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 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1980, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93"; 41 #endif 42 #endif /* not lint */ 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <ctype.h> 47 #include <err.h> 48 #include <locale.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <unistd.h> 52 #include <wchar.h> 53 #include <wctype.h> 54 55 /* 56 * expand - expand tabs to equivalent spaces 57 */ 58 static int nstops; 59 static int tabstops[100]; 60 61 static void getstops(char *); 62 static void usage(void); 63 64 int 65 main(int argc, char *argv[]) 66 { 67 const char *curfile; 68 wint_t wc; 69 int c, column; 70 int n; 71 int rval; 72 int width; 73 74 setlocale(LC_CTYPE, ""); 75 76 /* handle obsolete syntax */ 77 while (argc > 1 && argv[1][0] == '-' && 78 isdigit((unsigned char)argv[1][1])) { 79 getstops(&argv[1][1]); 80 argc--; argv++; 81 } 82 83 while ((c = getopt (argc, argv, "t:")) != -1) { 84 switch (c) { 85 case 't': 86 getstops(optarg); 87 break; 88 case '?': 89 default: 90 usage(); 91 /* NOTREACHED */ 92 } 93 } 94 argc -= optind; 95 argv += optind; 96 97 rval = 0; 98 do { 99 if (argc > 0) { 100 if (freopen(argv[0], "r", stdin) == NULL) { 101 warn("%s", argv[0]); 102 rval = 1; 103 argc--, argv++; 104 continue; 105 } 106 curfile = argv[0]; 107 argc--, argv++; 108 } else 109 curfile = "stdin"; 110 column = 0; 111 while ((wc = getwchar()) != WEOF) { 112 switch (wc) { 113 case '\t': 114 if (nstops == 0) { 115 do { 116 putwchar(' '); 117 column++; 118 } while (column & 07); 119 continue; 120 } 121 if (nstops == 1) { 122 do { 123 putwchar(' '); 124 column++; 125 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 126 continue; 127 } 128 for (n = 0; n < nstops; n++) 129 if (tabstops[n] > column) 130 break; 131 if (n == nstops) { 132 putwchar(' '); 133 column++; 134 continue; 135 } 136 while (column < tabstops[n]) { 137 putwchar(' '); 138 column++; 139 } 140 continue; 141 142 case '\b': 143 if (column) 144 column--; 145 putwchar('\b'); 146 continue; 147 148 default: 149 putwchar(wc); 150 if ((width = wcwidth(wc)) > 0) 151 column += width; 152 continue; 153 154 case '\n': 155 putwchar(wc); 156 column = 0; 157 continue; 158 } 159 } 160 if (ferror(stdin)) { 161 warn("%s", curfile); 162 rval = 1; 163 } 164 } while (argc > 0); 165 exit(rval); 166 } 167 168 static void 169 getstops(char *cp) 170 { 171 int i; 172 173 nstops = 0; 174 for (;;) { 175 i = 0; 176 while (*cp >= '0' && *cp <= '9') 177 i = i * 10 + *cp++ - '0'; 178 if (i <= 0) 179 errx(1, "bad tab stop spec"); 180 if (nstops > 0 && i <= tabstops[nstops-1]) 181 errx(1, "bad tab stop spec"); 182 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 183 errx(1, "too many tab stops"); 184 tabstops[nstops++] = i; 185 if (*cp == 0) 186 break; 187 if (*cp != ',' && !isblank((unsigned char)*cp)) 188 errx(1, "bad tab stop spec"); 189 cp++; 190 } 191 } 192 193 static void 194 usage(void) 195 { 196 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 197 exit(1); 198 } 199