math.c@ 7296

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Added libxslt-1.1.22 sources.
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1	#define IN_LIBEXSLT
2	#include "libexslt/libexslt.h"
3
4	#if defined(WIN32) && !defined (__CYGWIN__) && (!__MINGW32__)
5	#include <win32config.h>
6	#else
7	#include "config.h"
8	#endif
9
10	#include <libxml/tree.h>
11	#include <libxml/xpath.h>
12	#include <libxml/xpathInternals.h>
13
14	#include <libxslt/xsltconfig.h>
15	#include <libxslt/xsltutils.h>
16	#include <libxslt/xsltInternals.h>
17	#include <libxslt/extensions.h>
18
19	#ifdef HAVE_MATH_H
20	#include <math.h>
21	#endif
22
23	#ifdef HAVE_STDLIB_H
24	#include <stdlib.h>
25	#endif
26
27	#include "exslt.h"
28
29	/**
30	* exsltMathMin:
31	* @ns: a node-set
32	*
33	* Implements the EXSLT - Math min() function:
34	* number math:min (node-set)
35	*
36	* Returns the minimum value of the nodes passed as the argument, or
37	* xmlXPathNAN if @ns is NULL or empty or if one of the nodes
38	* turns into NaN.
39	*/
40	static double
41	exsltMathMin (xmlNodeSetPtr ns) {
42	double ret, cur;
43	int i;
44
45	if ((ns == NULL) \|\| (ns->nodeNr == 0))
46	return(xmlXPathNAN);
47	ret = xmlXPathCastNodeToNumber(ns->nodeTab[0]);
48	if (xmlXPathIsNaN(ret))
49	return(xmlXPathNAN);
50	for (i = 1; i < ns->nodeNr; i++) {
51	cur = xmlXPathCastNodeToNumber(ns->nodeTab[i]);
52	if (xmlXPathIsNaN(cur))
53	return(xmlXPathNAN);
54	if (cur < ret)
55	ret = cur;
56	}
57	return(ret);
58	}
59
60	/**
61	* exsltMathMinFunction:
62	* @ctxt: an XPath parser context
63	* @nargs: the number of arguments
64	*
65	* Wraps #exsltMathMin for use by the XPath processor.
66	*/
67	static void
68	exsltMathMinFunction (xmlXPathParserContextPtr ctxt, int nargs) {
69	xmlNodeSetPtr ns;
70	double ret;
71	void *user = NULL;
72
73	if (nargs != 1) {
74	xsltGenericError(xsltGenericErrorContext,
75	"math:min: invalid number of arguments\n");
76	ctxt->error = XPATH_INVALID_ARITY;
77	return;
78	}
79	/* We need to delay the freeing of value->user */
80	if ((ctxt->value != NULL) && (ctxt->value->boolval != 0)) {
81	user = ctxt->value->user;
82	ctxt->value->boolval = 0;
83	ctxt->value->user = NULL;
84	}
85	ns = xmlXPathPopNodeSet(ctxt);
86	if (xmlXPathCheckError(ctxt))
87	return;
88
89	ret = exsltMathMin(ns);
90
91	xmlXPathFreeNodeSet(ns);
92	if (user != NULL)
93	xmlFreeNodeList((xmlNodePtr)user);
94
95	xmlXPathReturnNumber(ctxt, ret);
96	}
97
98	/**
99	* exsltMathMax:
100	* @ns: a node-set
101	*
102	* Implements the EXSLT - Math max() function:
103	* number math:max (node-set)
104	*
105	* Returns the maximum value of the nodes passed as arguments, or
106	* xmlXPathNAN if @ns is NULL or empty or if one of the nodes
107	* turns into NaN.
108	*/
109	static double
110	exsltMathMax (xmlNodeSetPtr ns) {
111	double ret, cur;
112	int i;
113
114	if ((ns == NULL) \|\| (ns->nodeNr == 0))
115	return(xmlXPathNAN);
116	ret = xmlXPathCastNodeToNumber(ns->nodeTab[0]);
117	if (xmlXPathIsNaN(ret))
118	return(xmlXPathNAN);
119	for (i = 1; i < ns->nodeNr; i++) {
120	cur = xmlXPathCastNodeToNumber(ns->nodeTab[i]);
121	if (xmlXPathIsNaN(cur))
122	return(xmlXPathNAN);
123	if (cur > ret)
124	ret = cur;
125	}
126	return(ret);
127	}
128
129	/**
130	* exsltMathMaxFunction:
131	* @ctxt: an XPath parser context
132	* @nargs: the number of arguments
133	*
134	* Wraps #exsltMathMax for use by the XPath processor.
