1 /* $NetBSD: expand.c,v 1.7 1998/11/06 23:10:40 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93"; 45 #endif 46 __RCSID("$NetBSD: expand.c,v 1.7 1998/11/06 23:10:40 christos Exp $"); 47 #endif /* not lint */ 48 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <ctype.h> 52 #include <unistd.h> 53 54 /* 55 * expand - expand tabs to equivalent spaces 56 */ 57 int nstops; 58 int tabstops[100]; 59 60 static void getstops __P((char *)); 61 int main __P((int, char **)); 62 static void usage __P((void)); 63 64 int 65 main(argc, argv) 66 int argc; 67 char *argv[]; 68 { 69 int c, column; 70 int n; 71 72 /* handle obsolete syntax */ 73 while (argc > 1 && argv[1][0] && isdigit((unsigned char)argv[1][1])) { 74 getstops(&argv[1][1]); 75 argc--; argv++; 76 } 77 78 while ((c = getopt (argc, argv, "t:")) != -1) { 79 switch (c) { 80 case 't': 81 getstops(optarg); 82 break; 83 case '?': 84 default: 85 usage(); 86 /* NOTREACHED */ 87 } 88 } 89 argc -= optind; 90 argv += optind; 91 92 do { 93 if (argc > 0) { 94 if (freopen(argv[0], "r", stdin) == NULL) { 95 perror(argv[0]); 96 exit(1); 97 } 98 argc--, argv++; 99 } 100 column = 0; 101 while ((c = getchar()) != EOF) { 102 switch (c) { 103 case '\t': 104 if (nstops == 0) { 105 do { 106 putchar(' '); 107 column++; 108 } while (column & 07); 109 continue; 110 } 111 if (nstops == 1) { 112 do { 113 putchar(' '); 114 column++; 115 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 116 continue; 117 } 118 for (n = 0; n < nstops; n++) 119 if (tabstops[n] > column) 120 break; 121 if (n == nstops) { 122 putchar(' '); 123 column++; 124 continue; 125 } 126 while (column < tabstops[n]) { 127 putchar(' '); 128 column++; 129 } 130 continue; 131 132 case '\b': 133 if (column) 134 column--; 135 putchar('\b'); 136 continue; 137 138 default: 139 putchar(c); 140 column++; 141 continue; 142 143 case '\n': 144 putchar(c); 145 column = 0; 146 continue; 147 } 148 } 149 } while (argc > 0); 150 exit(0); 151 } 152 153 static void 154 getstops(cp) 155 char *cp; 156 { 157 int i; 158 159 nstops = 0; 160 for (;;) { 161 i = 0; 162 while (*cp >= '0' && *cp <= '9') 163 i = i * 10 + *cp++ - '0'; 164 if (i <= 0 || i > 256) { 165 bad: 166 fprintf(stderr, "Bad tab stop spec\n"); 167 exit(1); 168 } 169 if (nstops > 0 && i <= tabstops[nstops-1]) 170 goto bad; 171 tabstops[nstops++] = i; 172 if (*cp == 0) 173 break; 174 if (*cp != ',' && *cp != ' ') 175 goto bad; 176 cp++; 177 } 178 } 179 180 static void 181 usage() 182 { 183 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 184 exit(1); 185 } 186