summaryrefslogtreecommitdiff
path: root/source4/lib/charset/util_unistr.c
blob: 1eb198d6f9cffe02f651bb287d41a95f0aa1c08c (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
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
/* 
   Unix SMB/CIFS implementation.
   Samba utility functions
   Copyright (C) Andrew Tridgell 1992-2001
   Copyright (C) Simo Sorce 2001
   
   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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "system/iconv.h"

/**
 * @file
 * @brief Unicode string manipulation
 */

/* these 2 tables define the unicode case handling.  They are loaded
   at startup either via mmap() or read() from the lib directory */
static void *upcase_table;
static void *lowcase_table;


/*******************************************************************
load the case handling tables
********************************************************************/
static void load_case_tables(void)
{
	TALLOC_CTX *mem_ctx;

	mem_ctx = talloc_init("load_case_tables");
	if (!mem_ctx) {
		smb_panic("No memory for case_tables");
	}
	upcase_table = map_file(data_path(mem_ctx, "upcase.dat"), 0x20000);
	lowcase_table = map_file(data_path(mem_ctx, "lowcase.dat"), 0x20000);
	talloc_free(mem_ctx);
	if (upcase_table == NULL) {
		/* try also under codepages for testing purposes */
		upcase_table = map_file("codepages/upcase.dat", 0x20000);
		if (upcase_table == NULL) {
			upcase_table = (void *)-1;
		}
	}
	if (lowcase_table == NULL) {
		/* try also under codepages for testing purposes */
		lowcase_table = map_file("codepages/lowcase.dat", 0x20000);
		if (lowcase_table == NULL) {
			lowcase_table = (void *)-1;
		}
	}
}

/**
 Convert a codepoint_t to upper case.
**/
codepoint_t toupper_w(codepoint_t val)
{
	if (val < 128) {
		return toupper(val);
	}
	if (upcase_table == NULL) {
		load_case_tables();
	}
	if (upcase_table == (void *)-1) {
		return val;
	}
	if (val & 0xFFFF0000) {
		return val;
	}
	return SVAL(upcase_table, val*2);
}

/**
 Convert a codepoint_t to lower case.
**/
codepoint_t tolower_w(codepoint_t val)
{
	if (val < 128) {
		return tolower(val);
	}
	if (lowcase_table == NULL) {
		load_case_tables();
	}
	if (lowcase_table == (void *)-1) {
		return val;
	}
	if (val & 0xFFFF0000) {
		return val;
	}
	return SVAL(lowcase_table, val*2);
}

/**
  compare two codepoints case insensitively
*/
int codepoint_cmpi(codepoint_t c1, codepoint_t c2)
{
	if (c1 == c2 ||
	    toupper_w(c1) == toupper_w(c2)) {
		return 0;
	}
	return c1 - c2;
}

/**
 Case insensitive string compararison
**/
_PUBLIC_ int strcasecmp_m(const char *s1, const char *s2)
{
	codepoint_t c1=0, c2=0;
	size_t size1, size2;

	while (*s1 && *s2) {
		c1 = next_codepoint(s1, &size1);
		c2 = next_codepoint(s2, &size2);

		s1 += size1;
		s2 += size2;

		if (c1 == c2) {
			continue;
		}

		if (c1 == INVALID_CODEPOINT ||
		    c2 == INVALID_CODEPOINT) {
			/* what else can we do?? */
			return strcasecmp(s1, s2);
		}

		if (toupper_w(c1) != toupper_w(c2)) {
			return c1 - c2;
		}
	}

	return *s1 - *s2;
}

/**
 * Get the next token from a string, return False if none found.
 * Handles double-quotes.
 * 
 * Based on a routine by GJC@VILLAGE.COM. 
 * Extensively modified by Andrew.Tridgell@anu.edu.au
 **/
_PUBLIC_ BOOL next_token(const char **ptr,char *buff, const char *sep, size_t bufsize)
{
	const char *s;
	BOOL quoted;
	size_t len=1;

	if (!ptr)
		return(False);

	s = *ptr;

	/* default to simple separators */
	if (!sep)
		sep = " \t\n\r";

	/* find the first non sep char */
	while (*s && strchr_m(sep,*s))
		s++;
	
	/* nothing left? */
	if (! *s)
		return(False);
	
	/* copy over the token */
	for (quoted = False; len < bufsize && *s && (quoted || !strchr_m(sep,*s)); s++) {
		if (*s == '\"') {
			quoted = !quoted;
		} else {
			len++;
			*buff++ = *s;
		}
	}
	
