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 <sys/cdefs.h> 33 34 __FBSDID("$FreeBSD$"); 35 36 #ifndef lint 37 static const char copyright[] = 38 "@(#) Copyright (c) 1980, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif 41 42 #ifndef lint 43 static const char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93"; 44 #endif 45 46 /* 47 * unexpand - put tabs into a file replacing blanks 48 */ 49 #include <ctype.h> 50 #include <err.h> 51 #include <limits.h> 52 #include <locale.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 #include <wchar.h> 58 #include <wctype.h> 59 60 static int all; 61 static int nstops; 62 static int tabstops[100]; 63 64 static void getstops(const char *); 65 static void usage(void); 66 static int tabify(const char *); 67 68 int 69 main(int argc, char *argv[]) 70 { 71 int ch, failed; 72 char *filename; 73 74 setlocale(LC_CTYPE, ""); 75 76 nstops = 1; 77 tabstops[0] = 8; 78 while ((ch = getopt(argc, argv, "at:")) != -1) { 79 switch (ch) { 80 case 'a': /* Un-expand all spaces, not just leading. */ 81 all = 1; 82 break; 83 case 't': /* Specify tab list, implies -a. */ 84 getstops(optarg); 85 all = 1; 86 break; 87 default: 88 usage(); 89 /*NOTREACHED*/ 90 } 91 } 92 argc -= optind; 93 argv += optind; 94 95 failed = 0; 96 if (argc == 0) 97 failed |= tabify("stdin"); 98 else { 99 while ((filename = *argv++) != NULL) { 100 if (freopen(filename, "r", stdin) == NULL) { 101 warn("%s", filename); 102 failed = 1; 103 } else 104 failed |= tabify(filename); 105 } 106 } 107 exit(failed != 0); 108 } 109 110 static void 111 usage(void) 112 { 113 fprintf(stderr, "usage: unexpand [-a | -t tablist] [file ...]\n"); 114 exit(1); 115 } 116 117 static int 118 tabify(const char *curfile) 119 { 120 int dcol, doneline, limit, n, ocol, width; 121 wint_t ch; 122 123 limit = nstops == 1 ? INT_MAX : tabstops[nstops - 1] - 1; 124 125 doneline = ocol = dcol = 0; 126 while ((ch = getwchar()) != WEOF) { 127 if (ch == ' ' && !doneline) { 128 if (++dcol >= limit) 129 doneline = 1; 130 continue; 131 } else if (ch == '\t') { 132 if (nstops == 1) { 133 dcol = (1 + dcol / tabstops[0]) * 134 tabstops[0]; 135 continue; 136 } else { 137 for (n = 0; n < nstops && 138 tabstops[n] - 1 < dcol; n++) 139 ; 140 if (n < nstops - 1 && tabstops[n] - 1 < limit) { 141 dcol = tabstops[n]; 142 continue; 143 } 144 doneline = 1; 145 } 146 } 147 148 /* Output maximal number of tabs. */ 149 if (nstops == 1) { 150 while (((ocol + tabstops[0]) / tabstops[0]) 151 <= (dcol / tabstops[0])) { 152 if (dcol - ocol < 2) 153 break; 154 putwchar('\t'); 155 ocol = (1 + ocol / tabstops[0]) * 156 tabstops[0]; 157 } 158 } else { 159 for (n = 0; n < nstops && tabstops[n] - 1 < ocol; n++) 160 ; 161 while (ocol < dcol && n < nstops && ocol < limit) { 162 putwchar('\t'); 163 ocol = tabstops[n++]; 164 } 165 } 166 167 /* Then spaces. */ 168 while (ocol < dcol && ocol < limit) { 169 putwchar(' '); 170 ocol++; 171 } 172 173 if (ch == '\b') { 174 putwchar('\b'); 175 if (ocol > 0) 176 ocol--, dcol--; 177 } else if (ch == '\n') { 178 putwchar('\n'); 179 doneline = ocol = dcol = 0; 180 continue; 181 } else if (ch != ' ' || dcol > limit) { 182 putwchar(ch); 183 if ((width = wcwidth(ch)) > 0) 184 ocol += width, dcol += width; 185 } 186 187 /* 188 * Only processing leading blanks or we've gone past the 189 * last tab stop. Emit remainder of this line unchanged. 190 */ 191 if (!all || dcol >= limit) { 192 while ((ch = getwchar()) != '\n' && ch != WEOF) 193 putwchar(ch); 194 if (ch == '\n') 195 putwchar('\n'); 196 doneline = ocol = dcol = 0; 197 } 198 } 199 if (ferror(stdin)) { 200 warn("%s", curfile); 201 return (1); 202 } 203 return (0); 204 } 205 206 static void 207 getstops(const char *cp) 208 { 209 int i; 210 211 nstops = 0; 212 for (;;) { 213 i = 0; 214 while (*cp >= '0' && *cp <= '9') 215 i = i * 10 + *cp++ - '0'; 216 if (i <= 0) 217 errx(1, "bad tab stop spec"); 218 if (nstops > 0 && i <= tabstops[nstops-1]) 219 errx(1, "bad tab stop spec"); 220 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 221 errx(1, "too many tab stops"); 222 tabstops[nstops++] = i; 223 if (*cp == 0) 224 break; 225 if (*cp != ',' && !isblank((unsigned char)*cp)) 226 errx(1, "bad tab stop spec"); 227 cp++; 228 } 229 } 230