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 30 #include <sys/cdefs.h> 31 32 __FBSDID("$FreeBSD$"); 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 39 40 #ifndef lint 41 static const char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93"; 42 #endif 43 44 /* 45 * unexpand - put tabs into a file replacing blanks 46 */ 47 #include <ctype.h> 48 #include <err.h> 49 #include <limits.h> 50 #include <locale.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 #include <wchar.h> 56 #include <wctype.h> 57 58 static int all; 59 static int nstops; 60 static int tabstops[100]; 61 62 static void getstops(const char *); 63 static void usage(void); 64 static int tabify(const char *); 65 66 int 67 main(int argc, char *argv[]) 68 { 69 int ch, failed; 70 char *filename; 71 72 setlocale(LC_CTYPE, ""); 73 74 nstops = 1; 75 tabstops[0] = 8; 76 while ((ch = getopt(argc, argv, "at:")) != -1) { 77 switch (ch) { 78 case 'a': /* Un-expand all spaces, not just leading. */ 79 all = 1; 80 break; 81 case 't': /* Specify tab list, implies -a. */ 82 getstops(optarg); 83 all = 1; 84 break; 85 default: 86 usage(); 87 /*NOTREACHED*/ 88 } 89 } 90 argc -= optind; 91 argv += optind; 92 93 failed = 0; 94 if (argc == 0) 95 failed |= tabify("stdin"); 96 else { 97 while ((filename = *argv++) != NULL) { 98 if (freopen(filename, "r", stdin) == NULL) { 99 warn("%s", filename); 100 failed = 1; 101 } else 102 failed |= tabify(filename); 103 } 104 } 105 exit(failed != 0); 106 } 107 108 static void 109 usage(void) 110 { 111 fprintf(stderr, "usage: unexpand [-a | -t tablist] [file ...]\n"); 112 exit(1); 113 } 114 115 static int 116 tabify(const char *curfile) 117 { 118 int dcol, doneline, limit, n, ocol, width; 119 wint_t ch; 120 121 limit = nstops == 1 ? INT_MAX : tabstops[nstops - 1] - 1; 122 123 doneline = ocol = dcol = 0; 124 while ((ch = getwchar()) != WEOF) { 125 if (ch == ' ' && !doneline) { 126 if (++dcol >= limit) 127 doneline = 1; 128 continue; 129 } else if (ch == '\t') { 130 if (nstops == 1) { 131 dcol = (1 + dcol / tabstops[0]) * 132 tabstops[0]; 133 continue; 134 } else { 135 for (n = 0; tabstops[n] - 1 < dcol && 136 n < nstops; n++) 137 ; 138 if (n < nstops - 1 && tabstops[n] - 1 < limit) { 139 dcol = tabstops[n]; 140 continue; 141 } 142 doneline = 1; 143 } 144 } 145 146 /* Output maximal number of tabs. */ 147 if (nstops == 1) { 148 while (((ocol + tabstops[0]) / tabstops[0]) 149 <= (dcol / tabstops[0])) { 150 if (dcol - ocol < 2) 151 break; 152 putwchar('\t'); 153 ocol = (1 + ocol / tabstops[0]) * 154 tabstops[0]; 155 } 156 } else { 157 for (n = 0; tabstops[n] - 1 < ocol && n < nstops; n++) 158 ; 159 while (ocol < dcol && n < nstops && ocol < limit) { 160 putwchar('\t'); 161 ocol = tabstops[n++]; 162 } 163 } 164 165 /* Then spaces. */ 166 while (ocol < dcol && ocol < limit) { 167 putwchar(' '); 168 ocol++; 169 } 170 171 if (ch == '\b') { 172 putwchar('\b'); 173 if (ocol > 0) 174 ocol--, dcol--; 175 } else if (ch == '\n') { 176 putwchar('\n'); 177 doneline = ocol = dcol = 0; 178 continue; 179 } else if (ch != ' ' || dcol > limit) { 180 putwchar(ch); 181 if ((width = wcwidth(ch)) > 0) 182 ocol += width, dcol += width; 183 } 184 185 /* 186 * Only processing leading blanks or we've gone past the 187 * last tab stop. Emit remainder of this line unchanged. 188 */ 189 if (!all || dcol >= limit) { 190 while ((ch = getwchar()) != '\n' && ch != WEOF) 191 putwchar(ch); 192 if (ch == '\n') 193 putwchar('\n'); 194 doneline = ocol = dcol = 0; 195 } 196 } 197 if (ferror(stdin)) { 198 warn("%s", curfile); 199 return (1); 200 } 201 return (0); 202 } 203 204 static void 205 getstops(const char *cp) 206 { 207 int i; 208 209 nstops = 0; 210 for (;;) { 211 i = 0; 212 while (*cp >= '0' && *cp <= '9') 213 i = i * 10 + *cp++ - '0'; 214 if (i <= 0) 215 errx(1, "bad tab stop spec"); 216 if (nstops > 0 && i <= tabstops[nstops-1]) 217 errx(1, "bad tab stop spec"); 218 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 219 errx(1, "too many tab stops"); 220 tabstops[nstops++] = i; 221 if (*cp == 0) 222 break; 223 if (*cp != ',' && !isblank((unsigned char)*cp)) 224 errx(1, "bad tab stop spec"); 225 cp++; 226 } 227 } 228