135	*/
136	static void
137	exsltMathMaxFunction (xmlXPathParserContextPtr ctxt, int nargs) {
138	xmlNodeSetPtr ns;
139	double ret;
140	void *user = NULL;
141
142	if (nargs != 1) {
143	xmlXPathSetArityError(ctxt);
144	return;
145	}
146
147	/* We need to delay the freeing of value->user */
148	if ((ctxt->value != NULL) && (ctxt->value->boolval != 0)) {
149	user = ctxt->value->user;
150	ctxt->value->boolval = 0;
151	ctxt->value->user = 0;
152	}
153	ns = xmlXPathPopNodeSet(ctxt);
154	if (xmlXPathCheckError(ctxt))
155	return;
156
157	ret = exsltMathMax(ns);
158
159	xmlXPathFreeNodeSet(ns);
160
161	if (user != NULL)
162	xmlFreeNodeList((xmlNodePtr)user);
163	xmlXPathReturnNumber(ctxt, ret);
164	}
165
166	/**
167	* exsltMathHighest:
168	* @ns: a node-set
169	*
170	* Implements the EXSLT - Math highest() function:
171	* node-set math:highest (node-set)
172	*
173	* Returns the nodes in the node-set whose value is the maximum value
174	* for the node-set.
175	*/
176	static xmlNodeSetPtr
177	exsltMathHighest (xmlNodeSetPtr ns) {
178	xmlNodeSetPtr ret = xmlXPathNodeSetCreate(NULL);
179	double max, cur;
180	int i;
181
182	if ((ns == NULL) \|\| (ns->nodeNr == 0))
183	return(ret);
184
185	max = xmlXPathCastNodeToNumber(ns->nodeTab[0]);
186	if (xmlXPathIsNaN(max))
187	return(ret);
188	else
189	xmlXPathNodeSetAddUnique(ret, ns->nodeTab[0]);
190
191	for (i = 1; i < ns->nodeNr; i++) {
192	cur = xmlXPathCastNodeToNumber(ns->nodeTab[i]);
193	if (xmlXPathIsNaN(cur)) {
194	xmlXPathEmptyNodeSet(ret);
195	return(ret);
196	}
197	if (cur < max)
198	continue;
199	if (cur > max) {
200	max = cur;
201	xmlXPathEmptyNodeSet(ret);
202	xmlXPathNodeSetAddUnique(ret, ns->nodeTab[i]);
203	continue;
204	}
205	xmlXPathNodeSetAddUnique(ret, ns->nodeTab[i]);
206	}
207	return(ret);
208	}
209
210	/**
211	* exsltMathHighestFunction:
212	* @ctxt: an XPath parser context
213	* @nargs: the number of arguments
214	*
215	* Wraps #exsltMathHighest for use by the XPath processor
216	*/
217	static void
218	exsltMathHighestFunction (xmlXPathParserContextPtr ctxt, int nargs) {
219	xmlNodeSetPtr ns, ret;
220	void *user = NULL;
221
222	if (nargs != 1) {
223	xmlXPathSetArityError(ctxt);
224	return;
225	}
226
227	/* We need to delay the freeing of value->user */
228	if ((ctxt->value != NULL) && ctxt->value->boolval != 0) {
229	user = ctxt->value->user;
230	ctxt->value->boolval = 0;
231	ctxt->value->user = NULL;
232	}
233	ns = xmlXPathPopNodeSet(ctxt);
234	if (xmlXPathCheckError(ctxt))
235	return;
236
237	ret = exsltMathHighest(ns);
238
239	xmlXPathFreeNodeSet(ns);
240	if (user != NULL)
241	xmlFreeNodeList((xmlNodePtr)user);
242
243	xmlXPathReturnNodeSet(ctxt, ret);
244	}
245
246	/**
247	* exsltMathLowest:
248	* @ns: a node-set
249	*
250	* Implements the EXSLT - Math lowest() function
251	* node-set math:lowest (node-set)
252	*
253	* Returns the nodes in the node-set whose value is the minimum value
254	* for the node-set.
