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1/*
2*******************************************************************************
3*
374ca955 4* Copyright (C) 2002-2004, International Business Machines
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5* Corporation and others. All Rights Reserved.
6*
7*******************************************************************************
8* file name: uenum.c
9* encoding: US-ASCII
10* tab size: 8 (not used)
11* indentation:2
12*
13* created on: 2002jul08
14* created by: Vladimir Weinstein
15*/
16
374ca955 17#include "unicode/putil.h"
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18#include "uenumimp.h"
19#include "cmemory.h"
20
21/* Layout of the baseContext buffer. */
22typedef struct {
23 int32_t len; /* number of bytes available starting at 'data' */
24 char data; /* actual data starts here */
25} _UEnumBuffer;
26
27/* Extra bytes to allocate in the baseContext buffer. */
28static const int32_t PAD = 8;
29
30/* Return a pointer to the baseContext buffer, possibly allocating
31 or reallocating it if at least 'capacity' bytes are not available. */
32static void* _getBuffer(UEnumeration* en, int32_t capacity) {
33
34 if (en->baseContext != NULL) {
35 if (((_UEnumBuffer*) en->baseContext)->len < capacity) {
36 capacity += PAD;
37 en->baseContext = uprv_realloc(en->baseContext,
38 sizeof(int32_t) + capacity);
39 if (en->baseContext == NULL) {
40 return NULL;
41 }
42 ((_UEnumBuffer*) en->baseContext)->len = capacity;
43 }
44 } else {
45 capacity += PAD;
46 en->baseContext = uprv_malloc(sizeof(int32_t) + capacity);
47 if (en->baseContext == NULL) {
48 return NULL;
49 }
50 ((_UEnumBuffer*) en->baseContext)->len = capacity;
51 }
52
53 return (void*) & ((_UEnumBuffer*) en->baseContext)->data;
54}
55
56U_CAPI void U_EXPORT2
57uenum_close(UEnumeration* en)
58{
59 if (en) {
60 if (en->close != NULL) {
61 if (en->baseContext) {
62 uprv_free(en->baseContext);
63 }
64 en->close(en);
65 } else { /* this seems dangerous, but we better kill the object */
66 uprv_free(en);
67 }
68 }
69}
70
71U_CAPI int32_t U_EXPORT2
72uenum_count(UEnumeration* en, UErrorCode* status)
73{
74 if (!en || U_FAILURE(*status)) {
75 return -1;
76 }
77 if (en->count != NULL) {
78 return en->count(en, status);
79 } else {
80 *status = U_UNSUPPORTED_ERROR;
81 return -1;
82 }
83}
84
85/* Don't call this directly. Only uenum_unext should be calling this. */
86U_CAPI const UChar* U_EXPORT2
87uenum_unextDefault(UEnumeration* en,
88 int32_t* resultLength,
89 UErrorCode* status)
90{
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91 UChar *ustr = NULL;
92 int32_t len = 0;
b75a7d8f 93 if (en->next != NULL) {
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94 const char *cstr = en->next(en, &len, status);
95 if (cstr != NULL) {
96 ustr = (UChar*) _getBuffer(en, (len+1) * sizeof(UChar));
97 if (ustr == NULL) {
98 *status = U_MEMORY_ALLOCATION_ERROR;
99 } else {
100 u_charsToUChars(cstr, ustr, len+1);
101 }
b75a7d8f 102 }
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103 } else {
104 *status = U_UNSUPPORTED_ERROR;
b75a7d8f 105 }
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106 if (resultLength) {
107 *resultLength = len;
108 }
109 return ustr;
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110}
111
112/* Don't call this directly. Only uenum_next should be calling this. */
113U_CAPI const char* U_EXPORT2
114uenum_nextDefault(UEnumeration* en,
115 int32_t* resultLength,
116 UErrorCode* status)
117{
118 if (en->uNext != NULL) {
119 char *tempCharVal;
120 const UChar *tempUCharVal = en->uNext(en, resultLength, status);
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121 if (tempUCharVal == NULL) {
122 return NULL;
123 }
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124 tempCharVal = (char*)
125 _getBuffer(en, (*resultLength+1) * sizeof(char));
126 if (!tempCharVal) {
127 *status = U_MEMORY_ALLOCATION_ERROR;
128 return NULL;
129 }
130 u_UCharsToChars(tempUCharVal, tempCharVal, *resultLength + 1);
131 return tempCharVal;
132 } else {
133 *status = U_UNSUPPORTED_ERROR;
134 return NULL;
135 }
136}
137
138U_CAPI const UChar* U_EXPORT2
139uenum_unext(UEnumeration* en,
140 int32_t* resultLength,
141 UErrorCode* status)
142{
143 if (!en || U_FAILURE(*status)) {
144 return NULL;
145 }
146 if (en->uNext != NULL) {
147 return en->uNext(en, resultLength, status);
148 } else {
149 *status = U_UNSUPPORTED_ERROR;
150 return NULL;
151 }
152}
153
154U_CAPI const char* U_EXPORT2
155uenum_next(UEnumeration* en,
156 int32_t* resultLength,
157 UErrorCode* status)
158{
159 if (!en || U_FAILURE(*status)) {
160 return NULL;
161 }
162 if (en->next != NULL) {
163 return en->next(en, resultLength, status);
164 } else {
165 *status = U_UNSUPPORTED_ERROR;
166 return NULL;
167 }
168}
169
170U_CAPI void U_EXPORT2
171uenum_reset(UEnumeration* en, UErrorCode* status)
172{
173 if (!en || U_FAILURE(*status)) {
174 return;
175 }
176 if (en->reset != NULL) {
177 en->reset(en, status);
178 } else {
179 *status = U_UNSUPPORTED_ERROR;
180 }
181}