tclEncoding.c from Gdb at Krugle
Show tclEncoding.c syntax highlighted
/*
* tclEncoding.c --
*
* Contains the implementation of the encoding conversion package.
*
* Copyright (c) 1996-1998 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclEncoding.c,v 1.13 2002/04/18 01:51:20 hobbs Exp $
*/
#include "tclInt.h"
#include "tclPort.h"
typedef size_t (LengthProc)_ANSI_ARGS_((CONST char *src));
/*
* The following data structure represents an encoding, which describes how
* to convert between various character sets and UTF-8.
*/
typedef struct Encoding {
char *name; /* Name of encoding. Malloced because (1)
* hash table entry that owns this encoding
* may be freed prior to this encoding being
* freed, (2) string passed in the
* Tcl_EncodingType structure may not be
* persistent. */
Tcl_EncodingConvertProc *toUtfProc;
/* Procedure to convert from external
* encoding into UTF-8. */
Tcl_EncodingConvertProc *fromUtfProc;
/* Procedure to convert from UTF-8 into
* external encoding. */
Tcl_EncodingFreeProc *freeProc;
/* If non-NULL, procedure to call when this
* encoding is deleted. */
int nullSize; /* Number of 0x00 bytes that signify
* end-of-string in this encoding. This
* number is used to determine the source
* string length when the srcLen argument is
* negative. This number can be 1 or 2. */
ClientData clientData; /* Arbitrary value associated with encoding
* type. Passed to conversion procedures. */
LengthProc *lengthProc; /* Function to compute length of
* null-terminated strings in this encoding.
* If nullSize is 1, this is strlen; if
* nullSize is 2, this is a function that
* returns the number of bytes in a 0x0000
* terminated string. */
int refCount; /* Number of uses of this structure. */
Tcl_HashEntry *hPtr; /* Hash table entry that owns this encoding. */
} Encoding;
/*
* The following structure is the clientData for a dynamically-loaded,
* table-driven encoding created by LoadTableEncoding(). It maps between
* Unicode and a single-byte, double-byte, or multibyte (1 or 2 bytes only)
* encoding.
*/
typedef struct TableEncodingData {
int fallback; /* Character (in this encoding) to
* substitute when this encoding cannot
* represent a UTF-8 character. */
char prefixBytes[256]; /* If a byte in the input stream is a lead
* byte for a 2-byte sequence, the
* corresponding entry in this array is 1,
* otherwise it is 0. */
unsigned short **toUnicode; /* Two dimensional sparse matrix to map
* characters from the encoding to Unicode.
* Each element of the toUnicode array points
* to an array of 256 shorts. If there is no
* corresponding character in Unicode, the
* value in the matrix is 0x0000. malloc'd. */
unsigned short **fromUnicode;
/* Two dimensional sparse matrix to map
* characters from Unicode to the encoding.
* Each element of the fromUnicode array
* points to an array of 256 shorts. If there
* is no corresponding character the encoding,
* the value in the matrix is 0x0000.
* malloc'd. */
} TableEncodingData;
/*
* The following structures is the clientData for a dynamically-loaded,
* escape-driven encoding that is itself comprised of other simpler
* encodings. An example is "iso-2022-jp", which uses escape sequences to
* switch between ascii, jis0208, jis0212, gb2312, and ksc5601. Note that
* "escape-driven" does not necessarily mean that the ESCAPE character is
* the character used for switching character sets.
*/
typedef struct EscapeSubTable {
unsigned int sequenceLen; /* Length of following string. */
char sequence[16]; /* Escape code that marks this encoding. */
char name[32]; /* Name for encoding. */
Encoding *encodingPtr; /* Encoding loaded using above name, or NULL
* if this sub-encoding has not been needed
* yet. */
} EscapeSubTable;
typedef struct EscapeEncodingData {
int fallback; /* Character (in this encoding) to
* substitute when this encoding cannot
* represent a UTF-8 character. */
unsigned int initLen; /* Length of following string. */
char init[16]; /* String to emit or expect before first char
* in conversion. */
unsigned int finalLen; /* Length of following string. */
char final[16]; /* String to emit or expect after last char
* in conversion. */
char prefixBytes[256]; /* If a byte in the input stream is the
* first character of one of the escape
* sequences in the following array, the
* corresponding entry in this array is 1,
* otherwise it is 0. */
int numSubTables; /* Length of following array. */
EscapeSubTable subTables[1];/* Information about each EscapeSubTable
* used by this encoding type. The actual
* size will be as large as necessary to
* hold all EscapeSubTables. */
} EscapeEncodingData;
/*
* Constants used when loading an encoding file to identify the type of the
* file.
*/
#define ENCODING_SINGLEBYTE 0
#define ENCODING_DOUBLEBYTE 1
#define ENCODING_MULTIBYTE 2
#define ENCODING_ESCAPE 3
/*
* Initialize the default encoding directory. If this variable contains
* a non NULL value, it will be the first path used to locate the
* system encoding files.
*/
char *tclDefaultEncodingDir = NULL;
static int encodingsInitialized = 0;
/*
* Hash table that keeps track of all loaded Encodings. Keys are
* the string names that represent the encoding, values are (Encoding *).
*/
static Tcl_HashTable encodingTable;
TCL_DECLARE_MUTEX(encodingMutex)
/*
* The following are used to hold the default and current system encodings.
* If NULL is passed to one of the conversion routines, the current setting
* of the system encoding will be used to perform the conversion.
*/
static Tcl_Encoding defaultEncoding;
static Tcl_Encoding systemEncoding;
/*
* The following variable is used in the sparse matrix code for a
* TableEncoding to represent a page in the table that has no entries.
*/
static unsigned short emptyPage[256];
/*
* Procedures used only in this module.
*/
static int BinaryProc _ANSI_ARGS_((ClientData clientData,
CONST char *src, int srcLen, int flags,
Tcl_EncodingState *statePtr, char *dst, int dstLen,
int *srcReadPtr, int *dstWrotePtr,
int *dstCharsPtr));
static void EscapeFreeProc _ANSI_ARGS_((ClientData clientData));
static int EscapeFromUtfProc _ANSI_ARGS_((ClientData clientData,
CONST char *src, int srcLen, int flags,
Tcl_EncodingState *statePtr, char *dst, int dstLen,
int *srcReadPtr, int *dstWrotePtr,
int *dstCharsPtr));
static int EscapeToUtfProc _ANSI_ARGS_((ClientData clientData,
CONST char *src, int srcLen, int flags,
Tcl_EncodingState *statePtr, char *dst, int dstLen,
int *srcReadPtr, int *dstWrotePtr,
int *dstCharsPtr));
static void FreeEncoding _ANSI_ARGS_((Tcl_Encoding encoding));
static Encoding * GetTableEncoding _ANSI_ARGS_((
EscapeEncodingData *dataPtr, int state));
static Tcl_Encoding LoadEncodingFile _ANSI_ARGS_((Tcl_Interp *interp,
CONST char *name));
static Tcl_Encoding LoadTableEncoding _ANSI_ARGS_((Tcl_Interp *interp,
CONST char *name, int type, Tcl_Channel chan));
static Tcl_Encoding LoadEscapeEncoding _ANSI_ARGS_((CONST char *name,
Tcl_Channel chan));
static Tcl_Channel OpenEncodingFile _ANSI_ARGS_((CONST char *dir,
CONST char *name));
static void TableFreeProc _ANSI_ARGS_((ClientData clientData));
static int TableFromUtfProc _ANSI_ARGS_((ClientData clientData,
CONST char *src, int srcLen, int flags,
Tcl_EncodingState *statePtr, char *dst, int dstLen,
int *srcReadPtr, int *dstWrotePtr,
int *dstCharsPtr));
static int TableToUtfProc _ANSI_ARGS_((ClientData clientData,
CONST char *src, int srcLen, int flags,
Tcl_EncodingState *statePtr, char *dst, int dstLen,
int *srcReadPtr, int *dstWrotePtr,
int *dstCharsPtr));
static size_t unilen _ANSI_ARGS_((CONST char *src));
static int UnicodeToUtfProc _ANSI_ARGS_((ClientData clientData,
CONST char *src, int srcLen, int flags,
Tcl_EncodingState *statePtr, char *dst, int dstLen,
int *srcReadPtr, int *dstWrotePtr,
int *dstCharsPtr));
static int UtfToUnicodeProc _ANSI_ARGS_((ClientData clientData,
CONST char *src, int srcLen, int flags,
Tcl_EncodingState *statePtr, char *dst, int dstLen,
int *srcReadPtr, int *dstWrotePtr,
int *dstCharsPtr));
static int UtfToUtfProc _ANSI_ARGS_((ClientData clientData,
CONST char *src, int srcLen, int flags,
Tcl_EncodingState *statePtr, char *dst, int dstLen,
int *srcReadPtr, int *dstWrotePtr,
int *dstCharsPtr));
/*
*---------------------------------------------------------------------------
*
* TclInitEncodingSubsystem --
*
* Initialize all resources used by this subsystem on a per-process
* basis.
