usr.bin/tee/tee.c

   1 /*
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1988, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)tee.c    8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/tee/tee.c,v 1.4 1999/08/28 01:06:21 peter Exp $
  36  * $DragonFly: src/usr.bin/tee/tee.c,v 1.5 2005/02/18 16:33:53 liamfoy Exp $
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/queue.h>
  41 #include <sys/stat.h>
  42
  43 #include <err.h>
  44 #include <fcntl.h>
  45 #include <signal.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <unistd.h>
  49
  50 struct desc_list {
  51         SLIST_ENTRY(desc_list) link;
  52         int fd;
  53         const char *name;
  54 };
  55 SLIST_HEAD(, desc_list) desc_head;
  56
  57 static void     add(int, const char *);
  58 static void     usage(void);
  59
  60 int
  61 main(int argc, char **argv)
  62 {
  63         struct desc_list *p;
  64         int n, fd, rval, wval, flags;
  65         char *bp, *buf;
  66         int append, ch, exitval;
  67 #define BSIZE (8 * 1024)
  68
  69         append = 0;
  70         while ((ch = getopt(argc, argv, "ai")) != -1)
  71                 switch(ch) {
  72                 case 'a':
  73                         append = 1;
  74                         break;
  75                 case 'i':
  76                         if (signal(SIGINT, SIG_IGN) == SIG_ERR)
  77                                 err(1, "signal");
  78                         break;
  79                 default:
  80                         usage();
  81                 }
  82         argv += optind;
  83         argc -= optind;
  84
  85         if ((buf = malloc(BSIZE)) == NULL)
  86                 err(1, "malloc failed");
  87
  88         add(STDOUT_FILENO, "stdout");
  89
  90         if (append)
  91                 flags = O_WRONLY|O_CREAT|O_APPEND;
  92         else
  93                 flags = O_WRONLY|O_CREAT|O_TRUNC;
  94
  95         for (exitval = 0; *argv != NULL; ++argv) {
  96                 if ((fd = open(*argv, flags, DEFFILEMODE)) < 0) {
  97                         warn("open failed: %s", *argv);
  98                         exitval = 1;
  99                 } else {
 100                         add(fd, *argv);
 101                 }
 102         }
 103
 104         while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0) {
 105                 SLIST_FOREACH(p, &desc_head, link) {
 106                         n = rval;
 107                         bp = buf;
 108                         do {
 109                                 if ((wval = write(p->fd, bp, n)) == -1) {
 110                                         warn("write failed: %s", p->name);
 111                                         exitval = 1;
 112                                         break;
 113                                 }
 114                                 bp += wval;
 115                         } while (n -= wval);
 116                 }
 117         }
 118         if (rval < 0)
 119                 err(1, "read failed");
 120         exit(exitval);
 121 }
 122
 123 static void
 124 usage(void)
 125 {
 126         fprintf(stderr, "usage: tee [-ai] [file ...]\n");
 127         exit(1);
 128 }
 129
 130 static void
 131 add(int fd, const char *name)
 132 {
 133         struct desc_list *p;
 134
 135         p = malloc(sizeof(struct desc_list));
 136         if (p == NULL)
 137                 err(1, "malloc failed");
 138         p->fd = fd;
 139         p->name = name;
 140         SLIST_INSERT_HEAD(&desc_head, p, link);
 141 }