pax/tty_subs.c

   1 /*      $OpenBSD: tty_subs.c,v 1.12 2003/06/02 23:32:09 millert 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 #ifndef lint
  38 #if 0
  39 static const char sccsid[] = "@(#)tty_subs.c    8.2 (Berkeley) 4/18/94";
  40 #else
  41 static const char rcsid[] = "$OpenBSD: tty_subs.c,v 1.12 2003/06/02 23:32:09 millert Exp $";
  42 #endif
  43 #endif /* not lint */
  44
  45 #include <sys/types.h>
  46 #include <sys/time.h>
  47 #include <sys/stat.h>
  48 #include <sys/param.h>
  49 #include <fcntl.h>
  50 #include <stdio.h>
  51 #include <errno.h>
  52 #include <unistd.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include "pax.h"
  56 #include "extern.h"
  57 #include <stdarg.h>
  58
  59 /*
  60  * routines that deal with I/O to and from the user
  61  */
  62
  63 #define DEVTTY          "/dev/tty"      /* device for interactive i/o */
  64 static FILE *ttyoutf = NULL;            /* output pointing at control tty */
  65 static FILE *ttyinf = NULL;             /* input pointing at control tty */
  66
  67 /*
  68  * tty_init()
  69  *      try to open the controlling terminal (if any) for this process. if the
  70  *      open fails, future ops that require user input will get an EOF
  71  */
  72
  73 int
  74 tty_init(void)
  75 {
  76         int ttyfd;
  77
  78         if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
  79                 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
  80                         if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
  81                                 return(0);
  82                         (void)fclose(ttyoutf);
  83                 }
  84                 (void)close(ttyfd);
  85         }
  86
  87         if (iflag) {
  88                 paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
  89                 return(-1);
  90         }
  91         return(0);
  92 }
  93
  94 /*
  95  * tty_prnt()
  96  *      print a message using the specified format to the controlling tty
  97  *      if there is no controlling terminal, just return.
  98  */
  99
 100 void
 101 tty_prnt(const char *fmt, ...)
 102 {
 103         va_list ap;
 104         if (ttyoutf == NULL)
 105                 return;
 106         va_start(ap, fmt);
 107         (void)vfprintf(ttyoutf, fmt, ap);
 108         va_end(ap);
 109         (void)fflush(ttyoutf);
 110 }
 111
 112 /*
 113  * tty_read()
 114  *      read a string from the controlling terminal if it is open into the
 115  *      supplied buffer
 116  * Return:
 117  *      0 if data was read, -1 otherwise.
 118  */
 119
 120 int
 121 tty_read(char *str, int len)
 122 {
 123         char *pt;
 124
 125         if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
 126                 return(-1);
 127         *(str + len) = '\0';
 128
 129         /*
 130          * strip off that trailing newline
 131          */
 132         if ((pt = strchr(str, '\n')) != NULL)
 133                 *pt = '\0';
 134         return(0);
 135 }
 136
 137 /*
 138  * paxwarn()
 139  *      write a warning message to stderr. if "set" the exit value of pax
 140  *      will be non-zero.
 141  */
 142
 143 void
 144 paxwarn(int set, const char *fmt, ...)
 145 {
 146         va_list ap;
 147
 148         va_start(ap, fmt);
 149         if (set && (pax_invalid_action==0))
 150                 exit_val = 1;
 151         /*
 152          * when vflag we better ship out an extra \n to get this message on a
 153          * line by itself
 154          */
 155         if (vflag && vfpart) {
 156                 (void)fflush(listf);
 157                 (void)fputc('\n', stderr);
 158                 vfpart = 0;
 159         }
 160         (void)fprintf(stderr, "%s: ", argv0);
 161         (void)vfprintf(stderr, fmt, ap);
 162         va_end(ap);
 163         (void)fputc('\n', stderr);
 164 }
 165
 166 /*
 167  * syswarn()
 168  *      write a warning message to stderr. if "set" the exit value of pax
 169  *      will be non-zero.
 170  */
 171
 172 void
 173 syswarn(int set, int errnum, const char *fmt, ...)
 174 {
 175         va_list ap;
 176
 177         va_start(ap, fmt);
 178         if (set)
 179                 exit_val = 1;
 180         /*
 181          * when vflag we better ship out an extra \n to get this message on a
 182          * line by itself
 183          */
 184         if (vflag && vfpart) {
 185                 (void)fflush(listf);
 186                 (void)fputc('\n', stderr);
 187                 vfpart = 0;
 188         }
 189         (void)fprintf(stderr, "%s: ", argv0);
 190         (void)vfprintf(stderr, fmt, ap);
 191         va_end(ap);
 192
 193         /*
 194          * format and print the errno
 195          */
 196         if (errnum > 0)
 197                 (void)fprintf(stderr, " <%s>", strerror(errnum));
 198         (void)fputc('\n', stderr);
 199 }