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parse.c revision 1.12 
      1 /*	$NetBSD: parse.c,v 1.12 2001/12/07 13:37:39 bjh21 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)parse.c	8.1 (Berkeley) 6/6/93";
     40 #else
     41 __RCSID("$NetBSD: parse.c,v 1.12 2001/12/07 13:37:39 bjh21 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(name)
     62 	char *name;
     63 {
     64 	char *p;
     65 	FILE *fp;
     66 	int ch;
     67 	char buf[2048 + 1];
     68 
     69 	if ((fp = fopen(name, "r")) == NULL)
     70 		err(1, "fopen %s", name);
     71 	while (fgets(buf, sizeof(buf), fp)) {
     72 		if (!(p = strchr(buf, '\n'))) {
     73 			warnx("line too long.");
     74 			while ((ch = getchar()) != '\n' && ch != EOF);
     75 			continue;
     76 		}
     77 		*p = '\0';
     78 		for (p = buf; *p && isspace((unsigned char)*p); ++p);
     79 		if (!*p || *p == '#')
     80 			continue;
     81 		add(p);
     82 	}
     83 	(void)fclose(fp);
     84 }
     85 
     86 void
     87 add(fmt)
     88 	const char *fmt;
     89 {
     90 	const char *p;
     91 	static FS **nextfs;
     92 	FS *tfs;
     93 	FU *tfu, **nextfu;
     94 	const char *savep;
     95 
     96 	/* start new linked list of format units */
     97 	tfs = emalloc(sizeof(FS));
     98 	if (!fshead)
     99 		fshead = tfs;
    100 	else
    101 		*nextfs = tfs;
    102 	nextfs = &tfs->nextfs;
    103 	nextfu = &tfs->nextfu;
    104 
    105 	/* take the format string and break it up into format units */
    106 	for (p = fmt;;) {
    107 		/* skip leading white space */
    108 		for (; isspace((unsigned char)*p); ++p);
    109 		if (!*p)
    110 			break;
    111 
    112 		/* allocate a new format unit and link it in */
    113 		tfu = emalloc(sizeof(FU));
    114 		*nextfu = tfu;
    115 		nextfu = &tfu->nextfu;
    116 		tfu->reps = 1;
    117 
    118 		/* if leading digit, repetition count */
    119 		if (isdigit((unsigned char)*p)) {
    120 			for (savep = p; isdigit((unsigned char)*p); ++p);
    121 			if (!isspace((unsigned char)*p) && *p != '/')
    122 				badfmt(fmt);
    123 			/* may overwrite either white space or slash */
    124 			tfu->reps = atoi(savep);
    125 			tfu->flags = F_SETREP;
    126 			/* skip trailing white space */
    127 			for (++p; isspace((unsigned char)*p); ++p);
    128 		}
    129 
    130 		/* skip slash and trailing white space */
    131 		if (*p == '/')
    132 			while (isspace((unsigned char)*++p));
    133 
    134 		/* byte count */
    135 		if (isdigit((unsigned char)*p)) {
    136 			for (savep = p; isdigit((unsigned char)*p); ++p);
    137 			if (!isspace((unsigned char)*p))
    138 				badfmt(fmt);
    139 			tfu->bcnt = atoi(savep);
    140 			/* skip trailing white space */
    141 			for (++p; isspace((unsigned char)*p); ++p);
    142 		}
    143 
    144 		/* format */
    145 		if (*p != '"')
    146 			badfmt(fmt);
    147 		for (savep = ++p; *p != '"';)
    148 			if (*p++ == 0)
    149 				badfmt(fmt);
    150 		if (!(tfu->fmt = malloc(p - savep + 1)))
    151 			nomem();
    152 		(void) strncpy(tfu->fmt, savep, p - savep);
    153 		tfu->fmt[p - savep] = '\0';
    154 		escape(tfu->fmt);
    155 		p++;
    156 	}
    157 }
    158 
    159 static const char *spec = ".#-+ 0123456789";
    160 
    161 int
    162 size(fs)
    163 	FS *fs;
    164 {
    165 	FU *fu;
    166 	int bcnt, cursize;
    167 	char *fmt;
    168 	int prec;
    169 
    170 	/* figure out the data block size needed for each format unit */
    171 	for (cursize = 0, fu = fs->nextfu; fu; fu = fu->nextfu) {
    172 		if (fu->bcnt) {
    173 			cursize += fu->bcnt * fu->reps;
    174 			continue;
    175 		}
    176 		for (bcnt = prec = 0, fmt = fu->fmt; *fmt; ++fmt) {
    177 			if (*fmt != '%')
    178 				continue;
    179 			/*
    180 			 * skip any special chars -- save precision in
    181 			 * case it's a %s format.
