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authordan miller2007-10-20 05:34:26 +0000
committerdan miller2007-10-20 05:34:26 +0000
commit354ea97baf765759911f0c56d3ed511350ebe348 (patch)
tree1adf96a98045d24b8741ba02bf21d195e70993ca /libraries/sqlite/win32/malloc.c
parentsqlite source (unix build) added to libraries (diff)
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sqlite 3.5.1 windows source
Diffstat (limited to 'libraries/sqlite/win32/malloc.c')
-rwxr-xr-xlibraries/sqlite/win32/malloc.c240
1 files changed, 240 insertions, 0 deletions
diff --git a/libraries/sqlite/win32/malloc.c b/libraries/sqlite/win32/malloc.c
new file mode 100755
index 0000000..bc321ab
--- /dev/null
+++ b/libraries/sqlite/win32/malloc.c
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1/*
2** 2001 September 15
3**
4** The author disclaims copyright to this source code. In place of
5** a legal notice, here is a blessing:
6**
7** May you do good and not evil.
8** May you find forgiveness for yourself and forgive others.
9** May you share freely, never taking more than you give.
10**
11*************************************************************************
12** Memory allocation functions used throughout sqlite.
13**
14**
15** $Id: malloc.c,v 1.13 2007/08/29 14:06:23 danielk1977 Exp $
16*/
17#include "sqliteInt.h"
18#include <stdarg.h>
19#include <ctype.h>
20
21/*
22** This routine runs when the memory allocator sees that the
23** total memory allocation is about to exceed the soft heap
24** limit.
25*/
26static void softHeapLimitEnforcer(
27 void *NotUsed,
28 sqlite3_int64 inUse,
29 int allocSize
30){
31 sqlite3_release_memory(allocSize);
32}
33
34/*
35** Set the soft heap-size limit for the current thread. Passing a
36** zero or negative value indicates no limit.
37*/
38void sqlite3_soft_heap_limit(int n){
39 sqlite3_uint64 iLimit;
40 int overage;
41 if( n<0 ){
42 iLimit = 0;
43 }else{
44 iLimit = n;
45 }
46 if( iLimit>0 ){
47 sqlite3_memory_alarm(softHeapLimitEnforcer, 0, iLimit);
48 }else{
49 sqlite3_memory_alarm(0, 0, 0);
50 }
51 overage = sqlite3_memory_used() - n;
52 if( overage>0 ){
53 sqlite3_release_memory(overage);
54 }
55}
56
57/*
58** Release memory held by SQLite instances created by the current thread.
59*/
60int sqlite3_release_memory(int n){
61#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
62 return sqlite3PagerReleaseMemory(n);
63#else
64 return SQLITE_OK;
65#endif
66}
67
68
69/*
70** Allocate and zero memory.
71*/
72void *sqlite3MallocZero(unsigned n){
73 void *p = sqlite3_malloc(n);
74 if( p ){
75 memset(p, 0, n);
76 }
77 return p;
78}
79
80/*
81** Allocate and zero memory. If the allocation fails, make
82** the mallocFailed flag in the connection pointer.
83*/
84void *sqlite3DbMallocZero(sqlite3 *db, unsigned n){
85 void *p = sqlite3DbMallocRaw(db, n);
86 if( p ){
87 memset(p, 0, n);
88 }
89 return p;
90}
91
92/*
93** Allocate and zero memory. If the allocation fails, make
94** the mallocFailed flag in the connection pointer.
95*/
96void *sqlite3DbMallocRaw(sqlite3 *db, unsigned n){
97 void *p = 0;
98 if( !db || db->mallocFailed==0 ){
99 p = sqlite3_malloc(n);
100 if( !p && db ){
101 db->mallocFailed = 1;
102 }
103 }
104 return p;
105}
106
107/*
108** Resize the block of memory pointed to by p to n bytes. If the
109** resize fails, set the mallocFailed flag inthe connection object.
110*/
111void *sqlite3DbRealloc(sqlite3 *db, void *p, int n){
112 void *pNew = 0;
113 if( db->mallocFailed==0 ){
114 pNew = sqlite3_realloc(p, n);
115 if( !pNew ){
116 db->mallocFailed = 1;
117 }
118 }
119 return pNew;
120}
121
122/*
123** Attempt to reallocate p. If the reallocation fails, then free p
124** and set the mallocFailed flag in the database connection.
