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/*
* tclClockFmt.c --
*
* Contains the date format (and scan) routines. This code is back-ported
* from the time and date facilities of tclSE engine, by Serg G. Brester.
*
* Copyright (c) 2015 by Sergey G. Brester aka sebres. All rights reserved.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tclInt.h"
#include "tclDate.h"
/*
* Miscellaneous forward declarations and functions used within this file
*/
static void
ClockFmtObj_DupInternalRep(Tcl_Obj *srcPtr, Tcl_Obj *copyPtr);
static void
ClockFmtObj_FreeInternalRep(Tcl_Obj *objPtr);
static int
ClockFmtObj_SetFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
static void
ClockFmtObj_UpdateString(Tcl_Obj *objPtr);
TCL_DECLARE_MUTEX(ClockFmtMutex); /* Serializes access to common format list. */
static void ClockFmtScnStorageDelete(ClockFmtScnStorage *fss);
/*
* Clock scan and format facilities.
*/
#define TOK_CHAIN_BLOCK_SIZE 8
/*
*----------------------------------------------------------------------
*/
#if CLOCK_FMT_SCN_STORAGE_GC_SIZE > 0
static struct {
ClockFmtScnStorage *stackPtr;
ClockFmtScnStorage *stackBound;
unsigned int count;
} ClockFmtScnStorage_GC = {NULL, NULL, 0};
inline void
ClockFmtScnStorageGC_In(ClockFmtScnStorage *entry)
{
/* add new entry */
TclSpliceIn(entry, ClockFmtScnStorage_GC.stackPtr);
if (ClockFmtScnStorage_GC.stackBound == NULL) {
ClockFmtScnStorage_GC.stackBound = entry;
}
ClockFmtScnStorage_GC.count++;
/* if GC ist full */
if (ClockFmtScnStorage_GC.count > CLOCK_FMT_SCN_STORAGE_GC_SIZE) {
/* GC stack is LIFO: delete first inserted entry */
ClockFmtScnStorage *delEnt = ClockFmtScnStorage_GC.stackBound;
ClockFmtScnStorage_GC.stackBound = delEnt->prevPtr;
TclSpliceOut(delEnt, ClockFmtScnStorage_GC.stackPtr);
ClockFmtScnStorage_GC.count--;
delEnt->prevPtr = delEnt->nextPtr = NULL;
/* remove it now */
ClockFmtScnStorageDelete(delEnt);
}
}
inline void
ClockFmtScnStorage_GC_Out(ClockFmtScnStorage *entry)
{
TclSpliceOut(entry, ClockFmtScnStorage_GC.stackPtr);
ClockFmtScnStorage_GC.count--;
if (ClockFmtScnStorage_GC.stackBound == entry) {
ClockFmtScnStorage_GC.stackBound = entry->prevPtr;
}
entry->prevPtr = entry->nextPtr = NULL;
}
#endif
/*
*----------------------------------------------------------------------
*/
static Tcl_HashTable FmtScnHashTable;
static int initFmtScnHashTable = 0;
inline Tcl_HashEntry *
HashEntry4FmtScn(ClockFmtScnStorage *fss) {
return (Tcl_HashEntry*)(fss + 1);
};
inline ClockFmtScnStorage *
FmtScn4HashEntry(Tcl_HashEntry *hKeyPtr) {
return (ClockFmtScnStorage*)(((char*)hKeyPtr) - sizeof(ClockFmtScnStorage));
};
/*
* Format storage hash (list of formats shared across all threads).
