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display.c revision 1.20 
      1 /*	$NetBSD: display.c,v 1.20 2006/08/26 18:17:42 christos 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 1.20 2006/08/26 18:17:42 christos 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 #include <util.h>
     57 
     58 #include "hexdump.h"
     59 
     60 enum _vflag vflag = FIRST;
     61 
     62 static off_t address;			/* address/offset in stream */
     63 static off_t eaddress;			/* end address */
     64 
     65 static inline void print(PR *, u_char *);
     66 
     67 void
     68 display(void)
     69 {
     70 	FS *fs;
     71 	FU *fu;
     72 	PR *pr;
     73 	int cnt;
     74 	u_char *bp;
     75 	off_t saveaddress;
     76 	u_char savech, *savebp;
     77 
     78 	savech = 0;
     79 	while ((bp = get()) != NULL)
     80 	    for (fs = fshead, savebp = bp, saveaddress = address; fs;
     81 		fs = fs->nextfs, bp = savebp, address = saveaddress)
     82 		    for (fu = fs->nextfu; fu; fu = fu->nextfu) {
     83 			if (fu->flags&F_IGNORE)
     84 				break;
     85 			for (cnt = fu->reps; cnt; --cnt)
     86 			    for (pr = fu->nextpr; pr; address += pr->bcnt,
     87 				bp += pr->bcnt, pr = pr->nextpr) {
     88 				    if (eaddress && address >= eaddress &&
     89 					!(pr->flags & (F_TEXT|F_BPAD)))
     90 					    bpad(pr);
     91 				    if (cnt == 1 && pr->nospace) {
     92 					savech = *pr->nospace;
     93 					*pr->nospace = '\0';
     94 				    }
     95 				    print(pr, bp);
     96 				    if (cnt == 1 && pr->nospace)
     97 					*pr->nospace = savech;
     98 			    }
     99 		    }
    100 	if (endfu) {
    101 		/*
    102 		 * If eaddress not set, error or file size was multiple of
    103 		 * blocksize, and no partial block ever found.
    104 		 */
    105 		if (!eaddress) {
    106 			if (!address)
    107 				return;
    108 			eaddress = address;
    109 		}
    110 		for (pr = endfu->nextpr; pr; pr = pr->nextpr)
    111 			switch(pr->flags) {
    112 			case F_ADDRESS:
    113 				(void)printf(pr->fmt, (int64_t)eaddress);
    114 				break;
    115 			case F_TEXT:
    116 				(void)printf("%s", pr->fmt);
    117 				break;
    118 			}
    119 	}
    120 }
    121 
    122 static inline void
    123 print(PR *pr, u_char *bp)
    124 {
    125 	   double f8;
    126 	    float f4;
    127 	  int16_t s2;
    128 	  int32_t s4;
    129 	  int64_t s8;
    130 	u_int16_t u2;
    131 	u_int32_t u4;
    132 	u_int64_t u8;
    133 
    134 	switch(pr->flags) {
    135 	case F_ADDRESS:
    136 		(void)printf(pr->fmt, (int64_t)address);
    137 		break;
    138 	case F_BPAD:
    139 		(void)printf(pr->fmt, "");
    140 		break;
    141 	case F_C:
    142 		conv_c(pr, bp);
    143 		break;
    144 	case F_CHAR:
    145 		(void)printf(pr->fmt, *bp);
    146 		break;
    147 	case F_DBL:
    148 		switch(pr->bcnt) {
    149 		case 4:
    150 			memmove(&f4, bp, sizeof(f4));
    151 			(void)printf(pr->fmt, f4);
    152 			break;
    153 		case 8:
    154 			memmove(&f8, bp, sizeof(f8));
    155 			(void)printf(pr->fmt, f8);
    156 			break;
    157 		}
    158 		break;
    159 	case F_INT:
    160 		switch(pr->bcnt) {
    161 		case 1:
    162 			(void)printf(pr->fmt, (int64_t)*bp);
    163 			break;
    164 		case 2:
    165 			memmove(&s2, bp, sizeof(s2));
    166 			(void)printf(pr->fmt, (int64_t)s2);
    167 			break;
    168 		case 4:
    169 			memmove(&s4, bp, sizeof(s4));
    170 			(void)printf(pr->fmt, (int64_t)s4);
    171 			break;
    172 		case 8:
    173 			memmove(&s8, bp, sizeof(s8));
    174 			(void)printf(pr->fmt, s8);
    175 			break;
    176 		}
    177 		break;
    178 	case F_P:
    179 		(void)printf(pr->fmt, isprint(*bp) ? *bp : '.');
    180 		break;
    181 	case F_STR:
    182 		(void)printf(pr->fmt, (char *)bp);
    183 		break;
    184 	case F_TEXT:
    185 		(void)printf("%s", pr->fmt);
    186 		break;
    187 	case F_U:
    188 		conv_u(pr, bp);
    189 		break;
    190 	case F_UINT:
    191 		switch(pr->bcnt) {
    192 		case 1:
    193 			(void)printf(pr->fmt, (uint64_t)*bp);
    194 			break;
    195 		case 2:
    196 			memmove(&u2, bp, sizeof(u2));
    197 			(void)printf(pr->fmt, (uint64_t)u2);
    198 			break;
    199 		case 4:
    200 			memmove(&u4, bp, sizeof(u4));
    201 			(void)printf(pr->fmt, (uint64_t)u4);
    202 			break;
    203 		case 8:
    204 			memmove(&u8, bp, sizeof(u8));
    205 			(void)printf(pr->fmt, u8);
    206 			break;
    207 		}
    208 		break;
    209 	}
    210 }
    211 
    212 void
    213 bpad(PR *pr)
    214 {
    215 	static const char *spec = " -0+#";
    216 	char *p1, *p2;
    217 
    218 	/*
    219 	 * Remove all conversion flags; '-' is the only one valid
    220 	 * with %s, and it's not useful here.
