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 1.3 2003/10/04 20:36:44 hmp 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(int argc, char **argv) 57 { 58 register int c, column; 59 register int n; 60 int rval; 61 62 setlocale(LC_CTYPE, ""); 63 64 /* handle obsolete syntax */ 65 while (argc > 1 && argv[1][0] == '-' && 66 isdigit((unsigned char)argv[1][1])) { 67 getstops(&argv[1][1]); 68 argc--; argv++; 69 } 70 71 while ((c = getopt (argc, argv, "t:")) != -1) { 72 switch (c) { 73 case 't': 74 getstops(optarg); 75 break; 76 case '?': 77 default: 78 usage(); 79 /* NOTREACHED */ 80 } 81 } 82 argc -= optind; 83 argv += optind; 84 85 rval = 0; 86 do { 87 if (argc > 0) { 88 if (freopen(argv[0], "r", stdin) == NULL) { 89 warn("%s", argv[0]); 90 rval = 1; 91 argc--, argv++; 92 continue; 93 } 94 argc--, argv++; 95 } 96 column = 0; 97 while ((c = getchar()) != EOF) { 98 switch (c) { 99 case '\t': 100 if (nstops == 0) { 101 do { 102 putchar(' '); 103 column++; 104 } while (column & 07); 105 continue; 106 } 107 if (nstops == 1) { 108 do { 109 putchar(' '); 110 column++; 111 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 112 continue; 113 } 114 for (n = 0; n < nstops; n++) 115 if (tabstops[n] > column) 116 break; 117 if (n == nstops) { 118 putchar(' '); 119 column++; 120 continue; 121 } 122 while (column < tabstops[n]) { 123 putchar(' '); 124 column++; 125 } 126 continue; 127 128 case '\b': 129 if (column) 130 column--; 131 putchar('\b'); 132 continue; 133 134 default: 135 putchar(c); 136 if (isprint(c)) 137 column++; 138 continue; 139 140 case '\n': 141 putchar(c); 142 column = 0; 143 continue; 144 } 145 } 146 } while (argc > 0); 147 exit(rval); 148 } 149 150 static void 151 getstops(register char *cp) 152 { 153 register int i; 154 155 nstops = 0; 156 for (;;) { 157 i = 0; 158 while (*cp >= '0' && *cp <= '9') 159 i = i * 10 + *cp++ - '0'; 160 if (i <= 0) 161 errx(1, "bad tab stop spec"); 162 if (nstops > 0 && i <= tabstops[nstops-1]) 163 errx(1, "bad tab stop spec"); 164 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 165 errx(1, "too many tab stops"); 166 tabstops[nstops++] = i; 167 if (*cp == 0) 168 break; 169 if (*cp != ',' && !isblank((unsigned char)*cp)) 170 errx(1, "bad tab stop spec"); 171 cp++; 172 } 173 } 174 175 static void 176 usage(void) 177 { 178 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 179 exit(1); 180 } 181