    182 			 */
    183 			while (strchr(spec + 1, *++fmt));
    184 			if (*fmt == '.' && isdigit((unsigned char)*++fmt)) {
    185 				prec = atoi(fmt);
    186 				while (isdigit((unsigned char)*++fmt));
    187 			}
    188 			switch(*fmt) {
    189 			case 'c':
    190 				bcnt += 1;
    191 				break;
    192 			case 'd': case 'i': case 'o': case 'u':
    193 			case 'x': case 'X':
    194 				bcnt += 4;
    195 				break;
    196 			case 'e': case 'E': case 'f': case 'g': case 'G':
    197 				bcnt += 8;
    198 				break;
    199 			case 's':
    200 				bcnt += prec;
    201 				break;
    202 			case '_':
    203 				switch(*++fmt) {
    204 				case 'c': case 'p': case 'u':
    205 					bcnt += 1;
    206 					break;
    207 				}
    208 			}
    209 		}
    210 		cursize += bcnt * fu->reps;
    211 	}
    212 	return (cursize);
    213 }
    214 
    215 void
    216 rewrite(fs)
    217 	FS *fs;
    218 {
    219 	enum { NOTOKAY, USEBCNT, USEPREC } sokay;
    220 	PR *pr, **nextpr;
    221 	FU *fu;
    222 	char *p1, *p2;
    223 	char savech, *fmtp, cs[3];
    224 	int nconv, prec;
    225 
    226 	nextpr = NULL;
    227 	prec = 0;
    228 	for (fu = fs->nextfu; fu; fu = fu->nextfu) {
    229 		/*
    230 		 * Break each format unit into print units; each conversion
    231 		 * character gets its own.
    232 		 */
    233 		for (nconv = 0, fmtp = fu->fmt; *fmtp; nextpr = &pr->nextpr) {
    234 			pr = emalloc(sizeof(PR));
    235 			if (!fu->nextpr)
    236 				fu->nextpr = pr;
    237 			else
    238 				*nextpr = pr;
    239 
    240 			/* Skip preceding text and up to the next % sign. */
    241 			for (p1 = fmtp; *p1 && *p1 != '%'; ++p1);
    242 
    243 			/* Only text in the string. */
    244 			if (!*p1) {
    245 				pr->fmt = fmtp;
    246 				pr->flags = F_TEXT;
    247 				break;
    248 			}
    249 
    250 			/*
    251 			 * Get precision for %s -- if have a byte count, don't
    252 			 * need it.
    253 			 */
    254 			if (fu->bcnt) {
    255 				sokay = USEBCNT;
    256 				/* Skip to conversion character. */
    257 				for (++p1; strchr(spec, *p1); ++p1);
    258 			} else {
    259 				/* Skip any special chars, field width. */
    260 				while (strchr(spec + 1, *++p1));
    261 				if (*p1 == '.' &&
    262 				    isdigit((unsigned char)*++p1)) {
    263 					sokay = USEPREC;
    264 					prec = atoi(p1);
    265 					while (isdigit((unsigned char)*++p1))
    266 						continue;
    267 				} else
    268 					sokay = NOTOKAY;
    269 			}
    270 
    271 			p2 = p1 + 1;		/* Set end pointer. */
    272 			cs[0] = *p1;		/* Set conversion string. */
    273 			cs[1] = '\0';
    274 
    275 			/*
    276 			 * Figure out the byte count for each conversion;
    277 			 * rewrite the format as necessary, set up blank-
    278 			 * padding for end of data.
