
myuid = getuid();
|
||||||
|
ttyfd = -1;
|
||||||
|
|
||||||
|
mytty = check_sender(&atime, myuid, saved_egid);
|
||||||
|
|
||||||
|
/* check args */
|
||||||
|
switch (argc) {
|
||||||
|
case 2:
|
||||||
|
ttyfd = search_utmp(argv[1], mytty, myuid, saved_egid);
|
||||||
|
break;
|
||||||
|
case 3:
|
||||||
|
if (!strncmp(argv[2], _PATH_DEV, strlen(_PATH_DEV)))
|
||||||
|
argv[2] += strlen(_PATH_DEV);
|
||||||
|
if (uid_from_user(argv[1], &uid) == -1)
|
||||||
|
errx(1, "%s: unknown user", argv[1]);
|
||||||
|
if (utmp_chk(argv[1], argv[2]))
|
||||||
|
errx(1, "%s is not logged in on %s",
|
||||||
|
argv[1], argv[2]);
|
||||||
|
ttyfd = term_chk(uid, argv[2], &msgsok, &atime, 0, saved_egid);
|
||||||
|
if (ttyfd == -1)
|
||||||
|
err(1, "%s%s", _PATH_DEV, argv[2]);
|
||||||
|
if (myuid && !msgsok)
|
||||||
|
errx(1, "%s has messages disabled on %s",
|
||||||
|
argv[1], argv[2]);
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
(void)fprintf(stderr, "usage: write user [tty]\n");
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
if (setgid(getgid()) == -1)
|
||||||
|
err(1, "setgid");
|
||||||
|
do_write(ttyfd, mytty, myuid);
|
||||||
|
done(0);
|
||||||
|
/* NOTREACHED */
|
||||||
|
#ifdef __GNUC__
|
||||||
|
return (0);
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* utmp_chk - checks that the given user is actually logged in on
|
||||||
|
* the given tty
|
||||||
|
*/
|
||||||
|
static int
|
||||||
|
utmp_chk(const char *user, const char *tty)
|
||||||
|
{
|
||||||
|
struct utmpentry *ep;
|
||||||
|
|
||||||
|
(void)getutentries(NULL, &ep);
|
||||||
|
|
||||||
|
for (; ep; ep = ep->next)
|
||||||
|
if (strcmp(user, ep->name) == 0 && strcmp(tty, ep->line) == 0)
|
||||||
|
return(0);
|
||||||
|
return(1);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* search_utmp - search utmp for the "best" terminal to write to
|
||||||
|
*
|
||||||
|
* Ignores terminals with messages disabled, and of the rest, returns
|
||||||
|
* the one with the most recent access time. Returns as value the number
|
||||||
|
* of the user's terminals with messages enabled, or -1 if the user is
|
||||||
|
* not logged in at all.
|
||||||
|
*
|
||||||
|
* Special case for writing to yourself - ignore the terminal you're
|
||||||
|
* writing from, unless that's the only terminal with messages enabled.
|
||||||
|
*/
|
||||||
|
static int
|
||||||
|
search_utmp(char *user, char *mytty, uid_t myuid, gid_t saved_egid)
|
||||||
|
{
|
||||||
|
char tty[MAXPATHLEN];
|
||||||
|
time_t bestatime, atime;
|
||||||
|
int nloggedttys, nttys, msgsok, user_is_me;
|
||||||
|
struct utmpentry *ep;
|
||||||
|
int fd, nfd;
|
||||||
|
uid_t uid;
|
||||||
|
|
||||||
|
if (uid_from_user(user, &uid) == -1)
|
||||||
|
errx(1, "%s: unknown user", user);
|
||||||
|
|
||||||
|
(void)getutentries(NULL, &ep);
|
||||||
|
|
||||||
|
nloggedttys = nttys = 0;
|
||||||
|
bestatime = 0;
|
||||||
|
user_is_me = 0;
|
||||||
|
fd = -1;
|
||||||
|
for (; ep; ep = ep->next)
|
||||||
|
if (strcmp(user, ep->name) == 0) {
|
||||||
|
++nloggedttys;
|
||||||
|
nfd = term_chk(uid, ep->line, &msgsok, &atime, 0,
|
||||||
|
saved_egid);
|
||||||
|
if (nfd == -1)
|
||||||
|
continue; /* bad term? skip */
|
||||||
|
if (myuid && !msgsok) {
|
||||||
|
close(nfd);
|
||||||
|
continue; /* skip ttys with msgs off */
|
||||||