    221 	 */
    222 	pr->flags = F_BPAD;
    223 	pr->cchar[0] = 's';
    224 	pr->cchar[1] = '\0';
    225 	for (p1 = pr->fmt; *p1 != '%'; ++p1);
    226 	for (p2 = ++p1; *p1 && strchr(spec, *p1); ++p1);
    227 	while ((*p2++ = *p1++) != '\0');
    228 }
    229 
    230 static char **_argv;
    231 
    232 u_char *
    233 get(void)
    234 {
    235 	static int ateof = 1;
    236 	static u_char *curp, *savp;
    237 	int n;
    238 	int need, nread;
    239 	u_char *tmpp;
    240 
    241 	if (!curp) {
    242 		curp = ecalloc(blocksize, 1);
    243 		savp = ecalloc(blocksize, 1);
    244 	} else {
    245 		tmpp = curp;
    246 		curp = savp;
    247 		savp = tmpp;
    248 		address += blocksize;
    249 	}
    250 	for (need = blocksize, nread = 0;;) {
    251 		/*
    252 		 * if read the right number of bytes, or at EOF for one file,
    253 		 * and no other files are available, zero-pad the rest of the
    254 		 * block and set the end flag.
    255 		 */
    256 		if (!length || (ateof && !next(NULL))) {
    257 			if (need == blocksize)
    258 				return(NULL);
    259 			if (!need && vflag != ALL &&
    260 			    !memcmp(curp, savp, nread)) {
    261 				if (vflag != DUP)
    262 					(void)printf("*\n");
    263 				return(NULL);
    264 			}
    265 			memset((char *)curp + nread, 0, need);
    266 			eaddress = address + nread;
    267 			return(curp);
    268 		}
    269 		n = fread((char *)curp + nread, sizeof(u_char),
    270 		    length == -1 ? need : MIN(length, need), stdin);
    271 		if (!n) {
    272 			if (ferror(stdin))
    273 				warn("%s", _argv[-1]);
    274 			ateof = 1;
    275 			continue;
    276 		}
    277 		ateof = 0;
    278 		if (length != -1)
    279 			length -= n;
    280 		if (!(need -= n)) {
    281 			if (vflag == ALL || vflag == FIRST ||
    282 			    memcmp(curp, savp, blocksize)) {
    283 				if (vflag == DUP || vflag == FIRST)
    284 					vflag = WAIT;
    285 				return(curp);
    286 			}
    287 			if (vflag == WAIT)
    288 				(void)printf("*\n");
    289 			vflag = DUP;
    290 			address += blocksize;
    291 			need = blocksize;
    292 			nread = 0;
    293 		}
    294 		else
    295 			nread += n;
    296 	}
    297 }
    298 
    299 int
    300 next(char **argv)
    301 {
    302 	static int done;
    303 	int statok;
    304 
    305 	if (argv) {
    306 		_argv = argv;
    307 		return(1);
    308 	}
    309 	for (;;) {
    310 		if (*_argv) {
    311 			if (!(freopen(*_argv, "r", stdin))) {
    312 				warn("%s", *_argv);
    313 				exitval = 1;
    314 				++_argv;
    315 				continue;
    316 			}
    317 			statok = done = 1;
    318 		} else {
    319 			if (done++)
    320 				return(0);
    321 			statok = 0;
    322 		}
    323 		if (skip)
    324 			doskip(statok ? *_argv : "stdin", statok);
    325 		if (*_argv)
    326 			++_argv;
    327 		if (!skip)
    328 			return(1);
    329 	}
    330 	/* NOTREACHED */
    331 }
    332 
    333 void
    334 doskip(const char *fname, int statok)
    335 {
    336 	int cnt;
    337 	struct stat sb;
    338 
    339 	if (statok) {
    340 		if (fstat(fileno(stdin), &sb))
    341 			err(1, "fstat %s", fname);
    342 		if (S_ISREG(sb.st_mode) && skip >= sb.st_size) {
    343 			address += sb.st_size;
    344 			skip -= sb.st_size;
    345 			return;
    346 		}
    347 	}
    348 	if (S_ISREG(sb.st_mode)) {
    349 		if (fseek(stdin, skip, SEEK_SET))
    350 			err(1, "fseek %s", fname);
    351 		address += skip;
    352 		skip = 0;
    353 	} else {
    354 		for (cnt = 0; cnt < skip; ++cnt)
    355 			if (getchar() == EOF)
    356 				break;
    357 		address += cnt;
    358 		skip -= cnt;
    359 	}
    360 }
    361