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 #include <sys/cdefs.h> 35 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef lint 39 static const char copyright[] = 40 "@(#) Copyright (c) 1980, 1993\n\ 41 The Regents of the University of California. All rights reserved.\n"; 42 #endif 43 44 #ifndef lint 45 static const char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93"; 46 #endif 47 48 /* 49 * unexpand - put tabs into a file replacing blanks 50 */ 51 #include <ctype.h> 52 #include <err.h> 53 #include <limits.h> 54 #include <locale.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 #include <wchar.h> 60 #include <wctype.h> 61 62 int all; 63 int nstops; 64 int tabstops[100]; 65 66 static void getstops(const char *); 67 static void usage(void); 68 static int tabify(const char *); 69 70 int 71 main(int argc, char *argv[]) 72 { 73 int ch, failed; 74 char *filename; 75 76 setlocale(LC_CTYPE, ""); 77 78 nstops = 1; 79 tabstops[0] = 8; 80 while ((ch = getopt(argc, argv, "at:")) != -1) { 81 switch (ch) { 82 case 'a': /* Un-expand all spaces, not just leading. */ 83 all = 1; 84 break; 85 case 't': /* Specify tab list, implies -a. */ 86 getstops(optarg); 87 all = 1; 88 break; 89 default: 90 usage(); 91 /*NOTREACHED*/ 92 } 93 } 94 argc -= optind; 95 argv += optind; 96 97 failed = 0; 98 if (argc == 0) 99 failed |= tabify("stdin"); 100 else { 101 while ((filename = *argv++) != NULL) { 102 if (freopen(filename, "r", stdin) == NULL) { 103 warn("%s", filename); 104 failed = 1; 105 } else 106 failed |= tabify(filename); 107 } 108 } 109 exit(failed != 0); 110 } 111 112 static void 113 usage(void) 114 { 115 fprintf(stderr, "usage: unexpand [-a | -t tablist] [file ...]\n"); 116 exit(1); 117 } 118 119 static int 120 tabify(const char *curfile) 121 { 122 int dcol, doneline, limit, n, ocol, width; 123 wint_t ch; 124 125 limit = nstops == 1 ? INT_MAX : tabstops[nstops - 1] - 1; 126 127 doneline = ocol = dcol = 0; 128 while ((ch = getwchar()) != WEOF) { 129 if (ch == ' ' && !doneline) { 130 if (++dcol >= limit) 131 doneline = 1; 132 continue; 133 } else if (ch == '\t') { 134 if (nstops == 1) { 135 dcol = (1 + dcol / tabstops[0]) * 136 tabstops[0]; 137 continue; 138 } else { 139 for (n = 0; tabstops[n] - 1 < dcol && 140 n < nstops; n++) 141 ; 142 if (n < nstops - 1 && tabstops[n] - 1 < limit) { 143 dcol = tabstops[n]; 144 continue; 145 } 146 doneline = 1; 147 } 148 } 149 150 /* Output maximal number of tabs. */ 151 if (nstops == 1) { 152 while (((ocol + tabstops[0]) / tabstops[0]) 153 <= (dcol / tabstops[0])) { 154 if (dcol - ocol < 2) 155 break; 156 putwchar('\t'); 157 ocol = (1 + ocol / tabstops[0]) * 158 tabstops[0]; 159 } 160 } else { 161 for (n = 0; tabstops[n] - 1 < ocol && n < nstops; n++) 162 ; 163 while (ocol < dcol && n < nstops && ocol < limit) { 164 putwchar('\t'); 165 ocol = tabstops[n++]; 166 } 167 } 168 169 /* Then spaces. */ 170 while (ocol < dcol && ocol < limit) { 171 putwchar(' '); 172 ocol++; 173 } 174 175 if (ch == '\b') { 176 putwchar('\b'); 177 if (ocol > 0) 178 ocol--, dcol--; 179 } else if (ch == '\n') { 180 putwchar('\n'); 181 doneline = ocol = dcol = 0; 182 continue; 183 } else if (ch != ' ' || dcol > limit) { 184 putwchar(ch); 185 if ((width = wcwidth(ch)) > 0) 186 ocol += width, dcol += width; 187 } 188 189 /* 190 * Only processing leading blanks or we've gone past the 191 * last tab stop. Emit remainder of this line unchanged. 192 */ 193 if (!all || dcol >= limit) { 194 while ((ch = getwchar()) != '\n' && ch != WEOF) 195 putwchar(ch); 196 if (ch == '\n') 197 putwchar('\n'); 198 doneline = ocol = dcol = 0; 199 } 200 } 201 if (ferror(stdin)) { 202 warn("%s", curfile); 203 return (1); 204 } 205 return (0); 206 } 207 208 static void 209 getstops(const char *cp) 210 { 211 int i; 212 213 nstops = 0; 214 for (;;) { 215 i = 0; 216 while (*cp >= '0' && *cp <= '9') 217 i = i * 10 + *cp++ - '0'; 218 if (i <= 0) 219 errx(1, "bad tab stop spec"); 220 if (nstops > 0 && i <= tabstops[nstops-1]) 221 errx(1, "bad tab stop spec"); 222 if (nstops == sizeof(tabstops) / sizeof(*tabstops)) 223 errx(1, "too many tab stops"); 224 tabstops[nstops++] = i; 225 if (*cp == 0) 226 break; 227 if (*cp != ',' && !isblank((unsigned char)*cp)) 228 errx(1, "bad tab stop spec"); 229 cp++; 230 } 231 } 232