*
* Results:
* None.
*
* Side effects:
* Depends on the memory, object, and IO subsystems.
*
*---------------------------------------------------------------------------
*/
void
TclInitEncodingSubsystem()
{
Tcl_EncodingType type;
Tcl_MutexLock(&encodingMutex);
Tcl_InitHashTable(&encodingTable, TCL_STRING_KEYS);
Tcl_MutexUnlock(&encodingMutex);
/*
* Create a few initial encodings. Note that the UTF-8 to UTF-8
* translation is not a no-op, because it will turn a stream of
* improperly formed UTF-8 into a properly formed stream.
*/
type.encodingName = "identity";
type.toUtfProc = BinaryProc;
type.fromUtfProc = BinaryProc;
type.freeProc = NULL;
type.nullSize = 1;
type.clientData = NULL;
defaultEncoding = Tcl_CreateEncoding(&type);
systemEncoding = Tcl_GetEncoding(NULL, type.encodingName);
type.encodingName = "utf-8";
type.toUtfProc = UtfToUtfProc;
type.fromUtfProc = UtfToUtfProc;
type.freeProc = NULL;
type.nullSize = 1;
type.clientData = NULL;
Tcl_CreateEncoding(&type);
type.encodingName = "unicode";
type.toUtfProc = UnicodeToUtfProc;
type.fromUtfProc = UtfToUnicodeProc;
type.freeProc = NULL;
type.nullSize = 2;
type.clientData = NULL;
Tcl_CreateEncoding(&type);
}
/*
*----------------------------------------------------------------------
*
* TclFinalizeEncodingSubsystem --
*
* Release the state associated with the encoding subsystem.
*
* Results:
* None.
*
* Side effects:
* Frees all of the encodings.
*
*----------------------------------------------------------------------
*/
void
TclFinalizeEncodingSubsystem()
{
Tcl_HashSearch search;
Tcl_HashEntry *hPtr;
Tcl_MutexLock(&encodingMutex);
encodingsInitialized = 0;
hPtr = Tcl_FirstHashEntry(&encodingTable, &search);
while (hPtr != NULL) {
/*
* Call FreeEncoding instead of doing it directly to handle refcounts
* like escape encodings use. [Bug #524674]
*/
FreeEncoding((Tcl_Encoding) Tcl_GetHashValue(hPtr));
hPtr = Tcl_NextHashEntry(&search);
}
Tcl_DeleteHashTable(&encodingTable);
Tcl_MutexUnlock(&encodingMutex);
}
/*
*-------------------------------------------------------------------------
*
* Tcl_GetDefaultEncodingDir --
*
*
* Results:
*
* Side effects:
*
*-------------------------------------------------------------------------
*/
CONST char *
Tcl_GetDefaultEncodingDir()
{
return tclDefaultEncodingDir;
}
/*
*-------------------------------------------------------------------------
*
* Tcl_SetDefaultEncodingDir --
*
*
* Results:
*
* Side effects:
*
*-------------------------------------------------------------------------
*/
void
Tcl_SetDefaultEncodingDir(path)
CONST char *path;
{
tclDefaultEncodingDir = (char *)ckalloc((unsigned) strlen(path) + 1);
strcpy(tclDefaultEncodingDir, path);
}
/*
*-------------------------------------------------------------------------
*
* Tcl_GetEncoding --
*
* Given the name of a encoding, find the corresponding Tcl_Encoding
* token. If the encoding did not already exist, Tcl attempts to
* dynamically load an encoding by that name.
*
* Results:
* Returns a token that represents the encoding. If the name didn't
* refer to any known or loadable encoding, NULL is returned. If
* NULL was returned, an error message is left in interp's result
* object, unless interp was NULL.
*
* Side effects:
* The new encoding type is entered into a table visible to all
* interpreters, keyed off the encoding's name. For each call to
* this procedure, there should eventually be a call to
* Tcl_FreeEncoding, so that the database can be cleaned up when
* encodings aren't needed anymore.
*
*-------------------------------------------------------------------------
*/
Tcl_Encoding
Tcl_GetEncoding(interp, name)
Tcl_Interp *interp; /* Interp for error reporting, if not NULL. */
CONST char *name; /* The name of the desired encoding. */
{
Tcl_HashEntry *hPtr;
Encoding *encodingPtr;
Tcl_MutexLock(&encodingMutex);
if (name == NULL) {
encodingPtr = (Encoding *) systemEncoding;
encodingPtr->refCount++;
Tcl_MutexUnlock(&encodingMutex);
return systemEncoding;
}
hPtr = Tcl_FindHashEntry(&encodingTable, name);
if (hPtr != NULL) {
encodingPtr = (Encoding *) Tcl_GetHashValue(hPtr);
encodingPtr->refCount++;
Tcl_MutexUnlock(&encodingMutex);
return (Tcl_Encoding) encodingPtr;
}
Tcl_MutexUnlock(&encodingMutex);
return LoadEncodingFile(interp, name);
}
/*
*---------------------------------------------------------------------------
*
* Tcl_FreeEncoding --
*
* This procedure is called to release an encoding allocated by
* Tcl_CreateEncoding() or Tcl_GetEncoding().
*
* Results:
* None.
*
* Side effects:
* The reference count associated with the encoding is decremented
* and the encoding may be deleted if nothing is using it anymore.
*
*---------------------------------------------------------------------------
*/
void
Tcl_FreeEncoding(encoding)
Tcl_Encoding encoding;
{
Tcl_MutexLock(&encodingMutex);
FreeEncoding(encoding);
Tcl_MutexUnlock(&encodingMutex);
}
/*
*----------------------------------------------------------------------
*
* FreeEncoding --
*
* This procedure is called to release an encoding by procedures
* that already have the encodingMutex.
*
* Results:
* None.
*
* Side effects:
* The reference count associated with the encoding is decremented
* and the encoding may be deleted if nothing is using it anymore.
*
*----------------------------------------------------------------------
*/
static void
FreeEncoding(encoding)
Tcl_Encoding encoding;
{
Encoding *encodingPtr;
encodingPtr = (Encoding *) encoding;
if (encodingPtr == NULL) {
return;
}
encodingPtr->refCount--;
if (encodingPtr->refCount == 0) {
if (encodingPtr->freeProc != NULL) {
(*encodingPtr->freeProc)(encodingPtr->clientData);
}
if (encodingPtr->hPtr != NULL) {
Tcl_DeleteHashEntry(encodingPtr->hPtr);
}
ckfree((char *) encodingPtr->name);
ckfree((char *) encodingPtr);
}
}
/*
*-------------------------------------------------------------------------
*
* Tcl_GetEncodingName --
*
* Given an encoding, return the name that was used to constuct
* the encoding.
*
* Results:
* The name of the encoding.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
CONST char *
Tcl_GetEncodingName(encoding)
Tcl_Encoding encoding; /* The encoding whose name to fetch. */
{
Encoding *encodingPtr;
if (encoding == NULL) {
encoding = systemEncoding;
}
encodingPtr = (Encoding *) encoding;
return encodingPtr->name;
}
/*
*-------------------------------------------------------------------------
*
* Tcl_GetEncodingNames --
*
* Get the list of all known encodings, including the ones stored
* as files on disk in the encoding path.
