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 #include <ctype.h> 45 #include <err.h> 46 #include <locale.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 #include <wchar.h> 51 #include <wctype.h> 52 53 /* 54 * expand - expand tabs to equivalent spaces 55 */ 56 static int nstops; 57 static int tabstops[100]; 58 59 static void getstops(char *); 60 static void usage(void) __dead2; 61 62 int 63 main(int argc, char *argv[]) 64 { 65 const char *curfile; 66 wint_t wc; 67 int c, column; 68 int n; 69 int rval; 70 int width; 71 72 setlocale(LC_CTYPE, ""); 73 74 /* handle obsolete syntax */ 75 while (argc > 1 && argv[1][0] == '-' && 76 isdigit((unsigned char)argv[1][1])) { 77 getstops(&argv[1][1]); 78 argc--; argv++; 79 } 80 81 while ((c = getopt (argc, argv, "t:")) != -1) { 82 switch (c) { 83 case 't': 84 getstops(optarg); 85 break; 86 case '?': 87 default: 88 usage(); 89 /* NOTREACHED */ 90 } 91 } 92 argc -= optind; 93 argv += optind; 94 95 rval = 0; 96 do { 97 if (argc > 0) { 98 if (freopen(argv[0], "r", stdin) == NULL) { 99 warn("%s", argv[0]); 100 rval = 1; 101 argc--, argv++; 102 continue; 103 } 104 curfile = argv[0]; 105 argc--, argv++; 106 } else 107 curfile = "stdin"; 108 column = 0; 109 while ((wc = getwchar()) != WEOF) { 110 switch (wc) { 111 case '\t': 112 if (nstops == 0) { 113 do { 114 putwchar(' '); 115 column++; 116 } while (column & 07); 117 continue; 118 } 119 if (nstops == 1) { 120 do { 121 putwchar(' '); 122 column++; 123 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 124 continue; 125 } 126 for (n = 0; n < nstops; n++) 127 if (tabstops[n] > column) 128 break; 129 if (n == nstops) { 130 putwchar(' '); 131 column++; 132 continue; 133 } 134 while (column < tabstops[n]) { 135 putwchar(' '); 136 column++; 137 } 138 continue; 139 140 case '\b': 141 if (column) 142 column--; 143 putwchar('\b'); 144 continue; 145 146 default: 147 putwchar(wc); 148 if ((width = wcwidth(wc)) > 0) 149 column += width; 150 continue; 151 152 case '\n': 153 putwchar(wc); 154 column = 0; 155 continue; 156 } 157 } 158 if (ferror(stdin)) { 159 warn("%s", curfile); 160 rval = 1; 161 } 162 } while (argc > 0); 163 exit(rval); 164 } 165 166 static void 167 getstops(char *cp) 168 { 169 int i; 170 171 nstops = 0; 172 for (;;) { 173 i = 0; 174 while (*cp >= '0' && *cp <= '9') 175 i = i * 10 + *cp++ - '0'; 176 if (i <= 0) 177 errx(1, "bad tab stop spec"); 178 if (nstops > 0 && i <= tabstops[nstops-1]) 179 errx(1, "bad tab stop spec"); 180 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 181 errx(1, "too many tab stops"); 182 tabstops[nstops++] = i; 183 if (*cp == 0) 184 break; 185 if (*cp != ',' && !isblank((unsigned char)*cp)) 186 errx(1, "bad tab stop spec"); 187 cp++; 188 } 189 } 190 191 static void 192 usage(void) 193 { 194 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 195 exit(1); 196 } 197