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1.9 ! david 1: /* $OpenBSD: unexpand.c,v 1.8 2003/06/10 22:20:53 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: unexpand.c,v 1.5 1994/12/24 17:08:05 cgd 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.
1.7 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[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93";
42: #endif
1.9 ! david 43: static char rcsid[] = "$OpenBSD: unexpand.c,v 1.8 2003/06/10 22:20:53 deraadt Exp $";
1.1 deraadt 44: #endif /* not lint */
45:
46: /*
47: * unexpand - put tabs into a file replacing blanks
48: */
49: #include <stdio.h>
1.9 ! david 50: #include <stdlib.h>
1.1 deraadt 51: #include <string.h>
52:
53: char genbuf[BUFSIZ];
54: char linebuf[BUFSIZ];
55: int all;
56:
1.5 millert 57: void tabify(char);
1.1 deraadt 58:
59: int
1.8 deraadt 60: main(int argc, char *argv[])
1.1 deraadt 61: {
1.4 mpech 62: char *cp;
1.1 deraadt 63:
64: argc--, argv++;
65: if (argc > 0 && argv[0][0] == '-') {
66: if (strcmp(argv[0], "-a") != 0) {
1.3 deraadt 67: fprintf(stderr, "usage: unexpand [-a] [file ...]\n");
1.1 deraadt 68: exit(1);
69: }
70: all++;
71: argc--, argv++;
72: }
73: do {
74: if (argc > 0) {
75: if (freopen(argv[0], "r", stdin) == NULL) {
76: perror(argv[0]);
77: exit(1);
78: }
79: argc--, argv++;
80: }
81: while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
82: for (cp = linebuf; *cp; cp++)
83: continue;
84: if (cp > linebuf)
85: cp[-1] = 0;
86: tabify(all);
87: printf("%s", linebuf);
88: }
89: } while (argc > 0);
90: exit(0);
91: }
92:
93: void
1.8 deraadt 94: tabify(char c)
1.1 deraadt 95: {
1.4 mpech 96: char *cp, *dp;
97: int dcol;
1.1 deraadt 98: int ocol;
1.6 deraadt 99: size_t len;
1.1 deraadt 100:
101: ocol = 0;
102: dcol = 0;
1.6 deraadt 103: cp = genbuf;
104: dp = linebuf;
105: len = sizeof linebuf;
106:
1.1 deraadt 107: for (;;) {
108: switch (*cp) {
109:
110: case ' ':
111: dcol++;
112: break;
113:
114: case '\t':
115: dcol += 8;
116: dcol &= ~07;
117: break;
118:
119: default:
120: while (((ocol + 8) &~ 07) <= dcol) {
121: if (ocol + 1 == dcol)
122: break;
1.6 deraadt 123: if (len > 1) {
124: *dp++ = '\t';
125: len--;
126: }
1.1 deraadt 127: ocol += 8;
128: ocol &= ~07;
129: }
130: while (ocol < dcol) {
1.6 deraadt 131: if (len > 1) {
132: *dp++ = ' ';
133: len--;
134: }
1.1 deraadt 135: ocol++;
136: }
137: if (*cp == 0 || c == 0) {
1.6 deraadt 138: strlcpy(dp, cp, len);
1.1 deraadt 139: return;
140: }
141: *dp++ = *cp;
1.6 deraadt 142: len--;
143: ocol++;
144: dcol++;
1.1 deraadt 145: }
146: cp++;
147: }
148: }