summaryrefslogtreecommitdiffstats
path: root/stringbuf.c
blob: 639511ee5ecae3b553ab22ca4b9475805268103b (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
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
/* This is the byte-counted string class for rsyslog. It is a replacement
 * for classical \0 terminated string functions. We introduce it in
 * the hope it will make the program more secure, obtain some performance
 * and, most importantly, lay they foundation for syslog-protocol, which
 * requires strings to be able to handle embedded \0 characters.
 * Please see syslogd.c for license information.
 * All functions in this "class" start with rsCStr (rsyslog Counted String).
 * This code is placed under the GPL.
 * begun 2005-09-07 rgerhards
 */
#include "config.h"

#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <regex.h>
#include "rsyslog.h"
#include "stringbuf.h"
#include "srUtils.h"


/* ################################################################# *
 * private members                                                   *
 * ################################################################# */



/* ################################################################# *
 * public members                                                    *
 * ################################################################# */


rsCStrObj *rsCStrConstruct(void)
{
	rsCStrObj *pThis;

	if((pThis = (rsCStrObj*) calloc(1, sizeof(rsCStrObj))) == NULL)
		return NULL;

	rsSETOBJTYPE(pThis, OIDrsCStr);
	pThis->pBuf = NULL;
	pThis->pszBuf = NULL;
	pThis->iBufSize = 0;
	pThis->iStrLen = 0;
	pThis->iAllocIncrement = RS_STRINGBUF_ALLOC_INCREMENT;

	return pThis;
}

/* construct from sz string
 * rgerhards 2005-09-15
 */
rsRetVal rsCStrConstructFromszStr(rsCStrObj **ppThis, uchar *sz)
{
	rsCStrObj *pThis;

	assert(ppThis != NULL);

	if((pThis = rsCStrConstruct()) == NULL)
		return RS_RET_OUT_OF_MEMORY;

	pThis->iBufSize = pThis->iStrLen = strlen((char*)(char *) sz);
	if((pThis->pBuf = (uchar*) malloc(sizeof(uchar) * pThis->iStrLen)) == NULL) {
		RSFREEOBJ(pThis);
		return RS_RET_OUT_OF_MEMORY;
	}

	/* we do NOT need to copy the \0! */
	memcpy(pThis->pBuf, sz, pThis->iStrLen);

	*ppThis = pThis;
	return RS_RET_OK;
}

/* construct from CStr object. only the counted string is
 * copied, not the szString.
 * rgerhards 2005-10-18
 */
rsRetVal rsCStrConstructFromCStr(rsCStrObj **ppThis, rsCStrObj *pFrom)
{
	rsCStrObj *pThis;

	assert(ppThis != NULL);
	rsCHECKVALIDOBJECT(pFrom, OIDrsCStr);

	if((pThis = rsCStrConstruct()) == NULL)
		return RS_RET_OUT_OF_MEMORY;

	pThis->iBufSize = pThis->iStrLen = pFrom->iStrLen;
	if((pThis->pBuf = (uchar*) malloc(sizeof(uchar) * pThis->iStrLen)) == NULL) {
		RSFREEOBJ(pThis);
		return RS_RET_OUT_OF_MEMORY;
	}

	/* copy properties */
	memcpy(pThis->pBuf, pFrom->pBuf, pThis->iStrLen);

	*ppThis = pThis;
	return RS_RET_OK;
}


void rsCStrDestruct(rsCStrObj *pThis)
{
	/* rgerhards 2005-10-19: The free of pBuf was contained in conditional compilation.
	 * The code was only compiled if STRINGBUF_TRIM_ALLOCSIZE was set to 1. I honestly
	 * do not know why it was so, I think it was an artefact. Anyhow, I have changed this
	 * now. Should there any issue occur, this comment hopefully will shed some light 
	 * on what happened. I re-verified, and this function has never before been called
	 * by anyone. So changing it can have no impact for obvious reasons...
	 */
	if(pThis->pBuf != NULL) {
		free(pThis->pBuf);
	}

	if(pThis->pszBuf != NULL) {
		free(pThis->pszBuf);
	}

	RSFREEOBJ(pThis);
}


rsRetVal rsCStrAppendStrWithLen(rsCStrObj *pThis, uchar* psz, size_t iStrLen)
{
	rsRetVal iRet;
	int iOldAllocInc;

