aboutsummaryrefslogtreecommitdiff
path: root/scripts/dtc/util.c
blob: 9c6fb5f286ae4113990e875eaf8d9e00940a4648 (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
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
/*
 * Copyright 2011 The Chromium Authors, All Rights Reserved.
 * Copyright 2008 Jon Loeliger, Freescale Semiconductor, Inc.
 *
 * util_is_printable_string contributed by
 *	Pantelis Antoniou <pantelis.antoniou AT gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *                                                                   USA
 */

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>

#include <errno.h>
#include <fcntl.h>
#include <unistd.h>

#include "libfdt.h"
#include "util.h"
#include "version_gen.h"

char *xstrdup(const char *s)
{
	int len = strlen(s) + 1;
	char *d = xmalloc(len);

	memcpy(d, s, len);

	return d;
}

int xavsprintf_append(char **strp, const char *fmt, va_list ap)
{
	int n, size = 0;	/* start with 128 bytes */
	char *p;
	va_list ap_copy;

	p = *strp;
	if (p)
		size = strlen(p);

	va_copy(ap_copy, ap);
	n = vsnprintf(NULL, 0, fmt, ap_copy) + 1;
	va_end(ap_copy);

	p = xrealloc(p, size + n);

	n = vsnprintf(p + size, n, fmt, ap);

	*strp = p;
	return strlen(p);
}

int xasprintf_append(char **strp, const char *fmt, ...)
{
	int n;
	va_list ap;

	va_start(ap, fmt);
	n = xavsprintf_append(strp, fmt, ap);
	va_end(ap);

	return n;
}

int xasprintf(char **strp, const char *fmt, ...)
{
	int n;
	va_list ap;

	*strp = NULL;

	va_start(ap, fmt);
	n = xavsprintf_append(strp, fmt, ap);
	va_end(ap);

	return n;
}

char *join_path(const char *path, const char *name)
{
	int lenp = strlen(path);
	int lenn = strlen(name);
	int len;
	int needslash = 1;
	char *str;

	len = lenp + lenn + 2;
	if ((lenp > 0) && (path[lenp-1] == '/')) {
		needslash = 0;
		len--;
	}

	str = xmalloc(len);
	memcpy(str, path, lenp);
	if (needslash) {
		str[lenp] = '/';
		lenp++;
	}
	memcpy(str+lenp, name, lenn+1);
	return str;
}

bool util_is_printable_string(const void *data, int len)
{
	const char *s = data;
	const char *ss, *se;

	/* zero length is not */
	if (len == 0)
		return 0;

	/* must terminate with zero */
	if (s[len - 1] != '\0')
		return 0;

	se = s + len;

	while (s < se) {
		ss = s;
		while (s < se && *s && isprint((unsigned char)*s))
			s++;

		/* not zero, or not done yet */
		if (*s != '\0' || s == ss)
			return 0;

		s++;
	}

	return 1;
}

/*
 * Parse a octal encoded character starting at index i in string s.  The
 * resulting character will be returned and the index i will be updated to
 * point at the character directly after the end of the encoding, this may be
 * the '\0' terminator of the string.
 */
static char get_oct_char(const char *s, int *i)
{
	char x[4];
	char *endx;
	long val;

	x[3] = '\0';
	strncpy(x, s + *i, 3);

	val = strtol(x, &endx, 8);

	assert(endx > x);

	(*i) += endx - x;
	return val;
}

/*
 * Parse a hexadecimal encoded character starting at index i in string s.  The
 * resulting character will be returned and the index i will be updated to
 * point at the character directly after the end of the encoding, this may be
 * the '\0' terminator of the string.
 */
static char get_hex_char(const char *s, int *i)
{
	char x[3];
	char *endx;
	long val;

	x[2] = '\0';
	strncpy(x, s + *i, 2);

	val = strtol(x, &endx, 16);
	if (!(endx  > x))
		die("\\x used with no following hex digits\n");

	(*i) += endx - x;
	return val;
}

char get_escape_char(const char *s, int *i)
{
	char	c = s[*i];
	int	j = *i + 1;
	char	val;

	switch (c) {
	case 'a':
		val = '\a';
		break;
	case 'b':
		val = '\b';
		break;
	case 't':
		val = '\t';
		break;
	case 'n':
		val = '\n';
		break;
	case 'v':
		val = '\v';
		break;
	case 'f':
		val = '\f';
		break;
	case 'r':
		val = '\r';
		break;
	case '0':
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
		j--; /* need to re-read the first digit as
		      * part of the octal value */
		val = get_oct_char(s, &j);
		break;
	case 'x':
		val = get_hex_char(s, &j);
		break;
	default:
		val = c;
	}

	(*i) = j;
	return val;
}

int utilfdt_read_err(const char *filename, char **buffp, size_t *len)
{
	int fd = 0;	/* assume stdin */
	char *buf = NULL;
	size_t bufsize = 1024, offset = 0;
	int ret = 0;

	*buffp = NULL;
	if (strcmp(filename, "-") != 0) {
		fd = open(filename, O_RDONLY);
		if (fd < 0)
			return errno;
	}

	/* Loop until we have read everything */
	buf = xmalloc(bufsize);
	do {
		/* Expand the buffer to hold the next chunk */
		if (offset == bufsize) {
			bufsize *= 2;
			buf = xrealloc(buf, bufsize);
		}

		ret = read(fd, &buf[offset], bufsize - offset);
		if (ret < 0) {
			ret = errno;
			break;
		}
		offset += ret;
	} while (ret != 0);