255	*/
256	static xmlNodeSetPtr
257	exsltMathLowest (xmlNodeSetPtr ns) {
258	xmlNodeSetPtr ret = xmlXPathNodeSetCreate(NULL);
259	double min, cur;
260	int i;
261
262	if ((ns == NULL) \|\| (ns->nodeNr == 0))
263	return(ret);
264
265	min = xmlXPathCastNodeToNumber(ns->nodeTab[0]);
266	if (xmlXPathIsNaN(min))
267	return(ret);
268	else
269	xmlXPathNodeSetAddUnique(ret, ns->nodeTab[0]);
270
271	for (i = 1; i < ns->nodeNr; i++) {
272	cur = xmlXPathCastNodeToNumber(ns->nodeTab[i]);
273	if (xmlXPathIsNaN(cur)) {
274	xmlXPathEmptyNodeSet(ret);
275	return(ret);
276	}
277	if (cur > min)
278	continue;
279	if (cur < min) {
280	min = cur;
281	xmlXPathEmptyNodeSet(ret);
282	xmlXPathNodeSetAddUnique(ret, ns->nodeTab[i]);
283	continue;
284	}
285	xmlXPathNodeSetAddUnique(ret, ns->nodeTab[i]);
286	}
287	return(ret);
288	}
289
290	/**
291	* exsltMathLowestFunction:
292	* @ctxt: an XPath parser context
293	* @nargs: the number of arguments
294	*
295	* Wraps #exsltMathLowest for use by the XPath processor
296	*/
297	static void
298	exsltMathLowestFunction (xmlXPathParserContextPtr ctxt, int nargs) {
299	xmlNodeSetPtr ns, ret;
300	void *user = NULL;
301
302
303	if (nargs != 1) {
304	xmlXPathSetArityError(ctxt);
305	return;
306	}
307
308	/* We need to delay the freeing of value->user */
309	if ((ctxt->value != NULL) && (ctxt->value->boolval != 0)) {
310	user = ctxt->value->user;
311	ctxt->value->boolval = 0;
312	ctxt->value->user = NULL;
313	}
314	ns = xmlXPathPopNodeSet(ctxt);
315	if (xmlXPathCheckError(ctxt))
316	return;
317
318	ret = exsltMathLowest(ns);
319
320	xmlXPathFreeNodeSet(ns);
321	if (user != NULL)
322	xmlFreeNodeList((xmlNodePtr)user);
323
324	xmlXPathReturnNodeSet(ctxt, ret);
325	}
326
327	/* math other functions */
328
329	/* constant values */
330	#define EXSLT_PI (const xmlChar *) \
331	"3.1415926535897932384626433832795028841971693993751"
332	#define EXSLT_E (const xmlChar *) \
333	"2.71828182845904523536028747135266249775724709369996"
334	#define EXSLT_SQRRT2 (const xmlChar *) \
335	"1.41421356237309504880168872420969807856967187537694"
336	#define EXSLT_LN2 (const xmlChar *) \
337	"0.69314718055994530941723212145817656807550013436025"
338	#define EXSLT_LN10 (const xmlChar *) \
339	"2.30258509299404568402"
340	#define EXSLT_LOG2E (const xmlChar *) \
341	"1.4426950408889634074"
342	#define EXSLT_SQRT1_2 (const xmlChar *) \
343	"0.70710678118654752440"
344
345	/**
346	* exsltMathConstant
347	* @name: string
348	* @precision: number
349	*
350	* Implements the EXSLT - Math constant function:
351	* number math:constant(string, number)
352	*
353	* Returns a number value of the given constant with the given precision or
354	* xmlXPathNAN if name is unknown.
