bin/pax/tty_subs.c

   1 /*      $OpenBSD: tty_subs.c,v 1.17 2016/08/26 04:22:13 guenther 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/stat.h>
  39 #include <fcntl.h>
  40 #include <stdarg.h>
  41 #include <stdio.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44
  45 #include "pax.h"
  46 #include "extern.h"
  47
  48 /*
  49  * routines that deal with I/O to and from the user
  50  */
  51
  52 #define DEVTTY          "/dev/tty"      /* device for interactive i/o */
  53 static FILE *ttyoutf = NULL;            /* output pointing at control tty */
  54 static FILE *ttyinf = NULL;             /* input pointing at control tty */
  55
  56 /*
  57  * tty_init()
  58  *      try to open the controlling terminal (if any) for this process. if the
  59  *      open fails, future ops that require user input will get an EOF
  60  */
  61
  62 int
  63 tty_init(void)
  64 {
  65         int ttyfd;
  66
  67         if ((ttyfd = open(DEVTTY, O_RDWR | O_CLOEXEC)) >= 0) {
  68                 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
  69                         if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
  70                                 return(0);
  71                         (void)fclose(ttyoutf);
  72                 }
  73                 (void)close(ttyfd);
  74         }
  75
  76         if (iflag) {
  77                 paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
  78                 return(-1);
  79         }
  80         return(0);
  81 }
  82
  83 /*
  84  * tty_prnt()
  85  *      print a message using the specified format to the controlling tty
  86  *      if there is no controlling terminal, just return.
  87  */
  88
  89 void
  90 tty_prnt(const char *fmt, ...)
  91 {
  92         va_list ap;
  93
  94         va_start(ap, fmt);
  95         if (ttyoutf == NULL) {
  96                 va_end(ap);
  97                 return;
  98         }
  99         (void)vfprintf(ttyoutf, fmt, ap);
 100         va_end(ap);
 101         (void)fflush(ttyoutf);
 102 }
 103
 104 /*
 105  * tty_read()
 106  *      read a string from the controlling terminal if it is open into the
 107  *      supplied buffer
 108  * Return:
 109  *      0 if data was read, -1 otherwise.
 110  */
 111
 112 int
 113 tty_read(char *str, int len)
 114 {
 115         if (ttyinf == NULL || fgets(str, len, ttyinf) == NULL)
 116                 return(-1);
 117
 118         /*
 119          * strip off that trailing newline
 120          */
 121         str[strcspn(str, "\n")] = '\0';
 122         return(0);
 123 }
 124
 125 /*
 126  * paxwarn()
 127  *      write a warning message to stderr. if "set" the exit value of pax
 128  *      will be non-zero.
 129  */
 130
 131 void
 132 paxwarn(int set, const char *fmt, ...)
 133 {
 134         va_list ap;
 135
 136         va_start(ap, fmt);
 137         if (set)
 138                 exit_val = 1;
 139         /*
 140          * when vflag we better ship out an extra \n to get this message on a
 141          * line by itself
 142          */
 143         if (vflag && vfpart) {
 144                 (void)fflush(listf);
 145                 (void)fputc('\n', stderr);
 146                 vfpart = 0;
 147         }
 148         (void)fprintf(stderr, "%s: ", argv0);
 149         (void)vfprintf(stderr, fmt, ap);
 150         va_end(ap);
 151         (void)fputc('\n', stderr);
 152 }
 153
 154 /*
 155  * syswarn()
 156  *      write a warning message to stderr. if "set" the exit value of pax
 157  *      will be non-zero.
 158  */
 159
 160 void
 161 syswarn(int set, int errnum, const char *fmt, ...)
 162 {
 163         va_list ap;
 164
 165         va_start(ap, fmt);
 166         if (set)
 167                 exit_val = 1;
 168         /*
 169          * when vflag we better ship out an extra \n to get this message on a
 170          * line by itself
 171          */
 172         if (vflag && vfpart) {
 173                 (void)fflush(listf);
 174                 (void)fputc('\n', stderr);
 175                 vfpart = 0;
 176         }
 177         (void)fprintf(stderr, "%s: ", argv0);
 178         (void)vfprintf(stderr, fmt, ap);
 179         va_end(ap);
 180
 181         /*
 182          * format and print the errno
 183          */
 184         if (errnum > 0)
 185                 (void)fprintf(stderr, ": %s", strerror(errnum));
 186         (void)fputc('\n', stderr);
 187 }