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display.c revision 1.18 
      1 /*	$NetBSD: display.c,v 1.18 2003/10/27 00:12:43 lukem 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[] = "@(#)display.c	8.1 (Berkeley) 6/6/93";
     40 #else
     41 __RCSID("$NetBSD: display.c,v 1.18 2003/10/27 00:12:43 lukem Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/stat.h>
     47 
     48 #include <ctype.h>
     49 #include <err.h>
     50 #include <errno.h>
     51 #include <inttypes.h>
     52 #include <stdio.h>
     53 #include <stdlib.h>
     54 #include <string.h>
     55 #include <unistd.h>
     56 
     57 #include "hexdump.h"
     58 
     59 enum _vflag vflag = FIRST;
     60 
     61 static off_t address;			/* address/offset in stream */
     62 static off_t eaddress;			/* end address */
     63 
     64 static inline void print __P((PR *, u_char *));
     65 
     66 void
     67 display()
     68 {
     69 	FS *fs;
     70 	FU *fu;
     71 	PR *pr;
     72 	int cnt;
     73 	u_char *bp;
     74 	off_t saveaddress;
     75 	u_char savech, *savebp;
     76 
     77 	savech = 0;
     78 	while ((bp = get()) != NULL)
     79 	    for (fs = fshead, savebp = bp, saveaddress = address; fs;
     80 		fs = fs->nextfs, bp = savebp, address = saveaddress)
     81 		    for (fu = fs->nextfu; fu; fu = fu->nextfu) {
     82 			if (fu->flags&F_IGNORE)
     83 				break;
     84 			for (cnt = fu->reps; cnt; --cnt)
     85 			    for (pr = fu->nextpr; pr; address += pr->bcnt,
     86 				bp += pr->bcnt, pr = pr->nextpr) {
     87 				    if (eaddress && address >= eaddress &&
     88 					!(pr->flags & (F_TEXT|F_BPAD)))
     89 					    bpad(pr);
     90 				    if (cnt == 1 && pr->nospace) {
     91 					savech = *pr->nospace;
     92 					*pr->nospace = '\0';
     93 				    }
     94 				    print(pr, bp);
     95 				    if (cnt == 1 && pr->nospace)
     96 					*pr->nospace = savech;
     97 			    }
     98 		    }
     99 	if (endfu) {
    100 		/*
    101 		 * If eaddress not set, error or file size was multiple of
    102 		 * blocksize, and no partial block ever found.
    103 		 */
    104 		if (!eaddress) {
    105 			if (!address)
    106 				return;
    107 			eaddress = address;
    108 		}
    109 		for (pr = endfu->nextpr; pr; pr = pr->nextpr)
    110 			switch(pr->flags) {
    111 			case F_ADDRESS:
    112 				(void)printf(pr->fmt, (int64_t)eaddress);
    113 				break;
    114 			case F_TEXT:
    115 				(void)printf("%s", pr->fmt);
    116 				break;
    117 			}
    118 	}
    119 }
    120 
    121 static inline void
    122 print(pr, bp)
    123 	PR *pr;
    124 	u_char *bp;
    125 {
    126 	   double f8;
    127 	    float f4;
    128 	  int16_t s2;
    129 	  int32_t s4;
    130 	  int64_t s8;
    131 	u_int16_t u2;
    132 	u_int32_t u4;
    133 	u_int64_t u8;
    134 
    135 	switch(pr->flags) {
    136 	case F_ADDRESS:
    137 		(void)printf(pr->fmt, (int64_t)address);
    138 		break;
    139 	case F_BPAD:
    140 		(void)printf(pr->fmt, "");
    141 		break;
    142 	case F_C:
    143 		conv_c(pr, bp);
    144 		break;
    145 	case F_CHAR:
    146 		(void)printf(pr->fmt, *bp);
    147 		break;
    148 	case F_DBL:
    149 		switch(pr->bcnt) {
    150 		case 4:
    151 			memmove(&f4, bp, sizeof(f4));
    152 			(void)printf(pr->fmt, f4);
    153 			break;
    154 		case 8:
    155 			memmove(&f8, bp, sizeof(f8));
    156 			(void)printf(pr->fmt, f8);
    157 			break;
    158 		}
    159 		break;
    160 	case F_INT:
    161 		switch(pr->bcnt) {
    162 		case 1:
    163 			(void)printf(pr->fmt, (int64_t)*bp);
    164 			break;
    165 		case 2:
    166 			memmove(&s2, bp, sizeof(s2));
    167 			(void)printf(pr->fmt, (int64_t)s2);
    168 			break;
    169 		case 4:
    170 			memmove(&s4, bp, sizeof(s4));
    171 			(void)printf(pr->fmt, (int64_t)s4);
    172 			break;
    173 		case 8:
    174 			memmove(&s8, bp, sizeof(s8));
    175 			(void)printf(pr->fmt, s8);
    176 			break;
    177 		}
    178 		break;
    179 	case F_P:
    180 		(void)printf(pr->fmt, isprint(*bp) ? *bp : '.');
    181 		break;
    182 	case F_STR:
    183 		(void)printf(pr->fmt, (char *)bp);
    184 		break;
    185 	case F_TEXT:
    186 		(void)printf("%s", pr->fmt);
    187 		break;
    188 	case F_U:
    189 		conv_u(pr, bp);
    190 		break;
    191 	case F_UINT:
    192 		switch(pr->bcnt) {
    193 		case 1:
    194 			(void)printf(pr->fmt, (uint64_t)*bp);
    195 			break;
    196 		case 2:
    197 			memmove(&u2, bp, sizeof(u2));
    198 			(void)printf(pr->fmt, (uint64_t)u2);
    199 			break;
    200 		case 4:
    201 			memmove(&u4, bp, sizeof(u4));
    202 			(void)printf(pr->fmt, (uint64_t)u4);
    203 			break;
    204 		case 8:
    205 			memmove(&u8, bp, sizeof(u8));
    206 			(void)printf(pr->fmt, u8);
    207 			break;
    208 		}
    209 		break;
    210 	}
    211 }
    212 
    213 void
    214 bpad(pr)
    215 	PR *pr;
    216 {
    217 	static const char *spec = " -0+#";
    218 	char *p1, *p2;
    219 
    220 	/*
    221 	 * Remove all conversion flags; '-' is the only one valid
    222 	 * with %s, and it's not useful here.
