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parse.c revision 1.18 
      1 /*	$NetBSD: parse.c,v 1.18 2006/01/04 01:30:21 perry Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #if HAVE_NBTOOL_CONFIG_H
     33 #include "nbtool_config.h"
     34 #endif
     35 
     36 #include <sys/cdefs.h>
     37 #if !defined(lint)
     38 #if 0
     39 static char sccsid[] = "@(#)parse.c	8.1 (Berkeley) 6/6/93";
     40 #else
     41 __RCSID("$NetBSD: parse.c,v 1.18 2006/01/04 01:30:21 perry Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/types.h>
     46 #include <sys/file.h>
     47 
     48 #include <ctype.h>
     49 #include <err.h>
     50 #include <errno.h>
     51 #include <fcntl.h>
     52 #include <stdio.h>
     53 #include <stdlib.h>
     54 #include <string.h>
     55 
     56 #include "hexdump.h"
     57 
     58 FU *endfu;					/* format at end-of-data */
     59 
     60 void
     61 addfile(char *name)
     62 {
     63 	char *p;
     64 	FILE *fp;
     65 	int ch;
     66 	char buf[2048 + 1];
     67 
     68 	if ((fp = fopen(name, "r")) == NULL)
     69 		err(1, "fopen %s", name);
     70 	while (fgets(buf, sizeof(buf), fp)) {
     71 		if (!(p = strchr(buf, '\n'))) {
     72 			warnx("line too long.");
     73 			while ((ch = getchar()) != '\n' && ch != EOF);
     74 			continue;
     75 		}
     76 		*p = '\0';
     77 		for (p = buf; *p && isspace((unsigned char)*p); ++p);
     78 		if (!*p || *p == '#')
     79 			continue;
     80 		add(p);
     81 	}
     82 	(void)fclose(fp);
     83 }
     84 
     85 void
     86 add(const char *fmt)
     87 {
     88 	const char *p;
     89 	static FS **nextfs;
     90 	FS *tfs;
     91 	FU *tfu, **nextfu;
     92 	const char *savep;
     93 
     94 	/* start new linked list of format units */
     95 	tfs = emalloc(sizeof(FS));
     96 	if (!fshead)
     97 		fshead = tfs;
     98 	else
     99 		*nextfs = tfs;
    100 	nextfs = &tfs->nextfs;
    101 	nextfu = &tfs->nextfu;
    102 
    103 	/* take the format string and break it up into format units */
    104 	for (p = fmt;;) {
    105 		/* skip leading white space */
    106 		for (; isspace((unsigned char)*p); ++p);
    107 		if (!*p)
    108 			break;
    109 
    110 		/* allocate a new format unit and link it in */
    111 		tfu = emalloc(sizeof(FU));
    112 		*nextfu = tfu;
    113 		nextfu = &tfu->nextfu;
    114 		tfu->reps = 1;
    115 
    116 		/* if leading digit, repetition count */
    117 		if (isdigit((unsigned char)*p)) {
    118 			for (savep = p; isdigit((unsigned char)*p); ++p);
    119 			if (!isspace((unsigned char)*p) && *p != '/')
    120 				badfmt(fmt);
    121 			/* may overwrite either white space or slash */
    122 			tfu->reps = atoi(savep);
    123 			tfu->flags = F_SETREP;
    124 			/* skip trailing white space */
    125 			for (++p; isspace((unsigned char)*p); ++p);
    126 		}
    127 
    128 		/* skip slash and trailing white space */
    129 		if (*p == '/')
    130 			while (isspace((unsigned char)*++p));
    131 
    132 		/* byte count */
    133 		if (isdigit((unsigned char)*p)) {
    134 			for (savep = p; isdigit((unsigned char)*p); ++p);
    135 			if (!isspace((unsigned char)*p))
    136 				badfmt(fmt);
    137 			tfu->bcnt = atoi(savep);
    138 			/* skip trailing white space */
    139 			for (++p; isspace((unsigned char)*p); ++p);
    140 		}
    141 
    142 		/* format */
    143 		if (*p != '"')
    144 			badfmt(fmt);
    145 		for (savep = ++p; *p != '"';)
    146 			if (*p++ == 0)
    147 				badfmt(fmt);
    148 		if (!(tfu->fmt = malloc(p - savep + 1)))
    149 			nomem();
    150 		(void) strncpy(tfu->fmt, savep, p - savep);
    151 		tfu->fmt[p - savep] = '\0';
    152 		escape(tfu->fmt);
    153 		p++;
    154 	}
    155 }
    156 
    157 static const char *spec = ".#-+ 0123456789";
    158 
    159 int
    160 size(FS *fs)
    161 {
    162 	FU *fu;
    163 	int bcnt, cursize;
    164 	char *fmt;
    165 	int prec;
    166 
    167 	/* figure out the data block size needed for each format unit */
    168 	for (cursize = 0, fu = fs->nextfu; fu; fu = fu->nextfu) {
    169 		if (fu->bcnt) {
    170 			cursize += fu->bcnt * fu->reps;
    171 			continue;
    172 		}
    173 		for (bcnt = prec = 0, fmt = fu->fmt; *fmt; ++fmt) {
    174 			if (*fmt != '%')
    175 				continue;
    176 			/*
    177 			 * skip any special chars -- save precision in
    178 			 * case it's a %s format.