355	* The constants are PI, E, SQRRT2, LN2, LN10, LOG2E, and SQRT1_2
356	*/
357	static double
358	exsltMathConstant (xmlChar *name, double precision) {
359	xmlChar *str;
360	double ret;
361
362	if ((name == NULL) \|\| (xmlXPathIsNaN(precision)) \|\| (precision < 1.0)) {
363	return xmlXPathNAN;
364	}
365
366	if (xmlStrEqual(name, BAD_CAST "PI")) {
367	int len = xmlStrlen(EXSLT_PI);
368
369	if (precision <= len)
370	len = (int)precision;
371
372	str = xmlStrsub(EXSLT_PI, 0, len);
373
374	} else if (xmlStrEqual(name, BAD_CAST "E")) {
375	int len = xmlStrlen(EXSLT_E);
376
377	if (precision <= len)
378	len = (int)precision;
379
380	str = xmlStrsub(EXSLT_E, 0, len);
381
382	} else if (xmlStrEqual(name, BAD_CAST "SQRRT2")) {
383	int len = xmlStrlen(EXSLT_SQRRT2);
384
385	if (precision <= len)
386	len = (int)precision;
387
388	str = xmlStrsub(EXSLT_SQRRT2, 0, len);
389
390	} else if (xmlStrEqual(name, BAD_CAST "LN2")) {
391	int len = xmlStrlen(EXSLT_LN2);
392
393	if (precision <= len)
394	len = (int)precision;
395
396	str = xmlStrsub(EXSLT_LN2, 0, len);
397
398	} else if (xmlStrEqual(name, BAD_CAST "LN10")) {
399	int len = xmlStrlen(EXSLT_LN10);
400
401	if (precision <= len)
402	len = (int)precision;
403
404	str = xmlStrsub(EXSLT_LN10, 0, len);
405
406	} else if (xmlStrEqual(name, BAD_CAST "LOG2E")) {
407	int len = xmlStrlen(EXSLT_LOG2E);
408
409	if (precision <= len)
410	len = (int)precision;
411
412	str = xmlStrsub(EXSLT_LOG2E, 0, len);
413
414	} else if (xmlStrEqual(name, BAD_CAST "SQRT1_2")) {
415	int len = xmlStrlen(EXSLT_SQRT1_2);
416
417	if (precision <= len)
418	len = (int)precision;
419
420	str = xmlStrsub(EXSLT_SQRT1_2, 0, len);
421
422	} else {
423	str = NULL;
424	}
425	if (str == NULL)
426	return xmlXPathNAN;
427	ret = xmlXPathCastStringToNumber(str);
428	xmlFree(str);
429	return ret;
430	}
431
432	/**
433	* exsltMathConstantFunction:
434	* @ctxt: an XPath parser context
435	* @nargs: the number of arguments
436	*
437	* Wraps #exsltMathConstant for use by the XPath processor.
438	*/
439	static void
440	exsltMathConstantFunction (xmlXPathParserContextPtr ctxt, int nargs) {
441	double ret;
442	xmlChar *name;
443
444	if (nargs != 2) {
445	xmlXPathSetArityError(ctxt);
446	return;
447	}
448	ret = xmlXPathPopNumber(ctxt);
449	if (xmlXPathCheckError(ctxt))
450	return;
451
452	name = xmlXPathPopString(ctxt);
453	if (xmlXPathCheckError(ctxt))
454	return;
455
456	ret = exsltMathConstant(name, ret);
457	if (name != NULL)
458	xmlFree(name);
459
460	xmlXPathReturnNumber(ctxt, ret);
461	}
462
463	#if defined(HAVE_STDLIB_H) && defined(RAND_MAX)
464
465	/**
466	* exsltMathRandom:
467	*
468	* Implements the EXSLT - Math random() function:
469	* number math:random ()
470	*
471	* Returns a random number between 0 and 1 inclusive.
472	*/
473	static double
474	exsltMathRandom (void) {
475	double ret;
476	int num;
477
478	num = rand();
479	ret = (double)num / (double)RAND_MAX;
480	return(ret);
481	}
482
483	/**
484	* exsltMathRandomFunction:
485	* @ctxt: an XPath parser context
486	* @nargs: the number of arguments
487	*
488	* Wraps #exsltMathRandom for use by the XPath processor.
489	*/
490	static void
491	exsltMathRandomFunction (xmlXPathParserContextPtr ctxt, int nargs) {
492	double ret;
493
494	if (nargs != 0) {
495	xmlXPathSetArityError(ctxt);
496	return;
497	}
498
499	ret = exsltMathRandom();
500
501	xmlXPathReturnNumber(ctxt, ret);
502	}
503
504	#endif /* defined(HAVE_STDLIB_H) && defined(RAND_MAX) */
505
506	#if HAVE_MATH_H
507
508	/**
509	* exsltMathAbs:
510	* @num: a double
511	*
512	* Implements the EXSLT - Math abs() function:
513	* number math:abs (number)
514	*
515	* Returns the absolute value of the argument, or xmlXPathNAN if @num is Nan.
516	*/
517	static double
518	exsltMathAbs (double num) {
519	double ret;
520
521	if (xmlXPathIsNaN(num))
522	return(xmlXPathNAN);
523	ret = fabs(num);
524	return(ret);
525	}
526
527	/**
528	* exsltMathAbsFunction:
529	* @ctxt: an XPath parser context
530	* @nargs: the number of arguments
531	*
532	* Wraps #exsltMathAbs for use by the XPath processor.
