1 /* $OpenBSD: expand.c,v 1.11 2009/10/27 23:59:37 deraadt 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 #include <stdio.h> 34 #include <stdlib.h> 35 #include <ctype.h> 36 #include <unistd.h> 37 #include <err.h> 38 39 /* 40 * expand - expand tabs to equivalent spaces 41 */ 42 int nstops; 43 int tabstops[100]; 44 45 static void getstops(char *); 46 static void usage(void); 47 48 int 49 main(int argc, char *argv[]) 50 { 51 int c, column; 52 int n; 53 54 /* handle obsolete syntax */ 55 while (argc > 1 && argv[1][0] == '-' && isdigit(argv[1][1])) { 56 getstops(&argv[1][1]); 57 argc--; argv++; 58 } 59 60 while ((c = getopt (argc, argv, "t:")) != -1) { 61 switch (c) { 62 case 't': 63 getstops(optarg); 64 break; 65 case '?': 66 default: 67 usage(); 68 /* NOTREACHED */ 69 } 70 } 71 argc -= optind; 72 argv += optind; 73 74 do { 75 if (argc > 0) { 76 if (freopen(argv[0], "r", stdin) == NULL) 77 err(1, "%s", argv[0]); 78 argc--, argv++; 79 } 80 column = 0; 81 while ((c = getchar()) != EOF) { 82 switch (c) { 83 case '\t': 84 if (nstops == 0) { 85 do { 86 putchar(' '); 87 column++; 88 } while (column & 07); 89 continue; 90 } 91 if (nstops == 1) { 92 do { 93 putchar(' '); 94 column++; 95 } while (((column - 1) % 96 tabstops[0]) != (tabstops[0] - 1)); 97 continue; 98 } 99 for (n = 0; n < nstops; n++) 100 if (tabstops[n] > column) 101 break; 102 if (n == nstops) { 103 putchar(' '); 104 column++; 105 continue; 106 } 107 while (column < tabstops[n]) { 108 putchar(' '); 109 column++; 110 } 111 continue; 112 113 case '\b': 114 if (column) 115 column--; 116 putchar('\b'); 117 continue; 118 119 default: 120 putchar(c); 121 column++; 122 continue; 123 124 case '\n': 125 putchar(c); 126 column = 0; 127 continue; 128 } 129 } 130 } while (argc > 0); 131 exit(0); 132 } 133 134 static void 135 getstops(char *cp) 136 { 137 int i; 138 139 nstops = 0; 140 for (;;) { 141 i = 0; 142 while (*cp >= '0' && *cp <= '9') 143 i = i * 10 + *cp++ - '0'; 144 if (i <= 0 || i > 256) { 145 bad: 146 errx(1, "Bad tab stop spec"); 147 } 148 if (nstops > 0 && i <= tabstops[nstops-1]) 149 goto bad; 150 if (nstops >= sizeof(tabstops) / sizeof(tabstops[0])) 151 errx(1, "Too many tab stops"); 152 tabstops[nstops++] = i; 153 if (*cp == 0) 154 break; 155 if (*cp != ',' && *cp != ' ') 156 goto bad; 157 cp++; 158 } 159 } 160 161 static void 162 usage(void) 163 { 164 extern char *__progname; 165 fprintf (stderr, "usage: %s [-t tablist] [file ...]\n", __progname); 166 exit(1); 167 } 168