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 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 #include <ctype.h> 49 #include <err.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 errx(1, "%s", argv[0]); 95 argc--, argv++; 96 } 97 column = 0; 98 while ((c = getchar()) != EOF) { 99 switch (c) { 100 case '\t': 101 if (nstops == 0) { 102 do { 103 putchar(' '); 104 column++; 105 } while (column & 07); 106 continue; 107 } 108 if (nstops == 1) { 109 do { 110 putchar(' '); 111 column++; 112 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 113 continue; 114 } 115 for (n = 0; n < nstops; n++) 116 if (tabstops[n] > column) 117 break; 118 if (n == nstops) { 119 putchar(' '); 120 column++; 121 continue; 122 } 123 while (column < tabstops[n]) { 124 putchar(' '); 125 column++; 126 } 127 continue; 128 129 case '\b': 130 if (column) 131 column--; 132 putchar('\b'); 133 continue; 134 135 default: 136 putchar(c); 137 column++; 138 continue; 139 140 case '\n': 141 putchar(c); 142 column = 0; 143 continue; 144 } 145 } 146 } while (argc > 0); 147 exit(0); 148 } 149 150 static void 151 getstops(cp) 152 register char *cp; 153 { 154 register int i; 155 156 nstops = 0; 157 for (;;) { 158 i = 0; 159 while (*cp >= '0' && *cp <= '9') 160 i = i * 10 + *cp++ - '0'; 161 if (i <= 0) 162 errx(1, "bad tab stop spec"); 163 if (nstops > 0 && i <= tabstops[nstops-1]) 164 errx(1, "bad tab stop spec"); 165 tabstops[nstops++] = i; 166 if (*cp == 0) 167 break; 168 if (*cp != ',' && *cp != ' ') 169 errx(1, "bad tab stop spec"); 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