summaryrefslogtreecommitdiffstats
path: root/text-utils/hexdump-display.c
blob: 695b4724b5607310ed7f8fbf82b1afb549f29da6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "hexdump.h"
#include "xalloc.h"
#include "c.h"
#include "nls.h"
#include "colors.h"

static void doskip(const char *, int, struct hexdump *);
static u_char *get(struct hexdump *);

enum _vflag vflag = FIRST;

static off_t address;			/* address/offset in stream */
static off_t eaddress;			/* end address */

static const char *color_cond(struct hexdump_pr *pr, unsigned char *bp, int bcnt)
{
	register struct list_head *p;
	register struct hexdump_clr *clr;
	off_t offt;
	int match;

	list_for_each(p, pr->colorlist) {
		clr = list_entry(p, struct hexdump_clr, colorlist);
		offt = clr->offt;
		match = 0;

		/* no offset or offset outside this print unit */
		if (offt < 0)
			offt = address;
		if (offt < address || offt + clr->range > address + bcnt)
			continue;

		/* match a string */
		if (clr->str) {
			if (pr->flags == F_ADDRESS) {
				/* TODO */
			}
			else if (!strncmp(clr->str, (char *)bp + offt
				- address, clr->range))
				match = 1;
		/* match a value */
		} else if (clr->val != -1) {
			int val = 0;
			/* addresses are not part of the input, so we can't
			 * compare with the contents of bp */
			if (pr->flags == F_ADDRESS) {
				if (clr->val == address)
					match = 1;
			} else {
				memcpy(&val, bp + offt - address, clr->range);
				if (val == clr->val)
					match = 1;
			}
		/* no conditions, only a color was specified */
		} else
			return clr->fmt;

		/* return the format string or check for another */
		if (match ^ clr->invert)
			return clr->fmt;
	}

	/* no match */
	return NULL;
}

static inline void
print(struct hexdump_pr *pr, unsigned char *bp) {

	const char *color = NULL;

	if (pr->colorlist && (color = color_cond(pr, bp, pr->bcnt)))
		color_enable(color);

	switch(pr->flags) {
	case F_ADDRESS:
		printf(pr->fmt, address);
		break;
	case F_BPAD:
		printf(pr->fmt, "");
		break;
	case F_C:
		conv_c(pr, bp);
		break;
	case F_CHAR:
		printf(pr->fmt, *bp);
		break;
	case F_DBL:
	    {
		double dval;
		float fval;
		switch(pr->bcnt) {
		case 4:
			memmove(&fval, bp, sizeof(fval));
			printf(pr->fmt, fval);
			break;
		case 8:
			memmove(&dval, bp, sizeof(dval));
			printf(pr->fmt, dval);
			break;
		}
		break;
	    }
	case F_INT:
	    {
		short sval;	/* int16_t */
		int ival;	/* int32_t */
		long long Lval;	/* int64_t, int64_t */

		switch(pr->bcnt) {
		case 1:
			printf(pr->fmt, (unsigned long long) *bp);
			break;
		case 2:
			memmove(&sval, bp, sizeof(sval));
			printf(pr->fmt, (unsigned long long) sval);
			break;
		case 4:
			memmove(&ival, bp, sizeof(ival));
			printf(pr->fmt, (unsigned long long) ival);
			break;
		case 8:
			memmove(&Lval, bp, sizeof(Lval));
			printf(pr->fmt, Lval);
			break;
		}
		break;
	    }
	case F_P:
		printf(pr->fmt, isprint(*bp) ? *bp : '.');
		break;
	case F_STR:
		printf(pr->fmt, (char *)bp);
		break;
	case F_TEXT:
		printf("%s", pr->fmt);
		break;
	case F_U:
		conv_u(pr, bp);
		break;
	case F_UINT:
	    {
		unsigned short sval;	/* u_int16_t */
		unsigned int ival;	/* u_int32_t */
		unsigned long long Lval;/* u_int64_t, u_int64_t */

		switch(pr->bcnt) {
		case 1:
			printf(pr->fmt, (unsigned long long) *bp);
			break;
		case 2:
			memmove(&sval, bp, sizeof(sval));
			printf(pr->fmt, (unsigned long long) sval);
			break;
		case 4:
			memmove(&ival, bp, sizeof(ival));
			printf(pr->fmt, (unsigned long long) ival);
			break;
		case 8:
			memmove(&Lval, bp, sizeof(Lval));
			printf(pr->fmt, Lval);
			break;
		}
		break;
	    }
	}
	if (color) /* did we colorize something? */
		color_disable();
}

static void bpad(struct hexdump_pr *pr)
{
	static const char *spec = " -0+#";
	char *p1, *p2;

