xref: /openbmc/linux/scripts/dtc/util.c (revision 5d0e4d78) 
1 /*
2  * Copyright 2011 The Chromium Authors, All Rights Reserved.
3  * Copyright 2008 Jon Loeliger, Freescale Semiconductor, Inc.
4  *
5  * util_is_printable_string contributed by
6  *	Pantelis Antoniou <pantelis.antoniou AT gmail.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of the
11  * License, or (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  *  General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
21  *                                                                   USA
22  */
23 
24 #include <ctype.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <stdarg.h>
28 #include <string.h>
29 #include <assert.h>
30 
31 #include <errno.h>
32 #include <fcntl.h>
33 #include <unistd.h>
34 
35 #include "libfdt.h"
36 #include "util.h"
37 #include "version_gen.h"
38 
39 char *xstrdup(const char *s)
40 {
41 	int len = strlen(s) + 1;
42 	char *d = xmalloc(len);
43 
44 	memcpy(d, s, len);
45 
46 	return d;
47 }
48 
49 /* based in part from (3) vsnprintf */
50 int xasprintf(char **strp, const char *fmt, ...)
51 {
52 	int n, size = 128;	/* start with 128 bytes */
53 	char *p;
54 	va_list ap;
55 
56 	/* initial pointer is NULL making the fist realloc to be malloc */
57 	p = NULL;
58 	while (1) {
59 		p = xrealloc(p, size);
60 
61 		/* Try to print in the allocated space. */
62 		va_start(ap, fmt);
63 		n = vsnprintf(p, size, fmt, ap);
64 		va_end(ap);
65 
66 		/* If that worked, return the string. */
67 		if (n > -1 && n < size)
68 			break;
69 		/* Else try again with more space. */
70 		if (n > -1)	/* glibc 2.1 */
71 			size = n + 1; /* precisely what is needed */
72 		else		/* glibc 2.0 */
73 			size *= 2; /* twice the old size */
74 	}
75 	*strp = p;
76 	return strlen(p);
77 }
78 
79 char *join_path(const char *path, const char *name)
80 {
81 	int lenp = strlen(path);
82 	int lenn = strlen(name);
83 	int len;
84 	int needslash = 1;
85 	char *str;
86 
87 	len = lenp + lenn + 2;
88 	if ((lenp > 0) && (path[lenp-1] == '/')) {
89 		needslash = 0;
90 		len--;
91 	}
92 
93 	str = xmalloc(len);
94 	memcpy(str, path, lenp);
95 	if (needslash) {
96 		str[lenp] = '/';
97 		lenp++;
98 	}
99 	memcpy(str+lenp, name, lenn+1);
100 	return str;
101 }
102 
103 bool util_is_printable_string(const void *data, int len)
104 {
105 	const char *s = data;
106 	const char *ss, *se;
107 
108 	/* zero length is not */
109 	if (len == 0)
110 		return 0;
111 
112 	/* must terminate with zero */
113 	if (s[len - 1] != '\0')
114 		return 0;
115 
116 	se = s + len;
117 
118 	while (s < se) {
119 		ss = s;
120 		while (s < se && *s && isprint((unsigned char)*s))
121 			s++;
122 
123 		/* not zero, or not done yet */
124 		if (*s != '\0' || s == ss)
125 			return 0;
126 
127 		s++;
128 	}
129 
130 	return 1;
131 }
132 
133 /*
134  * Parse a octal encoded character starting at index i in string s.  The
135  * resulting character will be returned and the index i will be updated to
136  * point at the character directly after the end of the encoding, this may be
137  * the '\0' terminator of the string.
138  */
139 static char get_oct_char(const char *s, int *i)
140 {
141 	char x[4];
142 	char *endx;
143 	long val;
144 
145 	x[3] = '\0';
146 	strncpy(x, s + *i, 3);
147 
148 	val = strtol(x, &endx, 8);
149 
150 	assert(endx > x);
151 
152 	(*i) += endx - x;
153 	return val;
154 }
155 
156 /*
157  * Parse a hexadecimal encoded character starting at index i in string s.  The
158  * resulting character will be returned and the index i will be updated to
159  * point at the character directly after the end of the encoding, this may be
160  * the '\0' terminator of the string.
