bin/pax/tty_subs.c

   1 /*-
   2  * Copyright (c) 1992 Keith Muller.
   3  * Copyright (c) 1992, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Keith Muller of the University of California, San Diego.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  * @(#)tty_subs.c       8.2 (Berkeley) 4/18/94
  38  * $FreeBSD: src/bin/pax/tty_subs.c,v 1.11.2.1 2001/08/01 05:03:12 obrien Exp $
  39  * $DragonFly: src/bin/pax/tty_subs.c,v 1.6 2004/11/07 20:54:51 eirikn Exp $
  40  */
  41
  42 #include <sys/types.h>
  43 #include <sys/stat.h>
  44 #include <fcntl.h>
  45 #include <stdio.h>
  46 #include <unistd.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include "pax.h"
  50 #include "extern.h"
  51 #include <stdarg.h>
  52
  53 /*
  54  * routines that deal with I/O to and from the user
  55  */
  56
  57 #define DEVTTY    "/dev/tty"      /* device for interactive i/o */
  58 static FILE *ttyoutf = NULL;            /* output pointing at control tty */
  59 static FILE *ttyinf = NULL;             /* input pointing at control tty */
  60
  61 /*
  62  * tty_init()
  63  *      try to open the controlling terminal (if any) for this process. if the
  64  *      open fails, future ops that require user input will get an EOF
  65  */
  66
  67 int
  68 tty_init(void)
  69 {
  70         int ttyfd;
  71
  72         if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
  73                 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
  74                         if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
  75                                 return(0);
  76                         fclose(ttyoutf);
  77                 }
  78                 close(ttyfd);
  79         }
  80
  81         if (iflag) {
  82                 paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
  83                 return(-1);
  84         }
  85         return(0);
  86 }
  87
  88 /*
  89  * tty_prnt()
  90  *      print a message using the specified format to the controlling tty
  91  *      if there is no controlling terminal, just return.
  92  */
  93
  94 void
  95 tty_prnt(const char *fmt, ...)
  96 {
  97         va_list ap;
  98         va_start(ap, fmt);
  99         if (ttyoutf == NULL)
 100                 return;
 101         vfprintf(ttyoutf, fmt, ap);
 102         va_end(ap);
 103         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         char *pt;
 118
 119         if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
 120                 return(-1);
 121         *(str + len) = '\0';
 122
 123         /*
 124          * strip off that trailing newline
 125          */
 126         if ((pt = strchr(str, '\n')) != NULL)
 127                 *pt = '\0';
 128         return(0);
 129 }
 130
 131 /*
 132  * paxwarn()
 133  *      write a warning message to stderr. if "set" the exit value of pax
 134  *      will be non-zero.
 135  */
 136
 137 void
 138 paxwarn(int set, const char *fmt, ...)
 139 {
 140         va_list ap;
 141         va_start(ap, fmt);
 142         if (set)
 143                 exit_val = 1;
 144         /*
 145          * when vflag we better ship out an extra \n to get this message on a
 146          * line by itself
 147          */
 148         if (vflag && vfpart) {
 149                 fflush(listf);
 150                 fputc('\n', stderr);
 151                 vfpart = 0;
 152         }
 153         fprintf(stderr, "%s: ", argv0);
 154         vfprintf(stderr, fmt, ap);
 155         va_end(ap);
 156         fputc('\n', stderr);
 157 }
 158
 159 /*
 160  * syswarn()
 161  *      write a warning message to stderr. if "set" the exit value of pax
 162  *      will be non-zero.
 163  */
 164
 165 void
 166 syswarn(int set, int errnum, const char *fmt, ...)
 167 {
 168         va_list ap;
 169         va_start(ap, fmt);
 170         if (set)
 171                 exit_val = 1;
 172         /*
 173          * when vflag we better ship out an extra \n to get this message on a
 174          * line by itself
 175          */
 176         if (vflag && vfpart) {
 177                 fflush(listf);
 178                 fputc('\n', stderr);
 179                 vfpart = 0;
 180         }
 181         fprintf(stderr, "%s: ", argv0);
 182         vfprintf(stderr, fmt, ap);
 183         va_end(ap);
 184
 185         /*
 186          * format and print the errno
 187          */
 188         if (errnum > 0)
 189                 fprintf(stderr, " <%s>", strerror(errnum));
 190         fputc('\n', stderr);
 191 }