1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <ctype.h> 33 #include <err.h> 34 #include <locale.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <unistd.h> 38 #include <wchar.h> 39 #include <wctype.h> 40 41 /* 42 * expand - expand tabs to equivalent spaces 43 */ 44 static int nstops; 45 static int tabstops[100]; 46 47 static void getstops(char *); 48 static void usage(void) __dead2; 49 50 int 51 main(int argc, char *argv[]) 52 { 53 const char *curfile; 54 wint_t wc; 55 int c, column; 56 int n; 57 int rval; 58 int width; 59 60 setlocale(LC_CTYPE, ""); 61 62 /* handle obsolete syntax */ 63 while (argc > 1 && argv[1][0] == '-' && 64 isdigit((unsigned char)argv[1][1])) { 65 getstops(&argv[1][1]); 66 argc--; argv++; 67 } 68 69 while ((c = getopt (argc, argv, "t:")) != -1) { 70 switch (c) { 71 case 't': 72 getstops(optarg); 73 break; 74 case '?': 75 default: 76 usage(); 77 /* NOTREACHED */ 78 } 79 } 80 argc -= optind; 81 argv += optind; 82 83 rval = 0; 84 do { 85 if (argc > 0) { 86 if (freopen(argv[0], "r", stdin) == NULL) { 87 warn("%s", argv[0]); 88 rval = 1; 89 argc--, argv++; 90 continue; 91 } 92 curfile = argv[0]; 93 argc--, argv++; 94 } else 95 curfile = "stdin"; 96 column = 0; 97 while ((wc = getwchar()) != WEOF) { 98 switch (wc) { 99 case '\t': 100 if (nstops == 0) { 101 do { 102 putwchar(' '); 103 column++; 104 } while (column & 07); 105 continue; 106 } 107 if (nstops == 1) { 108 do { 109 putwchar(' '); 110 column++; 111 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 112 continue; 113 } 114 for (n = 0; n < nstops; n++) 115 if (tabstops[n] > column) 116 break; 117 if (n == nstops) { 118 putwchar(' '); 119 column++; 120 continue; 121 } 122 while (column < tabstops[n]) { 123 putwchar(' '); 124 column++; 125 } 126 continue; 127 128 case '\b': 129 if (column) 130 column--; 131 putwchar('\b'); 132 continue; 133 134 default: 135 putwchar(wc); 136 if ((width = wcwidth(wc)) > 0) 137 column += width; 138 continue; 139 140 case '\n': 141 putwchar(wc); 142 column = 0; 143 continue; 144 } 145 } 146 if (ferror(stdin)) { 147 warn("%s", curfile); 148 rval = 1; 149 } 150 } while (argc > 0); 151 exit(rval); 152 } 153 154 static void 155 getstops(char *cp) 156 { 157 int i; 158 159 nstops = 0; 160 for (;;) { 161 i = 0; 162 while (*cp >= '0' && *cp <= '9') 163 i = i * 10 + *cp++ - '0'; 164 if (i <= 0) 165 errx(1, "bad tab stop spec"); 166 if (nstops > 0 && i <= tabstops[nstops-1]) 167 errx(1, "bad tab stop spec"); 168 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 169 errx(1, "too many tab stops"); 170 tabstops[nstops++] = i; 171 if (*cp == 0) 172 break; 173 if (*cp != ',' && !isblank((unsigned char)*cp)) 174 errx(1, "bad tab stop spec"); 175 cp++; 176 } 177 } 178 179 static void 180 usage(void) 181 { 182 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 183 exit(1); 184 } 185