161  */
162 static char get_hex_char(const char *s, int *i)
163 {
164 	char x[3];
165 	char *endx;
166 	long val;
167 
168 	x[2] = '\0';
169 	strncpy(x, s + *i, 2);
170 
171 	val = strtol(x, &endx, 16);
172 	if (!(endx  > x))
173 		die("\\x used with no following hex digits\n");
174 
175 	(*i) += endx - x;
176 	return val;
177 }
178 
179 char get_escape_char(const char *s, int *i)
180 {
181 	char	c = s[*i];
182 	int	j = *i + 1;
183 	char	val;
184 
185 	switch (c) {
186 	case 'a':
187 		val = '\a';
188 		break;
189 	case 'b':
190 		val = '\b';
191 		break;
192 	case 't':
193 		val = '\t';
194 		break;
195 	case 'n':
196 		val = '\n';
197 		break;
198 	case 'v':
199 		val = '\v';
200 		break;
201 	case 'f':
202 		val = '\f';
203 		break;
204 	case 'r':
205 		val = '\r';
206 		break;
207 	case '0':
208 	case '1':
209 	case '2':
210 	case '3':
211 	case '4':
212 	case '5':
213 	case '6':
214 	case '7':
215 		j--; /* need to re-read the first digit as
216 		      * part of the octal value */
217 		val = get_oct_char(s, &j);
218 		break;
219 	case 'x':
220 		val = get_hex_char(s, &j);
221 		break;
222 	default:
223 		val = c;
224 	}
225 
226 	(*i) = j;
227 	return val;
228 }
229 
230 int utilfdt_read_err_len(const char *filename, char **buffp, off_t *len)
231 {
232 	int fd = 0;	/* assume stdin */
233 	char *buf = NULL;
234 	off_t bufsize = 1024, offset = 0;
235 	int ret = 0;
236 
237 	*buffp = NULL;
238 	if (strcmp(filename, "-") != 0) {
239 		fd = open(filename, O_RDONLY);
240 		if (fd < 0)
241 			return errno;
242 	}
243 
244 	/* Loop until we have read everything */
245 	buf = xmalloc(bufsize);
246 	do {
247 		/* Expand the buffer to hold the next chunk */
248 		if (offset == bufsize) {
249 			bufsize *= 2;
250 			buf = xrealloc(buf, bufsize);
251 		}
252 
253 		ret = read(fd, &buf[offset], bufsize - offset);
254 		if (ret < 0) {
255 			ret = errno;
256 			break;
257 		}
258 		offset += ret;
259 	} while (ret != 0);
260 
261 	/* Clean up, including closing stdin; return errno on error */
262 	close(fd);
263 	if (ret)
264 		free(buf);
265 	else
266 		*buffp = buf;
267 	*len = bufsize;
268 	return ret;
269 }
270 
271 int utilfdt_read_err(const char *filename, char **buffp)
272 {
273 	off_t len;
274 	return utilfdt_read_err_len(filename, buffp, &len);
275 }
276 
277 char *utilfdt_read_len(const char *filename, off_t *len)
278 {
279 	char *buff;
280 	int ret = utilfdt_read_err_len(filename, &buff, len);
281 
282 	if (ret) {
283 		fprintf(stderr, "Couldn't open blob from '%s': %s\n", filename,
284 			strerror(ret));
285 		return NULL;
286 	}
287 	/* Successful read */
288 	return buff;
289 }
290 
291 char *utilfdt_read(const char *filename)
292 {
293 	off_t len;
294 	return utilfdt_read_len(filename, &len);
295 }
296 
297 int utilfdt_write_err(const char *filename, const void *blob)
298 {
299 	int fd = 1;	/* assume stdout */
300 	int totalsize;
301 	int offset;
302 	int ret = 0;
303 	const char *ptr = blob;
304 
305 	if (strcmp(filename, "-") != 0) {
306 		fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
307 		if (fd < 0)
308 			return errno;
309 	}
310 
311 	totalsize = fdt_totalsize(blob);
312 	offset = 0;
313 
314 	while (offset < totalsize) {
315 		ret = write(fd, ptr + offset, totalsize - offset);
316 		if (ret < 0) {
317 			ret = -errno;
318 			break;
319 		}
320 		offset += ret;
321 	}
322 	/* Close the file/stdin; return errno on error */
323 	if (fd != 1)
324 		close(fd);
325 	return ret < 0 ? -ret : 0;
326 }
327 
328 
329 int utilfdt_write(const char *filename, const void *blob)
330 {
331 	int ret = utilfdt_write_err(filename, blob);