*/
static Tcl_HashEntry *
ClockFmtScnStorageAllocProc(
Tcl_HashTable *tablePtr, /* Hash table. */
void *keyPtr) /* Key to store in the hash table entry. */
{
ClockFmtScnStorage *fss;
const char *string = (const char *) keyPtr;
Tcl_HashEntry *hPtr;
unsigned int size,
allocsize = sizeof(ClockFmtScnStorage) + sizeof(Tcl_HashEntry);
allocsize += (size = strlen(string) + 1);
if (size > sizeof(hPtr->key)) {
allocsize -= sizeof(hPtr->key);
}
fss = ckalloc(allocsize);
/* initialize */
memset(fss, 0, sizeof(*fss));
hPtr = HashEntry4FmtScn(fss);
memcpy(&hPtr->key.string, string, size);
hPtr->clientData = 0; /* currently unused */
return hPtr;
}
static void
ClockFmtScnStorageFreeProc(
Tcl_HashEntry *hPtr)
{
ClockFmtScnStorage *fss = FmtScn4HashEntry(hPtr);
ClockScanToken *tok;
tok = fss->firstScnTok;
while (tok != NULL) {
if (tok->nextTok == tok + 1) {
tok++;
/*****************************/
} else {
tok = tok->nextTok;
}
}
ckfree(fss);
}
static void
ClockFmtScnStorageDelete(ClockFmtScnStorage *fss) {
Tcl_HashEntry *hPtr = HashEntry4FmtScn(fss);
/*
* This will delete a hash entry and call "ckfree" for storage self, if
* some additionally handling required, freeEntryProc can be used instead
*/
Tcl_DeleteHashEntry(hPtr);
}
/*
* Derivation of tclStringHashKeyType with another allocEntryProc
*/
static Tcl_HashKeyType ClockFmtScnStorageHashKeyType;
/*
*----------------------------------------------------------------------
*/
static ClockFmtScnStorage *
FindOrCreateFmtScnStorage(
Tcl_Interp *interp,
const char *strFmt)
{
ClockFmtScnStorage *fss = NULL;
int new;
Tcl_HashEntry *hPtr;
Tcl_MutexLock(&ClockFmtMutex);
/* if not yet initialized */
if (!initFmtScnHashTable) {
/* initialize type */
memcpy(&ClockFmtScnStorageHashKeyType, &tclStringHashKeyType, sizeof(tclStringHashKeyType));
ClockFmtScnStorageHashKeyType.allocEntryProc = ClockFmtScnStorageAllocProc;
ClockFmtScnStorageHashKeyType.freeEntryProc = ClockFmtScnStorageFreeProc;
initFmtScnHashTable = 1;
/* initialize hash table */
Tcl_InitCustomHashTable(&FmtScnHashTable, TCL_CUSTOM_TYPE_KEYS,
&ClockFmtScnStorageHashKeyType);
}
/* get or create entry (and alocate storage) */
hPtr = Tcl_CreateHashEntry(&FmtScnHashTable, strFmt, &new);
if (hPtr != NULL) {
fss = FmtScn4HashEntry(hPtr);
#if CLOCK_FMT_SCN_STORAGE_GC_SIZE > 0
/* unlink if it is currently in GC */
if (new == 0 && fss->objRefCount == 0) {
ClockFmtScnStorage_GC_Out(fss);
}
#endif
/* new reference, so increment in lock right now */
fss->objRefCount++;
}
Tcl_MutexUnlock(&ClockFmtMutex);
if (fss == NULL && interp != NULL) {
Tcl_AppendResult(interp, "retrieve clock format failed \"",
strFmt ? strFmt : "", "\"", NULL);
Tcl_SetErrorCode(interp, "TCL", "EINVAL", NULL);
}
return fss;
}
/*
* Type definition.
*/
Tcl_ObjType ClockFmtObjType = {
"clock-format", /* name */
ClockFmtObj_FreeInternalRep, /* freeIntRepProc */
ClockFmtObj_DupInternalRep, /* dupIntRepProc */
ClockFmtObj_UpdateString, /* updateStringProc */
ClockFmtObj_SetFromAny /* setFromAnyProc */
};
#define SetObjClockFmtScn(objPtr, fss) \
objPtr->internalRep.twoPtrValue.ptr1 = fss
#define ObjClockFmtScn(objPtr) \
(ClockFmtScnStorage *)objPtr->internalRep.twoPtrValue.ptr1;
#define SetObjLitStorage(objPtr, lit) \
objPtr->internalRep.twoPtrValue.ptr2 = lit
#define ObjLitStorage(objPtr) \
(ClockLitStorage *)objPtr->internalRep.twoPtrValue.ptr2;
#define ClockFmtObj_SetObjIntRep(objPtr, fss, lit) \
objPtr->internalRep.twoPtrValue.ptr1 = fss, \
objPtr->internalRep.twoPtrValue.ptr2 = lit, \
objPtr->typePtr = &ClockFmtObjType;
/*
*----------------------------------------------------------------------
*/