	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);
	assert(psz != NULL);
	assert(iStrLen >= 0);

	/* we first check if the to-be-added string is larger than the
	 * alloc increment. If so, we temporarily increase the alloc
	 * increment to the length of the string. This will ensure that
	 * one string copy will be needed at most. As this is a very
	 * costly operation, it outweights the cost of the strlen((char*)) and
	 * related stuff - at least I think so.
	 * rgerhards 2005-09-22
	 */
	/* We save the current alloc increment in any case, so we can just
	 * overwrite it below, this is faster than any if-construct.
	 */
	iOldAllocInc = pThis->iAllocIncrement;
	if(iStrLen > pThis->iAllocIncrement) {
		pThis->iAllocIncrement = iStrLen;
	}

	while(*psz)
		if((iRet = rsCStrAppendChar(pThis, *psz++)) != RS_RET_OK)
			return iRet;

	pThis->iAllocIncrement = iOldAllocInc; /* restore */
	return RS_RET_OK;
}


/* changed to be a wrapper to rsCStrAppendStrWithLen() so that
 * we can save some time when we have the length but do not
 * need to change existing code.
 * rgerhards, 2007-07-03
 */
rsRetVal rsCStrAppendStr(rsCStrObj *pThis, uchar* psz)
{
	return rsCStrAppendStrWithLen(pThis, psz, strlen((char*)(char*) psz));
}


rsRetVal rsCStrAppendInt(rsCStrObj *pThis, int i)
{
	rsRetVal iRet;
	uchar szBuf[32];

	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);

	if((iRet = srUtilItoA((char*) szBuf, sizeof(szBuf), i)) != RS_RET_OK)
		return iRet;

	return rsCStrAppendStr(pThis, szBuf);
}


rsRetVal rsCStrAppendChar(rsCStrObj *pThis, uchar c)
{
	uchar* pNewBuf;

	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);

	if(pThis->iStrLen >= pThis->iBufSize)
	{  /* need more memory! */
		if((pNewBuf = (uchar*) malloc((pThis->iBufSize + pThis->iAllocIncrement) * sizeof(uchar))) == NULL)
			return RS_RET_OUT_OF_MEMORY;
		memcpy(pNewBuf, pThis->pBuf, pThis->iBufSize);
		pThis->iBufSize += pThis->iAllocIncrement;
		if(pThis->pBuf != NULL) {
			free(pThis->pBuf);
		}
		pThis->pBuf = pNewBuf;
	}

	/* ok, when we reach this, we have sufficient memory */
	*(pThis->pBuf + pThis->iStrLen++) = c;

	/* check if we need to invalidate an sz representation! */
	if(pThis->pszBuf != NULL) {
		free(pThis->pszBuf);
		pThis->pszBuf = NULL;
	}

	return RS_RET_OK;
}


/* Sets the string object to the classigal sz-string provided.
 * Any previously stored vlaue is discarded. If a NULL pointer
 * the the new value (pszNew) is provided, an empty string is
 * created (this is NOT an error!). Property iAllocIncrement is
 * not modified by this function.
 * rgerhards, 2005-10-18
 */
rsRetVal rsCStrSetSzStr(rsCStrObj *pThis, uchar *pszNew)
{
	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);

	if(pThis->pBuf != NULL)
		free(pThis->pBuf);
	if(pThis->pszBuf != NULL)
		free(pThis->pszBuf);
	if(pszNew == NULL) {
		pThis->iStrLen = 0;
		pThis->iBufSize = 0;
		pThis->pBuf = NULL;
		pThis->pszBuf = NULL;
	} else {
		pThis->iStrLen = strlen((char*)pszNew);
		pThis->iBufSize = pThis->iStrLen;
		pThis->pszBuf = NULL;
		/* iAllocIncrement is NOT modified! */

		/* now save the new value */
		if((pThis->pBuf = (uchar*) malloc(sizeof(uchar) * pThis->iStrLen)) == NULL) {
			RSFREEOBJ(pThis);
			return RS_RET_OUT_OF_MEMORY;
		}