*
* Results:
* Modifies interp's result object to hold a list of all the available
* encodings.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
void
Tcl_GetEncodingNames(interp)
Tcl_Interp *interp; /* Interp to hold result. */
{
Tcl_HashSearch search;
Tcl_HashEntry *hPtr;
Tcl_Obj *pathPtr, *resultPtr;
int dummy;
Tcl_HashTable table;
Tcl_MutexLock(&encodingMutex);
Tcl_InitHashTable(&table, TCL_STRING_KEYS);
hPtr = Tcl_FirstHashEntry(&encodingTable, &search);
while (hPtr != NULL) {
Encoding *encodingPtr;
encodingPtr = (Encoding *) Tcl_GetHashValue(hPtr);
Tcl_CreateHashEntry(&table, encodingPtr->name, &dummy);
hPtr = Tcl_NextHashEntry(&search);
}
Tcl_MutexUnlock(&encodingMutex);
pathPtr = TclGetLibraryPath();
if (pathPtr != NULL) {
int i, objc;
Tcl_Obj **objv;
char globArgString[10];
Tcl_Obj* encodingObj = Tcl_NewStringObj("encoding",-1);
Tcl_IncrRefCount(encodingObj);
objc = 0;
Tcl_ListObjGetElements(NULL, pathPtr, &objc, &objv);
for (i = 0; i < objc; i++) {
Tcl_Obj *searchIn;
/*
* Construct the path from the element of pathPtr,
* joined with 'encoding'.
*/
searchIn = Tcl_FSJoinToPath(objv[i],1,&encodingObj);
Tcl_IncrRefCount(searchIn);
Tcl_ResetResult(interp);
/*
* TclGlob() changes the contents of globArgString, which causes
* a segfault if we pass in a pointer to non-writeable memory.
* TclGlob() puts its results directly into interp.
*/
strcpy(globArgString, "*.enc");
/*
* The GLOBMODE_TAILS flag returns just the tail of each file
* which is the encoding name with a .enc extension
*/
if ((TclGlob(interp, globArgString, searchIn,
TCL_GLOBMODE_TAILS, NULL) == TCL_OK)) {
int objc2 = 0;
Tcl_Obj **objv2;
int j;
Tcl_ListObjGetElements(NULL, Tcl_GetObjResult(interp), &objc2,
&objv2);
for (j = 0; j < objc2; j++) {
int length;
char *string;
string = Tcl_GetStringFromObj(objv2[j], &length);
length -= 4;
if (length > 0) {
string[length] = '\0';
Tcl_CreateHashEntry(&table, string, &dummy);
string[length] = '.';
}
}
}
Tcl_DecrRefCount(searchIn);
}
Tcl_DecrRefCount(encodingObj);
}
/*
* Clear any values placed in the result by globbing.
*/
Tcl_ResetResult(interp);
resultPtr = Tcl_GetObjResult(interp);
hPtr = Tcl_FirstHashEntry(&table, &search);
while (hPtr != NULL) {
Tcl_Obj *strPtr;
strPtr = Tcl_NewStringObj(Tcl_GetHashKey(&table, hPtr), -1);
Tcl_ListObjAppendElement(NULL, resultPtr, strPtr);
hPtr = Tcl_NextHashEntry(&search);
}
Tcl_DeleteHashTable(&table);
}
/*
*------------------------------------------------------------------------
*
* Tcl_SetSystemEncoding --
*
* Sets the default encoding that should be used whenever the user
* passes a NULL value in to one of the conversion routines.
* If the supplied name is NULL, the system encoding is reset to the
* default system encoding.
*
* Results:
* The return value is TCL_OK if the system encoding was successfully
* set to the encoding specified by name, TCL_ERROR otherwise. If
* TCL_ERROR is returned, an error message is left in interp's result
* object, unless interp was NULL.
*
* Side effects:
* The reference count of the new system encoding is incremented.
* The reference count of the old system encoding is decremented and
* it may be freed.
*
*------------------------------------------------------------------------
*/
int
Tcl_SetSystemEncoding(interp, name)
Tcl_Interp *interp; /* Interp for error reporting, if not NULL. */
CONST char *name; /* The name of the desired encoding, or NULL
* to reset to default encoding. */
{
Tcl_Encoding encoding;
Encoding *encodingPtr;
if (name == NULL) {
Tcl_MutexLock(&encodingMutex);
encoding = defaultEncoding;
encodingPtr = (Encoding *) encoding;
encodingPtr->refCount++;
Tcl_MutexUnlock(&encodingMutex);
} else {
encoding = Tcl_GetEncoding(interp, name);
if (encoding == NULL) {
return TCL_ERROR;
}
}
Tcl_MutexLock(&encodingMutex);
FreeEncoding(systemEncoding);
systemEncoding = encoding;
Tcl_MutexUnlock(&encodingMutex);
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* Tcl_CreateEncoding --
*
* This procedure is called to define a new encoding and the procedures
* that are used to convert between the specified encoding and Unicode.
*
* Results:
* Returns a token that represents the encoding. If an encoding with
* the same name already existed, the old encoding token remains
* valid and continues to behave as it used to, and will eventually
* be garbage collected when the last reference to it goes away. Any
* subsequent calls to Tcl_GetEncoding with the specified name will
* retrieve the most recent encoding token.
*
* Side effects:
* The new encoding type is entered into a table visible to all
* interpreters, keyed off the encoding's name. For each call to
* this procedure, there should eventually be a call to
* Tcl_FreeEncoding, so that the database can be cleaned up when
* encodings aren't needed anymore.
*
*---------------------------------------------------------------------------
*/
Tcl_Encoding
Tcl_CreateEncoding(typePtr)
Tcl_EncodingType *typePtr; /* The encoding type. */
{
Tcl_HashEntry *hPtr;
int new;
Encoding *encodingPtr;
char *name;
Tcl_MutexLock(&encodingMutex);
hPtr = Tcl_CreateHashEntry(&encodingTable, typePtr->encodingName, &new);
if (new == 0) {
/*
* Remove old encoding from hash table, but don't delete it until
* last reference goes away.
*/
encodingPtr = (Encoding *) Tcl_GetHashValue(hPtr);
encodingPtr->hPtr = NULL;
}
name = ckalloc((unsigned) strlen(typePtr->encodingName) + 1);
encodingPtr = (Encoding *) ckalloc(sizeof(Encoding));
encodingPtr->name = strcpy(name, typePtr->encodingName);
encodingPtr->toUtfProc = typePtr->toUtfProc;
encodingPtr->fromUtfProc = typePtr->fromUtfProc;
encodingPtr->freeProc = typePtr->freeProc;
encodingPtr->nullSize = typePtr->nullSize;
encodingPtr->clientData = typePtr->clientData;
if (typePtr->nullSize == 1) {
encodingPtr->lengthProc = (LengthProc *) strlen;
} else {
encodingPtr->lengthProc = (LengthProc *) unilen;
}
encodingPtr->refCount = 1;
encodingPtr->hPtr = hPtr;
Tcl_SetHashValue(hPtr, encodingPtr);
Tcl_MutexUnlock(&encodingMutex);
return (Tcl_Encoding) encodingPtr;
}
/*
*-------------------------------------------------------------------------
*
* Tcl_ExternalToUtfDString --
*
* Convert a source buffer from the specified encoding into UTF-8.
* If any of the bytes in the source buffer are invalid or cannot
* be represented in the target encoding, a default fallback
* character will be substituted.
*
* Results:
* The converted bytes are stored in the DString, which is then NULL
* terminated. The return value is a pointer to the value stored
* in the DString.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
char *
Tcl_ExternalToUtfDString(encoding, src, srcLen, dstPtr)
Tcl_Encoding encoding; /* The encoding for the source string, or
* NULL for the default system encoding. */
CONST char *src; /* Source string in specified encoding. */
int srcLen; /* Source string length in bytes, or < 0 for
* encoding-specific string length. */
Tcl_DString *dstPtr; /* Uninitialized or free DString in which
* the converted string is stored. */
{
char *dst;
Tcl_EncodingState state;
Encoding *encodingPtr;
int flags, dstLen, result, soFar, srcRead, dstWrote, dstChars;
Tcl_DStringInit(dstPtr);
dst = Tcl_DStringValue(dstPtr);
dstLen = dstPtr->spaceAvl - 1;
if (encoding == NULL) {
encoding = systemEncoding;
}
encodingPtr = (Encoding *) encoding;
if (src == NULL) {
srcLen = 0;
} else if (srcLen < 0) {
srcLen = (*encodingPtr->lengthProc)(src);
}
flags = TCL_ENCODING_START | TCL_ENCODING_END;
while (1) {
result = (*encodingPtr->toUtfProc)(encodingPtr->clientData, src,
srcLen, flags, &state, dst, dstLen, &srcRead, &dstWrote,
&dstChars);
soFar = dst + dstWrote - Tcl_DStringValue(dstPtr);
if (result != TCL_CONVERT_NOSPACE) {
Tcl_DStringSetLength(dstPtr, soFar);
return Tcl_DStringValue(dstPtr);
}
flags &= ~TCL_ENCODING_START;
src += srcRead;
srcLen -= srcRead;
if (Tcl_DStringLength(dstPtr) == 0) {
Tcl_DStringSetLength(dstPtr, dstLen);
}
Tcl_DStringSetLength(dstPtr, 2 * Tcl_DStringLength(dstPtr) + 1);
dst = Tcl_DStringValue(dstPtr) + soFar;
dstLen = Tcl_DStringLength(dstPtr) - soFar - 1;
}
}
/*
*-------------------------------------------------------------------------
*
* Tcl_ExternalToUtf --
*
* Convert a source buffer from the specified encoding into UTF-8.