    279 			 */
    280 			switch(cs[0]) {
    281 			case 'c':
    282 				pr->flags = F_CHAR;
    283 				switch(fu->bcnt) {
    284 				case 0: case 1:
    285 					pr->bcnt = 1;
    286 					break;
    287 				default:
    288 					p1[1] = '\0';
    289 					badcnt(p1);
    290 				}
    291 				break;
    292 			case 'd': case 'i':
    293 				pr->flags = F_INT;
    294 				goto isint;
    295 			case 'o': case 'u': case 'x': case 'X':
    296 				pr->flags = F_UINT;
    297 isint:				cs[2] = '\0';
    298 				cs[1] = cs[0];
    299 				cs[0] = 'q';
    300 				switch(fu->bcnt) {
    301 				case 0: case 4:
    302 					pr->bcnt = 4;
    303 					break;
    304 				case 1:
    305 					pr->bcnt = 1;
    306 					break;
    307 				case 2:
    308 					pr->bcnt = 2;
    309 					break;
    310 				case 8:
    311 					pr->bcnt = 8;
    312 					break;
    313 				default:
    314 					p1[1] = '\0';
    315 					badcnt(p1);
    316 				}
    317 				break;
    318 			case 'e': case 'E': case 'f': case 'g': case 'G':
    319 				pr->flags = F_DBL;
    320 				switch(fu->bcnt) {
    321 				case 0: case 8:
    322 					pr->bcnt = 8;
    323 					break;
    324 				case 4:
    325 					pr->bcnt = 4;
    326 					break;
    327 				default:
    328 					p1[1] = '\0';
    329 					badcnt(p1);
    330 				}
    331 				break;
    332 			case 's':
    333 				pr->flags = F_STR;
    334 				switch(sokay) {
    335 				case NOTOKAY:
    336 					badsfmt();
    337 				case USEBCNT:
    338 					pr->bcnt = fu->bcnt;
    339 					break;
    340 				case USEPREC:
    341 					pr->bcnt = prec;
    342 					break;
    343 				}
    344 				break;
    345 			case '_':
    346 				++p2;
    347 				switch(p1[1]) {
    348 				case 'A':
    349 					endfu = fu;
    350 					fu->flags |= F_IGNORE;
    351 					/* FALLTHROUGH */
    352 				case 'a':
    353 					pr->flags = F_ADDRESS;
    354 					++p2;
    355 					switch(p1[2]) {
    356 					case 'd': case 'o': case'x':
    357 						cs[0] = 'q';
    358 						cs[1] = p1[2];
    359 						cs[2] = '\0';
    360 						break;
    361 					default:
    362 						p1[3] = '\0';
    363 						badconv(p1);
    364 					}
    365 					break;
    366 				case 'c':
    367 					pr->flags = F_C;
    368 					/* cs[0] = 'c';	set in conv_c */
    369 					goto isint2;
    370 				case 'p':
    371 					pr->flags = F_P;
    372 					cs[0] = 'c';
    373 					goto isint2;
    374 				case 'u':
    375 					pr->flags = F_U;
    376 					/* cs[0] = 'c';	set in conv_u */
    377 isint2:					switch(fu->bcnt) {
    378 					case 0: case 1:
    379 						pr->bcnt = 1;
    380 						break;
    381 					default:
    382 						p1[2] = '\0';
    383 						badcnt(p1);
    384 					}
    385 					break;
    386 				default:
    387 					p1[2] = '\0';
    388 					badconv(p1);
    389 				}
    390 				break;
    391 			default:
    392 				p1[1] = '\0';
    393 				badconv(p1);
    394 			}
    395 
    396 			/*
    397 			 * Copy to PR format string, set conversion character
    398 			 * pointer, update original.
