1 /* $NetBSD: unexpand.c,v 1.4 1994/12/20 01:30:26 jtc 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 1.4 1994/12/20 01:30:26 jtc Exp $"; 47 #endif /* not lint */ 48 49 /* 50 * unexpand - put tabs into a file replacing blanks 51 */ 52 #include <stdio.h> 53 54 char genbuf[BUFSIZ]; 55 char linebuf[BUFSIZ]; 56 int all; 57 58 void tabify __P((char)); 59 60 int 61 main(argc, argv) 62 int argc; 63 char *argv[]; 64 { 65 register char *cp; 66 67 argc--, argv++; 68 if (argc > 0 && argv[0][0] == '-') { 69 if (strcmp(argv[0], "-a") != 0) { 70 fprintf(stderr, "usage: unexpand [ -a ] file ...\n"); 71 exit(1); 72 } 73 all++; 74 argc--, argv++; 75 } 76 do { 77 if (argc > 0) { 78 if (freopen(argv[0], "r", stdin) == NULL) { 79 perror(argv[0]); 80 exit(1); 81 } 82 argc--, argv++; 83 } 84 while (fgets(genbuf, BUFSIZ, stdin) != NULL) { 85 for (cp = linebuf; *cp; cp++) 86 continue; 87 if (cp > linebuf) 88 cp[-1] = 0; 89 tabify(all); 90 printf("%s", linebuf); 91 } 92 } while (argc > 0); 93 exit(0); 94 } 95 96 void 97 tabify(c) 98 char c; 99 { 100 register char *cp, *dp; 101 register int dcol; 102 int ocol; 103 104 ocol = 0; 105 dcol = 0; 106 cp = genbuf, dp = linebuf; 107 for (;;) { 108 switch (*cp) { 109 110 case ' ': 111 dcol++; 112 break; 113 114 case '\t': 115 dcol += 8; 116 dcol &= ~07; 117 break; 118 119 default: 120 while (((ocol + 8) &~ 07) <= dcol) { 121 if (ocol + 1 == dcol) 122 break; 123 *dp++ = '\t'; 124 ocol += 8; 125 ocol &= ~07; 126 } 127 while (ocol < dcol) { 128 *dp++ = ' '; 129 ocol++; 130 } 131 if (*cp == 0 || c == 0) { 132 strcpy(dp, cp); 133 return; 134 } 135 *dp++ = *cp; 136 ocol++, dcol++; 137 } 138 cp++; 139 } 140 } 141