    179 			 */
    180 			while (strchr(spec + 1, *++fmt));
    181 			if (*fmt == '.' && isdigit((unsigned char)*++fmt)) {
    182 				prec = atoi(fmt);
    183 				while (isdigit((unsigned char)*++fmt));
    184 			}
    185 			switch(*fmt) {
    186 			case 'c':
    187 				bcnt += 1;
    188 				break;
    189 			case 'd': case 'i': case 'o': case 'u':
    190 			case 'x': case 'X':
    191 				bcnt += 4;
    192 				break;
    193 			case 'e': case 'E': case 'f': case 'g': case 'G':
    194 				bcnt += 8;
    195 				break;
    196 			case 's':
    197 				bcnt += prec;
    198 				break;
    199 			case '_':
    200 				switch(*++fmt) {
    201 				case 'c': case 'p': case 'u':
    202 					bcnt += 1;
    203 					break;
    204 				}
    205 			}
    206 		}
    207 		cursize += bcnt * fu->reps;
    208 	}
    209 	return (cursize);
    210 }
    211 
    212 void
    213 rewrite(FS *fs)
    214 {
    215 	enum { NOTOKAY, USEBCNT, USEPREC } sokay;
    216 	PR *pr, **nextpr;
    217 	FU *fu;
    218 	char *p1, *p2;
    219 	char savech, *fmtp, cs[3];
    220 	int nconv, prec;
    221 
    222 	nextpr = NULL;
    223 	prec = 0;
    224 	for (fu = fs->nextfu; fu; fu = fu->nextfu) {
    225 		/*
    226 		 * Break each format unit into print units; each conversion
    227 		 * character gets its own.
    228 		 */
    229 		for (nconv = 0, fmtp = fu->fmt; *fmtp; nextpr = &pr->nextpr) {
    230 			pr = emalloc(sizeof(PR));
    231 			if (!fu->nextpr)
    232 				fu->nextpr = pr;
    233 			else
    234 				*nextpr = pr;
    235 
    236 			/* Skip preceding text and up to the next % sign. */
    237 			for (p1 = fmtp; *p1 && *p1 != '%'; ++p1);
    238 
    239 			/* Only text in the string. */
    240 			if (!*p1) {
    241 				pr->fmt = fmtp;
    242 				pr->flags = F_TEXT;
    243 				break;
    244 			}
    245 
    246 			/*
    247 			 * Get precision for %s -- if have a byte count, don't
    248 			 * need it.
    249 			 */
    250 			if (fu->bcnt) {
    251 				sokay = USEBCNT;
    252 				/* Skip to conversion character. */
    253 				for (++p1; strchr(spec, *p1); ++p1);
    254 			} else {
    255 				/* Skip any special chars, field width. */
    256 				while (strchr(spec + 1, *++p1));
    257 				if (*p1 == '.' &&
    258 				    isdigit((unsigned char)*++p1)) {
    259 					sokay = USEPREC;
    260 					prec = atoi(p1);
    261 					while (isdigit((unsigned char)*++p1))
    262 						continue;
    263 				} else
    264 					sokay = NOTOKAY;
    265 			}
    266 
    267 			p2 = p1 + 1;		/* Set end pointer. */
    268 			cs[0] = *p1;		/* Set conversion string. */
    269 			cs[1] = '\0';
    270 
    271 			/*
    272 			 * Figure out the byte count for each conversion;
    273 			 * rewrite the format as necessary, set up blank-
    274 			 * padding for end of data.