    399 			 */
    400 			savech = *p2;
    401 			p1[0] = '\0';
    402 			pr->fmt = emalloc(strlen(fmtp) + strlen(cs) + 1);
    403 			(void)strcpy(pr->fmt, fmtp);
    404 			(void)strcat(pr->fmt, cs);
    405 			*p2 = savech;
    406 			pr->cchar = pr->fmt + (p1 - fmtp);
    407 			fmtp = p2;
    408 
    409 			/* Only one conversion character if byte count. */
    410 			if (!(pr->flags&F_ADDRESS) && fu->bcnt && nconv++)
    411 				errx(1,
    412 			    "byte count with multiple conversion characters");
    413 		}
    414 		/*
    415 		 * If format unit byte count not specified, figure it out
    416 		 * so can adjust rep count later.
    417 		 */
    418 		if (!fu->bcnt)
    419 			for (pr = fu->nextpr; pr; pr = pr->nextpr)
    420 				fu->bcnt += pr->bcnt;
    421 	}
    422 	/*
    423 	 * If the format string interprets any data at all, and it's
    424 	 * not the same as the blocksize, and its last format unit
    425 	 * interprets any data at all, and has no iteration count,
    426 	 * repeat it as necessary.
    427 	 *
    428 	 * If, rep count is greater than 1, no trailing whitespace
    429 	 * gets output from the last iteration of the format unit.
    430 	 */
    431 	for (fu = fs->nextfu; fu; fu = fu->nextfu) {
    432 		if (!fu->nextfu && fs->bcnt < blocksize &&
    433 		    !(fu->flags&F_SETREP) && fu->bcnt)
    434 			fu->reps += (blocksize - fs->bcnt) / fu->bcnt;
    435 		if (fu->reps > 1) {
    436 			for (pr = fu->nextpr;; pr = pr->nextpr)
    437 				if (!pr->nextpr)
    438 					break;
    439 			for (p1 = pr->fmt, p2 = NULL; *p1; ++p1)
    440 				p2 = isspace((unsigned char)*p1) ? p1 : NULL;
    441 			if (p2)
    442 				pr->nospace = p2;
    443 		}
    444 	}
    445 #ifdef DEBUG
    446 	for (fu = fs->nextfu; fu; fu = fu->nextfu) {
    447 		(void)printf("fmt:");
    448 		for (pr = fu->nextpr; pr; pr = pr->nextpr)
    449 			(void)printf(" {%s}", pr->fmt);
    450 		(void)printf("\n");
    451 	}
    452 #endif
    453 }
    454 
    455 void
    456 escape(p1)
    457 	char *p1;
    458 {
    459 	char *p2;
    460 
    461 	/* alphabetic escape sequences have to be done in place */
    462 	for (p2 = p1;; ++p1, ++p2) {
    463 		if (!*p1) {
    464 			*p2 = *p1;
    465 			break;
    466 		}
    467 		if (*p1 == '\\')
    468 			switch(*++p1) {
    469 			case 'a':
    470 			     /* *p2 = '\a'; */
    471 				*p2 = '\007';
    472 				break;
    473 			case 'b':
    474 				*p2 = '\b';
    475 				break;
    476 			case 'f':
    477 				*p2 = '\f';
    478 				break;
    479 			case 'n':
    480 				*p2 = '\n';
    481 				break;
    482 			case 'r':
    483 				*p2 = '\r';
    484 				break;
    485 			case 't':
    486 				*p2 = '\t';
    487 				break;
    488 			case 'v':
    489 				*p2 = '\v';
    490 				break;
    491 			default:
    492 				*p2 = *p1;
    493 				break;
    494 			}
    495 	}
    496 }
    497 
    498 void
    499 badcnt(s)
    500 	char *s;
    501 {
    502 	errx(1, "%s: bad byte count", s);
    503 }
    504 
    505 void
    506 badsfmt()
    507 {
    508 	errx(1, "%%s: requires a precision or a byte count\n");
    509 }
    510 
    511 void
    512 badfmt(fmt)
    513 	const char *fmt;
    514 {
    515 	errx(1, "\"%s\": bad format\n", fmt);
    516 }
    517 
    518 void
    519 badconv(ch)
    520 	char *ch;
    521 {
    522 	errx(1, "%%%s: bad conversion character\n", ch);
    523 }
    524