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[] __attribute__((__unused__)) = "$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
 105         va_start(ap, fmt);
 106         if (ttyoutf == NULL) {
 107                 va_end(ap);
 108                 return;
 109         }
 110         (void)vfprintf(ttyoutf, fmt, ap);
 111         va_end(ap);
 112         (void)fflush(ttyoutf);
 113 }
 114
 115 /*
 116  * tty_read()
 117  *      read a string from the controlling terminal if it is open into the
 118  *      supplied buffer
 119  * Return:
 120  *      0 if data was read, -1 otherwise.
 121  */
 122
 123 int
 124 tty_read(char *str, int len)
 125 {
 126         char *pt;
 127
 128         if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
 129                 return(-1);
 130         *(str + len) = '\0';
 131
 132         /*
 133          * strip off that trailing newline
 134          */
 135         if ((pt = strchr(str, '\n')) != NULL)
 136                 *pt = '\0';
 137         return(0);
 138 }
 139
 140 /*
 141  * paxwarn()
 142  *      write a warning message to stderr. if "set" the exit value of pax
 143  *      will be non-zero.
 144  */
 145
 146 void
 147 paxwarn(int set, const char *fmt, ...)
 148 {
 149         va_list ap;
 150
 151         va_start(ap, fmt);
 152         if (set && (pax_invalid_action==0))
 153                 exit_val = 1;
 154         /*
 155          * when vflag we better ship out an extra \n to get this message on a
 156          * line by itself
 157          */
 158         if (vflag && vfpart) {
 159                 (void)fflush(listf);
 160                 (void)fputc('\n', stderr);
 161                 vfpart = 0;
 162         }
 163         (void)fprintf(stderr, "%s: ", argv0);
 164         (void)vfprintf(stderr, fmt, ap);
 165         va_end(ap);
 166         (void)fputc('\n', stderr);
 167 }
 168
 169 /*
 170  * syswarn()
 171  *      write a warning message to stderr. if "set" the exit value of pax
 172  *      will be non-zero.
 173  */
 174
 175 void
 176 syswarn(int set, int errnum, const char *fmt, ...)
 177 {
 178         va_list ap;
 179
 180         va_start(ap, fmt);
 181         if (set)
 182                 exit_val = 1;
 183         /*
 184          * when vflag we better ship out an extra \n to get this message on a
 185          * line by itself
 186          */
 187         if (vflag && vfpart) {
 188                 (void)fflush(listf);
 189                 (void)fputc('\n', stderr);
 190                 vfpart = 0;
 191         }
 192         (void)fprintf(stderr, "%s: ", argv0);
 193         (void)vfprintf(stderr, fmt, ap);
 194         va_end(ap);
 195
 196         /*
 197          * format and print the errno
 198          */
 199         if (errnum > 0)
 200                 (void)fprintf(stderr, ": %s", strerror(errnum));
 201         (void)fputc('\n', stderr);
 202 }