1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 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.
15 * 3. Neither the name of the University nor the names of its contributors
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
32 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1980, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93";
41 #endif
42 #endif /* not lint */
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
45
46 #include <ctype.h>
47 #include <err.h>
48 #include <locale.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <unistd.h>
52 #include <wchar.h>
53 #include <wctype.h>
54
55 /*
56 * expand - expand tabs to equivalent spaces
57 */
58 static int nstops;
59 static int tabstops[100];
60
61 static void getstops(char *);
62 static void usage(void) __dead2;
63
64 int
main(int argc,char * argv[])65 main(int argc, char *argv[])
66 {
67 const char *curfile;
68 wint_t wc;
69 int c, column;
70 int n;
71 int rval;
72 int width;
73
74 setlocale(LC_CTYPE, "");
75
76 /* handle obsolete syntax */
77 while (argc > 1 && argv[1][0] == '-' &&
78 isdigit((unsigned char)argv[1][1])) {
79 getstops(&argv[1][1]);
80 argc--; argv++;
81 }
82
83 while ((c = getopt (argc, argv, "t:")) != -1) {
84 switch (c) {
85 case 't':
86 getstops(optarg);
87 break;
88 case '?':
89 default:
90 usage();
91 /* NOTREACHED */
92 }
93 }
94 argc -= optind;
95 argv += optind;
96
97 rval = 0;
98 do {
99 if (argc > 0) {
100 if (freopen(argv[0], "r", stdin) == NULL) {
101 warn("%s", argv[0]);
102 rval = 1;
103 argc--, argv++;
104 continue;
105 }
106 curfile = argv[0];
107 argc--, argv++;
108 } else
109 curfile = "stdin";
110 column = 0;
111 while ((wc = getwchar()) != WEOF) {
112 switch (wc) {
113 case '\t':
114 if (nstops == 0) {
115 do {
116 putwchar(' ');
117 column++;
118 } while (column & 07);
119 continue;
120 }
121 if (nstops == 1) {
122 do {
123 putwchar(' ');
124 column++;
125 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1));
126 continue;
127 }
128 for (n = 0; n < nstops; n++)
129 if (tabstops[n] > column)
130 break;
131 if (n == nstops) {
132 putwchar(' ');
133 column++;
134 continue;
135 }
136 while (column < tabstops[n]) {
137 putwchar(' ');
138 column++;
139 }
140 continue;
141
142 case '\b':
143 if (column)
144 column--;
145 putwchar('\b');
146 continue;
147
148 default:
149 putwchar(wc);
150 if ((width = wcwidth(wc)) > 0)
151 column += width;
152 continue;
153
154 case '\n':
155 putwchar(wc);
156 column = 0;
157 continue;
158 }
159 }
160 if (ferror(stdin)) {
161 warn("%s", curfile);
162 rval = 1;
163 }
164 } while (argc > 0);
165 exit(rval);
166 }
167
168 static void
getstops(char * cp)169 getstops(char *cp)
170 {
171 int i;
172
173 nstops = 0;
174 for (;;) {
175 i = 0;
176 while (*cp >= '0' && *cp <= '9')
177 i = i * 10 + *cp++ - '0';
178 if (i <= 0)
179 errx(1, "bad tab stop spec");
180 if (nstops > 0 && i <= tabstops[nstops-1])
181 errx(1, "bad tab stop spec");
182 if (nstops == sizeof(tabstops) / sizeof(*tabstops))
183 errx(1, "too many tab stops");
184 tabstops[nstops++] = i;
185 if (*cp == 0)
186 break;
187 if (*cp != ',' && !isblank((unsigned char)*cp))
188 errx(1, "bad tab stop spec");
189 cp++;
190 }
191 }
192
193 static void
usage(void)194 usage(void)
195 {
196 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n");
197 exit(1);
198 }
199