533	*/
534	static void
535	exsltMathAbsFunction (xmlXPathParserContextPtr ctxt, int nargs) {
536	double ret;
537
538	if (nargs != 1) {
539	xmlXPathSetArityError(ctxt);
540	return;
541	}
542	ret = xmlXPathPopNumber(ctxt);
543	if (xmlXPathCheckError(ctxt))
544	return;
545
546	ret = exsltMathAbs(ret);
547
548	xmlXPathReturnNumber(ctxt, ret);
549	}
550
551	/**
552	* exsltMathSqrt:
553	* @num: a double
554	*
555	* Implements the EXSLT - Math sqrt() function:
556	* number math:sqrt (number)
557	*
558	* Returns the square root of the argument, or xmlXPathNAN if @num is Nan.
559	*/
560	static double
561	exsltMathSqrt (double num) {
562	double ret;
563
564	if (xmlXPathIsNaN(num))
565	return(xmlXPathNAN);
566	ret = sqrt(num);
567	return(ret);
568	}
569
570	/**
571	* exsltMathSqrtFunction:
572	* @ctxt: an XPath parser context
573	* @nargs: the number of arguments
574	*
575	* Wraps #exsltMathSqrt for use by the XPath processor.
576	*/
577	static void
578	exsltMathSqrtFunction (xmlXPathParserContextPtr ctxt, int nargs) {
579	double ret;
580
581	if (nargs != 1) {
582	xmlXPathSetArityError(ctxt);
583	return;
584	}
585	ret = xmlXPathPopNumber(ctxt);
586	if (xmlXPathCheckError(ctxt))
587	return;
588
589	ret = exsltMathSqrt(ret);
590
591	xmlXPathReturnNumber(ctxt, ret);
592	}
593
594	/**
595	* exsltMathPower:
596	* @base: a double
597	* @power: a double
598	*
599	* Implements the EXSLT - Math power() function:
600	* number math:power (number, number)
601	*
602	* Returns the power base and power arguments, or xmlXPathNAN
603	* if either @base or @power is Nan.
604	*/
605	static double
606	exsltMathPower (double base, double power) {
607	double ret;
608
609	if ((xmlXPathIsNaN(base) \|\| xmlXPathIsNaN(power)))
610	return(xmlXPathNAN);
611	ret = pow(base, power);
612	return(ret);
613	}
614
615	/**
616	* exsltMathPower:
617	* @ctxt: an XPath parser context
618	* @nargs: the number of arguments
619	*
620	* Wraps #exsltMathPower for use by the XPath processor.
621	*/
622	static void
623	exsltMathPowerFunction (xmlXPathParserContextPtr ctxt, int nargs) {
624	double ret, base;
625
626	if (nargs != 2) {
627	xmlXPathSetArityError(ctxt);
628	return;
629	}
630	ret = xmlXPathPopNumber(ctxt);
631	if (xmlXPathCheckError(ctxt))
632	return;
633
634	/* power */
635	base = xmlXPathPopNumber(ctxt);
636	if (xmlXPathCheckError(ctxt))
637	return;
638
639	ret = exsltMathPower(base, ret);
640
641	xmlXPathReturnNumber(ctxt, ret);
642	}
643
644	/**
645	* exsltMathLog:
646	* @num: a double
647	*
648	* Implements the EXSLT - Math log() function:
649	* number math:log (number)
650	*
651	* Returns the natural log of the argument, or xmlXPathNAN if @num is Nan.
652	*/
653	static double
654	exsltMathLog (double num) {
655	double ret;
656
657	if (xmlXPathIsNaN(num))
658	return(xmlXPathNAN);
659	ret = log(num);
660	return(ret);
661	}
662
663	/**
664	* exsltMathLogFunction:
665	* @ctxt: an XPath parser context
666	* @nargs: the number of arguments
667	*
668	* Wraps #exsltMathLog for use by the XPath processor.
669	*/
670	static void
671	exsltMathLogFunction (xmlXPathParserContextPtr ctxt, int nargs) {
672	double ret;
673
674	if (nargs != 1) {
675	xmlXPathSetArityError(ctxt);
676	return;
677	}
678	ret = xmlXPathPopNumber(ctxt);
679	if (xmlXPathCheckError(ctxt))
680	return;
681
682	ret = exsltMathLog(ret);
683
684	xmlXPathReturnNumber(ctxt, ret);
685	}
686
687	/**
688	* exsltMathSin:
689	* @num: a double
690	*
691	* Implements the EXSLT - Math sin() function:
692	* number math:sin (number)
693	*
694	* Returns the sine of the argument, or xmlXPathNAN if @num is Nan.
