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Annotation of src/usr.bin/rev/rev.c, Revision 1.16

1.16    ! cheloha     1: /*     $OpenBSD: rev.c,v 1.15 2022/01/29 00:11:54 cheloha 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:
1.15      cheloha    43: int multibyte;
                     44:
1.13      martijn    45: int isu8cont(unsigned char);
1.15      cheloha    46: int rev_file(const char *);
1.5       millert    47: void usage(void);
1.1       deraadt    48:
                     49: int
1.7       deraadt    50: main(int argc, char *argv[])
1.1       deraadt    51: {
1.15      cheloha    52:        int ch, rval;
1.11      deraadt    53:
1.13      martijn    54:        setlocale(LC_CTYPE, "");
1.14      schwarze   55:        multibyte = MB_CUR_MAX > 1;
1.13      martijn    56:
1.12      deraadt    57:        if (pledge("stdio rpath", NULL) == -1)
                     58:                err(1, "pledge");
1.1       deraadt    59:
1.3       millert    60:        while ((ch = getopt(argc, argv, "")) != -1)
1.1       deraadt    61:                switch(ch) {
                     62:                default:
                     63:                        usage();
                     64:                }
                     65:
                     66:        argc -= optind;
                     67:        argv += optind;
                     68:
                     69:        rval = 0;
1.15      cheloha    70:        if (argc == 0) {
1.16    ! cheloha    71:                if (pledge("stdio", NULL) == -1)
        !            72:                        err(1, "pledge");
        !            73:
1.15      cheloha    74:                rval = rev_file(NULL);
                     75:        } else {
                     76:                for (; *argv != NULL; argv++)
                     77:                        rval |= rev_file(*argv);
                     78:        }
1.13      martijn    79:        return rval;
                     80: }
                     81:
                     82: int
                     83: isu8cont(unsigned char c)
                     84: {
1.14      schwarze   85:        return (c & (0x80 | 0x40)) == 0x80;
1.15      cheloha    86: }
                     87:
                     88: int
                     89: rev_file(const char *path)
                     90: {
                     91:        char *p = NULL, *t, *te, *u;
                     92:        const char *filename;
                     93:        FILE *fp;
                     94:        size_t ps = 0;
                     95:        ssize_t len;
                     96:        int rval = 0;
                     97:
                     98:        if (path != NULL) {
                     99:                fp = fopen(path, "r");
                    100:                if (fp == NULL) {
                    101:                        warn("%s", path);
                    102:                        return 1;
                    103:                }
                    104:                filename = path;
                    105:        } else {
                    106:                fp = stdin;
                    107:                filename = "stdin";
                    108:        }
                    109:
                    110:        while ((len = getline(&p, &ps, fp)) != -1) {
                    111:                if (p[len - 1] == '\n')
                    112:                        --len;
                    113:                for (t = p + len - 1; t >= p; --t) {
                    114:                        te = t;
                    115:                        if (multibyte)
                    116:                                while (t > p && isu8cont(*t))
                    117:                                        --t;
                    118:                        for (u = t; u <= te; ++u)
                    119:                                if (putchar(*u) == EOF)
                    120:                                        err(1, "stdout");
                    121:                }
                    122:                if (putchar('\n') == EOF)
                    123:                        err(1, "stdout");
                    124:        }
                    125:        free(p);
                    126:        if (ferror(fp)) {
                    127:                warn("%s", filename);
                    128:                rval = 1;
                    129:        }
                    130:
                    131:        (void)fclose(fp);
                    132:
                    133:        return rval;
1.1       deraadt   134: }
                    135:
                    136: void
1.7       deraadt   137: usage(void)
1.1       deraadt   138: {
1.9       jasper    139:        extern char *__progname;
                    140:
                    141:        (void)fprintf(stderr, "usage: %s [file ...]\n", __progname);
1.1       deraadt   142:        exit(1);
                    143: }