*
* Results:
* The return value is one of TCL_OK, TCL_CONVERT_MULTIBYTE,
* TCL_CONVERT_SYNTAX, TCL_CONVERT_UNKNOWN, or TCL_CONVERT_NOSPACE,
* as documented in tcl.h.
*
* Side effects:
* The converted bytes are stored in the output buffer.
*
*-------------------------------------------------------------------------
*/
int
Tcl_ExternalToUtf(interp, encoding, src, srcLen, flags, statePtr, dst,
dstLen, srcReadPtr, dstWrotePtr, dstCharsPtr)
Tcl_Interp *interp; /* Interp for error return, if not NULL. */
Tcl_Encoding encoding; /* The encoding for the source string, or
* NULL for the default system encoding. */
CONST char *src; /* Source string in specified encoding. */
int srcLen; /* Source string length in bytes, or < 0 for
* encoding-specific string length. */
int flags; /* Conversion control flags. */
Tcl_EncodingState *statePtr;/* Place for conversion routine to store
* state information used during a piecewise
* conversion. Contents of statePtr are
* initialized and/or reset by conversion
* routine under control of flags argument. */
char *dst; /* Output buffer in which converted string
* is stored. */
int dstLen; /* The maximum length of output buffer in
* bytes. */
int *srcReadPtr; /* Filled with the number of bytes from the
* source string that were converted. This
* may be less than the original source length
* if there was a problem converting some
* source characters. */
int *dstWrotePtr; /* Filled with the number of bytes that were
* stored in the output buffer as a result of
* the conversion. */
int *dstCharsPtr; /* Filled with the number of characters that
* correspond to the bytes stored in the
* output buffer. */
{
Encoding *encodingPtr;
int result, srcRead, dstWrote, dstChars;
Tcl_EncodingState state;
if (encoding == NULL) {
encoding = systemEncoding;
}
encodingPtr = (Encoding *) encoding;
if (src == NULL) {
srcLen = 0;
} else if (srcLen < 0) {
srcLen = (*encodingPtr->lengthProc)(src);
}
if (statePtr == NULL) {
flags |= TCL_ENCODING_START | TCL_ENCODING_END;
statePtr = &state;
}
if (srcReadPtr == NULL) {
srcReadPtr = &srcRead;
}
if (dstWrotePtr == NULL) {
dstWrotePtr = &dstWrote;
}
if (dstCharsPtr == NULL) {
dstCharsPtr = &dstChars;
}
/*
* If there are any null characters in the middle of the buffer, they will
* converted to the UTF-8 null character (\xC080). To get the actual
* \0 at the end of the destination buffer, we need to append it manually.
*/
dstLen--;
result = (*encodingPtr->toUtfProc)(encodingPtr->clientData, src, srcLen,
flags, statePtr, dst, dstLen, srcReadPtr, dstWrotePtr,
dstCharsPtr);
dst[*dstWrotePtr] = '\0';
return result;
}
/*
*-------------------------------------------------------------------------
*
* Tcl_UtfToExternalDString --
*
* Convert a source buffer from UTF-8 into the specified encoding.
* If any of the bytes in the source buffer are invalid or cannot
* be represented in the target encoding, a default fallback
* character will be substituted.
*
* Results:
* The converted bytes are stored in the DString, which is then
* NULL terminated in an encoding-specific manner. The return value
* is a pointer to the value stored in the DString.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
char *
Tcl_UtfToExternalDString(encoding, src, srcLen, dstPtr)
Tcl_Encoding encoding; /* The encoding for the converted string,
* or NULL for the default system encoding. */
CONST char *src; /* Source string in UTF-8. */
int srcLen; /* Source string length in bytes, or < 0 for
* strlen(). */
Tcl_DString *dstPtr; /* Uninitialized or free DString in which
* the converted string is stored. */
{
char *dst;
Tcl_EncodingState state;
Encoding *encodingPtr;
int flags, dstLen, result, soFar, srcRead, dstWrote, dstChars;
Tcl_DStringInit(dstPtr);
dst = Tcl_DStringValue(dstPtr);
dstLen = dstPtr->spaceAvl - 1;
if (encoding == NULL) {
encoding = systemEncoding;
}
encodingPtr = (Encoding *) encoding;
if (src == NULL) {
srcLen = 0;
} else if (srcLen < 0) {
srcLen = strlen(src);
}
flags = TCL_ENCODING_START | TCL_ENCODING_END;
while (1) {
result = (*encodingPtr->fromUtfProc)(encodingPtr->clientData, src,
srcLen, flags, &state, dst, dstLen, &srcRead, &dstWrote,
&dstChars);
soFar = dst + dstWrote - Tcl_DStringValue(dstPtr);
if (result != TCL_CONVERT_NOSPACE) {
if (encodingPtr->nullSize == 2) {
Tcl_DStringSetLength(dstPtr, soFar + 1);
}
Tcl_DStringSetLength(dstPtr, soFar);
return Tcl_DStringValue(dstPtr);
}
flags &= ~TCL_ENCODING_START;
src += srcRead;
srcLen -= srcRead;
if (Tcl_DStringLength(dstPtr) == 0) {
Tcl_DStringSetLength(dstPtr, dstLen);
}
Tcl_DStringSetLength(dstPtr, 2 * Tcl_DStringLength(dstPtr) + 1);
dst = Tcl_DStringValue(dstPtr) + soFar;
dstLen = Tcl_DStringLength(dstPtr) - soFar - 1;
}
}
/*
*-------------------------------------------------------------------------
*
* Tcl_UtfToExternal --
*
* Convert a buffer from UTF-8 into the specified encoding.
*
* Results:
* The return value is one of TCL_OK, TCL_CONVERT_MULTIBYTE,
* TCL_CONVERT_SYNTAX, TCL_CONVERT_UNKNOWN, or TCL_CONVERT_NOSPACE,
* as documented in tcl.h.
*
* Side effects:
* The converted bytes are stored in the output buffer.
*
*-------------------------------------------------------------------------
*/
int
Tcl_UtfToExternal(interp, encoding, src, srcLen, flags, statePtr, dst,
dstLen, srcReadPtr, dstWrotePtr, dstCharsPtr)
Tcl_Interp *interp; /* Interp for error return, if not NULL. */
Tcl_Encoding encoding; /* The encoding for the converted string,
* or NULL for the default system encoding. */
CONST char *src; /* Source string in UTF-8. */
int srcLen; /* Source string length in bytes, or < 0 for
* strlen(). */
int flags; /* Conversion control flags. */
Tcl_EncodingState *statePtr;/* Place for conversion routine to store
* state information used during a piecewise
* conversion. Contents of statePtr are
* initialized and/or reset by conversion
* routine under control of flags argument. */
char *dst; /* Output buffer in which converted string
* is stored. */
int dstLen; /* The maximum length of output buffer in
* bytes. */
int *srcReadPtr; /* Filled with the number of bytes from the
* source string that were converted. This
* may be less than the original source length
* if there was a problem converting some
* source characters. */
int *dstWrotePtr; /* Filled with the number of bytes that were
* stored in the output buffer as a result of
* the conversion. */
int *dstCharsPtr; /* Filled with the number of characters that
* correspond to the bytes stored in the
* output buffer. */
{
Encoding *encodingPtr;
int result, srcRead, dstWrote, dstChars;
Tcl_EncodingState state;
if (encoding == NULL) {
encoding = systemEncoding;
}
encodingPtr = (Encoding *) encoding;
if (src == NULL) {
srcLen = 0;
} else if (srcLen < 0) {
srcLen = strlen(src);
}
if (statePtr == NULL) {
flags |= TCL_ENCODING_START | TCL_ENCODING_END;
statePtr = &state;
}
if (srcReadPtr == NULL) {
srcReadPtr = &srcRead;
}
if (dstWrotePtr == NULL) {
dstWrotePtr = &dstWrote;
}
if (dstCharsPtr == NULL) {
dstCharsPtr = &dstChars;
}
dstLen -= encodingPtr->nullSize;
result = (*encodingPtr->fromUtfProc)(encodingPtr->clientData, src, srcLen,
flags, statePtr, dst, dstLen, srcReadPtr, dstWrotePtr,
dstCharsPtr);
if (encodingPtr->nullSize == 2) {
dst[*dstWrotePtr + 1] = '\0';
}
dst[*dstWrotePtr] = '\0';
return result;
}
/*
*---------------------------------------------------------------------------
*
* Tcl_FindExecutable --
*
* This procedure computes the absolute path name of the current
* application, given its argv[0] value.