    275 			 */
    276 			switch(cs[0]) {
    277 			case 'c':
    278 				pr->flags = F_CHAR;
    279 				switch(fu->bcnt) {
    280 				case 0: case 1:
    281 					pr->bcnt = 1;
    282 					break;
    283 				default:
    284 					p1[1] = '\0';
    285 					badcnt(p1);
    286 				}
    287 				break;
    288 			case 'd': case 'i':
    289 				pr->flags = F_INT;
    290 				goto isint;
    291 			case 'o': case 'u': case 'x': case 'X':
    292 				pr->flags = F_UINT;
    293 isint:				cs[2] = '\0';
    294 				cs[1] = cs[0];
    295 				cs[0] = 'q';
    296 				switch(fu->bcnt) {
    297 				case 0: case 4:
    298 					pr->bcnt = 4;
    299 					break;
    300 				case 1:
    301 					pr->bcnt = 1;
    302 					break;
    303 				case 2:
    304 					pr->bcnt = 2;
    305 					break;
    306 				case 8:
    307 					pr->bcnt = 8;
    308 					break;
    309 				default:
    310 					p1[1] = '\0';
    311 					badcnt(p1);
    312 				}
    313 				break;
    314 			case 'e': case 'E': case 'f': case 'g': case 'G':
    315 				pr->flags = F_DBL;
    316 				switch(fu->bcnt) {
    317 				case 0: case 8:
    318 					pr->bcnt = 8;
    319 					break;
    320 				case 4:
    321 					pr->bcnt = 4;
    322 					break;
    323 				default:
    324 					p1[1] = '\0';
    325 					badcnt(p1);
    326 				}
    327 				break;
    328 			case 's':
    329 				pr->flags = F_STR;
    330 				switch(sokay) {
    331 				case NOTOKAY:
    332 					badsfmt();
    333 				case USEBCNT:
    334 					pr->bcnt = fu->bcnt;
    335 					break;
    336 				case USEPREC:
    337 					pr->bcnt = prec;
    338 					break;
    339 				}
    340 				break;
    341 			case '_':
    342 				++p2;
    343 				switch(p1[1]) {
    344 				case 'A':
    345 					endfu = fu;
    346 					fu->flags |= F_IGNORE;
    347 					/* FALLTHROUGH */
    348 				case 'a':
    349 					pr->flags = F_ADDRESS;
    350 					++p2;
    351 					switch(p1[2]) {
    352 					case 'd': case 'o': case'x':
    353 						cs[0] = 'q';
    354 						cs[1] = p1[2];
    355 						cs[2] = '\0';
    356 						break;
    357 					default:
    358 						p1[3] = '\0';
    359 						badconv(p1);
    360 					}
    361 					break;
    362 				case 'c':
    363 					pr->flags = F_C;
    364 					/* cs[0] = 'c';	set in conv_c */
    365 					goto isint2;
    366 				case 'p':
    367 					pr->flags = F_P;
    368 					cs[0] = 'c';
    369 					goto isint2;
    370 				case 'u':
    371 					pr->flags = F_U;
    372 					/* cs[0] = 'c';	set in conv_u */
    373 isint2:					switch(fu->bcnt) {
    374 					case 0: case 1:
    375 						pr->bcnt = 1;
    376 						break;
    377 					default:
    378 						p1[2] = '\0';
    379 						badcnt(p1);
    380 					}
    381 					break;
    382 				default:
    383 					p1[2] = '\0';
    384 					badconv(p1);
    385 				}
    386 				break;
    387 			default:
    388 				p1[1] = '\0';
    389 				badconv(p1);
    390 			}
    391 
    392 			/*
    393 			 * Copy to PR format string, set conversion character
    394 			 * pointer, update original.
