1 /* $NetBSD: fpr.c,v 1.4 1997/10/18 15:05:47 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Robert Corbett. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __COPYRIGHT("@(#) Copyright (c) 1989, 1993\n\ 42 The Regents of the University of California. All rights reserved.\n"); 43 #endif /* not lint */ 44 45 #ifndef lint 46 #if 0 47 static char sccsid[] = "@(#)fpr.c 8.1 (Berkeley) 6/6/93"; 48 #endif 49 __RCSID("$NetBSD: fpr.c,v 1.4 1997/10/18 15:05:47 lukem Exp $"); 50 #endif /* not lint */ 51 52 #include <err.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 56 #define BLANK ' ' 57 #define TAB '\t' 58 #define NUL '\000' 59 #define FF '\f' 60 #define BS '\b' 61 #define CR '\r' 62 #define VTAB '\013' 63 #define EOL '\n' 64 65 #define TRUE 1 66 #define FALSE 0 67 68 #define MAXCOL 170 69 #define TABSIZE 8 70 #define INITWIDTH 8 71 72 typedef 73 struct column { 74 int count; 75 int width; 76 char *str; 77 } 78 COLUMN; 79 80 char cc; 81 char saved; 82 int length; 83 char *text; 84 int highcol; 85 COLUMN *line; 86 int maxpos; 87 int maxcol; 88 89 void flush __P((void)); 90 void gettext __P((void)); 91 void init __P((void)); 92 int main __P((int, char **)); 93 void nospace __P((void)); 94 void savech __P((int)); 95 96 int 97 main(argc, argv) 98 int argc; 99 char **argv; 100 { 101 int ch; 102 char ateof; 103 int i; 104 int errorcount; 105 106 107 init(); 108 errorcount = 0; 109 ateof = FALSE; 110 111 ch = getchar(); 112 if (ch == EOF) 113 exit(0); 114 115 if (ch == EOL) { 116 cc = NUL; 117 ungetc((int) EOL, stdin); 118 } else 119 if (ch == BLANK) 120 cc = NUL; 121 else 122 if (ch == '1') 123 cc = FF; 124 else 125 if (ch == '0') 126 cc = EOL; 127 else 128 if (ch == '+') 129 cc = CR; 130 else { 131 errorcount = 1; 132 cc = NUL; 133 ungetc(ch, stdin); 134 } 135 136 while (!ateof) { 137 gettext(); 138 ch = getchar(); 139 if (ch == EOF) { 140 flush(); 141 ateof = TRUE; 142 } else 143 if (ch == EOL) { 144 flush(); 145 cc = NUL; 146 ungetc((int) EOL, stdin); 147 } else 148 if (ch == BLANK) { 149 flush(); 150 cc = NUL; 151 } else 152 if (ch == '1') { 153 flush(); 154 cc = FF; 155 } else 156 if (ch == '0') { 157 flush(); 158 cc = EOL; 159 } else 160 if (ch == '+') { 161 for (i = 0; i < length; i++) 162 savech(i); 163 } else { 164 errorcount++; 165 flush(); 166 cc = NUL; 167 ungetc(ch, stdin); 168 } 169 } 170 171 if (errorcount == 1) 172 fprintf(stderr, "Illegal carriage control - 1 line.\n"); 173 else 174 if (errorcount > 1) 175 fprintf(stderr, "Illegal carriage control - %d lines.\n", errorcount); 176 177 exit(0); 178 } 179 180 void 181 init() 182 { 183 COLUMN *cp; 184 COLUMN *cend; 185 char *sp; 186 187 188 length = 0; 189 maxpos = MAXCOL; 190 sp = malloc((unsigned) maxpos); 191 if (sp == NULL) 192 nospace(); 193 text = sp; 194 195 highcol = -1; 196 maxcol = MAXCOL; 197 line = (COLUMN *) calloc(maxcol, (unsigned) sizeof(COLUMN)); 198 if (line == NULL) 199 nospace(); 200 cp = line; 201 cend = line + (maxcol - 1); 202 while (cp <= cend) { 203 cp->width = INITWIDTH; 204 sp = calloc(INITWIDTH, (unsigned) sizeof(char)); 