1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * University Copyright- Copyright (c) 1982, 1986, 1988 32 * The Regents of the University of California 33 * All Rights Reserved 34 * 35 * University Acknowledgment- Portions of this document are derived from 36 * software developed by the University of California, Berkeley, and its 37 * contributors. 38 */ 39 40 #include <ctype.h> 41 #include "tdef.h" 42 #include "ext.h" 43 #define HY_BIT 0200 /* stuff in here only works for ascii */ 44 45 /* 46 * troff8.c 47 * 48 * hyphenation 49 */ 50 51 char hbuf[NHEX]; 52 char *nexth = hbuf; 53 tchar *hyend; 54 #define THRESH 160 /*digram goodness threshold*/ 55 int thresh = THRESH; 56 57 int 58 hyphen(wp) 59 tchar *wp; 60 { 61 int j; 62 tchar *i; 63 64 i = wp; 65 while (punct(cbits(*i++))) 66 ; 67 if (!alph(cbits(*--i))) 68 return (0); 69 wdstart = i++; 70 while (alph(cbits(*i++))) 71 ; 72 hyend = wdend = --i - 1; 73 while (punct(cbits(*i++))) 74 ; 75 if (*--i) 76 return (0); 77 if ((wdend - wdstart - 4) < 0) 78 return (0); 79 hyp = hyptr; 80 *hyp = 0; 81 hyoff = 2; 82 if (!exword() && !suffix()) 83 digram(); 84 *hyp++ = 0; 85 if (*hyptr) 86 for (j = 1; j; ) { 87 j = 0; 88 for (hyp = hyptr + 1; *hyp != 0; hyp++) { 89 if (*(hyp - 1) > *hyp) { 90 j++; 91 i = *hyp; 92 *hyp = *(hyp - 1); 93 *(hyp - 1) = i; 94 } 95 } 96 } 97 98 return (0); 99 } 100 101 102 int 103 punct(int i) 104 { 105 if (!i || alph(i)) 106 return(0); 107 else 108 return(1); 109 } 110 111 112 int 113 alph(int i) 114 { 115 if (i >= 'a' && i <= 'z' || i >= 'A' && i <= 'Z') 116 return(1); 117 else 118 return(0); 119 } 120 121 122 int 123 caseht() 124 { 125 thresh = THRESH; 126 if (skip()) 127 return (0); 128 noscale++; 129 thresh = atoi(); 130 noscale = 0; 131 132 return (0); 133 } 134 135 136 int 137 casehw() 138 { 139 int i, k; 140 char *j; 141 tchar t; 142 143 k = 0; 144 while (!skip()) { 145 if ((j = nexth) >= (hbuf + NHEX - 2)) 146 goto full; 147 for (; ; ) { 148 if (ismot(t = getch())) 149 continue; 150 i = cbits(t); 151 if (i == ' ' || i == '\n') { 152 *j++ = 0; 153 nexth = j; 154 *j = 0; 155 if (i == ' ') 156 break; 157 else 158 return (0); 159 } 160 if (i == '-') { 161 k = HY_BIT; 162 continue; 163 } 164 *j++ = maplow(i) | k; 165 k = 0; 166 if (j >= (hbuf + NHEX - 2)) 167 goto full; 168 } 169 } 170 return (0); 171 full: 172 errprint(gettext("exception word list full.")); 173 *nexth = 0; 174 175 return (0); 176 } 177 178 179 int 180 exword() 181 { 182 tchar *w; 183 char *e; 184 char *save; 185 186 e = hbuf; 187 while (1) { 188 save = e; 189 if (*e == 0) 190 return(0); 191 w = wdstart; 192 while (*e && w <= hyend && (*e & 0177) == maplow(cbits(*w))) { 193 e++; 194 w++; 195 }; 196 if (!