1 /* $NetBSD: unexpand.c,v 1.10 2003/04/08 10:47:03 dsl 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 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) 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 __RCSID("$NetBSD: unexpand.c,v 1.10 2003/04/08 10:47:03 dsl Exp $"); 47 #endif /* not lint */ 48 49 /* 50 * unexpand - put tabs into a file replacing blanks 51 */ 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 #include <errno.h> 57 #include <err.h> 58 59 char genbuf[BUFSIZ]; 60 char linebuf[BUFSIZ]; 61 62 int main(int, char **); 63 void tabify(int, uint); 64 65 int 66 main(int argc, char **argv) 67 { 68 int all, c; 69 uint tabsize; 70 ulong l; 71 char *ep; 72 73 setprogname(argv[0]); 74 75 all = 0; 76 tabsize = 8; 77 while ((c = getopt(argc, argv, "at:")) != -1) { 78 switch (c) { 79 case 'a': 80 all++; 81 break; 82 case 't': 83 errno = 0; 84 l = strtoul(optarg, &ep, 0); 85 /* 86 * If every input char is a tab, the line length 87 * must not exceed maxuint. 88 */ 89 tabsize = (int)l * BUFSIZ; 90 tabsize /= BUFSIZ; 91 if (*ep != 0 || errno != 0 || (ulong)tabsize != l) 92 errx(EXIT_FAILURE, "Invalid tabstop \"%s\"", 93 optarg); 94 break; 95 case '?': 96 default: 97 fprintf(stderr, "usage: %s [-a] [-t tabstop] [file ...]\n", 98 getprogname()); 99 exit(EXIT_FAILURE); 100 /* NOTREACHED */ 101 } 102 } 103 argc -= optind; 104 argv += optind; 105 106 do { 107 if (argc > 0) { 108 if (freopen(argv[0], "r", stdin) == NULL) { 109 perror(argv[0]); 110 exit(EXIT_FAILURE); 111 } 112 argc--, argv++; 113 } 114 while (fgets(genbuf, BUFSIZ, stdin) != NULL) { 115 tabify(all, tabsize); 116 printf("%s", linebuf); 117 } 118 } while (argc > 0); 119 exit(EXIT_SUCCESS); 120 /* NOTREACHED */ 121 } 122 123 void 124 tabify(int all, uint tabsize) 125 { 126 char *cp, *dp; 127 uint dcol; 128 uint ocol; 129 uint tcol; 130 131 ocol = 0; 132 dcol = 0; 133 cp = genbuf, dp = linebuf; 134 for (;;) { 135 switch (*cp) { 136 137 case ' ': 138 dcol++; 139 break; 140 141 case '\t': 142 dcol = (dcol + tabsize) / tabsize * tabsize; 143 break; 144 145 default: 146 if (dcol > ocol + 1) { 147 tcol = (ocol + tabsize) / tabsize * tabsize; 148 while (tcol <= dcol) { 149 *dp++ = '\t'; 150 ocol = tcol; 151 tcol += tabsize; 152 } 153 } 154 while (ocol < dcol) { 155 *dp++ = ' '; 156 ocol++; 157 } 158 if (*cp == 0 || all == 0) { 159 strcpy(dp, cp); 160 return; 161 } 162 *dp++ = *cp; 163 dcol = ++ocol; 164 } 165 cp++; 166 } 167 } 168