|
}
|
||||||
|
if (strcmp(ep->line, mytty) == 0) {
|
||||||
|
user_is_me = 1;
|
||||||
|
if (fd == -1)
|
||||||
|
fd = nfd;
|
||||||
|
else
|
||||||
|
close(nfd);
|
||||||
|
continue; /* don't write to yourself */
|
||||||
|
}
|
||||||
|
++nttys;
|
||||||
|
if (atime > bestatime) {
|
||||||
|
bestatime = atime;
|
||||||
|
(void)strlcpy(tty, ep->line, sizeof(tty));
|
||||||
|
close(fd);
|
||||||
|
fd = nfd;
|
||||||
|
} else
|
||||||
|
close(nfd);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (nloggedttys == 0)
|
||||||
|
errx(1, "%s is not logged in", user);
|
||||||
|
if (nttys == 0) {
|
||||||
|
if (user_is_me) /* ok, so write to yourself! */
|
||||||
|
return fd;
|
||||||
|
errx(1, "%s has messages disabled", user);
|
||||||
|
} else if (nttys > 1)
|
||||||
|
warnx("%s is logged in more than once; writing to %s",
|
||||||
|
user, tty);
|
||||||
|
return fd;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* do_write - actually make the connection
|
||||||
|
*/
|
||||||
|
static void
|
||||||
|
do_write(int ttyfd, const char *mytty, const uid_t myuid)
|
||||||
|
{
|
||||||
|
const char *login;
|
||||||
|
char *nows;
|
||||||
|
struct passwd *pwd;
|
||||||
|
time_t now;
|
||||||
|
char host[MAXHOSTNAMELEN + 1], line[512];
|
||||||
|
|
||||||
|
/* Determine our login name before we re-open stdout */
|
||||||
|
if ((login = getlogin()) == NULL) {
|
||||||
|
if ((pwd = getpwuid(myuid)) != NULL)
|
||||||
|
login = pwd->pw_name;
|
||||||
|
else login = "???";
|
||||||
|
}
|
||||||
|
|
||||||
|
if (dup2(ttyfd, STDOUT_FILENO) == -1)
|
||||||
|
err(1, "dup2");
|
||||||
|
|
||||||
|
(void)signal(SIGINT, done);
|
||||||
|
(void)signal(SIGHUP, done);
|
||||||
|
(void)close(ttyfd);
|
||||||
|
|
||||||
|
/* print greeting */
|
||||||
|
if (gethostname(host, sizeof(host)) < 0)
|
||||||
|
(void)strlcpy(host, "???", sizeof(host));
|
||||||
|
else
|
||||||
|
host[sizeof(host) - 1] = '\0';
|
||||||
|
now = time(NULL);
|
||||||
|
nows = ctime(&now);
|
||||||
|
nows[16] = '\0';
|
||||||
|
(void)printf("\r\n\a\a\aMessage from %s@%s on %s at %s ...\r\n",
|
||||||
|
login, host, mytty, nows + 11);
|
||||||
|
|
||||||
|
while (fgets(line, sizeof(line), stdin) != NULL)
|
||||||
|
wr_fputs(line);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* done - cleanup and exit
|
||||||
|
*/
|
||||||
|
static void
|
||||||
|
done(int signo)
|
||||||
|
{
|
||||||
|
|
||||||
|
(void)write(STDOUT_FILENO, "EOF\r\n", sizeof("EOF\r\n") - 1);
|
||||||
|
if (signo == 0)
|
||||||
|
exit(0);
|
||||||
|
else
|
||||||
|
_exit(0);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* wr_fputs - like fputs(), but makes control characters visible and
|
||||||
|
* turns \n into \r\n
|
||||||
|
*/
|
||||||
|
static void
|
||||||
|
wr_fputs(char *s)
|
||||||
|
{
|
||||||
|
unsigned char c;
|
||||||
|
|
||||||
|
#define PUTC(c) if (putchar(c) == EOF) goto err;
|
||||||
|
|
||||||
|
for (; *s != '\0'; ++s) {
|
||||||
|
c = toascii(*s);
|
||||||
|
if (c == '\n') {
|
||||||
|
PUTC('\r');
|
||||||
|
} else if (!isprint(c) && !isspace(c) && c != '\a') {
|
||||||
|
PUTC('^');
|
||||||
|
c ^= 0x40; /* DEL to ?, others to alpha */
|
||||||
|
}
|
||||||
|
PUTC(c);
|
||||||
|
}
|
||||||
|
return;
|
||||||
|
|
||||||
|
err: err(1, NULL);
|
||||||
|
#undef PUTC
|
||||||
|
}
|
Loading…
Reference in a new issue