1/*-
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: src/usr.bin/vis/vis.c,v 1.10 2002/09/04 23:29:09 dwmalone Exp $");
37
38#ifndef lint
39static const char copyright[] =
40"@(#) Copyright (c) 1989, 1993\n\
41	The Regents of the University of California.  All rights reserved.\n";
42#endif
43
44#ifndef lint
45static const char sccsid[] = "@(#)vis.c	8.1 (Berkeley) 6/6/93";
46#endif
47
48#include <err.h>
49#include <locale.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <unistd.h>
53#include <vis.h>
54#include <sysexits.h>
55
56#include "extern.h"
57
58int eflags, fold, foldwidth=80, none, markeol, debug;
59
60void process(FILE *);
61static void usage(void);
62
63int
64main(int argc, char *argv[])
65{
66	FILE *fp;
67	int ch;
68
69	(void) setlocale(LC_CTYPE, "");
70
71	while ((ch = getopt(argc, argv, "nwctsobfF:ld")) != -1)
72		switch((char)ch) {
73		case 'n':
74			none++;
75			break;
76		case 'w':
77			eflags |= VIS_WHITE;
78			break;
79		case 'c':
80			eflags |= VIS_CSTYLE;
81			break;
82		case 't':
83			eflags |= VIS_TAB;
84			break;
85		case 's':
86			eflags |= VIS_SAFE;
87			break;
88		case 'o':
89			eflags |= VIS_OCTAL;
90			break;
91		case 'b':
92			eflags |= VIS_NOSLASH;
93			break;
94		case 'F':
95			if ((foldwidth = atoi(optarg))<5)
96				errx(1, "can't fold lines to less than 5 cols");
97			/*FALLTHROUGH*/
98		case 'f':
99			fold++;		/* fold output lines to 80 cols */
100			break;		/* using hidden newline */
101		case 'l':
102			markeol++;	/* mark end of line with \$ */
103			break;
104#ifdef DEBUG
105		case 'd':
106			debug++;
107			break;
108#endif
109		case '?':
110		default:
111			usage();
112		}
113	argc -= optind;
114	argv += optind;
115
116	if (*argv)
117		while (*argv) {
118			if ((fp=fopen(*argv, "r")) != NULL)
119				process(fp);
120			else
121				warn("%s", *argv);
122			argv++;
123		}
124	else
125		process(stdin);
126	exit(0);
127}
128
129
130static void
131usage(void)
132{
133#ifdef DEBUG
134	fprintf(stderr, "usage: vis [-cbflnostwd] [-F foldwidth] [file ...]\n");
135#else
136	fprintf(stderr, "usage: vis [-cbflnostw] [-F foldwidth] [file ...]\n");
137#endif
138	exit(1);
139}
140
141void
142process(FILE *fp)
143{
144	static int col = 0;
145	static char dummy[] = "\0";
146	char *cp = dummy+1; /* so *(cp-1) starts out != '\n' */
147	int c, rachar;
148	char buff[5];
149
150	c = getc(fp);
151	while (c != EOF) {
152		rachar = getc(fp);
153		if (none) {
154			cp = buff;
155			*cp++ = c;
156			if (c == '\\')
157				*cp++ = '\\';
158			*cp = '\0';
159		} else if (markeol && c == '\n') {
160			cp = buff;
161			if ((eflags & VIS_NOSLASH) == 0)
162				*cp++ = '\\';
163			*cp++ = '$';
164			*cp++ = '\n';
165			*cp = '\0';
166		} else
167			(void) vis(buff, (char)c, eflags, (char)rachar);
168
169		cp = buff;
170		if (fold) {
171#ifdef DEBUG
172			if (debug)
173				printf("<%02d,", col);
174#endif
175			col = foldit(cp, col, foldwidth);
176#ifdef DEBUG
177			if (debug)
178				printf("%02d>", col);
179#endif
180		}
181		do {
182			putchar(*cp);
183		} while (*++cp);
184		c = rachar;
185	}
186	/*
187	 * terminate partial line with a hidden newline
188	 */
189	if (fold && *(cp-1) != '\n')
190		printf("\\\n");
191
192	if (ferror(fp))
193		errx(EX_IOERR, NULL);
194}
195