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intl/icu/source/common/uenum.c@b8a032363ba2 (annotated)

intl/icu/source/common/uenum.c

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/*
michael@0	2	*******************************************************************************
michael@0	3	*
michael@0	4	* Copyright (C) 2002-2012, International Business Machines
michael@0	5	* Corporation and others. All Rights Reserved.
michael@0	6	*
michael@0	7	*******************************************************************************
michael@0	8	* file name: uenum.c
michael@0	9	* encoding: US-ASCII
michael@0	10	* tab size: 8 (not used)
michael@0	11	* indentation:2
michael@0	12	*
michael@0	13	* created on: 2002jul08
michael@0	14	* created by: Vladimir Weinstein
michael@0	15	*/
michael@0	16
michael@0	17	#include "unicode/putil.h"
michael@0	18	#include "uenumimp.h"
michael@0	19	#include "cmemory.h"
michael@0	20
michael@0	21	/* Layout of the baseContext buffer. */
michael@0	22	typedef struct {
michael@0	23	int32_t len; /* number of bytes available starting at 'data' */
michael@0	24	char data; /* actual data starts here */
michael@0	25	} _UEnumBuffer;
michael@0	26
michael@0	27	/* Extra bytes to allocate in the baseContext buffer. */
michael@0	28	static const int32_t PAD = 8;
michael@0	29
michael@0	30	/* Return a pointer to the baseContext buffer, possibly allocating
michael@0	31	or reallocating it if at least 'capacity' bytes are not available. */
michael@0	32	static void* _getBuffer(UEnumeration* en, int32_t capacity) {
michael@0	33
michael@0	34	if (en->baseContext != NULL) {
michael@0	35	if (((_UEnumBuffer*) en->baseContext)->len < capacity) {
michael@0	36	capacity += PAD;
michael@0	37	en->baseContext = uprv_realloc(en->baseContext,
michael@0	38	sizeof(int32_t) + capacity);
michael@0	39	if (en->baseContext == NULL) {
michael@0	40	return NULL;
michael@0	41	}
michael@0	42	((_UEnumBuffer*) en->baseContext)->len = capacity;
michael@0	43	}
michael@0	44	} else {
michael@0	45	capacity += PAD;
michael@0	46	en->baseContext = uprv_malloc(sizeof(int32_t) + capacity);
michael@0	47	if (en->baseContext == NULL) {
michael@0	48	return NULL;
michael@0	49	}
michael@0	50	((_UEnumBuffer*) en->baseContext)->len = capacity;
michael@0	51	}
michael@0	52
michael@0	53	return (void*) & ((_UEnumBuffer*) en->baseContext)->data;
michael@0	54	}
michael@0	55
michael@0	56	U_CAPI void U_EXPORT2
michael@0	57	uenum_close(UEnumeration* en)
michael@0	58	{
michael@0	59	if (en) {
michael@0	60	if (en->close != NULL) {
michael@0	61	if (en->baseContext) {
michael@0	62	uprv_free(en->baseContext);
michael@0	63	}
michael@0	64	en->close(en);
michael@0	65	} else { /* this seems dangerous, but we better kill the object */
michael@0	66	uprv_free(en);
michael@0	67	}
michael@0	68	}
michael@0	69	}
michael@0	70
michael@0	71	U_CAPI int32_t U_EXPORT2
michael@0	72	uenum_count(UEnumeration* en, UErrorCode* status)
michael@0	73	{
michael@0	74	if (!en || U_FAILURE(*status)) {
michael@0	75	return -1;
michael@0	76	}
michael@0	77	if (en->count != NULL) {
michael@0	78	return en->count(en, status);
michael@0	79	} else {
michael@0	80	*status = U_UNSUPPORTED_ERROR;
michael@0	81	return -1;
michael@0	82	}
michael@0	83	}
michael@0	84
michael@0	85	/* Don't call this directly. Only uenum_unext should be calling this. */
michael@0	86	U_CAPI const UChar* U_EXPORT2
