1 /* 2 * Copyright (c) 1980 The Regents of the University of California. 3 * 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 char copyright[] = 36 "@(#) Copyright (c) 1980 The Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)expand.c 5.3 (Berkeley) 6/1/90";*/ 42 static char rcsid[] = "$Id: expand.c,v 1.3 1993/08/28 02:34:04 jtc Exp $"; 43 #endif /* not lint */ 44 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <ctype.h> 48 49 /* 50 * expand - expand tabs to equivalent spaces 51 */ 52 int nstops; 53 int tabstops[100]; 54 55 static void getstops(); 56 static void usage(); 57 58 int 59 main(argc, argv) 60 int argc; 61 char *argv[]; 62 { 63 register int c, column; 64 register 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) % tabstops[0]) != (tabstops[0] - 1)); 110 continue; 111 } 112 for (n = 0; n < nstops; n++) 113 if (tabstops[n] > column) 114 break; 115 if (n == nstops) { 116 putchar(' '); 117 column++; 118 continue; 119 } 120 while (column < tabstops[n]) { 121 putchar(' '); 122 column++; 123 } 124 continue; 125 126 case '\b': 127 if (column) 128 column--; 129 putchar('\b'); 130 continue; 131 132 default: 133 putchar(c); 134 column++; 135 continue; 136 137 case '\n': 138 putchar(c); 139 column = 0; 140 continue; 141 } 142 } 143 } while (argc > 0); 144 exit(0); 145 } 146 147 static void 148 getstops(cp) 149 register char *cp; 150 { 151 register 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() 176 { 177 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 178 exit(1); 179 } 180