    223 	 */
    224 	pr->flags = F_BPAD;
    225 	pr->cchar[0] = 's';
    226 	pr->cchar[1] = '\0';
    227 	for (p1 = pr->fmt; *p1 != '%'; ++p1);
    228 	for (p2 = ++p1; *p1 && strchr(spec, *p1); ++p1);
    229 	while ((*p2++ = *p1++) != '\0');
    230 }
    231 
    232 static char **_argv;
    233 
    234 u_char *
    235 get()
    236 {
    237 	static int ateof = 1;
    238 	static u_char *curp, *savp;
    239 	int n;
    240 	int need, nread;
    241 	u_char *tmpp;
    242 
    243 	if (!curp) {
    244 		curp = emalloc(blocksize);
    245 		savp = emalloc(blocksize);
    246 	} else {
    247 		tmpp = curp;
    248 		curp = savp;
    249 		savp = tmpp;
    250 		address += blocksize;
    251 	}
    252 	for (need = blocksize, nread = 0;;) {
    253 		/*
    254 		 * if read the right number of bytes, or at EOF for one file,
    255 		 * and no other files are available, zero-pad the rest of the
    256 		 * block and set the end flag.
    257 		 */
    258 		if (!length || (ateof && !next(NULL))) {
    259 			if (need == blocksize)
    260 				return(NULL);
    261 			if (!need && vflag != ALL &&
    262 			    !memcmp(curp, savp, nread)) {
    263 				if (vflag != DUP)
    264 					(void)printf("*\n");
    265 				return(NULL);
    266 			}
    267 			memset((char *)curp + nread, 0, need);
    268 			eaddress = address + nread;
    269 			return(curp);
    270 		}
    271 		n = fread((char *)curp + nread, sizeof(u_char),
    272 		    length == -1 ? need : MIN(length, need), stdin);
    273 		if (!n) {
    274 			if (ferror(stdin))
    275 				warn("%s", _argv[-1]);
    276 			ateof = 1;
    277 			continue;
    278 		}
    279 		ateof = 0;
    280 		if (length != -1)
    281 			length -= n;
    282 		if (!(need -= n)) {
    283 			if (vflag == ALL || vflag == FIRST ||
    284 			    memcmp(curp, savp, blocksize)) {
    285 				if (vflag == DUP || vflag == FIRST)
    286 					vflag = WAIT;
    287 				return(curp);
    288 			}
    289 			if (vflag == WAIT)
    290 				(void)printf("*\n");
    291 			vflag = DUP;
    292 			address += blocksize;
    293 			need = blocksize;
    294 			nread = 0;
    295 		}
    296 		else
    297 			nread += n;
    298 	}
    299 }
    300 
    301 int
    302 next(argv)
    303 	char **argv;
    304 {
    305 	static int done;
    306 	int statok;
    307 
    308 	if (argv) {
    309 		_argv = argv;
    310 		return(1);
    311 	}
    312 	for (;;) {
    313 		if (*_argv) {
    314 			if (!(freopen(*_argv, "r", stdin))) {
    315 				warn("%s", *_argv);
    316 				exitval = 1;
    317 				++_argv;
    318 				continue;
    319 			}
    320 			statok = done = 1;
    321 		} else {
    322 			if (done++)
    323 				return(0);
    324 			statok = 0;
    325 		}
    326 		if (skip)
    327 			doskip(statok ? *_argv : "stdin", statok);
    328 		if (*_argv)
    329 			++_argv;
    330 		if (!skip)
    331 			return(1);
    332 	}
    333 	/* NOTREACHED */
    334 }
    335 
    336 void
    337 doskip(fname, statok)
    338 	const char *fname;
    339 	int statok;
    340 {
    341 	int cnt;
    342 	struct stat sb;
    343 
    344 	if (statok) {
    345 		if (fstat(fileno(stdin), &sb))
    346 			err(1, "fstat %s", fname);
    347 		if (S_ISREG(sb.st_mode) && skip >= sb.st_size) {
    348 			address += sb.st_size;
    349 			skip -= sb.st_size;
    350 			return;
    351 		}
    352 	}
    353 	if (S_ISREG(sb.st_mode)) {
    354 		if (fseek(stdin, skip, SEEK_SET))
    355 			err(1, "fseek %s", fname);
    356 		address += skip;
    357 		skip = 0;
    358 	} else {
    359 		for (cnt = 0; cnt < skip; ++cnt)
    360 			if (getchar() == EOF)
    361 				break;
    362 		address += cnt;
    363 		skip -= cnt;
    364 	}
    365 }
    366 
    367 void *
    368 emalloc(allocsize)
    369 	int allocsize;
    370 {
    371 	void *p;
    372 
    373 	if ((p = malloc((u_int)allocsize)) == NULL)
    374 		nomem();
    375 	memset(p, 0, allocsize);
    376 	return(p);
    377 }
    378 
    379 void
    380 nomem()
    381 {
    382 	err(1, NULL);
    383 }
    384