1 /* $OpenBSD: expand.c,v 1.7 2003/07/03 03:09:39 deraadt Exp $ */ 2 /* $NetBSD: expand.c,v 1.5 1995/09/02 06:19:46 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static char copyright[] = 35 "@(#) Copyright (c) 1980, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93"; 42 #endif 43 static char rcsid[] = "$OpenBSD: expand.c,v 1.7 2003/07/03 03:09:39 deraadt Exp $"; 44 #endif /* not lint */ 45 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <ctype.h> 49 #include <unistd.h> 50 51 /* 52 * expand - expand tabs to equivalent spaces 53 */ 54 int nstops; 55 int tabstops[100]; 56 57 static void getstops(char *); 58 static void usage(void); 59 60 int 61 main(int argc, char *argv[]) 62 { 63 int c, column; 64 int n; 65 66 /* handle obsolete syntax */ 67 while (argc > 1 && argv[1][0] == '-' && isdigit(argv[1][1])) { 68 getstops(&argv[1][1]); 69 argc--; argv++; 70 } 71 72 while ((c = getopt (argc, argv, "t:")) != -1) { 73 switch (c) { 74 case 't': 75 getstops(optarg); 76 break; 77 case '?': 78 default: 79 usage(); 80 /* NOTREACHED */ 81 } 82 } 83 argc -= optind; 84 argv += optind; 85 86 do { 87 if (argc > 0) { 88 if (freopen(argv[0], "r", stdin) == NULL) { 89 perror(argv[0]); 90 exit(1); 91 } 92 argc--, argv++; 93 } 94 column = 0; 95 while ((c = getchar()) != EOF) { 96 switch (c) { 97 case '\t': 98 if (nstops == 0) { 99 do { 100 putchar(' '); 101 column++; 102 } while (column & 07); 103 continue; 104 } 105 if (nstops == 1) { 106 do { 107 putchar(' '); 108 column++; 109 } while (((column - 1) % 110 tabstops[0]) != (tabstops[0] - 1)); 111 continue; 112 } 113 for (n = 0; n < nstops; n++) 114 if (tabstops[n] > column) 115 break; 116 if (n == nstops) { 117 putchar(' '); 118 column++; 119 continue; 120 } 121 while (column < tabstops[n]) { 122 putchar(' '); 123 column++; 124 } 125 continue; 126 127 case '\b': 128 if (column) 129 column--; 130 putchar('\b'); 131 continue; 132 133 default: 134 putchar(c); 135 column++; 136 continue; 137 138 case '\n': 139 putchar(c); 140 column = 0; 141 continue; 142 } 143 } 144 } while (argc > 0); 145 exit(0); 146 } 147 148 static void 149 getstops(char *cp) 150 { 151 int i; 152 153 nstops = 0; 154 for (;;) { 155 i = 0; 156 while (*cp >= '0' && *cp <= '9') 157 i = i * 10 + *cp++ - '0'; 158 if (i <= 0 || i > 256) { 159 bad: 160 fprintf(stderr, "Bad tab stop spec\n"); 161 exit(1); 162 } 163 if (nstops > 0 && i <= tabstops[nstops-1]) 164 goto bad; 165 tabstops[nstops++] = i; 166 if (*cp == 0) 167 break; 168 if (*cp != ',' && *cp != ' ') 169 goto bad; 170 cp++; 171 } 172 } 173 174 static void 175 usage(void) 176 { 177 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 178 exit(1); 179 } 180