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
42 static void asa(FILE *);
43 static void usage(void) __dead2;
44
45 int
main(int argc,char * argv[])46 main(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
83 static void
usage(void)84 usage(void)
85 {
86 fprintf(stderr, "usage: asa [file ...]\n");
87 exit(1);
88 }
89
90 static void
asa(FILE * f)91 asa(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