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1.11 ! deraadt 1: /* $OpenBSD: unexpand.c,v 1.10 2009/10/27 23:59:46 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: /*
34: * unexpand - put tabs into a file replacing blanks
35: */
36: #include <stdio.h>
1.9 david 37: #include <stdlib.h>
1.1 deraadt 38: #include <string.h>
1.11 ! deraadt 39: #include <unistd.h>
1.1 deraadt 40:
41: char genbuf[BUFSIZ];
42: char linebuf[BUFSIZ];
43: int all;
44:
1.5 millert 45: void tabify(char);
1.1 deraadt 46:
47: int
1.8 deraadt 48: main(int argc, char *argv[])
1.1 deraadt 49: {
1.4 mpech 50: char *cp;
1.11 ! deraadt 51:
! 52: if (pledge("stdio rpath", NULL) == -1)
! 53: perror("pledge");
1.1 deraadt 54:
55: argc--, argv++;
56: if (argc > 0 && argv[0][0] == '-') {
57: if (strcmp(argv[0], "-a") != 0) {
1.3 deraadt 58: fprintf(stderr, "usage: unexpand [-a] [file ...]\n");
1.1 deraadt 59: exit(1);
60: }
61: all++;
62: argc--, argv++;
63: }
64: do {
65: if (argc > 0) {
66: if (freopen(argv[0], "r", stdin) == NULL) {
67: perror(argv[0]);
68: exit(1);
69: }
70: argc--, argv++;
71: }
72: while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
73: for (cp = linebuf; *cp; cp++)
74: continue;
75: if (cp > linebuf)
76: cp[-1] = 0;
77: tabify(all);
78: printf("%s", linebuf);
79: }
80: } while (argc > 0);
81: exit(0);
82: }
83:
84: void
1.8 deraadt 85: tabify(char c)
1.1 deraadt 86: {
1.4 mpech 87: char *cp, *dp;
88: int dcol;
1.1 deraadt 89: int ocol;
1.6 deraadt 90: size_t len;
1.1 deraadt 91:
92: ocol = 0;
93: dcol = 0;
1.6 deraadt 94: cp = genbuf;
95: dp = linebuf;
96: len = sizeof linebuf;
97:
1.1 deraadt 98: for (;;) {
99: switch (*cp) {
100:
101: case ' ':
102: dcol++;
103: break;
104:
105: case '\t':
106: dcol += 8;
107: dcol &= ~07;
108: break;
109:
110: default:
111: while (((ocol + 8) &~ 07) <= dcol) {
112: if (ocol + 1 == dcol)
113: break;
1.6 deraadt 114: if (len > 1) {
115: *dp++ = '\t';
116: len--;
117: }
1.1 deraadt 118: ocol += 8;
119: ocol &= ~07;
120: }
121: while (ocol < dcol) {
1.6 deraadt 122: if (len > 1) {
123: *dp++ = ' ';
124: len--;
125: }
1.1 deraadt 126: ocol++;
127: }
128: if (*cp == 0 || c == 0) {
1.6 deraadt 129: strlcpy(dp, cp, len);
1.1 deraadt 130: return;
131: }
132: *dp++ = *cp;
1.6 deraadt 133: len--;
134: ocol++;
135: dcol++;
1.1 deraadt 136: }
137: cp++;
138: }
139: }