1 /* $NetBSD: unexpand.c,v 1.5 1994/12/24 17:08:05 cgd Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1980, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93"; 45 #endif 46 static char rcsid[] = "$NetBSD: unexpand.c,v 1.5 1994/12/24 17:08:05 cgd Exp $"; 47 #endif /* not lint */ 48 49 /* 50 * unexpand - put tabs into a file replacing blanks 51 */ 52 #include <stdio.h> 53 #include <string.h> 54 55 char genbuf[BUFSIZ]; 56 char linebuf[BUFSIZ]; 57 int all; 58 59 void tabify __P((char)); 60 61 int 62 main(argc, argv) 63 int argc; 64 char *argv[]; 65 { 66 register char *cp; 67 68 argc--, argv++; 69 if (argc > 0 && argv[0][0] == '-') { 70 if (strcmp(argv[0], "-a") != 0) { 71 fprintf(stderr, "usage: unexpand [ -a ] file ...\n"); 72 exit(1); 73 } 74 all++; 75 argc--, argv++; 76 } 77 do { 78 if (argc > 0) { 79 if (freopen(argv[0], "r", stdin) == NULL) { 80 perror(argv[0]); 81 exit(1); 82 } 83 argc--, argv++; 84 } 85 while (fgets(genbuf, BUFSIZ, stdin) != NULL) { 86 for (cp = linebuf; *cp; cp++) 87 continue; 88 if (cp > linebuf) 89 cp[-1] = 0; 90 tabify(all); 91 printf("%s", linebuf); 92 } 93 } while (argc > 0); 94 exit(0); 95 } 96 97 void 98 tabify(c) 99 char c; 100 { 101 register char *cp, *dp; 102 register int dcol; 103 int ocol; 104 105 ocol = 0; 106 dcol = 0; 107 cp = genbuf, dp = linebuf; 108 for (;;) { 109 switch (*cp) { 110 111 case ' ': 112 dcol++; 113 break; 114 115 case '\t': 116 dcol += 8; 117 dcol &= ~07; 118 break; 119 120 default: 121 while (((ocol + 8) &~ 07) <= dcol) { 122 if (ocol + 1 == dcol) 123 break; 124 *dp++ = '\t'; 125 ocol += 8; 126 ocol &= ~07; 127 } 128 while (ocol < dcol) { 129 *dp++ = ' '; 130 ocol++; 131 } 132 if (*cp == 0 || c == 0) { 133 strcpy(dp, cp); 134 return; 135 } 136 *dp++ = *cp; 137 ocol++, dcol++; 138 } 139 cp++; 140 } 141 } 142