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Annotation of src/usr.bin/rev/rev.c, Revision 1.5

1.5     ! millert     1: /*     $OpenBSD: rev.c,v 1.4 2001/11/19 19:02:16 mpech 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.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  */
                     36:
                     37: #ifndef lint
                     38: static char copyright[] =
                     39: "@(#) Copyright (c) 1987, 1992, 1993\n\
                     40:        The Regents of the University of California.  All rights reserved.\n";
                     41: #endif /* not lint */
                     42:
                     43: #ifndef lint
                     44: #if 0
                     45: static char sccsid[] = "@(#)rev.c      8.3 (Berkeley) 5/4/95";
                     46: #else
1.5     ! millert    47: static char rcsid[] = "$OpenBSD: rev.c,v 1.4 2001/11/19 19:02:16 mpech Exp $";
1.1       deraadt    48: #endif
                     49: #endif /* not lint */
                     50:
                     51: #include <sys/types.h>
                     52:
                     53: #include <err.h>
                     54: #include <errno.h>
                     55: #include <stdio.h>
                     56: #include <stdlib.h>
                     57: #include <string.h>
                     58: #include <unistd.h>
                     59:
1.5     ! millert    60: void usage(void);
1.1       deraadt    61:
                     62: int
                     63: main(argc, argv)
                     64:        int argc;
                     65:        char *argv[];
                     66: {
1.4       mpech      67:        char *filename, *p, *t;
1.1       deraadt    68:        FILE *fp;
                     69:        size_t len;
                     70:        int ch, rval;
                     71:
1.3       millert    72:        while ((ch = getopt(argc, argv, "")) != -1)
1.1       deraadt    73:                switch(ch) {
                     74:                case '?':
                     75:                default:
                     76:                        usage();
                     77:                }
                     78:
                     79:        argc -= optind;
                     80:        argv += optind;
                     81:
                     82:        fp = stdin;
                     83:        filename = "stdin";
                     84:        rval = 0;
                     85:        do {
                     86:                if (*argv) {
                     87:                        if ((fp = fopen(*argv, "r")) == NULL) {
                     88:                                warn("%s", *argv);
                     89:                                rval = 1;
                     90:                                ++argv;
                     91:                                continue;
                     92:                        }
                     93:                        filename = *argv++;
                     94:                }
                     95:                while ((p = fgetln(fp, &len)) != NULL) {
                     96:                        if (p[len - 1] == '\n')
                     97:                                --len;
                     98:                        t = p + len - 1;
                     99:                        for (t = p + len - 1; t >= p; --t)
                    100:                                putchar(*t);
                    101:                        putchar('\n');
                    102:                }
                    103:                if (ferror(fp)) {
                    104:                        warn("%s", filename);
                    105:                        rval = 1;
                    106:                }
                    107:                (void)fclose(fp);
                    108:        } while(*argv);
                    109:        exit(rval);
                    110: }
                    111:
                    112: void
                    113: usage()
                    114: {
                    115:        (void)fprintf(stderr, "usage: rev [file ...]\n");
                    116:        exit(1);
                    117: }