bin/pax/tty_subs.c

   1 /*      $OpenBSD: tty_subs.c,v 1.15 2012/12/04 02:24:45 deraadt 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. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include <sys/types.h>
  38 #include <sys/time.h>
  39 #include <sys/stat.h>
  40 #include <fcntl.h>
  41 #include <stdio.h>
  42 #include <errno.h>
  43 #include <unistd.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include "pax.h"
  47 #include "extern.h"
  48 #include <stdarg.h>
  49
  50 /*
  51  * routines that deal with I/O to and from the user
  52  */
  53
  54 #define DEVTTY          "/dev/tty"      /* device for interactive i/o */
  55 static FILE *ttyoutf = NULL;            /* output pointing at control tty */
  56 static FILE *ttyinf = NULL;             /* input pointing at control tty */
  57
  58 /*
  59  * tty_init()
  60  *      try to open the controlling terminal (if any) for this process. if the
  61  *      open fails, future ops that require user input will get an EOF
  62  */
  63
  64 int
  65 tty_init(void)
  66 {
  67         int ttyfd;
  68
  69         if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
  70                 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
  71                         if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
  72                                 return(0);
  73                         (void)fclose(ttyoutf);
  74                 }
  75                 (void)close(ttyfd);
  76         }
  77
  78         if (iflag) {
  79                 paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
  80                 return(-1);
  81         }
  82         return(0);
  83 }
  84
  85 /*
  86  * tty_prnt()
  87  *      print a message using the specified format to the controlling tty
  88  *      if there is no controlling terminal, just return.
  89  */
  90
  91 void
  92 tty_prnt(const char *fmt, ...)
  93 {
  94         va_list ap;
  95
  96         va_start(ap, fmt);
  97         if (ttyoutf == NULL) {
  98                 va_end(ap);
  99                 return;
 100         }
 101         (void)vfprintf(ttyoutf, fmt, ap);
 102         va_end(ap);
 103         (void)fflush(ttyoutf);
 104 }
 105
 106 /*
 107  * tty_read()
 108  *      read a string from the controlling terminal if it is open into the
 109  *      supplied buffer
 110  * Return:
 111  *      0 if data was read, -1 otherwise.
 112  */
 113
 114 int
 115 tty_read(char *str, int len)
 116 {
 117         if (ttyinf == NULL || fgets(str, len, ttyinf) == NULL)
 118                 return(-1);
 119
 120         /*
 121          * strip off that trailing newline
 122          */
 123         str[strcspn(str, "\n")] = '\0';
 124         return(0);
 125 }
 126
 127 /*
 128  * paxwarn()
 129  *      write a warning message to stderr. if "set" the exit value of pax
 130  *      will be non-zero.
 131  */
 132
 133 void
 134 paxwarn(int set, const char *fmt, ...)
 135 {
 136         va_list ap;
 137
 138         va_start(ap, fmt);
 139         if (set)
 140                 exit_val = 1;
 141         /*
 142          * when vflag we better ship out an extra \n to get this message on a
 143          * line by itself
 144          */
 145         if (vflag && vfpart) {
 146                 (void)fflush(listf);
 147                 (void)fputc('\n', stderr);
 148                 vfpart = 0;
 149         }
 150         (void)fprintf(stderr, "%s: ", argv0);
 151         (void)vfprintf(stderr, fmt, ap);
 152         va_end(ap);
 153         (void)fputc('\n', stderr);
 154 }
 155
 156 /*
 157  * syswarn()
 158  *      write a warning message to stderr. if "set" the exit value of pax
 159  *      will be non-zero.
 160  */
 161
 162 void
 163 syswarn(int set, int errnum, const char *fmt, ...)
 164 {
 165         va_list ap;
 166
 167         va_start(ap, fmt);
 168         if (set)
 169                 exit_val = 1;
 170         /*
 171          * when vflag we better ship out an extra \n to get this message on a
 172          * line by itself
 173          */
 174         if (vflag && vfpart) {
 175                 (void)fflush(listf);
 176                 (void)fputc('\n', stderr);
 177                 vfpart = 0;
 178         }
 179         (void)fprintf(stderr, "%s: ", argv0);
 180         (void)vfprintf(stderr, fmt, ap);
 181         va_end(ap);
 182
 183         /*
 184          * format and print the errno
 185          */
 186         if (errnum > 0)
 187                 (void)fprintf(stderr, ": %s", strerror(errnum));
 188         (void)fputc('\n', stderr);
 189 }