1 /* $OpenBSD: vis.c,v 1.22 2022/12/04 23:50:50 cheloha Exp $ */
2 /* $NetBSD: vis.c,v 1.4 1994/12/20 16:13:03 jtc Exp $ */
3
4 /*-
5 * Copyright (c) 1989, 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.
16 * 3. Neither the name of the University nor the names of its contributors
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 <stdio.h>
34 #include <string.h>
35 #include <stdlib.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <err.h>
39 #include <vis.h>
40
41 int eflags, fold, foldwidth=80, none, markeol;
42
43 #ifdef DEBUG
44 int debug;
45 #endif
46
47 int foldit(char *, int, int);
48 void process(FILE *);
49 __dead void usage(void);
50
51 int
main(int argc,char * argv[])52 main(int argc, char *argv[])
53 {
54 const char *errstr;
55 FILE *fp;
56 int ch;
57
58 if (pledge("stdio rpath", NULL) == -1)
59 err(1, "pledge");
60
61 while ((ch = getopt(argc, argv, "anwctsobfF:ld")) != -1)
62 switch(ch) {
63 case 'a':
64 eflags |= VIS_ALL;
65 break;
66 case 'n':
67 none = 1;
68 break;
69 case 'w':
70 eflags |= VIS_WHITE;
71 break;
72 case 'c':
73 eflags |= VIS_CSTYLE;
74 break;
75 case 't':
76 eflags |= VIS_TAB;
77 break;
78 case 's':
79 eflags |= VIS_SAFE;
80 break;
81 case 'o':
82 eflags |= VIS_OCTAL;
83 break;
84 case 'b':
85 eflags |= VIS_NOSLASH;
86 break;
87 case 'F':
88 foldwidth = strtonum(optarg, 1, INT_MAX, &errstr);
89 if (errstr)
90 errx(1, "%s: %s", optarg, errstr);
91 if (foldwidth < 5)
92 errx(1, "can't fold lines to less than 5 cols");
93 /*FALLTHROUGH*/
94 case 'f':
95 fold = 1; /* fold output lines to 80 cols */
96 break; /* using hidden newline */
97 case 'l':
98 markeol = 1; /* mark end of line with \$ */
99 break;
100 #ifdef DEBUG
101 case 'd':
102 debug = 1;
103 break;
104 #endif
105 default:
106 usage();
107 }
108 argc -= optind;
109 argv += optind;
110
111 if (*argv)
112 while (*argv) {
113 if ((fp=fopen(*argv, "r")) != NULL) {
114 process(fp);
115 fclose(fp);
116 } else
117 warn("%s", *argv);
118 argv++;
119 }
120 else {
121 if (pledge("stdio", NULL) == -1)
122 err(1, "pledge");
123 process(stdin);
124 }
125 exit(0);
126 }
127
128 void
process(FILE * fp)129 process(FILE *fp)
130 {
131 static int col = 0;
132 char *cp = "\0";
133 int c, rachar;
134 char buff[5];
135
136 cp++; /* so *(cp-1) starts out != '\n' */
137 c = getc(fp);
138 while (c != EOF) {
139 rachar = getc(fp);
140 if (none) {
141 cp = buff;
142 *cp++ = c;
143 if (c == '\\')
144 *cp++ = '\\';
145 *cp = '\0';
146 } else if (markeol && c == '\n') {
147 cp = buff;
148 if ((eflags & VIS_NOSLASH) == 0)
149 *cp++ = '\\';
150 *cp++ = '$';
151 *cp++ = '\n';
152 *cp = '\0';
153 } else
154 (void) vis(buff, (char)c, eflags, (char)rachar);
155
156 cp = buff;
157 if (fold) {
158 #ifdef DEBUG
159 if (debug)
160 printf("<%02d,", col);
161 #endif
162 col = foldit(cp, col, foldwidth);
163 #ifdef DEBUG
164 if (debug)
165 printf("%02d>", col);
166 #endif
167 }
168 do {
169 putchar(*cp);
170 } while (*++cp);
171 c = rachar;
172 }
173 /*
174 * terminate partial line with a hidden newline
175 */
176 if (fold && *(cp-1) != '\n')
177 printf("\\\n");
178 }
179
180 __dead void
usage(void)181 usage(void)
182 {
183 extern char *__progname;
184
185 fprintf(stderr, "usage: %s [-abcflnostw] [-F foldwidth] [file ...]\n",
186 __progname);
187 exit(1);
188 }
189