	*ptr = (*s) ? s+1 : s;  
	*buff = 0;
	
	return(True);
}

/**
 Case insensitive string compararison, length limited
**/
_PUBLIC_ int strncasecmp_m(const char *s1, const char *s2, size_t n)
{
	codepoint_t c1=0, c2=0;
	size_t size1, size2;

	while (*s1 && *s2 && n) {
		n--;

		c1 = next_codepoint(s1, &size1);
		c2 = next_codepoint(s2, &size2);

		s1 += size1;
		s2 += size2;

		if (c1 == c2) {
			continue;
		}

		if (c1 == INVALID_CODEPOINT ||
		    c2 == INVALID_CODEPOINT) {
			/* what else can we do?? */
			return strcasecmp(s1, s2);
		}

		if (toupper_w(c1) != toupper_w(c2)) {
			return c1 - c2;
		}
	}

	if (n == 0) {
		return 0;
	}

	return *s1 - *s2;
}

/**
 * Compare 2 strings.
 *
 * @note The comparison is case-insensitive.
 **/
_PUBLIC_ BOOL strequal_w(const char *s1, const char *s2)
{
	if (s1 == s2)
		return(True);
	if (!s1 || !s2)
		return(False);
  
	return strcasecmp_m(s1,s2) == 0;
}

/**
 Compare 2 strings (case sensitive).
**/
_PUBLIC_ BOOL strcsequal_w(const char *s1,const char *s2)
{
	if (s1 == s2)
		return(True);
	if (!s1 || !s2)
		return(False);
	
	return strcmp(s1,s2) == 0;
}


/**
 String replace.
 NOTE: oldc and newc must be 7 bit characters
**/
_PUBLIC_ void string_replace_w(char *s, char oldc, char newc)
{
	for (; s && *s; s++) {
		size_t size;
		codepoint_t c = next_codepoint(s, &size);
		if (c == oldc) {
			*s = newc;
		}
		s += size;
	}
}

/**
 Paranoid strcpy into a buffer of given length (includes terminating
 zero. Strips out all but 'a-Z0-9' and the character in other_safe_chars
 and replaces with '_'. Deliberately does *NOT* check for multibyte
 characters. Don't change it !
**/

_PUBLIC_ char *alpha_strcpy(char *dest, const char *src, const char *other_safe_chars, size_t maxlength)
{
	size_t len, i;

	if (maxlength == 0) {
		/* can't fit any bytes at all! */
		return NULL;
	}

	if (!dest) {
		DEBUG(0,("ERROR: NULL dest in alpha_strcpy\n"));
		return NULL;
	}

	if (!src) {
		*dest = 0;
		return dest;
	}  

	len = strlen(src);
	if (len >= maxlength)
		len = maxlength - 1;

	if (!other_safe_chars)
		other_safe_chars = "";

	for(i = 0; i < len; i++) {
		int val = (src[i] & 0xff);
		if (isupper(val) || islower(val) || isdigit(val) || strchr_m(other_safe_chars, val))
			dest[i] = src[i];
		else
			dest[i] = '_';
	}

	dest[i] = '\0';

	return dest;
}

/**
 Count the number of UCS2 characters in a string. Normally this will
 be the same as the number of bytes in a string for single byte strings,
 but will be different for multibyte.
**/
_PUBLIC_ size_t strlen_m(const char *s)
{
	size_t count = 0;

	if (!s) {
		return 0;
	}

	while (*s && !(((uint8_t)*s) & 0x80)) {
		s++;
		count++;
	}

	if (!*s) {
		return count;
	}

	while (*s) {
		size_t c_size;
		codepoint_t c = next_codepoint(s, &c_size);
		if (c < 0x10000) {
			count += 1;
		} else {
			count += 2;
		}
		s += c_size;
	}

	return count;
}

/**
   Work out the number of multibyte chars in a string, including the NULL
   terminator.
**/
_PUBLIC_ size_t strlen_m_term(const char *s)
{
	if (!s) {
		return 0;
	}

	return strlen_m(s) + 1;
}

/**
 Strchr and strrchr_m are a bit complex on general multi-byte strings. 
**/
_PUBLIC_ char *strchr_m(const char *s, char c)
{
	/* characters below 0x3F are guaranteed to not appear in
	   non-initial position in multi-byte charsets */
	if ((c & 0xC0) == 0) {
		return strchr(s, c);
	}

	while (*s) {
		size_t size;
		codepoint_t c2 = next_codepoint(s, &size);
		if (c2 == c) {
			return discard_const(s);
		}
		s += size;
	}

	return NULL;
}

/**
 * Multibyte-character version of strrchr
 */
_PUBLIC_ char *strrchr_m(const char *s, char c)
{
	char *ret = NULL;

