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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1980, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)expand.c 8.1 (Berkeley) 6/9/93 31 * $FreeBSD: head/usr.bin/expand/expand.c 227238 2011-11-06 18:49:30Z ed $ 32 */ 33 34 #include <ctype.h> 35 #include <err.h> 36 #include <locale.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <unistd.h> 40 #include <wchar.h> 41 #include <wctype.h> 42 43 /* 44 * expand - expand tabs to equivalent spaces 45 */ 46 static int nstops; 47 static int tabstops[100]; 48 49 static void getstops(char *); 50 static void usage(void); 51 52 int 53 main(int argc, char *argv[]) 54 { 55 const char *curfile; 56 wint_t wc; 57 int c, column; 58 int n; 59 int rval; 60 int width; 61 62 setlocale(LC_CTYPE, ""); 63 64 /* handle obsolete syntax */ 65 while (argc > 1 && argv[1][0] == '-' && 66 isdigit((unsigned char)argv[1][1])) { 67 getstops(&argv[1][1]); 68 argc--; argv++; 69 } 70 71 while ((c = getopt (argc, argv, "t:")) != -1) { 72 switch (c) { 73 case 't': 74 getstops(optarg); 75 break; 76 case '?': 77 default: 78 usage(); 79 /* NOTREACHED */ 80 } 81 } 82 argc -= optind; 83 argv += optind; 84 85 rval = 0; 86 do { 87 if (argc > 0) { 88 if (freopen(argv[0], "r", stdin) == NULL) { 89 warn("%s", argv[0]); 90 rval = 1; 91 argc--, argv++; 92 continue; 93 } 94 curfile = argv[0]; 95 argc--, argv++; 96 } else 97 curfile = "stdin"; 98 column = 0; 99 while ((wc = getwchar()) != WEOF) { 100 switch (wc) { 101 case '\t': 102 if (nstops == 0) { 103 do { 104 putwchar(' '); 105 column++; 106 } while (column & 07); 107 continue; 108 } 109 if (nstops == 1) { 110 do { 111 putwchar(' '); 112 column++; 113 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 114 continue; 115 } 116 for (n = 0; n < nstops; n++) 117 if (tabstops[n] > column) 118 break; 119 if (n == nstops) { 120 putwchar(' '); 121 column++; 122 continue; 123 } 124 while (column < tabstops[n]) { 125 putwchar(' '); 126 column++; 127 } 128 continue; 129 130 case '\b': 131 if (column) 132 column--; 133 putwchar('\b'); 134 continue; 135 136 default: 137 putwchar(wc); 138 if ((width = wcwidth(wc)) > 0) 139 column += width; 140 continue; 141 142 case '\n': 143 putwchar(wc); 144 column = 0; 145 continue; 146 } 147 } 148 if (ferror(stdin)) { 149 warn("%s", curfile); 150 rval = 1; 151 } 152 } while (argc > 0); 153 exit(rval); 154 } 155 156 static void 157 getstops(char *cp) 158 { 159 int i; 160 161 nstops = 0; 162 for (;;) { 163 i = 0; 164 while (*cp >= '0' && *cp <= '9') 165 i = i * 10 + *cp++ - '0'; 166 if (i <= 0) 167 errx(1, "bad tab stop spec"); 168 if (nstops > 0 && i <= tabstops[nstops-1]) 169 errx(1, "bad tab stop spec"); 170 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 171 errx(1, "too many tab stops"); 172 tabstops[nstops++] = i; 173 if (*cp == 0) 174 break; 175 if (*cp != ',' && !isblank((unsigned char)*cp)) 176 errx(1, "bad tab stop spec"); 177 cp++; 178 } 179 } 180 181 static void 182 usage(void) 183 { 184 fprintf(stderr, "usage: expand [-t tablist] [file ...]\n"); 185 exit(1); 186 } 187