michael@0	87	uenum_unextDefault(UEnumeration* en,
michael@0	88	int32_t* resultLength,
michael@0	89	UErrorCode* status)
michael@0	90	{
michael@0	91	UChar *ustr = NULL;
michael@0	92	int32_t len = 0;
michael@0	93	if (en->next != NULL) {
michael@0	94	const char *cstr = en->next(en, &len, status);
michael@0	95	if (cstr != NULL) {
michael@0	96	ustr = (UChar*) _getBuffer(en, (len+1) * sizeof(UChar));
michael@0	97	if (ustr == NULL) {
michael@0	98	*status = U_MEMORY_ALLOCATION_ERROR;
michael@0	99	} else {
michael@0	100	u_charsToUChars(cstr, ustr, len+1);
michael@0	101	}
michael@0	102	}
michael@0	103	} else {
michael@0	104	*status = U_UNSUPPORTED_ERROR;
michael@0	105	}
michael@0	106	if (resultLength) {
michael@0	107	*resultLength = len;
michael@0	108	}
michael@0	109	return ustr;
michael@0	110	}
michael@0	111
michael@0	112	/* Don't call this directly. Only uenum_next should be calling this. */
michael@0	113	U_CAPI const char* U_EXPORT2
michael@0	114	uenum_nextDefault(UEnumeration* en,
michael@0	115	int32_t* resultLength,
michael@0	116	UErrorCode* status)
michael@0	117	{
michael@0	118	if (en->uNext != NULL) {
michael@0	119	char *tempCharVal;
michael@0	120	const UChar *tempUCharVal = en->uNext(en, resultLength, status);
michael@0	121	if (tempUCharVal == NULL) {
michael@0	122	return NULL;
michael@0	123	}
michael@0	124	tempCharVal = (char*)
michael@0	125	_getBuffer(en, (*resultLength+1) * sizeof(char));
michael@0	126	if (!tempCharVal) {
michael@0	127	*status = U_MEMORY_ALLOCATION_ERROR;
michael@0	128	return NULL;
michael@0	129	}
michael@0	130	u_UCharsToChars(tempUCharVal, tempCharVal, *resultLength + 1);
michael@0	131	return tempCharVal;
michael@0	132	} else {
michael@0	133	*status = U_UNSUPPORTED_ERROR;
michael@0	134	return NULL;
michael@0	135	}
michael@0	136	}
michael@0	137
michael@0	138	U_CAPI const UChar* U_EXPORT2
michael@0	139	uenum_unext(UEnumeration* en,
michael@0	140	int32_t* resultLength,
michael@0	141	UErrorCode* status)
michael@0	142	{
michael@0	143	if (!en || U_FAILURE(*status)) {
michael@0	144	return NULL;
michael@0	145	}
michael@0	146	if (en->uNext != NULL) {
michael@0	147	return en->uNext(en, resultLength, status);
michael@0	148	} else {
michael@0	149	*status = U_UNSUPPORTED_ERROR;
michael@0	150	return NULL;
michael@0	151	}
michael@0	152	}
michael@0	153
michael@0	154	U_CAPI const char* U_EXPORT2
michael@0	155	uenum_next(UEnumeration* en,
michael@0	156	int32_t* resultLength,
michael@0	157	UErrorCode* status)
michael@0	158	{
michael@0	159	if (!en || U_FAILURE(*status)) {
michael@0	160	return NULL;
michael@0	161	}
michael@0	162	if (en->next != NULL) {
michael@0	163	if (resultLength != NULL) {
michael@0	164	return en->next(en, resultLength, status);
michael@0	165	}
michael@0	166	else {
michael@0	167	int32_t dummyLength=0;
michael@0	168	return en->next(en, &dummyLength, status);
michael@0	169	}
michael@0	170	} else {
michael@0	171	*status = U_UNSUPPORTED_ERROR;
michael@0	172	return NULL;
michael@0	173	}
michael@0	174	}
michael@0	175
michael@0	176	U_CAPI void U_EXPORT2
michael@0	177	uenum_reset(UEnumeration* en, UErrorCode* status)
michael@0	178	{
michael@0	179	if (!en || U_FAILURE(*status)) {
michael@0	180	return;
michael@0	181	}
michael@0	182	if (en->reset != NULL) {
michael@0	183	en->reset(en, status);
michael@0	184	} else {
michael@0	185	*status = U_UNSUPPORTED_ERROR;
michael@0	186	}
michael@0	187	}