		/* we do NOT need to copy the \0! */
		memcpy(pThis->pBuf, pszNew, pThis->iStrLen);
	}

	return RS_RET_OK;
}

/* Converts the CStr object to a classical sz string and returns that.
 * Same restrictions as in rsCStrGetSzStr() applies (see there!). This
 * function here guarantees that a valid string is returned, even if
 * the CStr object currently holds a NULL pointer string buffer. If so,
 * "" is returned.
 * rgerhards 2005-10-19
 */
uchar*  rsCStrGetSzStrNoNULL(rsCStrObj *pThis)
{
	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);
	if(pThis->pBuf == NULL)
		return (uchar*) "";
	else
		return rsCStrGetSzStr(pThis);
}


/* Converts the CStr object to a classical zero-terminated C string
 * and returns that string. The caller must not free it and must not
 * destroy the CStr object as long as the ascii string is used.
 * This function may return NULL, if the string is currently NULL. This
 * is a feature, not a bug. If you need non-NULL in any case, use
 * rsCStrGetSzStrNoNULL() instead.
 * rgerhards, 2005-09-15
 */
uchar*  rsCStrGetSzStr(rsCStrObj *pThis)
{
	int i;

	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);

	if(pThis->pBuf != NULL)
		if(pThis->pszBuf == NULL) {
			/* we do not yet have a usable sz version - so create it... */
			if((pThis->pszBuf = malloc(pThis->iStrLen + 1 * sizeof(uchar))) == NULL) {
				/* TODO: think about what to do - so far, I have no bright
				 *       idea... rgerhards 2005-09-07
				 */
			}
			else { /* we can create the sz String */
				/* now copy it while doing a sanity check. The string might contain a
				 * \0 byte. There is no way how a sz string can handle this. For
				 * the time being, we simply replace it with space - something that
				 * could definitely be improved (TODO).
				 * 2005-09-15 rgerhards
				 */
				for(i = 0 ; i < pThis->iStrLen ; ++i) {
					if(pThis->pBuf[i] == '\0')
						pThis->pszBuf[i] = ' ';
					else
						pThis->pszBuf[i] = pThis->pBuf[i];
				}
				/* write terminator... */
				pThis->pszBuf[i] = '\0';
			}
		}

	return(pThis->pszBuf);
}


/* Converts the CStr object to a classical zero-terminated C string,
 * returns that string and destroys the CStr object. The returned string
 * MUST be freed by the caller. The function might return NULL if
 * no memory can be allocated.
 *
 * TODO:
 * This function should at some time become special. The base idea is to
 * add one extra byte to the end of the regular buffer, so that we can
 * convert it to an szString without the need to copy. The extra memory
 * footprint is not hefty, but the performance gain is potentially large.
 * To get it done now, I am not doing the optimiziation right now.
 *
 * rgerhards, 2005-09-07
 */
uchar*  rsCStrConvSzStrAndDestruct(rsCStrObj *pThis)
{
	uchar* pRetBuf;

	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);

	pRetBuf = rsCStrGetSzStr(pThis);

	/* We got it, now free the object ourselfs. Please note
	 * that we can NOT use the rsCStrDestruct function as it would
	 * also free the sz String buffer, which we pass on to the user.
	 */
	if(pThis->pBuf != NULL)
		free(pThis->pBuf);
	RSFREEOBJ(pThis);
	
	return(pRetBuf);
}


rsRetVal  rsCStrFinish(rsCStrObj *pThis)
{
	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);

#	if STRINGBUF_TRIM_ALLOCSIZE == 1
	/* in this mode, we need to trim the string. To do
	 * so, we must allocate a new buffer of the exact 
	 * string size, and then copy the old one over. 
	 * This new buffer is then to be returned.
	 */
	if((pRetBuf = malloc((pThis->iBufSize) * sizeof(uchar))) == NULL)
	{	/* OK, in this case we use the previous buffer. At least
		 * we have it ;)
		 */
	}
	else
	{	/* got the new buffer, so let's use it */
		uchar* pBuf;
		memcpy(pBuf, pThis->pBuf, pThis->iBufPtr + 1);
		pThis->pBuf = pBuf;
	}
#	else
	/* here, we need to do ... nothing ;)
	 */
#	endif
	return RS_RET_OK;
}

void rsCStrSetAllocIncrement(rsCStrObj *pThis, int iNewIncrement)
{
	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);
	assert(iNewIncrement > 0);

	pThis->iAllocIncrement = iNewIncrement;
}


/* return the length of the current string
 * 2005-09-09 rgerhards
 * Please note: this is only a function in a debug build.
 * For release builds, it is a macro defined in stringbuf.h.
 * This is due to performance reasons.
 */
#ifndef NDEBUG
int rsCStrLen(rsCStrObj *pThis)
{
	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);
	return(pThis->iStrLen);
}
#endif