*
* Results:
* None.
*
* Side effects:
* The variable tclExecutableName gets filled in with the file
* name for the application, if we figured it out. If we couldn't
* figure it out, tclExecutableName is set to NULL.
*
*---------------------------------------------------------------------------
*/
void
Tcl_FindExecutable(argv0)
CONST char *argv0; /* The value of the application's argv[0]
* (native). */
{
CONST char *name;
Tcl_DString buffer, nameString;
TclInitSubsystems(argv0);
if (argv0 == NULL) {
goto done;
}
if (tclExecutableName != NULL) {
ckfree(tclExecutableName);
tclExecutableName = NULL;
}
if ((name = TclpFindExecutable(argv0)) == NULL) {
goto done;
}
/*
* The value returned from TclpNameOfExecutable is a UTF string that
* is possibly dirty depending on when it was initialized. To assure
* that the UTF string is a properly encoded native string for this
* system, convert the UTF string to the default native encoding
* before the default encoding is initialized. Then, convert it back
* to UTF after the system encoding is loaded.
*/
Tcl_UtfToExternalDString(NULL, name, -1, &buffer);
TclFindEncodings(argv0);
/*
* Now it is OK to convert the native string back to UTF and set
* the value of the tclExecutableName.
*/
Tcl_ExternalToUtfDString(NULL, Tcl_DStringValue(&buffer), -1, &nameString);
tclExecutableName = (char *)
ckalloc((unsigned) (Tcl_DStringLength(&nameString) + 1));
strcpy(tclExecutableName, Tcl_DStringValue(&nameString));
Tcl_DStringFree(&buffer);
Tcl_DStringFree(&nameString);
return;
done:
TclFindEncodings(argv0);
}
/*
*---------------------------------------------------------------------------
*
* LoadEncodingFile --
*
* Read a file that describes an encoding and create a new Encoding
* from the data.
*
* Results:
* The return value is the newly loaded Encoding, or NULL if
* the file didn't exist of was in the incorrect format. If NULL was
* returned, an error message is left in interp's result object,
* unless interp was NULL.
*
* Side effects:
* File read from disk.
*
*---------------------------------------------------------------------------
*/
static Tcl_Encoding
LoadEncodingFile(interp, name)
Tcl_Interp *interp; /* Interp for error reporting, if not NULL. */
CONST char *name; /* The name of the encoding file on disk
* and also the name for new encoding. */
{
int objc, i, ch;
Tcl_Obj **objv;
Tcl_Obj *pathPtr;
Tcl_Channel chan;
Tcl_Encoding encoding;
pathPtr = TclGetLibraryPath();
if (pathPtr == NULL) {
goto unknown;
}
objc = 0;
Tcl_ListObjGetElements(NULL, pathPtr, &objc, &objv);
chan = NULL;
for (i = 0; i < objc; i++) {
chan = OpenEncodingFile(Tcl_GetString(objv[i]), name);
if (chan != NULL) {
break;
}
}
if (chan == NULL) {
goto unknown;
}
Tcl_SetChannelOption(NULL, chan, "-encoding", "utf-8");
while (1) {
Tcl_DString ds;
Tcl_DStringInit(&ds);
Tcl_Gets(chan, &ds);
ch = Tcl_DStringValue(&ds)[0];
Tcl_DStringFree(&ds);
if (ch != '#') {
break;
}
}
encoding = NULL;
switch (ch) {
case 'S': {
encoding = LoadTableEncoding(interp, name, ENCODING_SINGLEBYTE,
chan);
break;
}
case 'D': {
encoding = LoadTableEncoding(interp, name, ENCODING_DOUBLEBYTE,
chan);
break;
}
case 'M': {
encoding = LoadTableEncoding(interp, name, ENCODING_MULTIBYTE,
chan);
break;
}
case 'E': {
encoding = LoadEscapeEncoding(name, chan);
break;
}
}
if ((encoding == NULL) && (interp != NULL)) {
Tcl_AppendResult(interp, "invalid encoding file \"", name, "\"", NULL);
}
Tcl_Close(NULL, chan);
return encoding;
unknown:
if (interp != NULL) {
Tcl_AppendResult(interp, "unknown encoding \"", name, "\"", NULL);
}
return NULL;
}
/*
*----------------------------------------------------------------------
*
* OpenEncodingFile --
*
* Look for the file encoding/<name>.enc in the specified
* directory.
*
* Results:
* Returns an open file channel if the file exists.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static Tcl_Channel
OpenEncodingFile(dir, name)
CONST char *dir;
CONST char *name;
{
CONST char *argv[3];
Tcl_DString pathString;
CONST char *path;
Tcl_Channel chan;
Tcl_Obj *pathPtr;
argv[0] = dir;
argv[1] = "encoding";
argv[2] = name;
Tcl_DStringInit(&pathString);
Tcl_JoinPath(3, argv, &pathString);
path = Tcl_DStringAppend(&pathString, ".enc", -1);
pathPtr = Tcl_NewStringObj(path,-1);
Tcl_IncrRefCount(pathPtr);
chan = Tcl_FSOpenFileChannel(NULL, pathPtr, "r", 0);
Tcl_DecrRefCount(pathPtr);
Tcl_DStringFree(&pathString);
return chan;
}
/*
*-------------------------------------------------------------------------
*
* LoadTableEncoding --
*
* Helper function for LoadEncodingTable(). Loads a table to that
* converts between Unicode and some other encoding and creates an
* encoding (using a TableEncoding structure) from that information.
*
* File contains binary data, but begins with a marker to indicate
* byte-ordering, so that same binary file can be read on either
* endian platforms.
*
* Results:
* The return value is the new encoding, or NULL if the encoding
* could not be created (because the file contained invalid data).
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
static Tcl_Encoding
LoadTableEncoding(interp, name, type, chan)
Tcl_Interp *interp; /* Interp for temporary obj while reading. */
CONST char *name; /* Name for new encoding. */
int type; /* Type of encoding (ENCODING_?????). */
Tcl_Channel chan; /* File containing new encoding. */
{
Tcl_DString lineString;
Tcl_Obj *objPtr;
char *line;
int i, hi, lo, numPages, symbol, fallback;
unsigned char used[256];
unsigned int size;
TableEncodingData *dataPtr;
unsigned short *pageMemPtr;
Tcl_EncodingType encType;
/*
* Speed over memory. Use a full 256 character table to decode hex
* sequences in the encoding files.
*/
static char staticHex[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0 ... 15 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 16 ... 31 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 32 ... 47 */
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, /* 48 ... 63 */
0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 64 ... 79 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 80 ... 95 */
0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 96 ... 111 */
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, /* 112 ... 127 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 128 ... 143 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 144 ... 159 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 160 ... 175 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 176 ... 191 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 192 ... 207 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 208 ... 223 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 224 ... 239 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 240 ... 255 */
};
Tcl_DStringInit(&lineString);
Tcl_Gets(chan, &lineString);
line = Tcl_DStringValue(&lineString);
fallback = (int) strtol(line, &line, 16);
symbol = (int) strtol(line, &line, 10);
numPages = (int) strtol(line, &line, 10);
Tcl_DStringFree(&lineString);
if (numPages < 0) {
numPages = 0;
} else if (numPages > 256) {
numPages = 256;
}
memset(used, 0, sizeof(used));
#undef PAGESIZE
#define PAGESIZE (256 * sizeof(unsigned short))
dataPtr = (TableEncodingData *) ckalloc(sizeof(TableEncodingData));
memset(dataPtr, 0, sizeof(TableEncodingData));
dataPtr->fallback = fallback;
/*
* Read the table that maps characters to Unicode. Performs a single
* malloc to get the memory for the array and all the pages needed by
* the array.
