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 * @(#) Copyright (c) 1980, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)expand.c 8.1 (Berkeley) 6/9/93 35 * $FreeBSD: src/usr.bin/expand/expand.c,v 1.5.2.6 2002/07/09 10:47:59 tjr Exp $ 36 * $DragonFly: src/usr.bin/expand/expand.c,v 1.2 2003/06/17 04:29:26 dillon Exp $ 37 */ 38 39 #include <ctype.h> 40 #include <err.h> 41 #include <locale.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 46 /* 47 * expand - expand tabs to equivalent spaces 48 */ 49 int nstops; 50 int tabstops[100]; 51 52 static void getstops(char *); 53 static void usage(void); 54 55 int 56 main(argc, argv) 57 int argc; 58 char *argv[]; 59 { 60 register int c, column; 61 register int n; 62 int rval; 63 64 setlocale(LC_CTYPE, ""); 65 66 /* handle obsolete syntax */ 67 while (argc > 1 && argv[1][0] == '-' && 68 isdigit((unsigned char)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 rval = 0; 88 do { 89 if (argc > 0) { 90 if (freopen(argv[0], "r", stdin) == NULL) { 91 warn("%s", argv[0]); 92 rval = 1; 93 argc--, argv++; 94 continue; 95 } 96 argc--, argv++; 97 } 98 column = 0; 99 while ((c = getchar()) != EOF) { 100 switch (c) { 101 case '\t': 102 if (nstops == 0) { 103 do { 104 putchar(' '); 105 column++; 106 } while (column & 07); 107 continue; 108 } 109 if (nstops == 1) { 110 do { 111 putchar(' '); 112 column++; 113 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 114 continue; 115 } 116 for (n = 0; n < nstops; n++) 117 if (tabstops[n] > column) 118 break; 119 if (n == nstops) { 120 putchar(' '); 121 column++; 122 continue; 123 } 124 while (column < tabstops[n]) { 125 putchar(' '); 126 column++; 127 } 128 continue; 129 130 case '\b': 131 if (column) 132 column--; 133 putchar('\b'); 134 continue; 135 136 default: 137 putchar(c); 138 if (isprint(c)) 139 column++; 140 continue; 141 142 case '\n': 143 putchar(c); 144 column = 0; 145 continue; 146 } 147 } 148 } while (argc > 0); 149 exit(rval); 150 } 151 152 static void 153 getstops(cp) 154 register char *cp; 155 { 156 register int i; 157 158 nstops = 0; 159 for (;;) { 160 i = 0; 161 while (*cp >= '0' && *cp <= '9') 162 i = i * 10 + *cp++ - '0'; 163 if (i <= 0) 164 errx(1, "bad tab stop spec"); 165 if (nstops > 0 && i <= tabstops[nstops-1]) 166 errx(1, "bad tab stop spec"); 167 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 168 errx(1, "too many tab stops"); 169 tabstops[nstops++] = i; 170 if (*cp == 0) 171 break; 172 if (*cp != ',' && !isblank((unsigned char)*cp)) 173 errx(1, "bad tab stop spec"); 174 cp++; 175 } 176 } 177 178 static void 179 usage() 180 { 181 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 182 exit(1); 183 } 184