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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1980, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)unexpand.c 8.1 (Berkeley) 6/6/93 31 * $FreeBSD: head/usr.bin/unexpand/unexpand.c 227192 2011-11-06 08:18:05Z ed $ 32 */ 33 34 /* 35 * unexpand - put tabs into a file replacing blanks 36 */ 37 #include <ctype.h> 38 #include <err.h> 39 #include <limits.h> 40 #include <locale.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 #include <wchar.h> 46 #include <wctype.h> 47 48 static int all; 49 static int nstops; 50 static int tabstops[100]; 51 52 static void getstops(const char *); 53 static void usage(void); 54 static int tabify(const char *); 55 56 int 57 main(int argc, char *argv[]) 58 { 59 int ch, failed; 60 char *filename; 61 62 setlocale(LC_CTYPE, ""); 63 64 nstops = 1; 65 tabstops[0] = 8; 66 while ((ch = getopt(argc, argv, "at:")) != -1) { 67 switch (ch) { 68 case 'a': /* Un-expand all spaces, not just leading. */ 69 all = 1; 70 break; 71 case 't': /* Specify tab list, implies -a. */ 72 getstops(optarg); 73 all = 1; 74 break; 75 default: 76 usage(); 77 /*NOTREACHED*/ 78 } 79 } 80 argc -= optind; 81 argv += optind; 82 83 failed = 0; 84 if (argc == 0) 85 failed |= tabify("stdin"); 86 else { 87 while ((filename = *argv++) != NULL) { 88 if (freopen(filename, "r", stdin) == NULL) { 89 warn("%s", filename); 90 failed = 1; 91 } else 92 failed |= tabify(filename); 93 } 94 } 95 exit(failed != 0); 96 } 97 98 static void 99 usage(void) 100 { 101 fprintf(stderr, "usage: unexpand [-a | -t tablist] [file ...]\n"); 102 exit(1); 103 } 104 105 static int 106 tabify(const char *curfile) 107 { 108 int dcol, doneline, limit, n, ocol, width; 109 wint_t ch; 110 111 limit = nstops == 1 ? INT_MAX : tabstops[nstops - 1] - 1; 112 113 doneline = ocol = dcol = 0; 114 while ((ch = getwchar()) != WEOF) { 115 if (ch == ' ' && !doneline) { 116 if (++dcol >= limit) 117 doneline = 1; 118 continue; 119 } else if (ch == '\t') { 120 if (nstops == 1) { 121 dcol = (1 + dcol / tabstops[0]) * 122 tabstops[0]; 123 continue; 124 } else { 125 for (n = 0; tabstops[n] - 1 < dcol && 126 n < nstops; n++) 127 ; 128 if (n < nstops - 1 && tabstops[n] - 1 < limit) { 129 dcol = tabstops[n]; 130 continue; 131 } 132 doneline = 1; 133 } 134 } 135 136 /* Output maximal number of tabs. */ 137 if (nstops == 1) { 138 while (((ocol + tabstops[0]) / tabstops[0]) 139 <= (dcol / tabstops[0])) { 140 if (dcol - ocol < 2) 141 break; 142 putwchar('\t'); 143 ocol = (1 + ocol / tabstops[0]) * 144 tabstops[0]; 145 } 146 } else { 147 for (n = 0; tabstops[n] - 1 < ocol && n < nstops; n++) 148 ; 149 while (ocol < dcol && n < nstops && ocol < limit) { 150 putwchar('\t'); 151 ocol = tabstops[n++]; 152 } 153 } 154 155 /* Then spaces. */ 156 while (ocol < dcol && ocol < limit) { 157 putwchar(' '); 158 ocol++; 159 } 160 161 if (ch == '\b') { 162 putwchar('\b'); 163 if (ocol > 0) 164 ocol--, dcol--; 165 } else if (ch == '\n') { 166 putwchar('\n'); 167 doneline = ocol = dcol = 0; 168 continue; 169 } else if (ch != ' ' || dcol > limit) { 170 putwchar(ch); 171 if ((width = wcwidth(ch)) > 0) 172 ocol += width, dcol += width; 173 } 174 175 /* 176 * Only processing leading blanks or we've gone past the 177 * last tab stop. Emit remainder of this line unchanged. 178 */ 179 if (!all || dcol >= limit) { 180 while ((ch = getwchar()) != '\n' && ch != WEOF) 181 putwchar(ch); 182 if (ch == '\n') 183 putwchar('\n'); 184 doneline = ocol = dcol = 0; 185 } 186 } 187 if (ferror(stdin)) { 188 warn("%s", curfile); 189 return (1); 190 } 191 return (0); 192 } 193 194 static void 195 getstops(const char *cp) 196 { 197 int i; 198 199 nstops = 0; 200 for (;;) { 201 i = 0; 202 while (*cp >= '0' && *cp <= '9') 203 i = i * 10 + *cp++ - '0'; 204 if (i <= 0) 205 errx(1, "bad tab stop spec"); 206 if (nstops > 0 && i <= tabstops[nstops-1]) 207 errx(1, "bad tab stop spec"); 208 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 209 errx(1, "too many tab stops"); 210 tabstops[nstops++] = i; 211 if (*cp == 0) 212 break; 213 if (*cp != ',' && !isblank((unsigned char)*cp)) 214 errx(1, "bad tab stop spec"); 215 cp++; 216 } 217 } 218