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1.12 ! deraadt 1: /* $OpenBSD: unexpand.c,v 1.11 2015/10/10 14:23:46 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:
1.12 ! deraadt 52: if (pledge("stdio rpath", NULL) == -1) {
1.11 deraadt 53: perror("pledge");
1.12 ! deraadt 54: exit(1);
! 55: }
1.1 deraadt 56:
57: argc--, argv++;
58: if (argc > 0 && argv[0][0] == '-') {
59: if (strcmp(argv[0], "-a") != 0) {
1.3 deraadt 60: fprintf(stderr, "usage: unexpand [-a] [file ...]\n");
1.1 deraadt 61: exit(1);
62: }
63: all++;
64: argc--, argv++;
65: }
66: do {
67: if (argc > 0) {
68: if (freopen(argv[0], "r", stdin) == NULL) {
69: perror(argv[0]);
70: exit(1);
71: }
72: argc--, argv++;
73: }
74: while (fgets(genbuf, BUFSIZ, stdin) != NULL) {
75: for (cp = linebuf; *cp; cp++)
76: continue;
77: if (cp > linebuf)
78: cp[-1] = 0;
79: tabify(all);
80: printf("%s", linebuf);
81: }
82: } while (argc > 0);
83: exit(0);
84: }
85:
86: void
1.8 deraadt 87: tabify(char c)
1.1 deraadt 88: {
1.4 mpech 89: char *cp, *dp;
90: int dcol;
1.1 deraadt 91: int ocol;
1.6 deraadt 92: size_t len;
1.1 deraadt 93:
94: ocol = 0;
95: dcol = 0;
1.6 deraadt 96: cp = genbuf;
97: dp = linebuf;
98: len = sizeof linebuf;
99:
1.1 deraadt 100: for (;;) {
101: switch (*cp) {
102:
103: case ' ':
104: dcol++;
105: break;
106:
107: case '\t':
108: dcol += 8;
109: dcol &= ~07;
110: break;
111:
112: default:
113: while (((ocol + 8) &~ 07) <= dcol) {
114: if (ocol + 1 == dcol)
115: break;
1.6 deraadt 116: if (len > 1) {
117: *dp++ = '\t';
118: len--;
119: }
1.1 deraadt 120: ocol += 8;
121: ocol &= ~07;
122: }
123: while (ocol < dcol) {
1.6 deraadt 124: if (len > 1) {
125: *dp++ = ' ';
126: len--;
127: }
1.1 deraadt 128: ocol++;
129: }
130: if (*cp == 0 || c == 0) {
1.6 deraadt 131: strlcpy(dp, cp, len);
1.1 deraadt 132: return;
133: }
134: *dp++ = *cp;
1.6 deraadt 135: len--;
136: ocol++;
137: dcol++;
1.1 deraadt 138: }
139: cp++;
140: }
141: }