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 #include <ctype.h>
33 #include <err.h>
34 #include <locale.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38 #include <wchar.h>
39 #include <wctype.h>
40
41 /*
42 * expand - expand tabs to equivalent spaces
43 */
44 static int nstops;
45 static int tabstops[100];
46
47 static void getstops(char *);
48 static void usage(void) __dead2;
49
50 int
main(int argc,char * argv[])51 main(int argc, char *argv[])
52 {
53 const char *curfile;
54 wint_t wc;
55 int c, column;
56 int n;
57 int rval;
58 int width;
59
60 setlocale(LC_CTYPE, "");
61
62 /* handle obsolete syntax */
63 while (argc > 1 && argv[1][0] == '-' &&
64 isdigit((unsigned char)argv[1][1])) {
65 getstops(&argv[1][1]);
66 argc--; argv++;
67 }
68
69 while ((c = getopt (argc, argv, "t:")) != -1) {
70 switch (c) {
71 case 't':
72 getstops(optarg);
73 break;
74 case '?':
75 default:
76 usage();
77 /* NOTREACHED */
78 }
79 }
80 argc -= optind;
81 argv += optind;
82
83 rval = 0;
84 do {
85 if (argc > 0) {
86 if (freopen(argv[0], "r", stdin) == NULL) {
87 warn("%s", argv[0]);
88 rval = 1;
89 argc--, argv++;
90 continue;
91 }
92 curfile = argv[0];
93 argc--, argv++;
94 } else
95 curfile = "stdin";
96 column = 0;
97 while ((wc = getwchar()) != WEOF) {
98 switch (wc) {
99 case '\t':
100 if (nstops == 0) {
101 do {
102 putwchar(' ');
103 column++;
104 } while (column & 07);
105 continue;
106 }
107 if (nstops == 1) {
108 do {
109 putwchar(' ');
110 column++;
111 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1));
112 continue;
113 }
114 for (n = 0; n < nstops; n++)
115 if (tabstops[n] > column)
116 break;
117 if (n == nstops) {
118 putwchar(' ');
119 column++;
120 continue;
121 }
122 while (column < tabstops[n]) {
123 putwchar(' ');
124 column++;
125 }
126 continue;
127
128 case '\b':
129 if (column)
130 column--;
131 putwchar('\b');
132 continue;
133
134 default:
135 putwchar(wc);
136 if ((width = wcwidth(wc)) > 0)
137 column += width;
138 continue;
139
140 case '\n':
141 putwchar(wc);
142 column = 0;
143 continue;
144 }
145 }
146 if (ferror(stdin)) {
147 warn("%s", curfile);
148 rval = 1;
149 }
150 } while (argc > 0);
151 exit(rval);
152 }
153
154 static void
getstops(char * cp)155 getstops(char *cp)
156 {
157 int i;
158
159 nstops = 0;
160 for (;;) {
161 i = 0;
162 while (*cp >= '0' && *cp <= '9')
163 i = i * 10 + *cp++ - '0';
164 if (i <= 0)
165 errx(1, "bad tab stop spec");
166 if (nstops > 0 && i <= tabstops[nstops-1])
167 errx(1, "bad tab stop spec");
168 if (nstops == sizeof(tabstops) / sizeof(*tabstops))
169 errx(1, "too many tab stops");
170 tabstops[nstops++] = i;
171 if (*cp == 0)
172 break;
173 if (*cp != ',' && !isblank((unsigned char)*cp))
174 errx(1, "bad tab stop spec");
175 cp++;
176 }
177 }
178
179 static void
usage(void)180 usage(void)
181 {
182 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n");
183 exit(1);
184 }
185