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Annotation of src/usr.bin/rev/rev.c, Revision 1.14

1.14    ! schwarze    1: /*     $OpenBSD: rev.c,v 1.13 2016/04/10 17:06:52 martijn 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>
1.13      martijn    37: #include <locale.h>
1.1       deraadt    38: #include <stdio.h>
                     39: #include <stdlib.h>
                     40: #include <string.h>
                     41: #include <unistd.h>
                     42:
1.13      martijn    43: int isu8cont(unsigned char);
1.5       millert    44: void usage(void);
1.1       deraadt    45:
                     46: int
1.7       deraadt    47: main(int argc, char *argv[])
1.1       deraadt    48: {
1.14    ! schwarze   49:        char *filename, *p = NULL, *t, *te, *u;
1.1       deraadt    50:        FILE *fp;
1.13      martijn    51:        ssize_t len;
                     52:        size_t ps = 0;
1.14    ! schwarze   53:        int ch, multibyte, rval;
1.11      deraadt    54:
1.13      martijn    55:        setlocale(LC_CTYPE, "");
1.14    ! schwarze   56:        multibyte = MB_CUR_MAX > 1;
1.13      martijn    57:
1.12      deraadt    58:        if (pledge("stdio rpath", NULL) == -1)
                     59:                err(1, "pledge");
1.1       deraadt    60:
1.3       millert    61:        while ((ch = getopt(argc, argv, "")) != -1)
1.1       deraadt    62:                switch(ch) {
                     63:                default:
                     64:                        usage();
                     65:                }
                     66:
                     67:        argc -= optind;
                     68:        argv += optind;
                     69:
                     70:        fp = stdin;
                     71:        filename = "stdin";
                     72:        rval = 0;
                     73:        do {
                     74:                if (*argv) {
                     75:                        if ((fp = fopen(*argv, "r")) == NULL) {
                     76:                                warn("%s", *argv);
                     77:                                rval = 1;
                     78:                                ++argv;
                     79:                                continue;
                     80:                        }
                     81:                        filename = *argv++;
                     82:                }
1.13      martijn    83:                while ((len = getline(&p, &ps, fp)) != -1) {
1.1       deraadt    84:                        if (p[len - 1] == '\n')
                     85:                                --len;
1.13      martijn    86:                        for (t = p + len - 1; t >= p; --t) {
1.14    ! schwarze   87:                                te = t;
        !            88:                                if (multibyte)
        !            89:                                        while (t > p && isu8cont(*t))
        !            90:                                                --t;
        !            91:                                for (u = t; u <= te; ++u)
        !            92:                                        if (putchar(*u) == EOF)
        !            93:                                                err(1, "stdout");
1.13      martijn    94:                        }
1.14    ! schwarze   95:                        if (putchar('\n') == EOF)
        !            96:                                err(1, "stdout");
1.1       deraadt    97:                }
                     98:                if (ferror(fp)) {
                     99:                        warn("%s", filename);
                    100:                        rval = 1;
                    101:                }
                    102:                (void)fclose(fp);
                    103:        } while(*argv);
1.13      martijn   104:        return rval;
                    105: }
                    106:
                    107: int
                    108: isu8cont(unsigned char c)
                    109: {
1.14    ! schwarze  110:        return (c & (0x80 | 0x40)) == 0x80;
1.1       deraadt   111: }
                    112:
                    113: void
1.7       deraadt   114: usage(void)
1.1       deraadt   115: {
1.9       jasper    116:        extern char *__progname;
                    117:
                    118:        (void)fprintf(stderr, "usage: %s [file ...]\n", __progname);
1.1       deraadt   119:        exit(1);
                    120: }