1 /* $OpenBSD: expand.c,v 1.14 2015/10/09 01:37:07 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 #include <stdio.h> 34 #include <stdlib.h> 35 #include <ctype.h> 36 #include <unistd.h> 37 #include <err.h> 38 39 /* 40 * expand - expand tabs to equivalent spaces 41 */ 42 int nstops; 43 int tabstops[100]; 44 45 static void getstops(char *); 46 static void usage(void); 47 48 int 49 main(int argc, char *argv[]) 50 { 51 int c, column; 52 int n; 53 54 if (pledge("stdio rpath", NULL) == -1) 55 err(1, "pledge"); 56 57 /* handle obsolete syntax */ 58 while (argc > 1 && argv[1][0] == '-' && 59 isdigit((unsigned char)argv[1][1])) { 60 getstops(&argv[1][1]); 61 argc--; argv++; 62 } 63 64 while ((c = getopt (argc, argv, "t:")) != -1) { 65 switch (c) { 66 case 't': 67 getstops(optarg); 68 break; 69 case '?': 70 default: 71 usage(); 72 /* NOTREACHED */ 73 } 74 } 75 argc -= optind; 76 argv += optind; 77 78 do { 79 if (argc > 0) { 80 if (freopen(argv[0], "r", stdin) == NULL) 81 err(1, "%s", argv[0]); 82 argc--, argv++; 83 } 84 column = 0; 85 while ((c = getchar()) != EOF) { 86 switch (c) { 87 case '\t': 88 if (nstops == 0) { 89 do { 90 putchar(' '); 91 column++; 92 } while (column & 07); 93 continue; 94 } 95 if (nstops == 1) { 96 do { 97 putchar(' '); 98 column++; 99 } while (((column - 1) % 100 tabstops[0]) != (tabstops[0] - 1)); 101 continue; 102 } 103 for (n = 0; n < nstops; n++) 104 if (tabstops[n] > column) 105 break; 106 if (n == nstops) { 107 putchar(' '); 108 column++; 109 continue; 110 } 111 while (column < tabstops[n]) { 112 putchar(' '); 113 column++; 114 } 115 continue; 116 117 case '\b': 118 if (column) 119 column--; 120 putchar('\b'); 121 continue; 122 123 default: 124 putchar(c); 125 column++; 126 continue; 127 128 case '\n': 129 putchar(c); 130 column = 0; 131 continue; 132 } 133 } 134 } while (argc > 0); 135 exit(0); 136 } 137 138 static void 139 getstops(char *cp) 140 { 141 int i; 142 143 nstops = 0; 144 for (;;) { 145 i = 0; 146 while (*cp >= '0' && *cp <= '9') 147 i = i * 10 + *cp++ - '0'; 148 if (i <= 0 || i > 256) { 149 bad: 150 errx(1, "Bad tab stop spec"); 151 } 152 if (nstops > 0 && i <= tabstops[nstops-1]) 153 goto bad; 154 if (nstops >= sizeof(tabstops) / sizeof(tabstops[0])) 155 errx(1, "Too many tab stops"); 156 tabstops[nstops++] = i; 157 if (*cp == 0) 158 break; 159 if (*cp != ',' && *cp != ' ') 160 goto bad; 161 cp++; 162 } 163 } 164 165 static void 166 usage(void) 167 { 168 extern char *__progname; 169 fprintf (stderr, "usage: %s [-t tablist] [file ...]\n", __progname); 170 exit(1); 171 } 172