    395 			 */
    396 			savech = *p2;
    397 			p1[0] = '\0';
    398 			pr->fmt = emalloc(strlen(fmtp) + strlen(cs) + 1);
    399 			(void)strcpy(pr->fmt, fmtp);
    400 			(void)strcat(pr->fmt, cs);
    401 			*p2 = savech;
    402 			pr->cchar = pr->fmt + (p1 - fmtp);
    403 			fmtp = p2;
    404 
    405 			/* Only one conversion character if byte count. */
    406 			if (!(pr->flags&F_ADDRESS) && fu->bcnt && nconv++)
    407 				errx(1,
    408 			    "byte count with multiple conversion characters");
    409 		}
    410 		/*
    411 		 * If format unit byte count not specified, figure it out
    412 		 * so can adjust rep count later.
    413 		 */
    414 		if (!fu->bcnt)
    415 			for (pr = fu->nextpr; pr; pr = pr->nextpr)
    416 				fu->bcnt += pr->bcnt;
    417 	}
    418 	/*
    419 	 * If the format string interprets any data at all, and it's
    420 	 * not the same as the blocksize, and its last format unit
    421 	 * interprets any data at all, and has no iteration count,
    422 	 * repeat it as necessary.
    423 	 *
    424 	 * If, rep count is greater than 1, no trailing whitespace
    425 	 * gets output from the last iteration of the format unit.
    426 	 */
    427 	for (fu = fs->nextfu; fu; fu = fu->nextfu) {
    428 		if (!fu->nextfu && fs->bcnt < blocksize &&
    429 		    !(fu->flags&F_SETREP) && fu->bcnt)
    430 			fu->reps += (blocksize - fs->bcnt) / fu->bcnt;
    431 		if (fu->reps > 1) {
    432 			for (pr = fu->nextpr;; pr = pr->nextpr)
    433 				if (!pr->nextpr)
    434 					break;
    435 			for (p1 = pr->fmt, p2 = NULL; *p1; ++p1)
    436 				p2 = isspace((unsigned char)*p1) ? p1 : NULL;
    437 			if (p2)
    438 				pr->nospace = p2;
    439 		}
    440 	}
    441 #ifdef DEBUG
    442 	for (fu = fs->nextfu; fu; fu = fu->nextfu) {
    443 		(void)printf("fmt:");
    444 		for (pr = fu->nextpr; pr; pr = pr->nextpr)
    445 			(void)printf(" {%s}", pr->fmt);
    446 		(void)printf("\n");
    447 	}
    448 #endif
    449 }
    450 
    451 void
    452 escape(char *p1)
    453 {
    454 	char *p2;
    455 
    456 	/* alphabetic escape sequences have to be done in place */
    457 	for (p2 = p1;; ++p1, ++p2) {
    458 		if (!*p1) {
    459 			*p2 = *p1;
    460 			break;
    461 		}
    462 		if (*p1 == '\\')
    463 			switch(*++p1) {
    464 			case 'a':
    465 			     /* *p2 = '\a'; */
    466 				*p2 = '\007';
    467 				break;
    468 			case 'b':
    469 				*p2 = '\b';
    470 				break;
    471 			case 'f':
    472 				*p2 = '\f';
    473 				break;
    474 			case 'n':
    475 				*p2 = '\n';
    476 				break;
    477 			case 'r':
    478 				*p2 = '\r';
    479 				break;
    480 			case 't':
    481 				*p2 = '\t';
    482 				break;
    483 			case 'v':
    484 				*p2 = '\v';
    485 				break;
    486 			default:
    487 				*p2 = *p1;
    488 				break;
    489 			}
    490 	}
    491 }
    492 
    493 void
    494 badcnt(char *s)
    495 {
    496 	errx(1, "%s: bad byte count", s);
    497 }
    498 
    499 void
    500 badsfmt(void)
    501 {
    502 	errx(1, "%%s: requires a precision or a byte count");
    503 }
    504 
    505 void
    506 badfmt(const char *fmt)
    507 {
    508 	errx(1, "\"%s\": bad format", fmt);
    509 }
    510 
    511 void
    512 badconv(char *ch)
    513 {
    514 	errx(1, "%%%s: bad conversion character", ch);
    515 }
    516