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1/*
2** 2005 November 29
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**
13** This file contains OS interface code that is common to all
14** architectures.
15*/
16#define _SQLITE_OS_C_ 1
17#include "sqliteInt.h"
18#include "os.h"
19#undef _SQLITE_OS_C_
20
21/*
22** The following routines are convenience wrappers around methods
23** of the OsFile object. This is mostly just syntactic sugar. All
24** of this would be completely automatic if SQLite were coded using
25** C++ instead of plain old C.
26*/
27int sqlite3OsClose(OsFile **pId){
28 OsFile *id;
29 if( pId!=0 && (id = *pId)!=0 ){
30 return id->pMethod->xClose(pId);
31 }else{
32 return SQLITE_OK;
33 }
34}
35int sqlite3OsOpenDirectory(OsFile *id, const char *zName){
36 return id->pMethod->xOpenDirectory(id, zName);
37}
38int sqlite3OsRead(OsFile *id, void *pBuf, int amt){
39 return id->pMethod->xRead(id, pBuf, amt);
40}
41int sqlite3OsWrite(OsFile *id, const void *pBuf, int amt){
42 return id->pMethod->xWrite(id, pBuf, amt);
43}
44int sqlite3OsSeek(OsFile *id, i64 offset){
45 return id->pMethod->xSeek(id, offset);
46}
47int sqlite3OsTruncate(OsFile *id, i64 size){
48 return id->pMethod->xTruncate(id, size);
49}
50int sqlite3OsSync(OsFile *id, int fullsync){
51 return id->pMethod->xSync(id, fullsync);
52}
53void sqlite3OsSetFullSync(OsFile *id, int value){
54 id->pMethod->xSetFullSync(id, value);
55}
56int sqlite3OsFileSize(OsFile *id, i64 *pSize){
57 return id->pMethod->xFileSize(id, pSize);
58}
59int sqlite3OsLock(OsFile *id, int lockType){
60 return id->pMethod->xLock(id, lockType);
61}
62int sqlite3OsUnlock(OsFile *id, int lockType){
63 return id->pMethod->xUnlock(id, lockType);
64}
65int sqlite3OsCheckReservedLock(OsFile *id){
66 return id->pMethod->xCheckReservedLock(id);
67}
68int sqlite3OsSectorSize(OsFile *id){
69 int (*xSectorSize)(OsFile*) = id->pMethod->xSectorSize;
70 return xSectorSize ? xSectorSize(id) : SQLITE_DEFAULT_SECTOR_SIZE;
71}
72
73#if defined(SQLITE_TEST) || defined(SQLITE_DEBUG)
74 /* These methods are currently only used for testing and debugging. */
75 int sqlite3OsFileHandle(OsFile *id){
76 return id->pMethod->xFileHandle(id);
77 }
78 int sqlite3OsLockState(OsFile *id){
79 return id->pMethod->xLockState(id);
80 }
81#endif
82
83#ifdef SQLITE_ENABLE_REDEF_IO
84/*
85** A function to return a pointer to the virtual function table.
86** This routine really does not accomplish very much since the
87** virtual function table is a global variable and anybody who
88** can call this function can just as easily access the variable
89** for themselves. Nevertheless, we include this routine for
90** backwards compatibility with an earlier redefinable I/O
91** interface design.
92*/
93struct sqlite3OsVtbl *sqlite3_os_switch(void){
94 return &sqlite3Os;
95}
96#endif

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