/* Truncate characters from the end of the string.
 * rgerhards 2005-09-15
 */
rsRetVal rsCStrTruncate(rsCStrObj *pThis, int nTrunc)
{
	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);

	if(pThis->iStrLen < nTrunc)
		return RS_TRUNCAT_TOO_LARGE;
	
	pThis->iStrLen -= nTrunc;

	if(pThis->pszBuf != NULL) {
		/* in this case, we adjust the psz representation
		 * by writing a new \0 terminator - this is by far
		 * the fastest way and outweights the additional memory
		 * required. 2005-9-19 rgerhards.
		 */
		 pThis->pszBuf[pThis->iStrLen] = '\0';
	}

	return RS_RET_OK;
}

/* Trim trailing whitespace from a given string
 */
rsRetVal rsCStrTrimTrailingWhiteSpace(rsCStrObj *pThis)
{
	register int i;
	register uchar *pC;
	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);

	i = pThis->iStrLen;
	pC = pThis->pBuf + i - 1;
	while(i > 0 && isspace((int)*pC)) {
		--pC;
		--i;
	}
	/* i now is the new string length! */
	pThis->iStrLen = i;

	return RS_RET_OK;
}

/* compare two string objects - works like strcmp(), but operates
 * on CStr objects. Please note that this version here is
 * faster in the majority of cases, simply because it can
 * rely on StrLen.
 * rgerhards 2005-09-19
 * fixed bug, in which only the last byte was actually compared
 * in equal-size strings.
 * rgerhards, 2005-09-26
 */
int rsCStrCStrCmp(rsCStrObj *pCS1, rsCStrObj *pCS2)
{
	rsCHECKVALIDOBJECT(pCS1, OIDrsCStr);
	rsCHECKVALIDOBJECT(pCS2, OIDrsCStr);
	if(pCS1->iStrLen == pCS2->iStrLen)
		if(pCS1->iStrLen == 0)
			return 0; /* zero-sized string are equal ;) */
		else {  /* we now have two non-empty strings of equal
			 * length, so we need to actually check if they
			 * are equal.
			 */
			register int i;
			for(i = 0 ; i < pCS1->iStrLen ; ++i) {
				if(pCS1->pBuf[i] != pCS2->pBuf[i])
					return pCS1->pBuf[i] - pCS2->pBuf[i];
			}
			/* if we arrive here, the strings are equal */
			return 0;
		}
	else
		return pCS1->iStrLen - pCS2->iStrLen;
}


/* check if a sz-type string start with a CStr object. This function
 * is initially written to support the "startswith" property-filter
 * comparison operation. Maybe it also has other needs.
 * rgerhards 2005-10-19
 */
int rsCStrSzStrStartsWithCStr(rsCStrObj *pCS1, uchar *psz, int iLenSz)
{
	register int i;
	int iMax;

	rsCHECKVALIDOBJECT(pCS1, OIDrsCStr);
	assert(psz != NULL);
	assert(iLenSz == strlen((char*)psz)); /* just make sure during debugging! */
	if(iLenSz >= pCS1->iStrLen) {
		/* we need to checkusing pCS1->iStrLen charactes at maximum, thus
		 * we move it to iMax.
		 */
		iMax = pCS1->iStrLen;
		if(iMax == 0)
			return 0; /* yes, it starts with a zero-sized string ;) */
		else {  /* we now have something to compare, so let's do it... */
			for(i = 0 ; i < iMax ; ++i) {
				if(psz[i] != pCS1->pBuf[i])
					return psz[i] - pCS1->pBuf[i];
			}
			/* if we arrive here, the string actually starts with pCS1 */
			return 0;
		}
	}
	else
		return -1; /* pCS1 is less then psz */
}


