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 #include <sys/cdefs.h>
  38 #ifndef lint
  39 #if 0
  40 static const char sccsid[] = "@(#)tty_subs.c    8.2 (Berkeley) 4/18/94";
  41 #else
  42 __used static const char rcsid[] = "$OpenBSD: tty_subs.c,v 1.12 2003/06/02 23:32:09 millert Exp $";
  43 #endif
  44 #endif /* not lint */
  45
  46 #include <sys/types.h>
  47 #include <sys/time.h>
  48 #include <sys/stat.h>
  49 #include <sys/param.h>
  50 #include <fcntl.h>
  51 #include <stdio.h>
  52 #include <errno.h>
  53 #include <unistd.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include "pax.h"
  57 #include "extern.h"
  58 #include <stdarg.h>
  59
  60 /*
  61  * routines that deal with I/O to and from the user
  62  */
  63
  64 #define DEVTTY          "/dev/tty"      /* device for interactive i/o */
  65 static FILE *ttyoutf = NULL;            /* output pointing at control tty */
  66 static FILE *ttyinf = NULL;             /* input pointing at control tty */
  67
  68 /*
  69  * tty_init()
  70  *      try to open the controlling terminal (if any) for this process. if the
  71  *      open fails, future ops that require user input will get an EOF
  72  */
  73
  74 int
  75 tty_init(void)
  76 {
  77         int ttyfd;
  78
  79         if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
  80                 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
  81                         if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
  82                                 return(0);
  83                         (void)fclose(ttyoutf);
  84                 }
  85                 (void)close(ttyfd);
  86         }
  87
  88         if (iflag) {
  89                 paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
  90                 return(-1);
  91         }
  92         return(0);
  93 }
  94
  95 /*
  96  * tty_prnt()
  97  *      print a message using the specified format to the controlling tty
  98  *      if there is no controlling terminal, just return.
  99  */
 100
 101 void
 102 tty_prnt(const char *fmt, ...)
 103 {
 104         va_list ap;
 105         if (ttyoutf == NULL)
 106                 return;
 107         va_start(ap, fmt);
 108         (void)vfprintf(ttyoutf, fmt, ap);
 109         va_end(ap);
 110         (void)fflush(ttyoutf);
 111 }
 112
 113 /*
 114  * tty_read()
 115  *      read a string from the controlling terminal if it is open into the
 116  *      supplied buffer
 117  * Return:
 118  *      0 if data was read, -1 otherwise.
 119  */
 120
 121 int
 122 tty_read(char *str, int len)
 123 {
 124         char *pt;
 125
 126         if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
 127                 return(-1);
 128         *(str + len) = '\0';
 129
 130         /*
 131          * strip off that trailing newline
 132          */
 133         if ((pt = strchr(str, '\n')) != NULL)
 134                 *pt = '\0';
 135         return(0);
 136 }
 137
 138 /*
 139  * paxwarn()
 140  *      write a warning message to stderr. if "set" the exit value of pax
 141  *      will be non-zero.
 142  */
 143
 144 void
 145 paxwarn(int set, const char *fmt, ...)
 146 {
 147         va_list ap;
 148
 149         va_start(ap, fmt);
 150         if (set && (pax_invalid_action==0))
 151                 exit_val = 1;
 152         /*
 153          * when vflag we better ship out an extra \n to get this message on a
 154          * line by itself
 155          */
 156         if (vflag && vfpart) {
 157                 (void)fflush(listf);
 158                 (void)fputc('\n', stderr);
 159                 vfpart = 0;
 160         }
 161         (void)fprintf(stderr, "%s: ", argv0);
 162         (void)vfprintf(stderr, fmt, ap);
 163         va_end(ap);
 164         (void)fputc('\n', stderr);
 165 }
 166
 167 /*
 168  * syswarn()
 169  *      write a warning message to stderr. if "set" the exit value of pax
 170  *      will be non-zero.
 171  */
 172
 173 void
 174 syswarn(int set, int errnum, const char *fmt, ...)
 175 {
 176         va_list ap;
 177
 178         va_start(ap, fmt);
 179         if (set)
 180                 exit_val = 1;
 181         /*
 182          * when vflag we better ship out an extra \n to get this message on a
 183          * line by itself
 184          */
 185         if (vflag && vfpart) {
 186                 (void)fflush(listf);
 187                 (void)fputc('\n', stderr);
 188                 vfpart = 0;
 189         }
 190         (void)fprintf(stderr, "%s: ", argv0);
 191         (void)vfprintf(stderr, fmt, ap);
 192         va_end(ap);
 193
 194         /*
 195          * format and print the errno
 196          */
 197         if (errnum > 0)
 198                 (void)fprintf(stderr, " <%s>", strerror(errnum));
 199         (void)fputc('\n', stderr);
 200 }