205 if (sp == NULL) 206 nospace(); 207 cp->str = sp; 208 cp++; 209 } 210 } 211 212 void 213 gettext() 214 { 215 int i; 216 char ateol; 217 int ch; 218 int pos; 219 220 i = 0; 221 ateol = FALSE; 222 223 while (!ateol) { 224 ch = getchar(); 225 if (ch == EOL || ch == EOF) 226 ateol = TRUE; 227 else 228 if (ch == TAB) { 229 pos = (1 + i / TABSIZE) * TABSIZE; 230 if (pos > maxpos) { 231 maxpos = pos + 10; 232 text = realloc(text, (unsigned) maxpos); 233 if (text == NULL) 234 nospace(); 235 } 236 while (i < pos) { 237 text[i] = BLANK; 238 i++; 239 } 240 } else 241 if (ch == BS) { 242 if (i > 0) { 243 i--; 244 savech(i); 245 } 246 } else 247 if (ch == CR) { 248 while (i > 0) { 249 i--; 250 savech(i); 251 } 252 } else 253 if (ch == FF || ch == VTAB) { 254 flush(); 255 cc = ch; 256 i = 0; 257 } else { 258 if (i >= maxpos) { 259 maxpos = i + 10; 260 text = realloc(text, (unsigned) maxpos); 261 if (text == NULL) 262 nospace(); 263 } 264 text[i] = ch; 265 i++; 266 } 267 } 268 269 length = i; 270 } 271 272 void 273 savech(col) 274 int col; 275 { 276 char ch; 277 int oldmax; 278 COLUMN *cp; 279 COLUMN *cend; 280 char *sp; 281 int newcount; 282 283 ch = text[col]; 284 if (ch == BLANK) 285 return; 286 287 saved = TRUE; 288 289 if (col >= highcol) 290 highcol = col; 291 292 if (col >= maxcol) { 293 oldmax = maxcol; 294 maxcol = col + 10; 295 line = (COLUMN *) realloc(line, (unsigned) maxcol * sizeof(COLUMN)); 296 if (line == NULL) 297 nospace(); 298 cp = line + oldmax; 299 cend = line + (maxcol - 1); 300 while (cp <= cend) { 301 cp->width = INITWIDTH; 302 cp->count = 0; 303 sp = calloc(INITWIDTH, (unsigned) sizeof(char)); 304 if (sp == NULL) 305 nospace(); 306 cp->str = sp; 307 cp++; 308 } 309 } 310 cp = line + col; 311 newcount = cp->count + 1; 312 if (newcount > cp->width) { 313 cp->width = newcount; 314 sp = realloc(cp->str, (unsigned) newcount * sizeof(char)); 315 if (sp == NULL) 316 nospace(); 317 cp->str = sp; 318 } 319 cp->count = newcount; 320 cp->str[newcount - 1] = ch; 321 } 322 323 void 324 flush() 325 { 326 int i; 327 int anchor; 328 int height; 329 int j; 330 331 if (cc != NUL) 332 putchar(cc); 333 334 if (!saved) { 335 i = length; 336 while (i > 0 && text[i - 1] == BLANK) 337 i--; 338 length = i; 339 for (i = 0; i < length; i++) 340 putchar(text[i]); 341 putchar(EOL); 342 return; 343 } 344 for (i = 0; i < length; i++) 345 savech(i); 346 347 anchor = 0; 348 while (anchor <= highcol) { 349 height = line[anchor].count; 350 if (height == 0) { 351 putchar(BLANK); 352 anchor++; 353 } else 354 if (height == 1) { 355 putchar(*(line[anchor].str)); 356 line[anchor].count = 0; 357 anchor++; 358 } else { 359 i = anchor; 360 while (i < highcol && line[i + 1].count > 1) 361 i++; 362 for (j = anchor; j <= i; j++) { 363 height = line[j].count - 1; 364 putchar(line[j].str[height]); 365 line[j].count = height; 366 } 367 for (j = anchor; j <= i; j++) 368 putchar(BS); 369 } 370 } 371 372 putchar(EOL); 373 highcol = -1; 374 } 375 376 void 377 nospace() 378 { 379 errx(1, "Storage limit exceeded."); 380 } 381