1 /*- 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1980, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93"; 43 #endif 44 static const char rcsid[] = 45 "$Id: unexpand.c,v 1.2 1997/08/20 11:05:28 charnier Exp $"; 46 #endif /* not lint */ 47 48 /* 49 * unexpand - put tabs into a file replacing blanks 50 */ 51 #include <err.h> 52 #include <stdio.h> 53 54 char genbuf[BUFSIZ]; 55 char linebuf[BUFSIZ]; 56 int all; 57 58 static void usage __P((void)); 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 usage(); 72 all++; 73 argc--, argv++; 74 } 75 do { 76 if (argc > 0) { 77 if (freopen(argv[0], "r", stdin) == NULL) 78 err(1, "%s", argv[0]); 79 argc--, argv++; 80 } 81 while (fgets(genbuf, BUFSIZ, stdin) != NULL) { 82 for (cp = linebuf; *cp; cp++) 83 continue; 84 if (cp > linebuf) 85 cp[-1] = 0; 86 tabify(all); 87 printf("%s", linebuf); 88 } 89 } while (argc > 0); 90 exit(0); 91 } 92 93 static void 94 usage() 95 { 96 fprintf(stderr, "usage: unexpand [-a] file ...\n"); 97 exit(1); 98 } 99 100 void 101 tabify(c) 102 char c; 103 { 104 register char *cp, *dp; 105 register int dcol; 106 int ocol; 107 108 ocol = 0; 109 dcol = 0; 110 cp = genbuf, dp = linebuf; 111 for (;;) { 112 switch (*cp) { 113 114 case ' ': 115 dcol++; 116 break; 117 118 case '\t': 119 dcol += 8; 120 dcol &= ~07; 121 break; 122 123 default: 124 while (((ocol + 8) &~ 07) <= dcol) { 125 if (ocol + 1 == dcol) 126 break; 127 *dp++ = '\t'; 128 ocol += 8; 129 ocol &= ~07; 130 } 131 while (ocol < dcol) { 132 *dp++ = ' '; 133 ocol++; 134 } 135 if (*cp == 0 || c == 0) { 136 strcpy(dp, cp); 137 return; 138 } 139 *dp++ = *cp; 140 ocol++, dcol++; 141 } 142 cp++; 143 } 144 } 145