	/* characters below 0x3F are guaranteed to not appear in
	   non-initial position in multi-byte charsets */
	if ((c & 0xC0) == 0) {
		return strrchr(s, c);
	}

	while (*s) {
		size_t size;
		codepoint_t c2 = next_codepoint(s, &size);
		if (c2 == c) {
			ret = discard_const(s);
		}
		s += size;
	}

	return ret;
}

/**
  return True if any (multi-byte) character is lower case
*/
_PUBLIC_ BOOL strhaslower(const char *string)
{
	while (*string) {
		size_t c_size;
		codepoint_t s;
		codepoint_t t;

		s = next_codepoint(string, &c_size);
		string += c_size;

		t = toupper_w(s);

		if (s != t) {
			return True; /* that means it has lower case chars */
		}
	}

	return False;
} 

/**
  return True if any (multi-byte) character is upper case
*/
_PUBLIC_ BOOL strhasupper(const char *string)
{
	while (*string) {
		size_t c_size;
		codepoint_t s;
		codepoint_t t;

		s = next_codepoint(string, &c_size);
		string += c_size;

		t = tolower_w(s);

		if (s != t) {
			return True; /* that means it has upper case chars */
		}
	}

	return False;
} 

/**
 Convert a string to lower case, allocated with talloc
**/
_PUBLIC_ char *strlower_talloc(TALLOC_CTX *ctx, const char *src)
{
	size_t size=0;
	char *dest;

	/* this takes advantage of the fact that upper/lower can't
	   change the length of a character by more than 1 byte */
	dest = talloc_size(ctx, 2*(strlen(src))+1);
	if (dest == NULL) {
		return NULL;
	}

	while (*src) {
		size_t c_size;
		codepoint_t c = next_codepoint(src, &c_size);
		src += c_size;

		c = tolower_w(c);

		c_size = push_codepoint(dest+size, c);
		if (c_size == -1) {
			talloc_free(dest);
			return NULL;
		}
		size += c_size;
	}

	dest[size] = 0;

	return dest;
}

/**
 Convert a string to UPPER case, allocated with talloc
**/
_PUBLIC_ char *strupper_talloc(TALLOC_CTX *ctx, const char *src)
{
	size_t size=0;
	char *dest;
	
	if (!src) {
		return NULL;
	}

	/* this takes advantage of the fact that upper/lower can't
	   change the length of a character by more than 1 byte */
	dest = talloc_size(ctx, 2*(strlen(src))+1);
	if (dest == NULL) {
		return NULL;
	}

	while (*src) {
		size_t c_size;
		codepoint_t c = next_codepoint(src, &c_size);
		src += c_size;

		c = toupper_w(c);

		c_size = push_codepoint(dest+size, c);
		if (c_size == -1) {
			talloc_free(dest);
			return NULL;
		}
		size += c_size;
	}

	dest[size] = 0;

	return dest;
}

/**
 Convert a string to lower case.
**/
_PUBLIC_ void strlower_m(char *s)
{
	char *d;

	/* this is quite a common operation, so we want it to be
	   fast. We optimise for the ascii case, knowing that all our
	   supported multi-byte character sets are ascii-compatible
	   (ie. they match for the first 128 chars) */
	while (*s && !(((uint8_t)*s) & 0x80)) {
		*s = tolower((uint8_t)*s);
		s++;
	}

	if (!*s)
		return;

	d = s;

	while (*s) {
		size_t c_size, c_size2;
		codepoint_t c = next_codepoint(s, &c_size);
		c_size2 = push_codepoint(d, tolower_w(c));
		if (c_size2 > c_size) {
			DEBUG(0,("FATAL: codepoint 0x%x (0x%x) expanded from %d to %d bytes in strlower_m\n",
				 c, tolower_w(c), (int)c_size, (int)c_size2));
			smb_panic("codepoint expansion in strlower_m\n");
		}
		s += c_size;
		d += c_size2;
	}
	*d = 0;
}

/**
 Convert a string to UPPER case.
**/
_PUBLIC_ void strupper_m(char *s)
{
	char *d;

	/* this is quite a common operation, so we want it to be
	   fast. We optimise for the ascii case, knowing that all our
	   supported multi-byte character sets are ascii-compatible
	   (ie. they match for the first 128 chars) */
	while (*s && !(((uint8_t)*s) & 0x80)) {
		*s = toupper((uint8_t)*s);
		s++;
	}

	if (!*s)
		return;

	d = s;

	while (*s) {
		size_t c_size, c_size2;
		codepoint_t c = next_codepoint(s, &c_size);
		c_size2 = push_codepoint(d, toupper_w(c));
		if (c_size2 > c_size) {
			DEBUG(0,("FATAL: codepoint 0x%x (0x%x) expanded from %d to %d bytes in strupper_m\n",
				 c, toupper_w(c), (int)c_size, (int)c_size2));
			smb_panic("codepoint expansion in strupper_m\n");
		}
		s += c_size;
		d += c_size2;
	}
	*d = 0;
}


/**
 Find the number of 'c' chars in a string
**/
_PUBLIC_ size_t count_chars_w(const char *s, char c)
{
	size_t count = 0;

	while (*s) {
		size_t size;
		codepoint_t c2 = next_codepoint(s, &size);
		if (c2 == c) count++;
		s += size;
	}

	return count;
}