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Annotation of src/usr.bin/unvis/unvis.c, Revision 1.13

1.13    ! deraadt     1: /*     $OpenBSD: unvis.c,v 1.12 2014/01/22 09:45:21 jsg Exp $  */
1.2       deraadt     2:
1.1       deraadt     3: /*-
                      4:  * Copyright (c) 1989, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
1.6       millert    15:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
                     31:
1.10      millert    32: #include <err.h>
1.1       deraadt    33: #include <stdio.h>
                     34: #include <stdlib.h>
1.10      millert    35: #include <unistd.h>
1.1       deraadt    36: #include <vis.h>
                     37:
1.5       millert    38: void process(FILE *fp, const char *filename);
1.1       deraadt    39:
                     40: int
1.7       deraadt    41: main(int argc, char *argv[])
1.1       deraadt    42: {
                     43:        FILE *fp;
                     44:        int ch;
                     45:
1.13    ! deraadt    46:        if (tame("stdio rpath", NULL) == -1)
        !            47:                err(1, "tame");
        !            48:
1.3       millert    49:        while ((ch = getopt(argc, argv, "")) != -1)
1.11      okan       50:                switch(ch) {
1.1       deraadt    51:                case '?':
                     52:                default:
1.8       sobrado    53:                        (void) fprintf(stderr, "usage: unvis [file ...]\n");
1.1       deraadt    54:                        exit(1);
                     55:                }
                     56:        argc -= optind;
                     57:        argv += optind;
                     58:
                     59:        if (*argv)
                     60:                while (*argv) {
1.12      jsg        61:                        if ((fp=fopen(*argv, "r")) != NULL) {
1.1       deraadt    62:                                process(fp, *argv);
1.12      jsg        63:                                fclose(fp);
                     64:                        } else
1.1       deraadt    65:                                warn("%s", *argv);
                     66:                        argv++;
                     67:                }
1.13    ! deraadt    68:        else {
        !            69:                if (tame("stdio", NULL) == -1)
        !            70:                        err(1, "tame");
        !            71:
1.1       deraadt    72:                process(stdin, "<stdin>");
1.13    ! deraadt    73:        }
1.1       deraadt    74:        exit(0);
                     75: }
                     76:
                     77: void
1.7       deraadt    78: process(FILE *fp, const char *filename)
1.1       deraadt    79: {
1.4       mpech      80:        int offset = 0, c, ret;
1.1       deraadt    81:        int state = 0;
                     82:        char outc;
                     83:
                     84:        while ((c = getc(fp)) != EOF) {
                     85:                offset++;
                     86:        again:
                     87:                switch(ret = unvis(&outc, (char)c, &state, 0)) {
                     88:                case UNVIS_VALID:
                     89:                        putchar(outc);
                     90:                        break;
                     91:                case UNVIS_VALIDPUSH:
                     92:                        putchar(outc);
                     93:                        goto again;
                     94:                case UNVIS_SYNBAD:
                     95:                        warnx("%s: offset: %d: can't decode", filename, offset);
                     96:                        state = 0;
                     97:                        break;
                     98:                case 0:
                     99:                case UNVIS_NOCHAR:
                    100:                        break;
                    101:                default:
                    102:                        errx(1, "bad return value (%d), can't happen", ret);
                    103:                        /* NOTREACHED */
                    104:                }
                    105:        }
                    106:        if (unvis(&outc, (char)0, &state, UNVIS_END) == UNVIS_VALID)
                    107:                putchar(outc);
                    108: }