695	*/
696	static double
697	exsltMathSin (double num) {
698	double ret;
699
700	if (xmlXPathIsNaN(num))
701	return(xmlXPathNAN);
702	ret = sin(num);
703	return(ret);
704	}
705
706	/**
707	* exsltMathSinFunction:
708	* @ctxt: an XPath parser context
709	* @nargs: the number of arguments
710	*
711	* Wraps #exsltMathSin for use by the XPath processor.
712	*/
713	static void
714	exsltMathSinFunction (xmlXPathParserContextPtr ctxt, int nargs) {
715	double ret;
716
717	if (nargs != 1) {
718	xmlXPathSetArityError(ctxt);
719	return;
720	}
721	ret = xmlXPathPopNumber(ctxt);
722	if (xmlXPathCheckError(ctxt))
723	return;
724
725	ret = exsltMathSin(ret);
726
727	xmlXPathReturnNumber(ctxt, ret);
728	}
729
730	/**
731	* exsltMathCos:
732	* @num: a double
733	*
734	* Implements the EXSLT - Math cos() function:
735	* number math:cos (number)
736	*
737	* Returns the cosine of the argument, or xmlXPathNAN if @num is Nan.
738	*/
739	static double
740	exsltMathCos (double num) {
741	double ret;
742
743	if (xmlXPathIsNaN(num))
744	return(xmlXPathNAN);
745	ret = cos(num);
746	return(ret);
747	}
748
749	/**
750	* exsltMathCosFunction:
751	* @ctxt: an XPath parser context
752	* @nargs: the number of arguments
753	*
754	* Wraps #exsltMathCos for use by the XPath processor.
755	*/
756	static void
757	exsltMathCosFunction (xmlXPathParserContextPtr ctxt, int nargs) {
758	double ret;
759
760	if (nargs != 1) {
761	xmlXPathSetArityError(ctxt);
762	return;
763	}
764	ret = xmlXPathPopNumber(ctxt);
765	if (xmlXPathCheckError(ctxt))
766	return;
767
768	ret = exsltMathCos(ret);
769
770	xmlXPathReturnNumber(ctxt, ret);
771	}
772
773	/**
774	* exsltMathTan:
775	* @num: a double
776	*
777	* Implements the EXSLT - Math tan() function:
778	* number math:tan (number)
779	*
780	* Returns the tangent of the argument, or xmlXPathNAN if @num is Nan.
781	*/
782	static double
783	exsltMathTan (double num) {
784	double ret;
785
786	if (xmlXPathIsNaN(num))
787	return(xmlXPathNAN);
788	ret = tan(num);
789	return(ret);
790	}
791
792	/**
793	* exsltMathTanFunction:
794	* @ctxt: an XPath parser context
795	* @nargs: the number of arguments
796	*
797	* Wraps #exsltMathTan for use by the XPath processor.
798	*/
799	static void
800	exsltMathTanFunction (xmlXPathParserContextPtr ctxt, int nargs) {
801	double ret;
802
803	if (nargs != 1) {
804	xmlXPathSetArityError(ctxt);
805	return;
806	}
807	ret = xmlXPathPopNumber(ctxt);
808	if (xmlXPathCheckError(ctxt))
809	return;
810
811	ret = exsltMathTan(ret);
812
813	xmlXPathReturnNumber(ctxt, ret);
814	}
815
816	/**
817	* exsltMathAsin:
818	* @num: a double
819	*
820	* Implements the EXSLT - Math asin() function:
821	* number math:asin (number)
822	*
823	* Returns the arc sine of the argument, or xmlXPathNAN if @num is Nan.
824	*/
825	static double
826	exsltMathAsin (double num) {
827	double ret;
828
829	if (xmlXPathIsNaN(num))
830	return(xmlXPathNAN);
831	ret = asin(num);
832	return(ret);
833	}
834
835	/**
836	* exsltMathAsinFunction:
837	* @ctxt: an XPath parser context
838	* @nargs: the number of arguments
839	*
840	* Wraps #exsltMathAsin for use by the XPath processor.
841	*/
842	static void
843	exsltMathAsinFunction (xmlXPathParserContextPtr ctxt, int nargs) {
844	double ret;
845
846	if (nargs != 1) {
847	xmlXPathSetArityError(ctxt);
848	return;
849	}
850	ret = xmlXPathPopNumber(ctxt);
851	if (xmlXPathCheckError(ctxt))
852	return;
853
854	ret = exsltMathAsin(ret);
855
856	xmlXPathReturnNumber(ctxt, ret);
857	}
858
859	/**
860	* exsltMathAcos:
861	* @num: a double
862	*
863	* Implements the EXSLT - Math acos() function:
864	* number math:acos (number)
865	*
866	* Returns the arc cosine of the argument, or xmlXPathNAN if @num is Nan.
