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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
* Copyright (C) 2002-2012, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: uenum.c
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:2
*
* created on: 2002jul08
* created by: Vladimir Weinstein
*/
#include "unicode/putil.h"
#include "uenumimp.h"
#include "cmemory.h"
/* Layout of the baseContext buffer. */
typedef struct {
int32_t len; /* number of bytes available starting at 'data' */
char data; /* actual data starts here */
} _UEnumBuffer;
/* Extra bytes to allocate in the baseContext buffer. */
static const int32_t PAD = 8;
/* Return a pointer to the baseContext buffer, possibly allocating
or reallocating it if at least 'capacity' bytes are not available. */
static void* _getBuffer(UEnumeration* en, int32_t capacity) {
if (en->baseContext != NULL) {
if (((_UEnumBuffer*) en->baseContext)->len < capacity) {
capacity += PAD;
en->baseContext = uprv_realloc(en->baseContext,
sizeof(int32_t) + capacity);
if (en->baseContext == NULL) {
return NULL;
}
((_UEnumBuffer*) en->baseContext)->len = capacity;
}
} else {
capacity += PAD;
en->baseContext = uprv_malloc(sizeof(int32_t) + capacity);
if (en->baseContext == NULL) {
return NULL;
}
((_UEnumBuffer*) en->baseContext)->len = capacity;
}
return (void*) & ((_UEnumBuffer*) en->baseContext)->data;
}
U_CAPI void U_EXPORT2
uenum_close(UEnumeration* en)
{
if (en) {
if (en->close != NULL) {
if (en->baseContext) {
uprv_free(en->baseContext);
}
en->close(en);
} else { /* this seems dangerous, but we better kill the object */
uprv_free(en);
}
}
}
U_CAPI int32_t U_EXPORT2
uenum_count(UEnumeration* en, UErrorCode* status)
{
if (!en || U_FAILURE(*status)) {
return -1;
}
if (en->count != NULL) {
return en->count(en, status);
} else {
*status = U_UNSUPPORTED_ERROR;
return -1;
}
}
/* Don't call this directly. Only uenum_unext should be calling this. */
U_CAPI const UChar* U_EXPORT2
uenum_unextDefault(UEnumeration* en,
int32_t* resultLength,
UErrorCode* status)
{
UChar *ustr = NULL;
int32_t len = 0;
if (en->next != NULL) {
const char *cstr = en->next(en, &len, status);
if (cstr != NULL) {
ustr = (UChar*) _getBuffer(en, (len+1) * sizeof(UChar));
if (ustr == NULL) {
*status = U_MEMORY_ALLOCATION_ERROR;
} else {
u_charsToUChars(cstr, ustr, len+1);
}
}
} else {
*status = U_UNSUPPORTED_ERROR;
}
if (resultLength) {
*resultLength = len;
}
return ustr;
}
/* Don't call this directly. Only uenum_next should be calling this. */
U_CAPI const char* U_EXPORT2
uenum_nextDefault(UEnumeration* en,
int32_t* resultLength,
UErrorCode* status)
{
if (en->uNext != NULL) {
char *tempCharVal;
const UChar *tempUCharVal = en->uNext(en, resultLength, status);
if (tempUCharVal == NULL) {
return NULL;
}
tempCharVal = (char*)
_getBuffer(en, (*resultLength+1) * sizeof(char));
if (!tempCharVal) {
*status = U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
u_UCharsToChars(tempUCharVal, tempCharVal, *resultLength + 1);
return tempCharVal;
} else {
*status = U_UNSUPPORTED_ERROR;
return NULL;
}
}
U_CAPI const UChar* U_EXPORT2
uenum_unext(UEnumeration* en,
int32_t* resultLength,
UErrorCode* status)
{
if (!en || U_FAILURE(*status)) {
return NULL;
}
if (en->uNext != NULL) {
return en->uNext(en, resultLength, status);
} else {
*status = U_UNSUPPORTED_ERROR;
return NULL;
}
}
U_CAPI const char* U_EXPORT2
uenum_next(UEnumeration* en,
int32_t* resultLength,
UErrorCode* status)
{
if (!en || U_FAILURE(*status)) {
return NULL;
}
if (en->next != NULL) {
if (resultLength != NULL) {
return en->next(en, resultLength, status);
}
else {
int32_t dummyLength=0;
return en->next(en, &dummyLength, status);
}
} else {
*status = U_UNSUPPORTED_ERROR;
return NULL;
}
}
U_CAPI void U_EXPORT2
uenum_reset(UEnumeration* en, UErrorCode* status)
{
if (!en || U_FAILURE(*status)) {
return;
}
if (en->reset != NULL) {
en->reset(en, status);
} else {
*status = U_UNSUPPORTED_ERROR;
}
}
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