static void
ClockFmtObj_DupInternalRep(srcPtr, copyPtr)
Tcl_Obj *srcPtr;
Tcl_Obj *copyPtr;
{
ClockFmtScnStorage *fss = ObjClockFmtScn(srcPtr);
// ClockLitStorage *lit = ObjLitStorage(srcPtr);
if (fss != NULL) {
Tcl_MutexLock(&ClockFmtMutex);
fss->objRefCount++;
Tcl_MutexUnlock(&ClockFmtMutex);
}
ClockFmtObj_SetObjIntRep(copyPtr, fss, NULL);
/* if no format representation, dup string representation */
if (fss == NULL) {
copyPtr->bytes = ckalloc(srcPtr->length + 1);
memcpy(copyPtr->bytes, srcPtr->bytes, srcPtr->length + 1);
copyPtr->length = srcPtr->length;
}
}
/*
*----------------------------------------------------------------------
*/
static void
ClockFmtObj_FreeInternalRep(objPtr)
Tcl_Obj *objPtr;
{
ClockFmtScnStorage *fss = ObjClockFmtScn(objPtr);
// ClockLitStorage *lit = ObjLitStorage(objPtr);
if (fss != NULL) {
Tcl_MutexLock(&ClockFmtMutex);
/* decrement object reference count of format/scan storage */
if (--fss->objRefCount <= 0) {
#if CLOCK_FMT_SCN_STORAGE_GC_SIZE > 0
/* don't remove it right now (may be reusable), just add to GC */
ClockFmtScnStorageGC_In(fss);
#else
/* remove storage (format representation) */
ClockFmtScnStorageDelete(fss);
#endif
}
Tcl_MutexUnlock(&ClockFmtMutex);
}
SetObjClockFmtScn(objPtr, NULL);
SetObjLitStorage(objPtr, NULL);
objPtr->typePtr = NULL;
};
/*
*----------------------------------------------------------------------
*/
static int
ClockFmtObj_SetFromAny(interp, objPtr)
Tcl_Interp *interp;
Tcl_Obj *objPtr;
{
ClockFmtScnStorage *fss;
const char *strFmt = TclGetString(objPtr);
if (!strFmt || (fss = FindOrCreateFmtScnStorage(interp, strFmt)) == NULL) {
return TCL_ERROR;
}
if (objPtr->typePtr && objPtr->typePtr->freeIntRepProc)
objPtr->typePtr->freeIntRepProc(objPtr);
ClockFmtObj_SetObjIntRep(objPtr, fss, NULL);
return TCL_OK;
};
/*
*----------------------------------------------------------------------
*/
static void
ClockFmtObj_UpdateString(objPtr)
Tcl_Obj *objPtr;
{
char *name = "UNKNOWN";
int len;
ClockFmtScnStorage *fss = ObjClockFmtScn(objPtr);
if (fss != NULL) {
Tcl_HashEntry *hPtr = HashEntry4FmtScn(fss);
name = hPtr->key.string;
}
len = strlen(name);
objPtr->length = len,
objPtr->bytes = ckalloc((size_t)++len);
if (objPtr->bytes)
memcpy(objPtr->bytes, name, len);
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetClockFrmScnFromObj --
*
* Returns a clock format/scan representation of (*objPtr), if possible.
* If something goes wrong, NULL is returned, and if interp is non-NULL,
* an error message is written there.
*
* Results:
* Valid representation of type ClockFmtScnStorage.
*
* Side effects:
* Caches the ClockFmtScnStorage reference as the internal rep of (*objPtr)
* and in global hash table, shared across all threads.
*
*----------------------------------------------------------------------
*/
ClockFmtScnStorage *
Tcl_GetClockFrmScnFromObj(
Tcl_Interp *interp,
Tcl_Obj *objPtr)
{
ClockFmtScnStorage *fss;
if (objPtr->typePtr != &ClockFmtObjType) {
if (ClockFmtObj_SetFromAny(interp, objPtr) != TCL_OK) {
return NULL;
}
}
fss = ObjClockFmtScn(objPtr);
if (fss == NULL) {
const char *strFmt = TclGetString(objPtr);
fss = FindOrCreateFmtScnStorage(interp, strFmt);
}
return fss;
}
static void
Tcl_GetClockFrmScnFinalize()
{
#if CLOCK_FMT_SCN_STORAGE_GC_SIZE > 0
/* clear GC */
ClockFmtScnStorage_GC.stackPtr = NULL;
ClockFmtScnStorage_GC.stackBound = NULL;
ClockFmtScnStorage_GC.count = 0;
#endif
if (initFmtScnHashTable) {
Tcl_DeleteHashTable(&FmtScnHashTable);
}
Tcl_MutexFinalize(&ClockFmtMutex);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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