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Annotation of prex-old/usr/bin/cat/cat.c, Revision 1.1

1.1     ! nbrk        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: #include <sys/stat.h>
        !            34: #include <sys/fcntl.h>
        !            35:
        !            36: #include <err.h>
        !            37: #include <unistd.h>
        !            38: #include <errno.h>
        !            39: #include <stdio.h>
        !            40: #include <stdlib.h>
        !            41: #include <string.h>
        !            42:
        !            43: #ifdef CMDBOX
        !            44: #define main(argc, argv)       cat_main(argc, argv)
        !            45: #endif
        !            46:
        !            47: static void raw_cat(int rfd);
        !            48:
        !            49: static char stdbuf[BUFSIZ];
        !            50: static char *filename;
        !            51: static int rval;
        !            52:
        !            53: int
        !            54: main(int argc, char *argv[])
        !            55: {
        !            56:        int ch, fd;
        !            57:
        !            58:        while ((ch = getopt(argc, argv, "u")) != -1)
        !            59:                switch(ch) {
        !            60:                case 'u':
        !            61:                        setbuf(stdout, NULL);
        !            62:                        break;
        !            63:                case '?':
        !            64:                default:
        !            65:                        fprintf(stderr, "usage: cat [-u] [-] [file ...]\n");
        !            66:                        exit(1);
        !            67:                        /* NOTREACHED */
        !            68:                }
        !            69:        argv += optind;
        !            70:
        !            71:        fd = fileno(stdin);
        !            72:        filename = "stdin";
        !            73:        do {
        !            74:                if (*argv) {
        !            75:                        if (!strcmp(*argv, "-"))
        !            76:                                fd = fileno(stdin);
        !            77:                        else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
        !            78:                                warn("%s", *argv);
        !            79:                                ++argv;
        !            80:                                rval = 1;
        !            81:                                continue;
        !            82:                        }
        !            83:                        filename = *argv++;
        !            84:                }
        !            85:                raw_cat(fd);
        !            86:                if (fd != fileno(stdin))
        !            87:                        (void)close(fd);
        !            88:        } while (*argv);
        !            89:        exit(rval);
        !            90: }
        !            91:
        !            92: static void
        !            93: raw_cat(int rfd)
        !            94: {
        !            95:        int nr, nw, off, wfd;
        !            96:        struct stat sbuf;
        !            97:
        !            98:        wfd = fileno(stdout);
        !            99:        if (fstat(wfd, &sbuf))
        !           100:                err(1, "%s", filename);
        !           101:        while ((nr = read(rfd, stdbuf, BUFSIZ)) > 0)
        !           102:                for (off = 0; nr; nr -= nw, off += nw)
        !           103:                        if ((nw = write(wfd, stdbuf + off, (size_t)nr)) < 0)
        !           104:                                err(1, "stdout");
        !           105:        if (nr < 0) {
        !           106:                warn("%s", filename);
        !           107:                rval = 1;
        !           108:        }
        !           109: }