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Annotation of src/usr.bin/rev/rev.c, Revision 1.1.1.1

1.1       deraadt     1: /*     $NetBSD: rev.c,v 1.5 1995/09/28 08:49:40 tls Exp $      */
                      2:
                      3: /*-
                      4:  * Copyright (c) 1987, 1992, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #ifndef lint
                     37: static char copyright[] =
                     38: "@(#) Copyright (c) 1987, 1992, 1993\n\
                     39:        The Regents of the University of California.  All rights reserved.\n";
                     40: #endif /* not lint */
                     41:
                     42: #ifndef lint
                     43: #if 0
                     44: static char sccsid[] = "@(#)rev.c      8.3 (Berkeley) 5/4/95";
                     45: #else
                     46: static char rcsid[] = "$NetBSD: rev.c,v 1.5 1995/09/28 08:49:40 tls Exp $";
                     47: #endif
                     48: #endif /* not lint */
                     49:
                     50: #include <sys/types.h>
                     51:
                     52: #include <err.h>
                     53: #include <errno.h>
                     54: #include <stdio.h>
                     55: #include <stdlib.h>
                     56: #include <string.h>
                     57: #include <unistd.h>
                     58:
                     59: void usage __P((void));
                     60:
                     61: int
                     62: main(argc, argv)
                     63:        int argc;
                     64:        char *argv[];
                     65: {
                     66:        register char *filename, *p, *t;
                     67:        FILE *fp;
                     68:        size_t len;
                     69:        int ch, rval;
                     70:
                     71:        while ((ch = getopt(argc, argv, "")) != EOF)
                     72:                switch(ch) {
                     73:                case '?':
                     74:                default:
                     75:                        usage();
                     76:                }
                     77:
                     78:        argc -= optind;
                     79:        argv += optind;
                     80:
                     81:        fp = stdin;
                     82:        filename = "stdin";
                     83:        rval = 0;
                     84:        do {
                     85:                if (*argv) {
                     86:                        if ((fp = fopen(*argv, "r")) == NULL) {
                     87:                                warn("%s", *argv);
                     88:                                rval = 1;
                     89:                                ++argv;
                     90:                                continue;
                     91:                        }
                     92:                        filename = *argv++;
                     93:                }
                     94:                while ((p = fgetln(fp, &len)) != NULL) {
                     95:                        if (p[len - 1] == '\n')
                     96:                                --len;
                     97:                        t = p + len - 1;
                     98:                        for (t = p + len - 1; t >= p; --t)
                     99:                                putchar(*t);
                    100:                        putchar('\n');
                    101:                }
                    102:                if (ferror(fp)) {
                    103:                        warn("%s", filename);
                    104:                        rval = 1;
                    105:                }
                    106:                (void)fclose(fp);
                    107:        } while(*argv);
                    108:        exit(rval);
                    109: }
                    110:
                    111: void
                    112: usage()
                    113: {
                    114:        (void)fprintf(stderr, "usage: rev [file ...]\n");
                    115:        exit(1);
                    116: }