usr.bin/tee/tee.c

   1 /*      $NetBSD: tee.c,v 1.11 2013/03/06 11:44:11 yamt Exp $    */
   2
   3 /*
   4  * Copyright (c) 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1988, 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)tee.c       8.1 (Berkeley) 6/6/93";
  41 #endif
  42 __RCSID("$NetBSD: tee.c,v 1.11 2013/03/06 11:44:11 yamt Exp $");
  43 #endif
  44
  45 #include <sys/types.h>
  46 #include <sys/stat.h>
  47 #include <signal.h>
  48 #include <errno.h>
  49 #include <fcntl.h>
  50 #include <unistd.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <locale.h>
  55 #include <err.h>
  56
  57 typedef struct _list {
  58         struct _list *next;
  59         int fd;
  60         const char *name;
  61 } LIST;
  62 LIST *head;
  63
  64 void    add(int, const char *);
  65 int     main(int, char **);
  66
  67 int
  68 main(int argc, char *argv[])
  69 {
  70         LIST *p;
  71         ssize_t rval;
  72         int fd;
  73         int append, ch, exitval;
  74         char *buf;
  75 #define BSIZE (8 * 1024)
  76
  77         setlocale(LC_ALL, "");
  78
  79         append = 0;
  80         while ((ch = getopt(argc, argv, "ai")) != -1)
  81                 switch((char)ch) {
  82                 case 'a':
  83                         append = 1;
  84                         break;
  85                 case 'i':
  86                         (void)signal(SIGINT, SIG_IGN);
  87                         break;
  88                 case '?':
  89                 default:
  90                         (void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");
  91                         exit(1);
  92                 }
  93         argv += optind;
  94         argc -= optind;
  95
  96         if ((buf = malloc(BSIZE)) == NULL)
  97                 err(1, "malloc");
  98
  99         add(STDOUT_FILENO, "stdout");
 100
 101         for (exitval = 0; *argv; ++argv)
 102                 if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :
 103                     O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) {
 104                         warn("%s", *argv);
 105                         exitval = 1;
 106                 } else
 107                         add(fd, *argv);
 108
 109         while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0)
 110                 for (p = head; p; p = p->next) {
 111                         const char *bp = buf;
 112                         size_t n = rval;
 113                         ssize_t wval;
 114
 115                         do {
 116                                 if ((wval = write(p->fd, bp, n)) == -1) {
 117                                         warn("%s", p->name);
 118                                         exitval = 1;
 119                                         break;
 120                                 }
 121                                 bp += wval;
 122                         } while (n -= wval);
 123                 }
 124         if (rval < 0) {
 125                 warn("read");
 126                 exitval = 1;
 127         }
 128
 129         for (p = head; p; p = p->next) {
 130                 if (close(p->fd) == -1) {
 131                         warn("%s", p->name);
 132                         exitval = 1;
 133                 }
 134         }
 135
 136         exit(exitval);
 137 }
 138
 139 void
 140 add(int fd, const char *name)
 141 {
 142         LIST *p;
 143
 144         if ((p = malloc(sizeof(LIST))) == NULL)
 145                 err(1, "malloc");
 146         p->fd = fd;
 147         p->name = name;
 148         p->next = head;
 149         head = p;
 150 }