332 
333 	if (ret) {
334 		fprintf(stderr, "Couldn't write blob to '%s': %s\n", filename,
335 			strerror(ret));
336 	}
337 	return ret ? -1 : 0;
338 }
339 
340 int utilfdt_decode_type(const char *fmt, int *type, int *size)
341 {
342 	int qualifier = 0;
343 
344 	if (!*fmt)
345 		return -1;
346 
347 	/* get the conversion qualifier */
348 	*size = -1;
349 	if (strchr("hlLb", *fmt)) {
350 		qualifier = *fmt++;
351 		if (qualifier == *fmt) {
352 			switch (*fmt++) {
353 /* TODO:		case 'l': qualifier = 'L'; break;*/
354 			case 'h':
355 				qualifier = 'b';
356 				break;
357 			}
358 		}
359 	}
360 
361 	/* we should now have a type */
362 	if ((*fmt == '\0') || !strchr("iuxs", *fmt))
363 		return -1;
364 
365 	/* convert qualifier (bhL) to byte size */
366 	if (*fmt != 's')
367 		*size = qualifier == 'b' ? 1 :
368 				qualifier == 'h' ? 2 :
369 				qualifier == 'l' ? 4 : -1;
370 	*type = *fmt++;
371 
372 	/* that should be it! */
373 	if (*fmt)
374 		return -1;
375 	return 0;
376 }
377 
378 void utilfdt_print_data(const char *data, int len)
379 {
380 	int i;
381 	const char *s;
382 
383 	/* no data, don't print */
384 	if (len == 0)
385 		return;
386 
387 	if (util_is_printable_string(data, len)) {
388 		printf(" = ");
389 
390 		s = data;
391 		do {
392 			printf("\"%s\"", s);
393 			s += strlen(s) + 1;
394 			if (s < data + len)
395 				printf(", ");
396 		} while (s < data + len);
397 
398 	} else if ((len % 4) == 0) {
399 		const fdt32_t *cell = (const fdt32_t *)data;
400 
401 		printf(" = <");
402 		for (i = 0, len /= 4; i < len; i++)
403 			printf("0x%08x%s", fdt32_to_cpu(cell[i]),
404 			       i < (len - 1) ? " " : "");
405 		printf(">");
406 	} else {
407 		const unsigned char *p = (const unsigned char *)data;
408 		printf(" = [");
409 		for (i = 0; i < len; i++)
410 			printf("%02x%s", *p++, i < len - 1 ? " " : "");
411 		printf("]");
412 	}
413 }
414 
415 void NORETURN util_version(void)
416 {
417 	printf("Version: %s\n", DTC_VERSION);
418 	exit(0);
419 }
420 
421 void NORETURN util_usage(const char *errmsg, const char *synopsis,
422 			 const char *short_opts,
423 			 struct option const long_opts[],
424 			 const char * const opts_help[])
425 {
426 	FILE *fp = errmsg ? stderr : stdout;
427 	const char a_arg[] = "<arg>";
428 	size_t a_arg_len = strlen(a_arg) + 1;
429 	size_t i;
430 	int optlen;
431 
432 	fprintf(fp,
433 		"Usage: %s\n"
434 		"\n"
435 		"Options: -[%s]\n", synopsis, short_opts);
436 
437 	/* prescan the --long opt length to auto-align */
438 	optlen = 0;
439 	for (i = 0; long_opts[i].name; ++i) {
440 		/* +1 is for space between --opt and help text */
441 		int l = strlen(long_opts[i].name) + 1;
442 		if (long_opts[i].has_arg == a_argument)
443 			l += a_arg_len;
444 		if (optlen < l)
445 			optlen = l;
446 	}
447 
448 	for (i = 0; long_opts[i].name; ++i) {
449 		/* helps when adding new applets or options */
450 		assert(opts_help[i] != NULL);
451 
452 		/* first output the short flag if it has one */
453 		if (long_opts[i].val > '~')
454 			fprintf(fp, "      ");
455 		else
456 			fprintf(fp, "  -%c, ", long_opts[i].val);
457 
458 		/* then the long flag */
459 		if (long_opts[i].has_arg == no_argument)
460 			fprintf(fp, "--%-*s", optlen, long_opts[i].name);
461 		else
462 			fprintf(fp, "--%s %s%*s", long_opts[i].name, a_arg,
463 				(int)(optlen - strlen(long_opts[i].name) - a_arg_len), "");
464 
465 		/* finally the help text */
466 		fprintf(fp, "%s\n", opts_help[i]);
467 	}
468 
469 	if (errmsg) {
470 		fprintf(fp, "\nError: %s\n", errmsg);
471 		exit(EXIT_FAILURE);
472 	} else
473 		exit(EXIT_SUCCESS);
474 }
475