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1.6 ! deraadt 1: /* $OpenBSD: expand.c,v 1.5 2003/06/03 02:56:07 millert Exp $ */
1.1 deraadt 2: /* $NetBSD: expand.c,v 1.5 1995/09/02 06:19:46 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1980, 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.
1.5 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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: #ifndef lint
34: static char copyright[] =
35: "@(#) Copyright (c) 1980, 1993\n\
36: The Regents of the University of California. All rights reserved.\n";
37: #endif /* not lint */
38:
39: #ifndef lint
40: #if 0
41: static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93";
42: #endif
1.6 ! deraadt 43: static char rcsid[] = "$OpenBSD: expand.c,v 1.5 2003/06/03 02:56:07 millert Exp $";
1.1 deraadt 44: #endif /* not lint */
45:
46: #include <stdio.h>
47: #include <stdlib.h>
48: #include <ctype.h>
49: #include <unistd.h>
50:
51: /*
52: * expand - expand tabs to equivalent spaces
53: */
54: int nstops;
55: int tabstops[100];
56:
57: static void getstops();
58: static void usage();
59:
60: int
1.6 ! deraadt 61: main(int argc, char *argv[])
1.1 deraadt 62: {
1.4 mpech 63: int c, column;
64: int n;
1.1 deraadt 65:
66: /* handle obsolete syntax */
1.3 deraadt 67: while (argc > 1 && argv[1][0] == '-' && isdigit(argv[1][1])) {
1.1 deraadt 68: getstops(&argv[1][1]);
69: argc--; argv++;
70: }
71:
72: while ((c = getopt (argc, argv, "t:")) != -1) {
73: switch (c) {
74: case 't':
75: getstops(optarg);
76: break;
77: case '?':
78: default:
79: usage();
80: /* NOTREACHED */
81: }
82: }
83: argc -= optind;
84: argv += optind;
85:
86: do {
87: if (argc > 0) {
88: if (freopen(argv[0], "r", stdin) == NULL) {
89: perror(argv[0]);
90: exit(1);
91: }
92: argc--, argv++;
93: }
94: column = 0;
95: while ((c = getchar()) != EOF) {
96: switch (c) {
97: case '\t':
98: if (nstops == 0) {
99: do {
100: putchar(' ');
101: column++;
102: } while (column & 07);
103: continue;
104: }
105: if (nstops == 1) {
106: do {
107: putchar(' ');
108: column++;
1.6 ! deraadt 109: } while (((column - 1) %
! 110: tabstops[0]) != (tabstops[0] - 1));
1.1 deraadt 111: continue;
112: }
113: for (n = 0; n < nstops; n++)
114: if (tabstops[n] > column)
115: break;
116: if (n == nstops) {
117: putchar(' ');
118: column++;
119: continue;
120: }
121: while (column < tabstops[n]) {
122: putchar(' ');
123: column++;
124: }
125: continue;
126:
127: case '\b':
128: if (column)
129: column--;
130: putchar('\b');
131: continue;
132:
133: default:
134: putchar(c);
135: column++;
136: continue;
137:
138: case '\n':
139: putchar(c);
140: column = 0;
141: continue;
142: }
143: }
144: } while (argc > 0);
145: exit(0);
146: }
147:
148: static void
1.6 ! deraadt 149: getstops(char *cp)
1.1 deraadt 150: {
1.4 mpech 151: int i;
1.1 deraadt 152:
153: nstops = 0;
154: for (;;) {
155: i = 0;
156: while (*cp >= '0' && *cp <= '9')
157: i = i * 10 + *cp++ - '0';
158: if (i <= 0 || i > 256) {
159: bad:
160: fprintf(stderr, "Bad tab stop spec\n");
161: exit(1);
162: }
163: if (nstops > 0 && i <= tabstops[nstops-1])
164: goto bad;
165: tabstops[nstops++] = i;
166: if (*cp == 0)
167: break;
168: if (*cp != ',' && *cp != ' ')
169: goto bad;
170: cp++;
171: }
172: }
173:
174: static void
1.6 ! deraadt 175: usage(void)
1.1 deraadt 176: {
177: (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n");
178: exit(1);
179: }