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 "$FreeBSD$"; 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 #include <string.h> 54 55 char genbuf[BUFSIZ]; 56 char linebuf[BUFSIZ]; 57 int all; 58 59 static void usage __P((void)); 60 void tabify __P((char)); 61 62 int 63 main(argc, argv) 64 int argc; 65 char *argv[]; 66 { 67 register char *cp; 68 69 argc--, argv++; 70 if (argc > 0 && argv[0][0] == '-') { 71 if (strcmp(argv[0], "-a") != 0) 72 usage(); 73 all++; 74 argc--, argv++; 75 } 76 do { 77 if (argc > 0) { 78 if (freopen(argv[0], "r", stdin) == NULL) 79 err(1, "%s", argv[0]); 80 argc--, argv++; 81 } 82 while (fgets(genbuf, BUFSIZ, stdin) != NULL) { 83 for (cp = linebuf; *cp; cp++) 84 continue; 85 if (cp > linebuf) 86 cp[-1] = 0; 87 tabify(all); 88 printf("%s", linebuf); 89 } 90 } while (argc > 0); 91 exit(0); 92 } 93 94 static void 95 usage() 96 { 97 fprintf(stderr, "usage: unexpand [-a] file ...\n"); 98 exit(1); 99 } 100 101 void 102 tabify(c) 103 char c; 104 { 105 register char *cp, *dp; 106 register int dcol; 107 int ocol; 108 109 ocol = 0; 110 dcol = 0; 111 cp = genbuf, dp = linebuf; 112 for (;;) { 113 switch (*cp) { 114 115 case ' ': 116 dcol++; 117 break; 118 119 case '\t': 120 dcol += 8; 121 dcol &= ~07; 122 break; 123 124 default: 125 while (((ocol + 8) &~ 07) <= dcol) { 126 if (ocol + 1 == dcol) 127 break; 128 *dp++ = '\t'; 129 ocol += 8; 130 ocol &= ~07; 131 } 132 while (ocol < dcol) { 133 *dp++ = ' '; 134 ocol++; 135 } 136 if (*cp == 0 || c == 0) { 137 strcpy(dp, cp); 138 return; 139 } 140 *dp++ = *cp; 141 ocol++, dcol++; 142 } 143 cp++; 144 } 145 } 146