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Annotation of src/usr.bin/rev/rev.c, Revision 1.9

1.9     ! jasper      1: /*     $OpenBSD: rev.c,v 1.8 2006/07/30 06:25:43 ray Exp $     */
1.1       deraadt     2: /*     $NetBSD: rev.c,v 1.5 1995/09/28 08:49:40 tls Exp $      */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1987, 1992, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      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.
1.6       millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    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: #ifndef lint
                     34: static char copyright[] =
                     35: "@(#) Copyright (c) 1987, 1992, 1993\n\
                     36:        The Regents of the University of California.  All rights reserved.\n";
                     37: #endif /* not lint */
                     38:
                     39: #ifndef lint
                     40: #if 0
                     41: static char sccsid[] = "@(#)rev.c      8.3 (Berkeley) 5/4/95";
                     42: #else
1.9     ! jasper     43: static char rcsid[] = "$OpenBSD: rev.c,v 1.8 2006/07/30 06:25:43 ray Exp $";
1.1       deraadt    44: #endif
                     45: #endif /* not lint */
                     46:
                     47: #include <sys/types.h>
                     48:
                     49: #include <err.h>
                     50: #include <errno.h>
                     51: #include <stdio.h>
                     52: #include <stdlib.h>
                     53: #include <string.h>
                     54: #include <unistd.h>
                     55:
1.5       millert    56: void usage(void);
1.1       deraadt    57:
                     58: int
1.7       deraadt    59: main(int argc, char *argv[])
1.1       deraadt    60: {
1.4       mpech      61:        char *filename, *p, *t;
1.1       deraadt    62:        FILE *fp;
                     63:        size_t len;
                     64:        int ch, rval;
                     65:
1.3       millert    66:        while ((ch = getopt(argc, argv, "")) != -1)
1.1       deraadt    67:                switch(ch) {
                     68:                case '?':
                     69:                default:
                     70:                        usage();
                     71:                }
                     72:
                     73:        argc -= optind;
                     74:        argv += optind;
                     75:
                     76:        fp = stdin;
                     77:        filename = "stdin";
                     78:        rval = 0;
                     79:        do {
                     80:                if (*argv) {
                     81:                        if ((fp = fopen(*argv, "r")) == NULL) {
                     82:                                warn("%s", *argv);
                     83:                                rval = 1;
                     84:                                ++argv;
                     85:                                continue;
                     86:                        }
                     87:                        filename = *argv++;
                     88:                }
                     89:                while ((p = fgetln(fp, &len)) != NULL) {
                     90:                        if (p[len - 1] == '\n')
                     91:                                --len;
                     92:                        for (t = p + len - 1; t >= p; --t)
                     93:                                putchar(*t);
                     94:                        putchar('\n');
                     95:                }
                     96:                if (ferror(fp)) {
                     97:                        warn("%s", filename);
                     98:                        rval = 1;
                     99:                }
                    100:                (void)fclose(fp);
                    101:        } while(*argv);
                    102:        exit(rval);
                    103: }
                    104:
                    105: void
1.7       deraadt   106: usage(void)
1.1       deraadt   107: {
1.9     ! jasper    108:        extern char *__progname;
        !           109:
        !           110:        (void)fprintf(stderr, "usage: %s [file ...]\n", __progname);
1.1       deraadt   111:        exit(1);
                    112: }