usr/bin/cat/cat.c

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This source file includes following definitions.
main
do_cat
   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Kevin Fall.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32 
  33 /* modified by Kohsuke Ohtani for Prex. */
  34 
  35 #include <sys/stat.h>
  36 #include <sys/fcntl.h>
  37 
  38 #include <err.h>
  39 #include <unistd.h>
  40 #include <errno.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 
  45 #ifdef CMDBOX
  46 #define main(argc, argv)        cat_main(argc, argv)
  47 #endif
  48 
  49 static void do_cat(int rfd);
  50 
  51 static char *stdbuf;
  52 static char *filename;
  53 static int rval;
  54 
  55 int
  56 main(int argc, char *argv[])
  57 {
  58         int ch, fd;
  59 
  60         while ((ch = getopt(argc, argv, "")) != -1)
  61                 switch(ch) {
  62                 case '?':
  63                 default:
  64                         fprintf(stderr, "usage: cat [-] [file ...]\n");
  65                         exit(1);
  66                         /* NOTREACHED */
  67                 }
  68         argv += optind;
  69 
  70         if ((stdbuf = malloc(BUFSIZ)) == NULL)
  71                 err(1, NULL);
  72 
  73         fd = fileno(stdin);
  74         filename = "stdin";
  75         do {
  76                 if (*argv) {
  77                         if (!strcmp(*argv, "-"))
  78                                 fd = fileno(stdin);
  79                         else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
  80                                 warn("%s", *argv);
  81                                 ++argv;
  82                                 rval = 1;
  83                                 continue;
  84                         }
  85                         filename = *argv++;
  86                 }
  87                 do_cat(fd);
  88                 if (fd != fileno(stdin))
  89                         (void)close(fd);
  90         } while (*argv);
  91         free(stdbuf);
  92         exit(rval);
  93 }
  94 
  95 static void
  96 do_cat(int rfd)
  97 {
  98         int nr, nw, off, wfd;
  99         struct stat sbuf;
 100 
 101         wfd = fileno(stdout);
 102         if (fstat(wfd, &sbuf))
 103                 err(1, "%s", filename);
 104         while ((nr = read(rfd, stdbuf, BUFSIZ)) > 0)
 105                 for (off = 0; nr; nr -= nw, off += nw)
 106                         if ((nw = write(wfd, stdbuf + off, (size_t)nr)) < 0)
 107                                 err(1, "stdout");
 108         if (nr < 0) {
 109                 warn("%s @%d", filename, errno);
 110                 rval = 1;
 111         }
 112 }
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root/usr/bin/cat/cat.c

DEFINITIONS
