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Annotation of src/usr.bin/rev/rev.c, Revision 1.11

1.11    ! deraadt     1: /*     $OpenBSD: rev.c,v 1.10 2009/10/27 23:59:42 deraadt 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: #include <sys/types.h>
                     34:
                     35: #include <err.h>
                     36: #include <errno.h>
                     37: #include <stdio.h>
                     38: #include <stdlib.h>
                     39: #include <string.h>
                     40: #include <unistd.h>
                     41:
1.5       millert    42: void usage(void);
1.1       deraadt    43:
                     44: int
1.7       deraadt    45: main(int argc, char *argv[])
1.1       deraadt    46: {
1.4       mpech      47:        char *filename, *p, *t;
1.1       deraadt    48:        FILE *fp;
                     49:        size_t len;
                     50:        int ch, rval;
1.11    ! deraadt    51:
        !            52:        if (tame("stdio rpath", NULL) == -1)
        !            53:                err(1, "tame");
1.1       deraadt    54:
1.3       millert    55:        while ((ch = getopt(argc, argv, "")) != -1)
1.1       deraadt    56:                switch(ch) {
                     57:                case '?':
                     58:                default:
                     59:                        usage();
                     60:                }
                     61:
                     62:        argc -= optind;
                     63:        argv += optind;
                     64:
                     65:        fp = stdin;
                     66:        filename = "stdin";
                     67:        rval = 0;
                     68:        do {
                     69:                if (*argv) {
                     70:                        if ((fp = fopen(*argv, "r")) == NULL) {
                     71:                                warn("%s", *argv);
                     72:                                rval = 1;
                     73:                                ++argv;
                     74:                                continue;
                     75:                        }
                     76:                        filename = *argv++;
                     77:                }
                     78:                while ((p = fgetln(fp, &len)) != NULL) {
                     79:                        if (p[len - 1] == '\n')
                     80:                                --len;
                     81:                        for (t = p + len - 1; t >= p; --t)
                     82:                                putchar(*t);
                     83:                        putchar('\n');
                     84:                }
                     85:                if (ferror(fp)) {
                     86:                        warn("%s", filename);
                     87:                        rval = 1;
                     88:                }
                     89:                (void)fclose(fp);
                     90:        } while(*argv);
                     91:        exit(rval);
                     92: }
                     93:
                     94: void
1.7       deraadt    95: usage(void)
1.1       deraadt    96: {
1.9       jasper     97:        extern char *__progname;
                     98:
                     99:        (void)fprintf(stderr, "usage: %s [file ...]\n", __progname);
1.1       deraadt   100:        exit(1);
                    101: }