1 /* $OpenBSD: expand.c,v 1.10 2005/12/27 19:19:55 moritz Exp $ */ 2 /* $NetBSD: expand.c,v 1.5 1995/09/02 06:19:46 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1980, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static const char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93"; 42 #endif 43 static const char rcsid[] = "$OpenBSD: expand.c,v 1.10 2005/12/27 19:19:55 moritz Exp $"; 44 #endif /* not lint */ 45 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <ctype.h> 49 #include <unistd.h> 50 #include <err.h> 51 52 /* 53 * expand - expand tabs to equivalent spaces 54 */ 55 int nstops; 56 int tabstops[100]; 57 58 static void getstops(char *); 59 static void usage(void); 60 61 int 62 main(int argc, char *argv[]) 63 { 64 int c, column; 65 int n; 66 67 /* handle obsolete syntax */ 68 while (argc > 1 && argv[1][0] == '-' && isdigit(argv[1][1])) { 69 getstops(&argv[1][1]); 70 argc--; argv++; 71 } 72 73 while ((c = getopt (argc, argv, "t:")) != -1) { 74 switch (c) { 75 case 't': 76 getstops(optarg); 77 break; 78 case '?': 79 default: 80 usage(); 81 /* NOTREACHED */ 82 } 83 } 84 argc -= optind; 85 argv += optind; 86 87 do { 88 if (argc > 0) { 89 if (freopen(argv[0], "r", stdin) == NULL) 90 err(1, "%s", argv[0]); 91 argc--, argv++; 92 } 93 column = 0; 94 while ((c = getchar()) != EOF) { 95 switch (c) { 96 case '\t': 97 if (nstops == 0) { 98 do { 99 putchar(' '); 100 column++; 101 } while (column & 07); 102 continue; 103 } 104 if (nstops == 1) { 105 do { 106 putchar(' '); 107 column++; 108 } while (((column - 1) % 109 tabstops[0]) != (tabstops[0] - 1)); 110 continue; 111 } 112 for (n = 0; n < nstops; n++) 113 if (tabstops[n] > column) 114 break; 115 if (n == nstops) { 116 putchar(' '); 117 column++; 118 continue; 119 } 120 while (column < tabstops[n]) { 121 putchar(' '); 122 column++; 123 } 124 continue; 125 126 case '\b': 127 if (column) 128 column--; 129 putchar('\b'); 130 continue; 131 132 default: 133 putchar(c); 134 column++; 135 continue; 136 137 case '\n': 138 putchar(c); 139 column = 0; 140 continue; 141 } 142 } 143 } while (argc > 0); 144 exit(0); 145 } 146 147 static void 148 getstops(char *cp) 149 { 150 int i; 151 152 nstops = 0; 153 for (;;) { 154 i = 0; 155 while (*cp >= '0' && *cp <= '9') 156 i = i * 10 + *cp++ - '0'; 157 if (i <= 0 || i > 256) { 158 bad: 159 errx(1, "Bad tab stop spec"); 160 } 161 if (nstops > 0 && i <= tabstops[nstops-1]) 162 goto bad; 163 if (nstops >= sizeof(tabstops) / sizeof(tabstops[0])) 164 errx(1, "Too many tab stops"); 165 tabstops[nstops++] = i; 166 if (*cp == 0) 167 break; 168 if (*cp != ',' && *cp != ' ') 169 goto bad; 170 cp++; 171 } 172 } 173 174 static void 175 usage(void) 176 { 177 extern char *__progname; 178 fprintf (stderr, "usage: %s [-t tablist] [file ...]\n", __progname); 179 exit(1); 180 } 181