1 /* $NetBSD: unexpand.c,v 1.12 2003/08/07 11:16:54 agc 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93"; 41 #endif 42 __RCSID("$NetBSD: unexpand.c,v 1.12 2003/08/07 11:16:54 agc Exp $"); 43 #endif /* not lint */ 44 45 /* 46 * unexpand - put tabs into a file replacing blanks 47 */ 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 #include <errno.h> 53 #include <err.h> 54 55 char genbuf[BUFSIZ]; 56 char linebuf[BUFSIZ]; 57 58 int main(int, char **); 59 void tabify(int, uint); 60 61 int 62 main(int argc, char **argv) 63 { 64 int all, c; 65 uint tabsize; 66 ulong l; 67 char *ep; 68 69 setprogname(argv[0]); 70 71 all = 0; 72 tabsize = 8; 73 while ((c = getopt(argc, argv, "at:")) != -1) { 74 switch (c) { 75 case 'a': 76 all++; 77 break; 78 case 't': 79 errno = 0; 80 l = strtoul(optarg, &ep, 0); 81 /* 82 * If every input char is a tab, the line length 83 * must not exceed maxuint. 84 */ 85 tabsize = (int)l * BUFSIZ; 86 tabsize /= BUFSIZ; 87 if (*ep != 0 || errno != 0 || (ulong)tabsize != l) 88 errx(EXIT_FAILURE, "Invalid tabstop \"%s\"", 89 optarg); 90 break; 91 case '?': 92 default: 93 fprintf(stderr, "usage: %s [-a] [-t tabstop] [file ...]\n", 94 getprogname()); 95 exit(EXIT_FAILURE); 96 /* NOTREACHED */ 97 } 98 } 99 argc -= optind; 100 argv += optind; 101 102 do { 103 if (argc > 0) { 104 if (freopen(argv[0], "r", stdin) == NULL) { 105 perror(argv[0]); 106 exit(EXIT_FAILURE); 107 } 108 argc--, argv++; 109 } 110 while (fgets(genbuf, BUFSIZ, stdin) != NULL) { 111 tabify(all, tabsize); 112 printf("%s", linebuf); 113 } 114 } while (argc > 0); 115 exit(EXIT_SUCCESS); 116 /* NOTREACHED */ 117 } 118 119 void 120 tabify(int all, uint tabsize) 121 { 122 char *cp, *dp; 123 uint dcol; 124 uint ocol; 125 uint tcol; 126 127 ocol = 0; 128 dcol = 0; 129 cp = genbuf, dp = linebuf; 130 for (;;) { 131 switch (*cp) { 132 133 case ' ': 134 dcol++; 135 break; 136 137 case '\t': 138 dcol = (dcol + tabsize) / tabsize * tabsize; 139 break; 140 141 default: 142 if (dcol > ocol + 1) { 143 tcol = (ocol + tabsize) / tabsize * tabsize; 144 while (tcol <= dcol) { 145 *dp++ = '\t'; 146 ocol = tcol; 147 tcol += tabsize; 148 } 149 } 150 while (ocol < dcol) { 151 *dp++ = ' '; 152 ocol++; 153 } 154 if (*cp == 0 || all == 0) { 155 strlcpy(dp, cp, 156 sizeof(linebuf) - (dp - linebuf)); 157 return; 158 } 159 *dp++ = *cp; 160 dcol = ++ocol; 161 } 162 cp++; 163 } 164 } 165