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1.8 ! deraadt 1: /* $OpenBSD: unexpand.c,v 1.7 2003/06/03 02:56:20 millert 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
1.8 ! deraadt 43: static char rcsid[] = "$OpenBSD: unexpand.c,v 1.7 2003/06/03 02:56:20 millert Exp $";
1.1 deraadt 44: #endif /* not lint */
45:
46: /*
47: * unexpand - put tabs into a file replacing blanks
48: */
49: #include <stdio.h>
50: #include <string.h>
51:
52: char genbuf[BUFSIZ];
53: char linebuf[BUFSIZ];
54: int all;
55:
1.5 millert 56: void tabify(char);
1.1 deraadt 57:
58: int
1.8 ! deraadt 59: main(int argc, char *argv[])
1.1 deraadt 60: {
1.4 mpech 61: char *cp;
1.1 deraadt 62:
63: argc--, argv++;
64: if (argc > 0 && argv[0][0] == '-') {
65: if (strcmp(argv[0], "-a") != 0) {
1.3 deraadt 66: fprintf(stderr, "usage: unexpand [-a] [file ...]\n");
1.1 deraadt 67: exit(1);
68: }
69: all++;
70: argc--, argv++;
71: }
72: do {
73: if (argc > 0) {
74: if (freopen(argv[0], "r", stdin) == NULL) {
75: perror(argv[0]);
76: exit(1);
77: }
78: argc--, argv++;
79: }
80: while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
81: for (cp = linebuf; *cp; cp++)
82: continue;
83: if (cp > linebuf)
84: cp[-1] = 0;
85: tabify(all);
86: printf("%s", linebuf);
87: }
88: } while (argc > 0);
89: exit(0);
90: }
91:
92: void
1.8 ! deraadt 93: tabify(char c)
1.1 deraadt 94: {
1.4 mpech 95: char *cp, *dp;
96: int dcol;
1.1 deraadt 97: int ocol;
1.6 deraadt 98: size_t len;
1.1 deraadt 99:
100: ocol = 0;
101: dcol = 0;
1.6 deraadt 102: cp = genbuf;
103: dp = linebuf;
104: len = sizeof linebuf;
105:
1.1 deraadt 106: for (;;) {
107: switch (*cp) {
108:
109: case ' ':
110: dcol++;
111: break;
112:
113: case '\t':
114: dcol += 8;
115: dcol &= ~07;
116: break;
117:
118: default:
119: while (((ocol + 8) &~ 07) <= dcol) {
120: if (ocol + 1 == dcol)
121: break;
1.6 deraadt 122: if (len > 1) {
123: *dp++ = '\t';
124: len--;
125: }
1.1 deraadt 126: ocol += 8;
127: ocol &= ~07;
128: }
129: while (ocol < dcol) {
1.6 deraadt 130: if (len > 1) {
131: *dp++ = ' ';
132: len--;
133: }
1.1 deraadt 134: ocol++;
135: }
136: if (*cp == 0 || c == 0) {
1.6 deraadt 137: strlcpy(dp, cp, len);
1.1 deraadt 138: return;
139: }
140: *dp++ = *cp;
1.6 deraadt 141: len--;
142: ocol++;
143: dcol++;
1.1 deraadt 144: }
145: cp++;
146: }
147: }