*/
size = 256 * sizeof(unsigned short *) + numPages * PAGESIZE;
dataPtr->toUnicode = (unsigned short **) ckalloc(size);
memset(dataPtr->toUnicode, 0, size);
pageMemPtr = (unsigned short *) (dataPtr->toUnicode + 256);
if (interp == NULL) {
objPtr = Tcl_NewObj();
} else {
objPtr = Tcl_GetObjResult(interp);
}
for (i = 0; i < numPages; i++) {
int ch;
char *p;
Tcl_ReadChars(chan, objPtr, 3 + 16 * (16 * 4 + 1), 0);
p = Tcl_GetString(objPtr);
hi = (staticHex[(unsigned int)p[0]] << 4) + staticHex[(unsigned int)p[1]];
dataPtr->toUnicode[hi] = pageMemPtr;
p += 2;
for (lo = 0; lo < 256; lo++) {
if ((lo & 0x0f) == 0) {
p++;
}
ch = (staticHex[(unsigned int)p[0]] << 12) + (staticHex[(unsigned int)p[1]] << 8)
+ (staticHex[(unsigned int)p[2]] << 4) + staticHex[(unsigned int)p[3]];
if (ch != 0) {
used[ch >> 8] = 1;
}
*pageMemPtr = (unsigned short) ch;
pageMemPtr++;
p += 4;
}
}
if (interp == NULL) {
Tcl_DecrRefCount(objPtr);
} else {
Tcl_ResetResult(interp);
}
if (type == ENCODING_DOUBLEBYTE) {
memset(dataPtr->prefixBytes, 1, sizeof(dataPtr->prefixBytes));
} else {
for (hi = 1; hi < 256; hi++) {
if (dataPtr->toUnicode[hi] != NULL) {
dataPtr->prefixBytes[hi] = 1;
}
}
}
/*
* Invert toUnicode array to produce the fromUnicode array. Performs a
* single malloc to get the memory for the array and all the pages
* needed by the array. While reading in the toUnicode array, we
* remembered what pages that would be needed for the fromUnicode array.
*/
if (symbol) {
used[0] = 1;
}
numPages = 0;
for (hi = 0; hi < 256; hi++) {
if (used[hi]) {
numPages++;
}
}
size = 256 * sizeof(unsigned short *) + numPages * PAGESIZE;
dataPtr->fromUnicode = (unsigned short **) ckalloc(size);
memset(dataPtr->fromUnicode, 0, size);
pageMemPtr = (unsigned short *) (dataPtr->fromUnicode + 256);
for (hi = 0; hi < 256; hi++) {
if (dataPtr->toUnicode[hi] == NULL) {
dataPtr->toUnicode[hi] = emptyPage;
} else {
for (lo = 0; lo < 256; lo++) {
int ch;
ch = dataPtr->toUnicode[hi][lo];
if (ch != 0) {
unsigned short *page;
page = dataPtr->fromUnicode[ch >> 8];
if (page == NULL) {
page = pageMemPtr;
pageMemPtr += 256;
dataPtr->fromUnicode[ch >> 8] = page;
}
page[ch & 0xff] = (unsigned short) ((hi << 8) + lo);
}
}
}
}
if (type == ENCODING_MULTIBYTE) {
/*
* If multibyte encodings don't have a backslash character, define
* one. Otherwise, on Windows, native file names won't work because
* the backslash in the file name will map to the unknown character
* (question mark) when converting from UTF-8 to external encoding.
*/
if (dataPtr->fromUnicode[0] != NULL) {
if (dataPtr->fromUnicode[0]['\\'] == '\0') {
dataPtr->fromUnicode[0]['\\'] = '\\';
}
}
}
if (symbol) {
unsigned short *page;
/*
* Make a special symbol encoding that not only maps the symbol
* characters from their Unicode code points down into page 0, but
* also ensure that the characters on page 0 map to themselves.
* This is so that a symbol font can be used to display a simple
* string like "abcd" and have alpha, beta, chi, delta show up,
* rather than have "unknown" chars show up because strictly
* speaking the symbol font doesn't have glyphs for those low ascii
* chars.
*/
page = dataPtr->fromUnicode[0];
if (page == NULL) {
page = pageMemPtr;
dataPtr->fromUnicode[0] = page;
}
for (lo = 0; lo < 256; lo++) {
if (dataPtr->toUnicode[0][lo] != 0) {
page[lo] = (unsigned short) lo;
}
}
}
for (hi = 0; hi < 256; hi++) {
if (dataPtr->fromUnicode[hi] == NULL) {
dataPtr->fromUnicode[hi] = emptyPage;
}
}
encType.encodingName = name;
encType.toUtfProc = TableToUtfProc;
encType.fromUtfProc = TableFromUtfProc;
encType.freeProc = TableFreeProc;
encType.nullSize = (type == ENCODING_DOUBLEBYTE) ? 2 : 1;
encType.clientData = (ClientData) dataPtr;
return Tcl_CreateEncoding(&encType);
}
/*
*-------------------------------------------------------------------------
*
* LoadEscapeEncoding --
*
* Helper function for LoadEncodingTable(). Loads a state machine
* that converts between Unicode and some other encoding.
*
* File contains text data that describes the escape sequences that
* are used to choose an encoding and the associated names for the
* sub-encodings.
*
* Results:
* The return value is the new encoding, or NULL if the encoding
* could not be created (because the file contained invalid data).
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
static Tcl_Encoding
LoadEscapeEncoding(name, chan)
CONST char *name; /* Name for new encoding. */
Tcl_Channel chan; /* File containing new encoding. */
{
int i;
unsigned int size;
Tcl_DString escapeData;
char init[16], final[16];
EscapeEncodingData *dataPtr;
Tcl_EncodingType type;
init[0] = '\0';
final[0] = '\0';
Tcl_DStringInit(&escapeData);
while (1) {
int argc;
CONST char **argv;
char *line;
Tcl_DString lineString;
Tcl_DStringInit(&lineString);
if (Tcl_Gets(chan, &lineString) < 0) {
break;
}
line = Tcl_DStringValue(&lineString);
if (Tcl_SplitList(NULL, line, &argc, &argv) != TCL_OK) {
continue;
}
if (argc >= 2) {
if (strcmp(argv[0], "name") == 0) {
;
} else if (strcmp(argv[0], "init") == 0) {
strncpy(init, argv[1], sizeof(init));
init[sizeof(init) - 1] = '\0';
} else if (strcmp(argv[0], "final") == 0) {
strncpy(final, argv[1], sizeof(final));
final[sizeof(final) - 1] = '\0';
} else {
EscapeSubTable est;
strncpy(est.sequence, argv[1], sizeof(est.sequence));
est.sequence[sizeof(est.sequence) - 1] = '\0';
est.sequenceLen = strlen(est.sequence);
strncpy(est.name, argv[0], sizeof(est.name));
est.name[sizeof(est.name) - 1] = '\0';
est.encodingPtr = NULL;
Tcl_DStringAppend(&escapeData, (char *) &est, sizeof(est));
}
}
ckfree((char *) argv);
Tcl_DStringFree(&lineString);
}
size = sizeof(EscapeEncodingData)
- sizeof(EscapeSubTable) + Tcl_DStringLength(&escapeData);
dataPtr = (EscapeEncodingData *) ckalloc(size);
dataPtr->initLen = strlen(init);
strcpy(dataPtr->init, init);
dataPtr->finalLen = strlen(final);
strcpy(dataPtr->final, final);
dataPtr->numSubTables = Tcl_DStringLength(&escapeData) / sizeof(EscapeSubTable);
memcpy((VOID *) dataPtr->subTables, (VOID *) Tcl_DStringValue(&escapeData),
(size_t) Tcl_DStringLength(&escapeData));
Tcl_DStringFree(&escapeData);
memset(dataPtr->prefixBytes, 0, sizeof(dataPtr->prefixBytes));
for (i = 0; i < dataPtr->numSubTables; i++) {
dataPtr->prefixBytes[UCHAR(dataPtr->subTables[i].sequence[0])] = 1;
}
if (dataPtr->init[0] != '\0') {
dataPtr->prefixBytes[UCHAR(dataPtr->init[0])] = 1;
}
if (dataPtr->final[0] != '\0') {
dataPtr->prefixBytes[UCHAR(dataPtr->final[0])] = 1;
}
type.encodingName = name;
type.toUtfProc = EscapeToUtfProc;
type.fromUtfProc = EscapeFromUtfProc;
type.freeProc = EscapeFreeProc;
type.nullSize = 1;
type.clientData = (ClientData) dataPtr;
return Tcl_CreateEncoding(&type);
}
/*
*-------------------------------------------------------------------------
*
* BinaryProc --
*
* The default conversion when no other conversion is specified.
