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Towards VFS API.

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Nuno Cruces
2023-05-17 01:00:08 +01:00
parent c86b06b048
commit 2a010a2022
12 changed files with 77 additions and 42 deletions
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7
sqlite3/main.c
View File

@@ -16,13 +16,6 @@
#include "ext/uuid.c"
#include "time.c"
sqlite3_destructor_type malloc_destructor = &free;
size_t sqlite3_interrupt_offset = offsetof(sqlite3, u1.isInterrupted);
int sqlite3_os_init() {
return sqlite3_vfs_register(os_vfs(), /*default=*/true);
}
__attribute__((constructor)) void init() {
sqlite3_initialize();
sqlite3_auto_extension((void (*)(void))sqlite3_base_init);

11
sqlite3/sqlite_cfg.h
View File

@@ -59,9 +59,12 @@
#define SECOND(...) SECOND_I(__VA_ARGS__, , )
#define SECOND_I(A, B, ...) B
#define GLUE(A, B) GLUE_I(A, B)
#define GLUE_I(A, B) A##B
#define REPLACE_DEFAULT(a, prefix) SECOND(GLUE(prefix, __LINE__), a)
#define REPLACE_AT_LINE(a) , a
#define GLUE_I(A, B) A##_##B
#define CREATE_REPLACER(A) SECOND(GLUE(A, __LINE__), A)
#define REPLACE_AT_LINE(A) , A
// Implemented in vfs.c.
int localtime_s(struct tm *const pTm, time_t const *const pTime);
int localtime_s(struct tm *const pTm, time_t const *const pTime);
#define sqlite3_vfs_find CREATE_REPLACER(sqlite3_vfs_find_wrapper)
#define sqlite3_vfs_find_wrapper_25397 REPLACE_AT_LINE(sqlite3_vfs_find)

59
sqlite3/vfs.c
View File

@@ -3,6 +3,7 @@
#include "sqlite3.h"
int go_localtime(struct tm *, sqlite3_int64);
int go_vfs_find(const char *zVfsName);
int go_randomness(sqlite3_vfs *, int nByte, char *zOut);
int go_sleep(sqlite3_vfs *, int microseconds);
@@ -60,9 +61,7 @@ struct go_file {
int handle;
};
static_assert(offsetof(struct go_file, handle) == 4, "Unexpected offset");
sqlite3_vfs *os_vfs() {
int sqlite3_os_init() {
static sqlite3_vfs os_vfs = {
.iVersion = 2,
.szOsFile = sizeof(struct go_file),
@@ -79,9 +78,61 @@ sqlite3_vfs *os_vfs() {
.xCurrentTime = go_current_time,
.xCurrentTimeInt64 = go_current_time_64,
};
return &os_vfs;
return sqlite3_vfs_register(&os_vfs, /*default=*/true);
}
sqlite3_destructor_type malloc_destructor = &free;
int localtime_s(struct tm *const pTm, time_t const *const pTime) {
return go_localtime(pTm, (sqlite3_int64)*pTime);
}
#undef sqlite3_vfs_find
sqlite3_vfs *sqlite3_vfs_find_wrapper(const char *zVfsName) {
if (zVfsName) {
static sqlite3_vfs *go_vfs_list;
sqlite3_vfs *found = NULL;
for (sqlite3_vfs **next = &go_vfs_list; *next;) {
sqlite3_vfs *it = *next;
if (go_vfs_find(it->zName)) {
if (!strcmp(zVfsName, it->zName)) found = it;
next = &it->pNext;
} else {
*next = it->pNext;
free(it);
}
}
if (found) {
return found;
}
if (go_vfs_find(zVfsName)) {
sqlite3_vfs *prev = go_vfs_list;
go_vfs_list = malloc(sizeof(sqlite3_vfs) + strlen(zVfsName) + 1);
char *name = (char *)(go_vfs_list + 1);
strcpy(name, zVfsName);
*go_vfs_list = (sqlite3_vfs){
.iVersion = 2,
.szOsFile = sizeof(struct go_file),
.mxPathname = 512,
.zName = name,
.pNext = prev,
.xOpen = go_open_wrapper,
.xDelete = go_delete,
.xAccess = go_access,
.xFullPathname = go_full_pathname,
.xRandomness = go_randomness,
.xSleep = go_sleep,
.xCurrentTime = go_current_time,
.xCurrentTimeInt64 = go_current_time_64,
};
return go_vfs_list;
}
}
return sqlite3_vfs_find(zVfsName);
}
static_assert(offsetof(struct go_file, handle) == 4, "Unexpected offset");
static_assert(offsetof(sqlite3_vfs, zName) == 16, "Unexpected offset");
static_assert(offsetof(sqlite3, u1.isInterrupted) == 280, "Unexpected offset");