*e) { 197 if (w-1 == hyend || (w == wdend && maplow(cbits(*w)) == 's')) { 198 w = wdstart; 199 for (e = save; *e; e++) { 200 if (*e & HY_BIT) 201 *hyp++ = w; 202 if (hyp > (hyptr + NHYP - 1)) 203 hyp = hyptr + NHYP - 1; 204 w++; 205 } 206 return(1); 207 } else { 208 e++; 209 continue; 210 } 211 } else 212 while (*e++) 213 ; 214 } 215 216 return (0); 217 } 218 219 220 int 221 suffix() 222 { 223 tchar *w; 224 char *s, *s0; 225 tchar i; 226 extern char *suftab[]; 227 extern tchar *chkvow(); 228 229 again: 230 if (!alph(cbits(i = cbits(*hyend)))) 231 return(0); 232 if (i < 'a') 233 i -= 'A' - 'a'; 234 if ((s0 = suftab[i-'a']) == 0) 235 return(0); 236 for (; ; ) { 237 if ((i = *s0 & 017) == 0) 238 return(0); 239 s = s0 + i - 1; 240 w = hyend - 1; 241 while (s > s0 && w >= wdstart && (*s & 0177) == maplow(cbits(*w))) { 242 s--; 243 w--; 244 } 245 if (s == s0) 246 break; 247 s0 += i; 248 } 249 s = s0 + i - 1; 250 w = hyend; 251 if (*s0 & HY_BIT) 252 goto mark; 253 while (s > s0) { 254 w--; 255 if (*s-- & HY_BIT) { 256 mark: 257 hyend = w - 1; 258 if (*s0 & 0100) 259 continue; 260 if (!chkvow(w)) 261 return(0); 262 *hyp++ = w; 263 } 264 } 265 if (*s0 & 040) 266 return(0); 267 if (exword()) 268 return(1); 269 goto again; 270 } 271 272 273 int 274 maplow(i) 275 int i; 276 { 277 if (ischar(i) && isupper(i)) 278 i = tolower(i); 279 return(i); 280 } 281 282 283 int 284 vowel(i) 285 int i; 286 { 287 switch (maplow(i)) { 288 case 'a': 289 case 'e': 290 case 'i': 291 case 'o': 292 case 'u': 293 case 'y': 294 return(1); 295 default: 296 return(0); 297 } 298 } 299 300 301 tchar *chkvow(w) 302 tchar *w; 303 { 304 while (--w >= wdstart) 305 if (vowel(cbits(*w))) 306 return(w); 307 return(0); 308 } 309 310 311 int 312 digram() 313 { 314 tchar *w; 315 int val; 316 tchar * nhyend, *maxw; 317 int maxval; 318 extern char bxh[26][13], bxxh[26][13], xxh[26][13], xhx[26][13], hxx[26][13]; 319 320 again: 321 if (!(w = chkvow(hyend + 1))) 322 return (0); 323 hyend = w; 324 if (!(w = chkvow(hyend))) 325 return (0); 326 nhyend = w; 327 maxval = 0; 328 w--; 329 while ((++w < hyend) && (w < (wdend - 1))) { 330 val = 1; 331 if (w == wdstart) 332 val *= dilook('a', cbits(*w), bxh); 333 else if (w == wdstart + 1) 334 val *= dilook(cbits(*(w-1)), cbits(*w), bxxh); 335 else 336 val *= dilook(cbits(*(w-1)), cbits(*w), xxh); 337 val *= dilook(cbits(*w), cbits(*(w+1)), xhx); 338 val *= dilook(cbits(*(w+1)), cbits(*(w+2)), hxx); 339 if (val > maxval) { 340 maxval = val; 341 maxw = w + 1; 342 } 343 } 344 hyend = nhyend; 345 if (maxval > thresh) 346 *hyp++ = maxw; 347 goto again; 348 } 349 350 351 int 352 dilook(a, b, t) 353 int a, b; 354 char t[26][13]; 355 { 356 int i, j; 357 358 i = t[maplow(a)-'a'][(j = maplow(b)-'a')/2]; 359 if (!(j & 01)) 360 i >>= 4; 361 return(i & 017); 362 } 363 364 365