/* check if a CStr object starts with a sz-type string.
 * rgerhards 2005-09-26
 */
int rsCStrStartsWithSzStr(rsCStrObj *pCS1, uchar *psz, int iLenSz)
{
	register int i;

	rsCHECKVALIDOBJECT(pCS1, OIDrsCStr);
	assert(psz != NULL);
	assert(iLenSz == strlen((char*)psz)); /* just make sure during debugging! */
	if(pCS1->iStrLen >= iLenSz) {
		/* we are using iLenSz below, because we need to check
		 * iLenSz characters at maximum (start with!)
		 */
		if(iLenSz == 0)
			return 0; /* yes, it starts with a zero-sized string ;) */
		else {  /* we now have something to compare, so let's do it... */
			for(i = 0 ; i < iLenSz ; ++i) {
				if(pCS1->pBuf[i] != psz[i])
					return pCS1->pBuf[i] - psz[i];
			}
			/* if we arrive here, the string actually starts with psz */
			return 0;
		}
	}
	else
		return -1; /* pCS1 is less then psz */
}

/* check if a CStr object matches a regex.
 * msamia@redhat.com 2007-07-12
 * @return returns 0 if matched
 * bug: doesn't work for CStr containing \0
 * rgerhards, 2007-07-16: bug is no real bug, because rsyslogd ensures there
 * never is a \0 *inside* a property string.
 */
int rsCStrSzStrMatchRegex(rsCStrObj *pCS1, uchar *psz, int iLenSz)
{
    regex_t preq;
    regcomp(&preq, rsCStrGetSzStr(pCS1), 0);
    int iRet = regexec(&preq, psz, 0, NULL, 0);
    regfree(&preq);
    return iRet;
}

/* compare a rsCStr object with a classical sz string.  This function
 * is almost identical to rsCStrZsStrCmp(), but it also takes an offset
 * to the CStr object from where the comparison is to start.
 * I have thought quite a while if it really makes sense to more or
 * less duplicate the code. After all, if you call it with an offset of
 * zero, the functionality is exactly the same. So it looks natural to
 * just have a single function. However, supporting the offset requires
 * some (few) additional integer operations. While they are few, they
 * happen at places in the code that is run very frequently. All in all,
 * I have opted for performance and thus duplicated the code. I hope
 * this is a good, or at least acceptable, compromise.
 * rgerhards, 2005-09-26
 * This function also has an offset-pointer which allows to
 * specify *where* the compare operation should begin in
 * the CStr. If everything is to be compared, it must be set
 * to 0. If some leading bytes are to be skipped, it must be set
 * to the first index that is to be compared. It must not be
 * set higher than the string length (this is considered a
 * program bug and will lead to unpredictable results and program aborts).
 * rgerhards 2005-09-26
 */
int rsCStrOffsetSzStrCmp(rsCStrObj *pCS1, int iOffset, uchar *psz, int iLenSz)
{
	rsCHECKVALIDOBJECT(pCS1, OIDrsCStr);
	assert(iOffset >= 0);
	assert(iOffset < pCS1->iStrLen);
	assert(psz != NULL);
	assert(iLenSz == strlen((char*)psz)); /* just make sure during debugging! */
	if((pCS1->iStrLen - iOffset) == iLenSz) {
		/* we are using iLenSz below, because the lengths
		 * are equal and iLenSz is faster to access
		 */
		if(iLenSz == 0)
			return 0; /* zero-sized strings are equal ;) */
		else {  /* we now have two non-empty strings of equal
			 * length, so we need to actually check if they
			 * are equal.
			 */
			register int i;
			for(i = 0 ; i < iLenSz ; ++i) {
				if(pCS1->pBuf[i+iOffset] != psz[i])
					return pCS1->pBuf[i+iOffset] - psz[i];
			}
			/* if we arrive here, the strings are equal */
			return 0;
		}
	}
	else
		return pCS1->iStrLen - iOffset - iLenSz;
}