	/* Clean up, including closing stdin; return errno on error */
	close(fd);
	if (ret)
		free(buf);
	else
		*buffp = buf;
	if (len)
		*len = bufsize;
	return ret;
}

char *utilfdt_read(const char *filename, size_t *len)
{
	char *buff;
	int ret = utilfdt_read_err(filename, &buff, len);

	if (ret) {
		fprintf(stderr, "Couldn't open blob from '%s': %s\n", filename,
			strerror(ret));
		return NULL;
	}
	/* Successful read */
	return buff;
}

int utilfdt_write_err(const char *filename, const void *blob)
{
	int fd = 1;	/* assume stdout */
	int totalsize;
	int offset;
	int ret = 0;
	const char *ptr = blob;

	if (strcmp(filename, "-") != 0) {
		fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
		if (fd < 0)
			return errno;
	}

	totalsize = fdt_totalsize(blob);
	offset = 0;

	while (offset < totalsize) {
		ret = write(fd, ptr + offset, totalsize - offset);
		if (ret < 0) {
			ret = -errno;
			break;
		}
		offset += ret;
	}
	/* Close the file/stdin; return errno on error */
	if (fd != 1)
		close(fd);
	return ret < 0 ? -ret : 0;
}


int utilfdt_write(const char *filename, const void *blob)
{
	int ret = utilfdt_write_err(filename, blob);

	if (ret) {
		fprintf(stderr, "Couldn't write blob to '%s': %s\n", filename,
			strerror(ret));
	}
	return ret ? -1 : 0;
}

int utilfdt_decode_type(const char *fmt, int *type, int *size)
{
	int qualifier = 0;

	if (!*fmt)
		return -1;

	/* get the conversion qualifier */
	*size = -1;
	if (strchr("hlLb", *fmt)) {
		qualifier = *fmt++;
		if (qualifier == *fmt) {
			switch (*fmt++) {
/* TODO:		case 'l': qualifier = 'L'; break;*/
			case 'h':
				qualifier = 'b';
				break;
			}
		}
	}

	/* we should now have a type */
	if ((*fmt == '\0') || !strchr("iuxs", *fmt))
		return -1;

	/* convert qualifier (bhL) to byte size */
	if (*fmt != 's')
		*size = qualifier == 'b' ? 1 :
				qualifier == 'h' ? 2 :
				qualifier == 'l' ? 4 : -1;
	*type = *fmt++;

	/* that should be it! */
	if (*fmt)
		return -1;
	return 0;
}

void utilfdt_print_data(const char *data, int len)
{
	int i;
	const char *s;

	/* no data, don't print */
	if (len == 0)
		return;

	if (util_is_printable_string(data, len)) {
		printf(" = ");

		s = data;
		do {
			printf("\"%s\"", s);
			s += strlen(s) + 1;
			if (s < data + len)
				printf(", ");
		} while (s < data + len);

	} else if ((len % 4) == 0) {
		const fdt32_t *cell = (const fdt32_t *)data;

		printf(" = <");
		for (i = 0, len /= 4; i < len; i++)
			printf("0x%08x%s", fdt32_to_cpu(cell[i]),
			       i < (len - 1) ? " " : "");
		printf(">");
	} else {
		const unsigned char *p = (const unsigned char *)data;
		printf(" = [");
		for (i = 0; i < len; i++)
			printf("%02x%s", *p++, i < len - 1 ? " " : "");
		printf("]");
	}
}

void NORETURN util_version(void)
{
	printf("Version: %s\n", DTC_VERSION);
	exit(0);
}

void NORETURN util_usage(const char *errmsg, const char *synopsis,
			 const char *short_opts,
			 struct option const long_opts[],
			 const char * const opts_help[])
{
	FILE *fp = errmsg ? stderr : stdout;
	const char a_arg[] = "<arg>";
	size_t a_arg_len = strlen(a_arg) + 1;
	size_t i;
	int optlen;

	fprintf(fp,
		"Usage: %s\n"
		"\n"
		"Options: -[%s]\n", synopsis, short_opts);

	/* prescan the --long opt length to auto-align */
	optlen = 0;
	for (i = 0; long_opts[i].name; ++i) {
		/* +1 is for space between --opt and help text */
		int l = strlen(long_opts[i].name) + 1;
		if (long_opts[i].has_arg == a_argument)
			l += a_arg_len;
		if (optlen < l)
			optlen = l;
	}

	for (i = 0; long_opts[i].name; ++i) {
		/* helps when adding new applets or options */
		assert(opts_help[i] != NULL);

		/* first output the short flag if it has one */
		if (long_opts[i].val > '~')
			fprintf(fp, "      ");
		else
			fprintf(fp, "  -%c, ", long_opts[i].val);

		/* then the long flag */
		if (long_opts[i].has_arg == no_argument)
			fprintf(fp, "--%-*s", optlen, long_opts[i].name);
		else
			fprintf(fp, "--%s %s%*s", long_opts[i].name, a_arg,
				(int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");

		/* finally the help text */
		fprintf(fp, "%s\n", opts_help[i]);
	}

	if (errmsg) {
		fprintf(fp, "\nError: %s\n", errmsg);
		exit(EXIT_FAILURE);
	} else
		exit(EXIT_SUCCESS);
}