* No translation is done; source bytes are copied directly to
* destination bytes.
*
* Results:
* Returns TCL_OK if conversion was successful.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
static int
BinaryProc(clientData, src, srcLen, flags, statePtr, dst, dstLen,
srcReadPtr, dstWrotePtr, dstCharsPtr)
ClientData clientData; /* Not used. */
CONST char *src; /* Source string (unknown encoding). */
int srcLen; /* Source string length in bytes. */
int flags; /* Conversion control flags. */
Tcl_EncodingState *statePtr;/* Place for conversion routine to store
* state information used during a piecewise
* conversion. Contents of statePtr are
* initialized and/or reset by conversion
* routine under control of flags argument. */
char *dst; /* Output buffer in which converted string
* is stored. */
int dstLen; /* The maximum length of output buffer in
* bytes. */
int *srcReadPtr; /* Filled with the number of bytes from the
* source string that were converted. */
int *dstWrotePtr; /* Filled with the number of bytes that were
* stored in the output buffer as a result of
* the conversion. */
int *dstCharsPtr; /* Filled with the number of characters that
* correspond to the bytes stored in the
* output buffer. */
{
int result;
result = TCL_OK;
dstLen -= TCL_UTF_MAX - 1;
if (dstLen < 0) {
dstLen = 0;
}
if (srcLen > dstLen) {
srcLen = dstLen;
result = TCL_CONVERT_NOSPACE;
}
*srcReadPtr = srcLen;
*dstWrotePtr = srcLen;
*dstCharsPtr = srcLen;
for ( ; --srcLen >= 0; ) {
*dst++ = *src++;
}
return result;
}
/*
*-------------------------------------------------------------------------
*
* UtfToUtfProc --
*
* Convert from UTF-8 to UTF-8. Note that the UTF-8 to UTF-8
* translation is not a no-op, because it will turn a stream of
* improperly formed UTF-8 into a properly formed stream.
*
* Results:
* Returns TCL_OK if conversion was successful.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
static int
UtfToUtfProc(clientData, src, srcLen, flags, statePtr, dst, dstLen,
srcReadPtr, dstWrotePtr, dstCharsPtr)
ClientData clientData; /* Not used. */
CONST char *src; /* Source string in UTF-8. */
int srcLen; /* Source string length in bytes. */
int flags; /* Conversion control flags. */
Tcl_EncodingState *statePtr;/* Place for conversion routine to store
* state information used during a piecewise
* conversion. Contents of statePtr are
* initialized and/or reset by conversion
* routine under control of flags argument. */
char *dst; /* Output buffer in which converted string
* is stored. */
int dstLen; /* The maximum length of output buffer in
* bytes. */
int *srcReadPtr; /* Filled with the number of bytes from the
* source string that were converted. This
* may be less than the original source length
* if there was a problem converting some
* source characters. */
int *dstWrotePtr; /* Filled with the number of bytes that were
* stored in the output buffer as a result of
* the conversion. */
int *dstCharsPtr; /* Filled with the number of characters that
* correspond to the bytes stored in the
* output buffer. */
{
CONST char *srcStart, *srcEnd, *srcClose;
char *dstStart, *dstEnd;
int result, numChars;
Tcl_UniChar ch;
result = TCL_OK;
srcStart = src;
srcEnd = src + srcLen;
srcClose = srcEnd;
if ((flags & TCL_ENCODING_END) == 0) {
srcClose -= TCL_UTF_MAX;
}
dstStart = dst;
dstEnd = dst + dstLen - TCL_UTF_MAX;
for (numChars = 0; src < srcEnd; numChars++) {
if ((src > srcClose) && (!Tcl_UtfCharComplete(src, srcEnd - src))) {
/*
* If there is more string to follow, this will ensure that the
* last UTF-8 character in the source buffer hasn't been cut off.
*/
result = TCL_CONVERT_MULTIBYTE;
break;
}
if (dst > dstEnd) {
result = TCL_CONVERT_NOSPACE;
break;
}
src += Tcl_UtfToUniChar(src, &ch);
dst += Tcl_UniCharToUtf(ch, dst);
}
*srcReadPtr = src - srcStart;
*dstWrotePtr = dst - dstStart;
*dstCharsPtr = numChars;
return result;
}
/*
*-------------------------------------------------------------------------
*
* UnicodeToUtfProc --
*
* Convert from Unicode to UTF-8.
*
* Results:
* Returns TCL_OK if conversion was successful.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
static int
UnicodeToUtfProc(clientData, src, srcLen, flags, statePtr, dst, dstLen,
srcReadPtr, dstWrotePtr, dstCharsPtr)
ClientData clientData; /* Not used. */
CONST char *src; /* Source string in Unicode. */
int srcLen; /* Source string length in bytes. */
int flags; /* Conversion control flags. */
Tcl_EncodingState *statePtr;/* Place for conversion routine to store
* state information used during a piecewise
* conversion. Contents of statePtr are
* initialized and/or reset by conversion
* routine under control of flags argument. */
char *dst; /* Output buffer in which converted string
* is stored. */
int dstLen; /* The maximum length of output buffer in
* bytes. */
int *srcReadPtr; /* Filled with the number of bytes from the
* source string that were converted. This
* may be less than the original source length
* if there was a problem converting some
* source characters. */
int *dstWrotePtr; /* Filled with the number of bytes that were
* stored in the output buffer as a result of
* the conversion. */
int *dstCharsPtr; /* Filled with the number of characters that
* correspond to the bytes stored in the
* output buffer. */
{
CONST Tcl_UniChar *wSrc, *wSrcStart, *wSrcEnd;
char *dstEnd, *dstStart;
int result, numChars;
result = TCL_OK;
if ((srcLen % sizeof(Tcl_UniChar)) != 0) {
result = TCL_CONVERT_MULTIBYTE;
srcLen /= sizeof(Tcl_UniChar);
srcLen *= sizeof(Tcl_UniChar);
}
wSrc = (Tcl_UniChar *) src;
wSrcStart = (Tcl_UniChar *) src;
wSrcEnd = (Tcl_UniChar *) (src + srcLen);
dstStart = dst;
dstEnd = dst + dstLen - TCL_UTF_MAX;
for (numChars = 0; wSrc < wSrcEnd; numChars++) {
if (dst > dstEnd) {
result = TCL_CONVERT_NOSPACE;
break;
}
dst += Tcl_UniCharToUtf(*wSrc, dst);
wSrc++;
}
*srcReadPtr = (char *) wSrc - (char *) wSrcStart;
*dstWrotePtr = dst - dstStart;
*dstCharsPtr = numChars;
return result;
}
/*
*-------------------------------------------------------------------------
*
* UtfToUnicodeProc --
*
* Convert from UTF-8 to Unicode.
*
* Results:
* Returns TCL_OK if conversion was successful.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
static int
UtfToUnicodeProc(clientData, src, srcLen, flags, statePtr, dst, dstLen,
srcReadPtr, dstWrotePtr, dstCharsPtr)
ClientData clientData; /* TableEncodingData that specifies encoding. */
CONST char *src; /* Source string in UTF-8. */
int srcLen; /* Source string length in bytes. */
int flags; /* Conversion control flags. */
Tcl_EncodingState *statePtr;/* Place for conversion routine to store
* state information used during a piecewise
* conversion. Contents of statePtr are
* initialized and/or reset by conversion
* routine under control of flags argument. */
char *dst; /* Output buffer in which converted string
* is stored. */
int dstLen; /* The maximum length of output buffer in
* bytes. */
int *srcReadPtr; /* Filled with the number of bytes from the
* source string that were converted. This
* may be less than the original source length
* if there was a problem converting some
* source characters. */
int *dstWrotePtr; /* Filled with the number of bytes that were
* stored in the output buffer as a result of
* the conversion. */
int *dstCharsPtr; /* Filled with the number of characters that
* correspond to the bytes stored in the
* output buffer. */
{
CONST char *srcStart, *srcEnd, *srcClose;
Tcl_UniChar *wDst, *wDstStart, *wDstEnd;
int result, numChars;
srcStart = src;
srcEnd = src + srcLen;
srcClose = srcEnd;
if ((flags & TCL_ENCODING_END) == 0) {
srcClose -= TCL_UTF_MAX;
}
wDst = (Tcl_UniChar *) dst;
wDstStart = (Tcl_UniChar *) dst;
wDstEnd = (Tcl_UniChar *) (dst + dstLen - sizeof(Tcl_UniChar));
result = TCL_OK;
for (numChars = 0; src < srcEnd; numChars++) {
if ((src > srcClose) && (!Tcl_UtfCharComplete(src, srcEnd - src))) {
/*
* If there is more string to follow, this will ensure that the
* last UTF-8 character in the source buffer hasn't been cut off.
