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Annotation of prex-old/usr/bin/cat/cat.c, Revision 1.1.1.1

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: }