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/* $OpenBSD: tty_subs.c,v 1.17 2016/08/26 04:22:13 guenther Exp $ */
/* $NetBSD: tty_subs.c,v 1.5 1995/03/21 09:07:52 cgd Exp $ */
/*-
* Copyright (c) 1992 Keith Muller.
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Keith Muller of the University of California, San Diego.
*
* 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/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "pax.h"
#include "extern.h"
/*
* routines that deal with I/O to and from the user
*/
#define DEVTTY "/dev/tty" /* device for interactive i/o */
static FILE *ttyoutf = NULL; /* output pointing at control tty */
static FILE *ttyinf = NULL; /* input pointing at control tty */
/*
* tty_init()
* try to open the controlling terminal (if any) for this process. if the
* open fails, future ops that require user input will get an EOF
*/
int
tty_init(void)
{
int ttyfd;
if ((ttyfd = open(DEVTTY, O_RDWR | O_CLOEXEC)) >= 0) {
if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
return(0);
(void)fclose(ttyoutf);
}
(void)close(ttyfd);
}
if (iflag) {
paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
return(-1);
}
return(0);
}
/*
* tty_prnt()
* print a message using the specified format to the controlling tty
* if there is no controlling terminal, just return.
*/
void
tty_prnt(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (ttyoutf == NULL) {
va_end(ap);
return;
}
(void)vfprintf(ttyoutf, fmt, ap);
va_end(ap);
(void)fflush(ttyoutf);
}
/*
* tty_read()
* read a string from the controlling terminal if it is open into the
* supplied buffer
* Return:
* 0 if data was read, -1 otherwise.
*/
int
tty_read(char *str, int len)
{
if (ttyinf == NULL || fgets(str, len, ttyinf) == NULL)
return(-1);
/*
* strip off that trailing newline
*/
str[strcspn(str, "\n")] = '\0';
return(0);
}
/*
* paxwarn()
* write a warning message to stderr. if "set" the exit value of pax
* will be non-zero.
*/
void
paxwarn(int set, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (set)
exit_val = 1;
/*
* when vflag we better ship out an extra \n to get this message on a
* line by itself
*/
if (vflag && vfpart) {
(void)fflush(listf);
(void)fputc('\n', stderr);
vfpart = 0;
}
(void)fprintf(stderr, "%s: ", argv0);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
(void)fputc('\n', stderr);
}
/*
* syswarn()
* write a warning message to stderr. if "set" the exit value of pax
* will be non-zero.
*/
void
syswarn(int set, int errnum, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (set)
exit_val = 1;
/*
* when vflag we better ship out an extra \n to get this message on a
* line by itself
*/
if (vflag && vfpart) {
(void)fflush(listf);
(void)fputc('\n', stderr);
vfpart = 0;
}
(void)fprintf(stderr, "%s: ", argv0);
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
/*
* format and print the errno
*/
if (errnum > 0)
(void)fprintf(stderr, ": %s", strerror(errnum));
(void)fputc('\n', stderr);
}
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