1 /* $OpenBSD: unexpand.c,v 1.10 2009/10/27 23:59:46 deraadt Exp $ */ 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. 16 * 3. Neither the name of the University nor the names of its contributors 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> 37 #include <stdlib.h> 38 #include <string.h> 39 40 char genbuf[BUFSIZ]; 41 char linebuf[BUFSIZ]; 42 int all; 43 44 void tabify(char); 45 46 int 47 main(int argc, char *argv[]) 48 { 49 char *cp; 50 51 argc--, argv++; 52 if (argc > 0 && argv[0][0] == '-') { 53 if (strcmp(argv[0], "-a") != 0) { 54 fprintf(stderr, "usage: unexpand [-a] [file ...]\n"); 55 exit(1); 56 } 57 all++; 58 argc--, argv++; 59 } 60 do { 61 if (argc > 0) { 62 if (freopen(argv[0], "r", stdin) == NULL) { 63 perror(argv[0]); 64 exit(1); 65 } 66 argc--, argv++; 67 } 68 while (fgets(genbuf, BUFSIZ, stdin) != NULL) { 69 for (cp = linebuf; *cp; cp++) 70 continue; 71 if (cp > linebuf) 72 cp[-1] = 0; 73 tabify(all); 74 printf("%s", linebuf); 75 } 76 } while (argc > 0); 77 exit(0); 78 } 79 80 void 81 tabify(char c) 82 { 83 char *cp, *dp; 84 int dcol; 85 int ocol; 86 size_t len; 87 88 ocol = 0; 89 dcol = 0; 90 cp = genbuf; 91 dp = linebuf; 92 len = sizeof linebuf; 93 94 for (;;) { 95 switch (*cp) { 96 97 case ' ': 98 dcol++; 99 break; 100 101 case '\t': 102 dcol += 8; 103 dcol &= ~07; 104 break; 105 106 default: 107 while (((ocol + 8) &~ 07) <= dcol) { 108 if (ocol + 1 == dcol) 109 break; 110 if (len > 1) { 111 *dp++ = '\t'; 112 len--; 113 } 114 ocol += 8; 115 ocol &= ~07; 116 } 117 while (ocol < dcol) { 118 if (len > 1) { 119 *dp++ = ' '; 120 len--; 121 } 122 ocol++; 123 } 124 if (*cp == 0 || c == 0) { 125 strlcpy(dp, cp, len); 126 return; 127 } 128 *dp++ = *cp; 129 len--; 130 ocol++; 131 dcol++; 132 } 133 cp++; 134 } 135 } 136