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scoutos / prex-0.9.0 / usr / bin / cat / cat.c @ 03e9c04a

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/*
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 * Copyright (c) 1989, 1993
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 *        The Regents of the University of California.  All rights reserved.
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 *
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 * This code is derived from software contributed to Berkeley by
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 * Kevin Fall.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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/* modified by Kohsuke Ohtani for Prex. */
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#include <sys/stat.h>
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#include <sys/fcntl.h>
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#include <err.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef CMDBOX
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#define main(argc, argv)        cat_main(argc, argv)
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#endif
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static void do_cat(int rfd);
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static char *stdbuf;
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static char *filename;
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static int rval;
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int
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main(int argc, char *argv[])
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{
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        int ch, fd;
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        while ((ch = getopt(argc, argv, "")) != -1)
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                switch(ch) {
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                case '?':
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                default:
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                        fprintf(stderr, "usage: cat [-] [file ...]\n");
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                        exit(1);
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                        /* NOTREACHED */
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                }
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        argv += optind;
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        if ((stdbuf = malloc(BUFSIZ)) == NULL)
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                err(1, NULL);
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        fd = fileno(stdin);
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        filename = "stdin";
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        do {
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                if (*argv) {
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                        if (!strcmp(*argv, "-"))
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                                fd = fileno(stdin);
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                        else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
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                                warn("%s", *argv);
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                                ++argv;
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                                rval = 1;
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                                continue;
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                        }
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                        filename = *argv++;
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                }
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                do_cat(fd);
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                if (fd != fileno(stdin))
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                        (void)close(fd);
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        } while (*argv);
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        free(stdbuf);
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        exit(rval);
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}
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static void
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do_cat(int rfd)
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{
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        int nr, nw, off, wfd;
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        struct stat sbuf;
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        wfd = fileno(stdout);
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        if (fstat(wfd, &sbuf))
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                err(1, "%s", filename);
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        while ((nr = read(rfd, stdbuf, BUFSIZ)) > 0)
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                for (off = 0; nr; nr -= nw, off += nw)
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                        if ((nw = write(wfd, stdbuf + off, (size_t)nr)) < 0)
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                                err(1, "stdout");
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        if (nr < 0) {
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                warn("%s @%d", filename, errno);
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                rval = 1;
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        }
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}