pax/tty_subs.c

   1 /*      $OpenBSD: tty_subs.c,v 1.5 1997/07/25 18:58:39 mickey Exp $     */
   2 /*      $NetBSD: tty_subs.c,v 1.5 1995/03/21 09:07:52 cgd Exp $ */
   3
   4 /*-
   5  * Copyright (c) 1992 Keith Muller.
   6  * Copyright (c) 1992, 1993
   7  *      The Regents of the University of California.  All rights reserved.
   8  *
   9  * This code is derived from software contributed to Berkeley by
  10  * Keith Muller of the University of California, San Diego.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #ifndef lint
  42 #if 0
  43 static char sccsid[] = "@(#)tty_subs.c  8.2 (Berkeley) 4/18/94";
  44 #else
  45 static char rcsid[] __attribute__((__unused__))  = "$OpenBSD: tty_subs.c,v 1.5 1997/07/25 18:58:39 mickey Exp $";
  46 #endif
  47 #endif /* not lint */
  48
  49 #include <sys/types.h>
  50 #include <sys/time.h>
  51 #include <sys/stat.h>
  52 #include <sys/param.h>
  53 #include <fcntl.h>
  54 #include <stdio.h>
  55 #include <errno.h>
  56 #include <unistd.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include "pax.h"
  60 #include "extern.h"
  61 #ifdef __STDC__
  62 #include <stdarg.h>
  63 #else
  64 #include <varargs.h>
  65 #endif
  66
  67 /*
  68  * routines that deal with I/O to and from the user
  69  */
  70
  71 #define DEVTTY          "/dev/tty"      /* device for interactive i/o */
  72 static FILE *ttyoutf = NULL;            /* output pointing at control tty */
  73 static FILE *ttyinf = NULL;             /* input pointing at control tty */
  74
  75 /*
  76  * tty_init()
  77  *      try to open the controlling termina (if any) for this process. if the
  78  *      open fails, future ops that require user input will get an EOF
  79  */
  80
  81 #ifdef __STDC__
  82 int
  83 tty_init(void)
  84 #else
  85 int
  86 tty_init()
  87 #endif
  88 {
  89         int ttyfd;
  90
  91         if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
  92                 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
  93                         if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
  94                                 return(0);
  95                         (void)fclose(ttyoutf);
  96                 }
  97                 (void)close(ttyfd);
  98         }
  99
 100         if (iflag) {
 101                 paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
 102                 return(-1);
 103         }
 104         return(0);
 105 }
 106
 107 /*
 108  * tty_prnt()
 109  *      print a message using the specified format to the controlling tty
 110  *      if there is no controlling terminal, just return.
 111  */
 112
 113 #ifdef __STDC__
 114 void
 115 tty_prnt(char *fmt, ...)
 116 #else
 117 void
 118 tty_prnt(fmt, va_alist)
 119         char *fmt;
 120         va_dcl
 121 #endif
 122 {
 123         va_list ap;
 124 #       ifdef __STDC__
 125         va_start(ap, fmt);
 126 #       else
 127         va_start(ap);
 128 #       endif
 129         if (ttyoutf == NULL)
 130                 return;
 131         (void)vfprintf(ttyoutf, fmt, ap);
 132         va_end(ap);
 133         (void)fflush(ttyoutf);
 134 }
 135
 136 /*
 137  * tty_read()
 138  *      read a string from the controlling terminal if it is open into the
 139  *      supplied buffer
 140  * Return:
 141  *      0 if data was read, -1 otherwise.
 142  */
 143
 144 #ifdef __STDC__
 145 int
 146 tty_read(char *str, int len)
 147 #else
 148 int
 149 tty_read(str, len)
 150         char *str;
 151         int len;
 152 #endif
 153 {
 154         register char *pt;
 155
 156         if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
 157                 return(-1);
 158         *(str + len) = '\0';
 159
 160         /*
 161          * strip off that trailing newline
 162          */
 163         if ((pt = strchr(str, '\n')) != NULL)
 164                 *pt = '\0';
 165         return(0);
 166 }
 167
 168 /*
 169  * paxwarn()
 170  *      write a warning message to stderr. if "set" the exit value of pax
 171  *      will be non-zero.
 172  */
 173
 174 #ifdef __STDC__
 175 void
 176 paxwarn(int set, char *fmt, ...)
 177 #else
 178 void
 179 paxwarn(set, fmt, va_alist)
 180         int set;
 181         char *fmt;
 182         va_dcl
 183 #endif
 184 {
 185         va_list ap;
 186 #       ifdef __STDC__
 187         va_start(ap, fmt);
 188 #       else
 189         va_start(ap);
 190 #       endif
 191         if (set)
 192                 exit_val = 1;
 193         /*
 194          * when vflag we better ship out an extra \n to get this message on a
 195          * line by itself
 196          */
 197         if (vflag && vfpart) {
 198                 (void)fputc('\n', stderr);
 199                 vfpart = 0;
 200         }
 201         (void)fprintf(stderr, "%s: ", argv0);
 202         (void)vfprintf(stderr, fmt, ap);
 203         va_end(ap);
 204         (void)fputc('\n', stderr);
 205 }
 206
 207 /*
 208  * syswarn()
 209  *      write a warning message to stderr. if "set" the exit value of pax
 210  *      will be non-zero.
 211  */
 212
 213 #ifdef __STDC__
 214 void
 215 syswarn(int set, int errnum, char *fmt, ...)
 216 #else
 217 void
 218 syswarn(set, errnum, fmt, va_alist)
 219         int set;
 220         int errnum;
 221         char *fmt;
 222         va_dcl
 223 #endif
 224 {
 225         va_list ap;
 226 #       ifdef __STDC__
 227         va_start(ap, fmt);
 228 #       else
 229         va_start(ap);
 230 #       endif
 231         if (set)
 232                 exit_val = 1;
 233         /*
 234          * when vflag we better ship out an extra \n to get this message on a
 235          * line by itself
 236          */
 237         if (vflag && vfpart) {
 238                 (void)fputc('\n', stderr);
 239                 vfpart = 0;
 240         }
 241         (void)fprintf(stderr, "%s: ", argv0);
 242         (void)vfprintf(stderr, fmt, ap);
 243         va_end(ap);
 244
 245         /*
 246          * format and print the errno
 247          */
 248         if (errnum > 0)
 249                 (void)fprintf(stderr, " <%s>", strerror(errnum));
 250         (void)fputc('\n', stderr);
 251 }