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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1980, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)expand.c 8.1 (Berkeley) 6/9/93 31 * $FreeBSD: src/usr.bin/expand/expand.c,v 1.5.2.6 2002/07/09 10:47:59 tjr Exp $ 32 * $DragonFly: src/usr.bin/expand/expand.c,v 1.4 2005/04/10 20:55:38 drhodus Exp $ 33 */ 34 35 #include <ctype.h> 36 #include <err.h> 37 #include <locale.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <unistd.h> 41 42 /* 43 * expand - expand tabs to equivalent spaces 44 */ 45 int nstops; 46 int tabstops[100]; 47 48 static void getstops(char *); 49 static void usage(void); 50 51 int 52 main(int argc, char **argv) 53 { 54 int c, column; 55 int n; 56 int rval; 57 58 setlocale(LC_CTYPE, ""); 59 60 /* handle obsolete syntax */ 61 while (argc > 1 && argv[1][0] == '-' && 62 isdigit((unsigned char)argv[1][1])) { 63 getstops(&argv[1][1]); 64 argc--; argv++; 65 } 66 67 while ((c = getopt (argc, argv, "t:")) != -1) { 68 switch (c) { 69 case 't': 70 getstops(optarg); 71 break; 72 case '?': 73 default: 74 usage(); 75 /* NOTREACHED */ 76 } 77 } 78 argc -= optind; 79 argv += optind; 80 81 rval = 0; 82 do { 83 if (argc > 0) { 84 if (freopen(argv[0], "r", stdin) == NULL) { 85 warn("%s", argv[0]); 86 rval = 1; 87 argc--, argv++; 88 continue; 89 } 90 argc--, argv++; 91 } 92 column = 0; 93 while ((c = getchar()) != EOF) { 94 switch (c) { 95 case '\t': 96 if (nstops == 0) { 97 do { 98 putchar(' '); 99 column++; 100 } while (column & 07); 101 continue; 102 } 103 if (nstops == 1) { 104 do { 105 putchar(' '); 106 column++; 107 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 108 continue; 109 } 110 for (n = 0; n < nstops; n++) 111 if (tabstops[n] > column) 112 break; 113 if (n == nstops) { 114 putchar(' '); 115 column++; 116 continue; 117 } 118 while (column < tabstops[n]) { 119 putchar(' '); 120 column++; 121 } 122 continue; 123 124 case '\b': 125 if (column) 126 column--; 127 putchar('\b'); 128 continue; 129 130 default: 131 putchar(c); 132 if (isprint(c)) 133 column++; 134 continue; 135 136 case '\n': 137 putchar(c); 138 column = 0; 139 continue; 140 } 141 } 142 } while (argc > 0); 143 exit(rval); 144 } 145 146 static void 147 getstops(char *cp) 148 { 149 int i; 150 151 nstops = 0; 152 for (;;) { 153 i = 0; 154 while (*cp >= '0' && *cp <= '9') 155 i = i * 10 + *cp++ - '0'; 156 if (i <= 0) 157 errx(1, "bad tab stop spec"); 158 if (nstops > 0 && i <= tabstops[nstops-1]) 159 errx(1, "bad tab stop spec"); 160 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 161 errx(1, "too many tab stops"); 162 tabstops[nstops++] = i; 163 if (*cp == 0) 164 break; 165 if (*cp != ',' && !isblank((unsigned char)*cp)) 166 errx(1, "bad tab stop spec"); 167 cp++; 168 } 169 } 170 171 static void 172 usage(void) 173 { 174 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 175 exit(1); 176 } 177