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 #else 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif 47 #endif /* not lint */ 48 49 #include <ctype.h> 50 #include <stdio.h> 51 #include <stdlib.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 static void usage __P((void)); 62 63 int 64 main(argc, argv) 65 int argc; 66 char *argv[]; 67 { 68 register int c, column; 69 register int n; 70 71 /* handle obsolete syntax */ 72 while (argc > 1 && argv[1][0] == '-' && isdigit(argv[1][1])) { 73 getstops(&argv[1][1]); 74 argc--; argv++; 75 } 76 77 while ((c = getopt (argc, argv, "t:")) != -1) { 78 switch (c) { 79 case 't': 80 getstops(optarg); 81 break; 82 case '?': 83 default: 84 usage(); 85 /* NOTREACHED */ 86 } 87 } 88 argc -= optind; 89 argv += optind; 90 91 do { 92 if (argc > 0) { 93 if (freopen(argv[0], "r", stdin) == NULL) { 94 perror(argv[0]); 95 exit(1); 96 } 97 argc--, argv++; 98 } 99 column = 0; 100 while ((c = getchar()) != EOF) { 101 switch (c) { 102 case '\t': 103 if (nstops == 0) { 104 do { 105 putchar(' '); 106 column++; 107 } while (column & 07); 108 continue; 109 } 110 if (nstops == 1) { 111 do { 112 putchar(' '); 113 column++; 114 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 115 continue; 116 } 117 for (n = 0; n < nstops; n++) 118 if (tabstops[n] > column) 119 break; 120 if (n == nstops) { 121 putchar(' '); 122 column++; 123 continue; 124 } 125 while (column < tabstops[n]) { 126 putchar(' '); 127 column++; 128 } 129 continue; 130 131 case '\b': 132 if (column) 133 column--; 134 putchar('\b'); 135 continue; 136 137 default: 138 putchar(c); 139 column++; 140 continue; 141 142 case '\n': 143 putchar(c); 144 column = 0; 145 continue; 146 } 147 } 148 } while (argc > 0); 149 exit(0); 150 } 151 152 static void 153 getstops(cp) 154 register char *cp; 155 { 156 register int i; 157 158 nstops = 0; 159 for (;;) { 160 i = 0; 161 while (*cp >= '0' && *cp <= '9') 162 i = i * 10 + *cp++ - '0'; 163 if (i <= 0 || i > 256) { 164 bad: 165 fprintf(stderr, "Bad tab stop spec\n"); 166 exit(1); 167 } 168 if (nstops > 0 && i <= tabstops[nstops-1]) 169 goto bad; 170 tabstops[nstops++] = i; 171 if (*cp == 0) 172 break; 173 if (*cp != ',' && *cp != ' ') 174 goto bad; 175 cp++; 176 } 177 } 178 179 static void 180 usage() 181 { 182 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 183 exit(1); 184 } 185