867	*/
868	static double
869	exsltMathAcos (double num) {
870	double ret;
871
872	if (xmlXPathIsNaN(num))
873	return(xmlXPathNAN);
874	ret = acos(num);
875	return(ret);
876	}
877
878	/**
879	* exsltMathAcosFunction:
880	* @ctxt: an XPath parser context
881	* @nargs: the number of arguments
882	*
883	* Wraps #exsltMathAcos for use by the XPath processor.
884	*/
885	static void
886	exsltMathAcosFunction (xmlXPathParserContextPtr ctxt, int nargs) {
887	double ret;
888
889	if (nargs != 1) {
890	xmlXPathSetArityError(ctxt);
891	return;
892	}
893	ret = xmlXPathPopNumber(ctxt);
894	if (xmlXPathCheckError(ctxt))
895	return;
896
897	ret = exsltMathAcos(ret);
898
899	xmlXPathReturnNumber(ctxt, ret);
900	}
901
902	/**
903	* exsltMathAtan:
904	* @num: a double
905	*
906	* Implements the EXSLT - Math atan() function:
907	* number math:atan (number)
908	*
909	* Returns the arc tangent of the argument, or xmlXPathNAN if @num is Nan.
910	*/
911	static double
912	exsltMathAtan (double num) {
913	double ret;
914
915	if (xmlXPathIsNaN(num))
916	return(xmlXPathNAN);
917	ret = atan(num);
918	return(ret);
919	}
920
921	/**
922	* exsltMathAtanFunction:
923	* @ctxt: an XPath parser context
924	* @nargs: the number of arguments
925	*
926	* Wraps #exsltMathAtan for use by the XPath processor.
927	*/
928	static void
929	exsltMathAtanFunction (xmlXPathParserContextPtr ctxt, int nargs) {
930	double ret;
931
932	if (nargs != 1) {
933	xmlXPathSetArityError(ctxt);
934	return;
935	}
936	ret = xmlXPathPopNumber(ctxt);
937	if (xmlXPathCheckError(ctxt))
938	return;
939
940	ret = exsltMathAtan(ret);
941
942	xmlXPathReturnNumber(ctxt, ret);
943	}
944
945	/**
946	* exsltMathAtan2:
947	* @y: a double
948	* @x: a double
949	*
950	* Implements the EXSLT - Math atan2() function:
951	* number math:atan2 (number, number)
952	*
953	* Returns the arc tangent function of the y/x arguments, or xmlXPathNAN
954	* if either @y or @x is Nan.
955	*/
956	static double
957	exsltMathAtan2 (double y, double x) {
958	double ret;
959
960	if ((xmlXPathIsNaN(y) \|\| xmlXPathIsNaN(x)))
961	return(xmlXPathNAN);
962	ret = atan2(y, x);
963	return(ret);
964	}
965
966	/**
967	* exsltMathAtan2Function:
968	* @ctxt: an XPath parser context
969	* @nargs: the number of arguments
970	*
971	* Wraps #exsltMathAtan2 for use by the XPath processor.
972	*/
973	static void
974	exsltMathAtan2Function (xmlXPathParserContextPtr ctxt, int nargs) {
975	double ret, y;
976
977	if (nargs != 2) {
978	xmlXPathSetArityError(ctxt);
979	return;
980	}
981	y = xmlXPathPopNumber(ctxt);
982	if (xmlXPathCheckError(ctxt))
983	return;
984
985	/* x */
986	ret = xmlXPathPopNumber(ctxt);
987	if (xmlXPathCheckError(ctxt))
988	return;
989
990	ret = exsltMathAtan2(y, ret);
991
992	xmlXPathReturnNumber(ctxt, ret);
993	}
994
995	/**
996	* exsltMathExp:
997	* @num: a double
998	*
999	* Implements the EXSLT - Math exp() function:
1000	* number math:exp (number)
1001	*
1002	* Returns the exponential function of the argument, or xmlXPathNAN if
1003	* @num is Nan.