125*/
126void *sqlite3DbReallocOrFree(sqlite3 *db, void *p, int n){
127 void *pNew;
128 pNew = sqlite3DbRealloc(db, p, n);
129 if( !pNew ){
130 sqlite3_free(p);
131 }
132 return pNew;
133}
134
135/*
136** Make a copy of a string in memory obtained from sqliteMalloc(). These
137** functions call sqlite3MallocRaw() directly instead of sqliteMalloc(). This
138** is because when memory debugging is turned on, these two functions are
139** called via macros that record the current file and line number in the
140** ThreadData structure.
141*/
142char *sqlite3StrDup(const char *z){
143 char *zNew;
144 int n;
145 if( z==0 ) return 0;
146 n = strlen(z)+1;
147 zNew = sqlite3_malloc(n);
148 if( zNew ) memcpy(zNew, z, n);
149 return zNew;
150}
151char *sqlite3StrNDup(const char *z, int n){
152 char *zNew;
153 if( z==0 ) return 0;
154 zNew = sqlite3_malloc(n+1);
155 if( zNew ){
156 memcpy(zNew, z, n);
157 zNew[n] = 0;
158 }
159 return zNew;
160}
161
162char *sqlite3DbStrDup(sqlite3 *db, const char *z){
163 char *zNew = sqlite3StrDup(z);
164 if( z && !zNew ){
165 db->mallocFailed = 1;
166 }
167 return zNew;
168}
169char *sqlite3DbStrNDup(sqlite3 *db, const char *z, int n){
170 char *zNew = sqlite3StrNDup(z, n);
171 if( z && !zNew ){
172 db->mallocFailed = 1;
173 }
174 return zNew;
175}
176
177/*
178** Create a string from the 2nd and subsequent arguments (up to the
179** first NULL argument), store the string in memory obtained from
180** sqliteMalloc() and make the pointer indicated by the 1st argument
181** point to that string. The 1st argument must either be NULL or
182** point to memory obtained from sqliteMalloc().
183*/
184void sqlite3SetString(char **pz, ...){
185 va_list ap;
186 int nByte;
187 const char *z;
188 char *zResult;
189
190 assert( pz!=0 );
191 nByte = 1;
192 va_start(ap, pz);
193 while( (z = va_arg(ap, const char*))!=0 ){
194 nByte += strlen(z);
195 }
196 va_end(ap);
197 sqlite3_free(*pz);
198 *pz = zResult = sqlite3_malloc(nByte);
199 if( zResult==0 ){
200 return;
201 }
202 *zResult = 0;
203 va_start(ap, pz);
204 while( (z = va_arg(ap, const char*))!=0 ){
205 int n = strlen(z);
206 memcpy(zResult, z, n);
207 zResult += n;
208 }
209 zResult[0] = 0;
210 va_end(ap);
211}
212
213
214/*
215** This function must be called before exiting any API function (i.e.
216** returning control to the user) that has called sqlite3_malloc or
217** sqlite3_realloc.
218**
219** The returned value is normally a copy of the second argument to this
220** function. However, if a malloc() failure has occured since the previous
221** invocation SQLITE_NOMEM is returned instead.
222**
223** If the first argument, db, is not NULL and a malloc() error has occured,
224** then the connection error-code (the value returned by sqlite3_errcode())
225** is set to SQLITE_NOMEM.
226*/
227int sqlite3ApiExit(sqlite3* db, int rc){
228 /* If the db handle is not NULL, then we must hold the connection handle
229 ** mutex here. Otherwise the read (and possible write) of db->mallocFailed
230 ** is unsafe, as is the call to sqlite3Error().
231 */
232 assert( !db || sqlite3_mutex_held(db->mutex) );
233 if( db && db->mallocFailed ){
234 sqlite3Error(db, SQLITE_NOMEM, 0);
235 db->mallocFailed = 0;
236 rc = SQLITE_NOMEM;
237 }
238 return rc & (db ? db->errMask : 0xff);
239}
240