1/*	$NetBSD: asa.c,v 1.17 2016/09/05 00:40:28 sevan Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-4-Clause
5 *
6 * Copyright (c) 1993,94 Winning Strategies, Inc.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *      This product includes software developed by Winning Strategies, Inc.
20 * 4. The name of the author may not be used to endorse or promote products
21 *    derived from this software without specific prior written permission
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#include <err.h>
36#include <stdbool.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <unistd.h>
41
42static void asa(FILE *);
43static void usage(void) __dead2;
44
45int
46main(int argc, char *argv[])
47{
48	FILE *fp;
49	int ch, exval;
50
51	while ((ch = getopt(argc, argv, "")) != -1) {
52		switch (ch) {
53		default:
54			usage();
55		}
56	}
57	argc -= optind;
58	argv += optind;
59
60	exval = 0;
61	if (*argv == NULL) {
62		asa(stdin);
63	} else {
64		do {
65			if (strcmp(*argv, "-") == 0) {
66				asa(stdin);
67			} else if ((fp = fopen(*argv, "r")) == NULL) {
68				warn("%s", *argv);
69				exval = 1;
70			} else {
71				asa(fp);
72				fclose(fp);
73			}
74		} while (*++argv != NULL);
75	}
76
77	if (fflush(stdout) != 0)
78		err(1, "stdout");
79
80	exit(exval);
81}
82
83static void
84usage(void)
85{
86	fprintf(stderr, "usage: asa [file ...]\n");
87	exit(1);
88}
89
90static void
91asa(FILE *f)
92{
93	char *buf;
94	size_t len;
95	bool eol = false;
96
97	while ((buf = fgetln(f, &len)) != NULL) {
98		/* in all cases but '+', terminate previous line, if any */
99		if (buf[0] != '+' && eol)
100			putchar('\n');
101		/* examine and translate the control character */
102		switch (buf[0]) {
103		default:
104			/*
105			 * ���It is suggested that implementations treat
106			 * characters other than 0, 1, and '+' as <space>
107			 * in the absence of any compelling reason to do
108			 * otherwise��� (POSIX.1-2017)
109			 */
110		case ' ':
111			/* nothing */
112			break;
113		case '0':
114			putchar('\n');
115			break;
116		case '1':
117			putchar('\f');
118			break;
119		case '+':
120			/*
121			 * ���If the '+' is the first character in the
122			 * input, it shall be equivalent to <space>.���
123			 * (POSIX.1-2017)
124			 */
125			if (eol)
126				putchar('\r');
127			break;
128		}
129		/* trim newline if there is one */
130		if ((eol = (buf[len - 1] == '\n')))
131			--len;
132		/* print the rest of the input line */
133		if (len > 1 && buf[0] && buf[1])
134			fwrite(buf + 1, 1, len - 1, stdout);
135	}
136	/* terminate the last line, if any */
137	if (eol)
138		putchar('\n');
139	/* check for output errors */
140	if (ferror(stdout) != 0)
141		err(1, "stdout");
142}
143