/* compare a rsCStr object with a classical sz string.
 * Just like rsCStrCStrCmp, just for a different data type.
 * There must not only the sz string but also its length be
 * provided. If the caller does not know the length he can
 * call with
 * rsCstrSzStrCmp(pCS, psz, strlen((char*)psz));
 * we are not doing the strlen((char*)) ourselfs as the caller might
 * already know the length and in such cases we can save the
 * overhead of doing it one more time (strelen() is costly!).
 * The bottom line is that the provided length MUST be correct!
 * The to sz string pointer must not be NULL!
 * rgerhards 2005-09-26
 */
int rsCStrSzStrCmp(rsCStrObj *pCS1, uchar *psz, int iLenSz)
{
	rsCHECKVALIDOBJECT(pCS1, OIDrsCStr);
	assert(psz != NULL);
	assert(iLenSz == strlen((char*)psz)); /* just make sure during debugging! */
	if(pCS1->iStrLen == iLenSz)
		/* we are using iLenSz below, because the lengths
		 * are equal and iLenSz is faster to access
		 */
		if(iLenSz == 0)
			return 0; /* zero-sized strings are equal ;) */
		else {  /* we now have two non-empty strings of equal
			 * length, so we need to actually check if they
			 * are equal.
			 */
			register int i;
			for(i = 0 ; i < iLenSz ; ++i) {
				if(pCS1->pBuf[i] != psz[i])
					return pCS1->pBuf[i] - psz[i];
			}
			/* if we arrive here, the strings are equal */
			return 0;
		}
	else
		return pCS1->iStrLen - iLenSz;
}


/* Locate the first occurence of this rsCStr object inside a standard sz string.
 * Returns the offset (0-bound) of this first occurrence. If not found, -1 is
 * returned. Both parameters MUST be given (NULL is not allowed).
 * rgerhards 2005-09-19
 */
int rsCStrLocateInSzStr(rsCStrObj *pThis, uchar *sz)
{
	int i;
	int iMax;
	int bFound;
	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);
	assert(sz != NULL);
	
	if(pThis->iStrLen == 0)
		return 0;
	
	/* compute the largest index where a match could occur - after all,
	 * the to-be-located string must be able to be present in the 
	 * searched string (it needs its size ;)).
	 */
	iMax = strlen((char*)sz) - pThis->iStrLen;

	bFound = 0;
	i = 0;
	while(i  <= iMax && !bFound) {
		int iCheck;
		uchar *pComp = sz + i;
		for(iCheck = 0 ; iCheck < pThis->iStrLen ; ++iCheck)
			if(*(pComp + iCheck) != *(pThis->pBuf + iCheck))
				break;
		if(iCheck == pThis->iStrLen)
			bFound = 1; /* found! - else it wouldn't be equal */
		else
			++i; /* on to the next try */
	}

	return(bFound ? i : -1);
}


/* locate the first occurence of a standard sz string inside a rsCStr object.
 * Returns the offset (0-bound) of this first occurrence. If not found, -1 is
 * returned.
 * rgerhards 2005-09-19
 * WARNING: i accidently created this function (I later noticed I didn't relly
 *          need it... I will not remove the function, as it probably is useful
 *          some time later. However, it is not fully tested, so start with testing
 *          it before you put it to first use).
 */
int rsCStrLocateSzStr(rsCStrObj *pThis, uchar *sz)
{
	int iLenSz;
	int i;
	int iMax;
	int bFound;
	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);
	
	if(sz == NULL)
		return 0;

	iLenSz = strlen((char*)sz);
	if(iLenSz == 0)
		return 0;
	
	/* compute the largest index where a match could occur - after all,
	 * the to-be-located string must be able to be present in the 
	 * searched string (it needs its size ;)).
	 */
	iMax = pThis->iStrLen - iLenSz;

	bFound = 0;
	i = 0;
	while(i  < iMax && !bFound) {
		int iCheck;
		uchar *pComp = pThis->pBuf + i;
		for(iCheck = 0 ; iCheck < iLenSz ; ++iCheck)
			if(*(pComp + iCheck) != *(sz + iCheck))
				break;
		if(iCheck == iLenSz)
			bFound = 1; /* found! - else it wouldn't be equal */
		else
			++i; /* on to the next try */
	}

	return(bFound ? i : -1);
}


/*
 * Local variables:
 *  c-indent-level: 8
 *  c-basic-offset: 8
 *  tab-width: 8
 * End:
 * vi:set ai:
 */