1004	*/
1005	static double
1006	exsltMathExp (double num) {
1007	double ret;
1008
1009	if (xmlXPathIsNaN(num))
1010	return(xmlXPathNAN);
1011	ret = exp(num);
1012	return(ret);
1013	}
1014
1015	/**
1016	* exsltMathExpFunction:
1017	* @ctxt: an XPath parser context
1018	* @nargs: the number of arguments
1019	*
1020	* Wraps #exsltMathExp for use by the XPath processor.
1021	*/
1022	static void
1023	exsltMathExpFunction (xmlXPathParserContextPtr ctxt, int nargs) {
1024	double ret;
1025
1026	if (nargs != 1) {
1027	xmlXPathSetArityError(ctxt);
1028	return;
1029	}
1030	ret = xmlXPathPopNumber(ctxt);
1031	if (xmlXPathCheckError(ctxt))
1032	return;
1033
1034	ret = exsltMathExp(ret);
1035
1036	xmlXPathReturnNumber(ctxt, ret);
1037	}
1038
1039	#endif /* HAVE_MATH_H */
1040
1041	/**
1042	* exsltMathRegister:
1043	*
1044	* Registers the EXSLT - Math module
1045	*/
1046
1047	void
1048	exsltMathRegister (void) {
1049	xsltRegisterExtModuleFunction ((const xmlChar *) "min",
1050	EXSLT_MATH_NAMESPACE,
1051	exsltMathMinFunction);
1052	xsltRegisterExtModuleFunction ((const xmlChar *) "max",
1053	EXSLT_MATH_NAMESPACE,
1054	exsltMathMaxFunction);
1055	xsltRegisterExtModuleFunction ((const xmlChar *) "highest",
1056	EXSLT_MATH_NAMESPACE,
1057	exsltMathHighestFunction);
1058	xsltRegisterExtModuleFunction ((const xmlChar *) "lowest",
1059	EXSLT_MATH_NAMESPACE,
1060	exsltMathLowestFunction);
1061	/* register other math functions */
1062	xsltRegisterExtModuleFunction ((const xmlChar *) "constant",
1063	EXSLT_MATH_NAMESPACE,
1064	exsltMathConstantFunction);
1065	#ifdef HAVE_STDLIB_H
1066	xsltRegisterExtModuleFunction ((const xmlChar *) "random",
1067	EXSLT_MATH_NAMESPACE,
1068	exsltMathRandomFunction);
1069	#endif
1070	#if HAVE_MATH_H
1071	xsltRegisterExtModuleFunction ((const xmlChar *) "abs",
1072	EXSLT_MATH_NAMESPACE,
1073	exsltMathAbsFunction);
1074	xsltRegisterExtModuleFunction ((const xmlChar *) "sqrt",
1075	EXSLT_MATH_NAMESPACE,
1076	exsltMathSqrtFunction);
1077	xsltRegisterExtModuleFunction ((const xmlChar *) "power",
1078	EXSLT_MATH_NAMESPACE,
1079	exsltMathPowerFunction);
1080	xsltRegisterExtModuleFunction ((const xmlChar *) "log",
1081	EXSLT_MATH_NAMESPACE,
1082	exsltMathLogFunction);
1083	xsltRegisterExtModuleFunction ((const xmlChar *) "sin",
1084	EXSLT_MATH_NAMESPACE,
1085	exsltMathSinFunction);
1086	xsltRegisterExtModuleFunction ((const xmlChar *) "cos",
1087	EXSLT_MATH_NAMESPACE,
1088	exsltMathCosFunction);
1089	xsltRegisterExtModuleFunction ((const xmlChar *) "tan",
1090	EXSLT_MATH_NAMESPACE,
1091	exsltMathTanFunction);
1092	xsltRegisterExtModuleFunction ((const xmlChar *) "asin",
1093	EXSLT_MATH_NAMESPACE,
1094	exsltMathAsinFunction);
1095	xsltRegisterExtModuleFunction ((const xmlChar *) "acos",
1096	EXSLT_MATH_NAMESPACE,
1097	exsltMathAcosFunction);
1098	xsltRegisterExtModuleFunction ((const xmlChar *) "atan",
1099	EXSLT_MATH_NAMESPACE,
1100	exsltMathAtanFunction);
1101	xsltRegisterExtModuleFunction ((const xmlChar *) "atan2",
1102	EXSLT_MATH_NAMESPACE,
1103	exsltMathAtan2Function);
1104	xsltRegisterExtModuleFunction ((const xmlChar *) "exp",
1105	EXSLT_MATH_NAMESPACE,
1106	exsltMathExpFunction);
1107	#endif
1108	}

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