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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1980, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93"; 43 #endif 44 #endif /* not lint */ 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD: src/usr.bin/expand/expand.c,v 1.5.2.6 2002/07/09 10:47:59 tjr Exp $"); 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <locale.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <unistd.h> 54 55 /* 56 * expand - expand tabs to equivalent spaces 57 */ 58 int nstops; 59 int tabstops[100]; 60 61 static void getstops(char *); 62 static void usage(void); 63 64 int 65 main(argc, argv) 66 int argc; 67 char *argv[]; 68 { 69 register int c, column; 70 register int n; 71 int rval; 72 73 setlocale(LC_CTYPE, ""); 74 75 /* handle obsolete syntax */ 76 while (argc > 1 && argv[1][0] == '-' && 77 isdigit((unsigned char)argv[1][1])) { 78 getstops(&argv[1][1]); 79 argc--; argv++; 80 } 81 82 while ((c = getopt (argc, argv, "t:")) != -1) { 83 switch (c) { 84 case 't': 85 getstops(optarg); 86 break; 87 case '?': 88 default: 89 usage(); 90 /* NOTREACHED */ 91 } 92 } 93 argc -= optind; 94 argv += optind; 95 96 rval = 0; 97 do { 98 if (argc > 0) { 99 if (freopen(argv[0], "r", stdin) == NULL) { 100 warn("%s", argv[0]); 101 rval = 1; 102 argc--, argv++; 103 continue; 104 } 105 argc--, argv++; 106 } 107 column = 0; 108 while ((c = getchar()) != EOF) { 109 switch (c) { 110 case '\t': 111 if (nstops == 0) { 112 do { 113 putchar(' '); 114 column++; 115 } while (column & 07); 116 continue; 117 } 118 if (nstops == 1) { 119 do { 120 putchar(' '); 121 column++; 122 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 123 continue; 124 } 125 for (n = 0; n < nstops; n++) 126 if (tabstops[n] > column) 127 break; 128 if (n == nstops) { 129 putchar(' '); 130 column++; 131 continue; 132 } 133 while (column < tabstops[n]) { 134 putchar(' '); 135 column++; 136 } 137 continue; 138 139 case '\b': 140 if (column) 141 column--; 142 putchar('\b'); 143 continue; 144 145 default: 146 putchar(c); 147 if (isprint(c)) 148 column++; 149 continue; 150 151 case '\n': 152 putchar(c); 153 column = 0; 154 continue; 155 } 156 } 157 } while (argc > 0); 158 exit(rval); 159 } 160 161 static void 162 getstops(cp) 163 register char *cp; 164 { 165 register int i; 166 167 nstops = 0; 168 for (;;) { 169 i = 0; 170 while (*cp >= '0' && *cp <= '9') 171 i = i * 10 + *cp++ - '0'; 172 if (i <= 0) 173 errx(1, "bad tab stop spec"); 174 if (nstops > 0 && i <= tabstops[nstops-1]) 175 errx(1, "bad tab stop spec"); 176 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 177 errx(1, "too many tab stops"); 178 tabstops[nstops++] = i; 179 if (*cp == 0) 180 break; 181 if (*cp != ',' && !isblank((unsigned char)*cp)) 182 errx(1, "bad tab stop spec"); 183 cp++; 184 } 185 } 186 187 static void 188 usage() 189 { 190 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 191 exit(1); 192 } 193