	/*
	 * remove all conversion flags; '-' is the only one valid
	 * with %s, and it's not useful here.
	 */
	pr->flags = F_BPAD;
	pr->cchar[0] = 's';
	pr->cchar[1] = 0;

	p1 = pr->fmt;
	while (*p1 != '%')
		++p1;

	p2 = ++p1;
	while (*p1 && strchr(spec, *p1))
		++p1;

	while ((*p2++ = *p1++))
		;
}

void display(struct hexdump *hex)
{
	register struct list_head *fs;
	register struct hexdump_fs *fss;
	register struct hexdump_fu *fu;
	register struct hexdump_pr *pr;
	register int cnt;
	register unsigned char *bp;
	off_t saveaddress;
	unsigned char savech = 0, *savebp;
	struct list_head *p, *q, *r;

	while ((bp = get(hex)) != NULL) {
		fs = &hex->fshead; savebp = bp; saveaddress = address;

		list_for_each(p, fs) {
			fss = list_entry(p, struct hexdump_fs, fslist);

			list_for_each(q, &fss->fulist) {
				fu = list_entry(q, struct hexdump_fu, fulist);

				if (fu->flags&F_IGNORE)
					break;

				cnt = fu->reps;

				while (cnt) {
					list_for_each(r, &fu->prlist) {
						pr = list_entry(r, struct hexdump_pr, prlist);

						if (eaddress && address >= eaddress
						    && !(pr->flags&(F_TEXT|F_BPAD)))
							bpad(pr);

						if (cnt == 1 && pr->nospace) {
							savech = *pr->nospace;
							*pr->nospace = '\0';
							print(pr, bp);
							*pr->nospace = savech;
						} else
							print(pr, bp);

						address += pr->bcnt;
						bp += pr->bcnt;
					}
					--cnt;
				}
			}
			bp = savebp;
			address = saveaddress;
		}
	}
	if (endfu) {
		/*
		 * if eaddress not set, error or file size was multiple of
		 * blocksize, and no partial block ever found.
		 */
		if (!eaddress) {
			if (!address)
				return;
			eaddress = address;
		}
		list_for_each (p, &endfu->prlist) {
			const char *color = NULL;

			pr = list_entry(p, struct hexdump_pr, prlist);
			if (colors_wanted() && pr->colorlist
			    && (color = color_cond(pr, bp, pr->bcnt))) {
				color_enable(color);
			}

			switch(pr->flags) {
			case F_ADDRESS:
				printf(pr->fmt, eaddress);
				break;
			case F_TEXT:
				printf("%s", pr->fmt);
				break;
			}
			if (color) /* did we highlight something? */
				color_disable();
		}
	}
}

static char **_argv;

static u_char *
get(struct hexdump *hex)
{
	static int ateof = 1;
	static u_char *curp, *savp;
	ssize_t n, need, nread;
	u_char *tmpp;

	if (!curp) {
		curp = xcalloc(1, hex->blocksize);
		savp = xcalloc(1, hex->blocksize);
	} else {
		tmpp = curp;
		curp = savp;
		savp = tmpp;
		address += hex->blocksize;
	}
	need = hex->blocksize, nread = 0;
	while (TRUE) {
		/*
		 * if read the right number of bytes, or at EOF for one file,
		 * and no other files are available, zero-pad the rest of the
		 * block and set the end flag.
		 */
		if (!hex->length || (ateof && !next(NULL, hex))) {
			if (need == hex->blocksize)
				goto retnul;
			if (!need && vflag != ALL &&
			    !memcmp(curp, savp, nread)) {
				if (vflag != DUP)
					printf("*\n");
				goto retnul;
			}
			if (need > 0)
				memset((char *)curp + nread, 0, need);
			eaddress = address + nread;
			return(curp);
		}
		if (fileno(stdin) == -1) {
			warnx(_("all input file arguments failed"));
			goto retnul;
		}
		n = fread((char *)curp + nread, sizeof(unsigned char),
		    hex->length == -1 ? need : min(hex->length, need), stdin);
		if (!n) {
			if (ferror(stdin))
				warn("%s", _argv[-1]);
			ateof = 1;
			continue;
		}
		ateof = 0;
		if (hex->length != -1)
			hex->length -= n;
		if (!(need -= n)) {
			if (vflag == ALL || vflag == FIRST ||
			    memcmp(curp, savp, hex->blocksize) != 0) {
				if (vflag == DUP || vflag == FIRST)
					vflag = WAIT;
				return(curp);
			}
			if (vflag == WAIT)
				printf("*\n");
			vflag = DUP;
			address += hex->blocksize;
			need = hex->blocksize;
			nread = 0;
		}
		else
			nread += n;
	}
retnul:
	free (curp);
	free (savp);
	return NULL;
}

int next(char **argv, struct hexdump *hex)
{
	static int done;
	int statok;

	if (argv) {
		_argv = argv;
		return(1);
	}
	while (TRUE) {
		if (*_argv) {
			if (!(freopen(*_argv, "r", stdin))) {
				warn("%s", *_argv);
				hex->exitval = EXIT_FAILURE;
				++_argv;
				continue;
			}
			statok = done = 1;
		} else {
			if (done++)
				return(0);
			statok = 0;
		}
		if (hex->skip)
			doskip(statok ? *_argv : "stdin", statok, hex);
		if (*_argv)
			++_argv;
		if (!hex->skip)
			return(1);
	}
	/* NOTREACHED */
}

static void
doskip(const char *fname, int statok, struct hexdump *hex)
{
	struct stat sbuf;

	if (statok) {
		if (fstat(fileno(stdin), &sbuf))
		        err(EXIT_FAILURE, "%s", fname);
		if (S_ISREG(sbuf.st_mode) && hex->skip > sbuf.st_size) {
		  /* If size valid and skip >= size */
			hex->skip -= sbuf.st_size;
			address += sbuf.st_size;
			return;
		}
	}
	/* sbuf may be undefined here - do not test it */
	if (fseek(stdin, hex->skip, SEEK_SET))
	        err(EXIT_FAILURE, "%s", fname);
	address += hex->skip;
	hex->skip = 0;
}