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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1980, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93"; 43 #endif 44 #endif /* not lint */ 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <locale.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <unistd.h> 54 #include <wchar.h> 55 #include <wctype.h> 56 57 /* 58 * expand - expand tabs to equivalent spaces 59 */ 60 int nstops; 61 int tabstops[100]; 62 63 static void getstops(char *); 64 static void usage(void); 65 66 int 67 main(int argc, char *argv[]) 68 { 69 const char *curfile; 70 wint_t wc; 71 int c, column; 72 int n; 73 int rval; 74 int width; 75 76 setlocale(LC_CTYPE, ""); 77 78 /* handle obsolete syntax */ 79 while (argc > 1 && argv[1][0] == '-' && 80 isdigit((unsigned char)argv[1][1])) { 81 getstops(&argv[1][1]); 82 argc--; argv++; 83 } 84 85 while ((c = getopt (argc, argv, "t:")) != -1) { 86 switch (c) { 87 case 't': 88 getstops(optarg); 89 break; 90 case '?': 91 default: 92 usage(); 93 /* NOTREACHED */ 94 } 95 } 96 argc -= optind; 97 argv += optind; 98 99 rval = 0; 100 do { 101 if (argc > 0) { 102 if (freopen(argv[0], "r", stdin) == NULL) { 103 warn("%s", argv[0]); 104 rval = 1; 105 argc--, argv++; 106 continue; 107 } 108 curfile = argv[0]; 109 argc--, argv++; 110 } else 111 curfile = "stdin"; 112 column = 0; 113 while ((wc = getwchar()) != WEOF) { 114 switch (wc) { 115 case '\t': 116 if (nstops == 0) { 117 do { 118 putwchar(' '); 119 column++; 120 } while (column & 07); 121 continue; 122 } 123 if (nstops == 1) { 124 do { 125 putwchar(' '); 126 column++; 127 } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); 128 continue; 129 } 130 for (n = 0; n < nstops; n++) 131 if (tabstops[n] > column) 132 break; 133 if (n == nstops) { 134 putwchar(' '); 135 column++; 136 continue; 137 } 138 while (column < tabstops[n]) { 139 putwchar(' '); 140 column++; 141 } 142 continue; 143 144 case '\b': 145 if (column) 146 column--; 147 putwchar('\b'); 148 continue; 149 150 default: 151 putwchar(wc); 152 if ((width = wcwidth(wc)) > 0) 153 column += width; 154 continue; 155 156 case '\n': 157 putwchar(wc); 158 column = 0; 159 continue; 160 } 161 } 162 if (ferror(stdin)) { 163 warn("%s", curfile); 164 rval = 1; 165 } 166 } while (argc > 0); 167 exit(rval); 168 } 169 170 static void 171 getstops(char *cp) 172 { 173 int i; 174 175 nstops = 0; 176 for (;;) { 177 i = 0; 178 while (*cp >= '0' && *cp <= '9') 179 i = i * 10 + *cp++ - '0'; 180 if (i <= 0) 181 errx(1, "bad tab stop spec"); 182 if (nstops > 0 && i <= tabstops[nstops-1]) 183 errx(1, "bad tab stop spec"); 184 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 185 errx(1, "too many tab stops"); 186 tabstops[nstops++] = i; 187 if (*cp == 0) 188 break; 189 if (*cp != ',' && !isblank((unsigned char)*cp)) 190 errx(1, "bad tab stop spec"); 191 cp++; 192 } 193 } 194 195 static void 196 usage(void) 197 { 198 (void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n"); 199 exit(1); 200 } 201