*/
result = TCL_CONVERT_MULTIBYTE;
break;
}
if (wDst > wDstEnd) {
result = TCL_CONVERT_NOSPACE;
break;
}
src += Tcl_UtfToUniChar(src, wDst);
wDst++;
}
*srcReadPtr = src - srcStart;
*dstWrotePtr = (char *) wDst - (char *) wDstStart;
*dstCharsPtr = numChars;
return result;
}
/*
*-------------------------------------------------------------------------
*
* TableToUtfProc --
*
* Convert from the encoding specified by the TableEncodingData into
* UTF-8.
*
* Results:
* Returns TCL_OK if conversion was successful.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
static int
TableToUtfProc(clientData, src, srcLen, flags, statePtr, dst, dstLen,
srcReadPtr, dstWrotePtr, dstCharsPtr)
ClientData clientData; /* TableEncodingData that specifies
* encoding. */
CONST char *src; /* Source string in specified encoding. */
int srcLen; /* Source string length in bytes. */
int flags; /* Conversion control flags. */
Tcl_EncodingState *statePtr;/* Place for conversion routine to store
* state information used during a piecewise
* conversion. Contents of statePtr are
* initialized and/or reset by conversion
* routine under control of flags argument. */
char *dst; /* Output buffer in which converted string
* is stored. */
int dstLen; /* The maximum length of output buffer in
* bytes. */
int *srcReadPtr; /* Filled with the number of bytes from the
* source string that were converted. This
* may be less than the original source length
* if there was a problem converting some
* source characters. */
int *dstWrotePtr; /* Filled with the number of bytes that were
* stored in the output buffer as a result of
* the conversion. */
int *dstCharsPtr; /* Filled with the number of characters that
* correspond to the bytes stored in the
* output buffer. */
{
CONST char *srcStart, *srcEnd;
char *dstEnd, *dstStart, *prefixBytes;
int result, byte, numChars;
Tcl_UniChar ch;
unsigned short **toUnicode;
unsigned short *pageZero;
TableEncodingData *dataPtr;
srcStart = src;
srcEnd = src + srcLen;
dstStart = dst;
dstEnd = dst + dstLen - TCL_UTF_MAX;
dataPtr = (TableEncodingData *) clientData;
toUnicode = dataPtr->toUnicode;
prefixBytes = dataPtr->prefixBytes;
pageZero = toUnicode[0];
result = TCL_OK;
for (numChars = 0; src < srcEnd; numChars++) {
if (dst > dstEnd) {
result = TCL_CONVERT_NOSPACE;
break;
}
byte = *((unsigned char *) src);
if (prefixBytes[byte]) {
src++;
if (src >= srcEnd) {
src--;
result = TCL_CONVERT_MULTIBYTE;
break;
}
ch = toUnicode[byte][*((unsigned char *) src)];
} else {
ch = pageZero[byte];
}
if ((ch == 0) && (byte != 0)) {
if (flags & TCL_ENCODING_STOPONERROR) {
result = TCL_CONVERT_SYNTAX;
break;
}
if (prefixBytes[byte]) {
src--;
}
ch = (Tcl_UniChar) byte;
}
dst += Tcl_UniCharToUtf(ch, dst);
src++;
}
*srcReadPtr = src - srcStart;
*dstWrotePtr = dst - dstStart;
*dstCharsPtr = numChars;
return result;
}
/*
*-------------------------------------------------------------------------
*
* TableFromUtfProc --
*
* Convert from UTF-8 into the encoding specified by the
* TableEncodingData.
*
* Results:
* Returns TCL_OK if conversion was successful.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
static int
TableFromUtfProc(clientData, src, srcLen, flags, statePtr, dst, dstLen,
srcReadPtr, dstWrotePtr, dstCharsPtr)
ClientData clientData; /* TableEncodingData that specifies
* encoding. */
CONST char *src; /* Source string in UTF-8. */
int srcLen; /* Source string length in bytes. */
int flags; /* Conversion control flags. */
Tcl_EncodingState *statePtr;/* Place for conversion routine to store
* state information used during a piecewise
* conversion. Contents of statePtr are
* initialized and/or reset by conversion
* routine under control of flags argument. */
char *dst; /* Output buffer in which converted string
* is stored. */
int dstLen; /* The maximum length of output buffer in
* bytes. */
int *srcReadPtr; /* Filled with the number of bytes from the
* source string that were converted. This
* may be less than the original source length
* if there was a problem converting some
* source characters. */
int *dstWrotePtr; /* Filled with the number of bytes that were
* stored in the output buffer as a result of
* the conversion. */
int *dstCharsPtr; /* Filled with the number of characters that
* correspond to the bytes stored in the
* output buffer. */
{
CONST char *srcStart, *srcEnd, *srcClose;
char *dstStart, *dstEnd, *prefixBytes;
Tcl_UniChar ch;
int result, len, word, numChars;
TableEncodingData *dataPtr;
unsigned short **fromUnicode;
result = TCL_OK;
dataPtr = (TableEncodingData *) clientData;
prefixBytes = dataPtr->prefixBytes;
fromUnicode = dataPtr->fromUnicode;
srcStart = src;
srcEnd = src + srcLen;
srcClose = srcEnd;
if ((flags & TCL_ENCODING_END) == 0) {
srcClose -= TCL_UTF_MAX;
}
dstStart = dst;
dstEnd = dst + dstLen - 1;
for (numChars = 0; src < srcEnd; numChars++) {
if ((src > srcClose) && (!Tcl_UtfCharComplete(src, srcEnd - src))) {
/*
* If there is more string to follow, this will ensure that the
* last UTF-8 character in the source buffer hasn't been cut off.
*/
result = TCL_CONVERT_MULTIBYTE;
break;
}
len = Tcl_UtfToUniChar(src, &ch);
word = fromUnicode[(ch >> 8)][ch & 0xff];
if ((word == 0) && (ch != 0)) {
if (flags & TCL_ENCODING_STOPONERROR) {
result = TCL_CONVERT_UNKNOWN;
break;
}
word = dataPtr->fallback;
}
if (prefixBytes[(word >> 8)] != 0) {
if (dst + 1 > dstEnd) {
result = TCL_CONVERT_NOSPACE;
break;
}
dst[0] = (char) (word >> 8);
dst[1] = (char) word;
dst += 2;
} else {
if (dst > dstEnd) {
result = TCL_CONVERT_NOSPACE;
break;
}
dst[0] = (char) word;
dst++;
}
src += len;
}
*srcReadPtr = src - srcStart;
*dstWrotePtr = dst - dstStart;
*dstCharsPtr = numChars;
return result;
}
/*
*---------------------------------------------------------------------------
*
* TableFreeProc --
*
* This procedure is invoked when an encoding is deleted. It deletes
* the memory used by the TableEncodingData.
*
* Results:
* None.
*
* Side effects:
* Memory freed.
*
*---------------------------------------------------------------------------
*/
static void
TableFreeProc(clientData)
ClientData clientData; /* TableEncodingData that specifies
* encoding. */
{
TableEncodingData *dataPtr;
/*
* Make sure we aren't freeing twice on shutdown. [Bug #219314]
*/
dataPtr = (TableEncodingData *) clientData;
ckfree((char *) dataPtr->toUnicode);
ckfree((char *) dataPtr->fromUnicode);
ckfree((char *) dataPtr);
}
/*
*-------------------------------------------------------------------------
*
* EscapeToUtfProc --
*
* Convert from the encoding specified by the EscapeEncodingData into
* UTF-8.
*
* Results:
* Returns TCL_OK if conversion was successful.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
static int
EscapeToUtfProc(clientData, src, srcLen, flags, statePtr, dst, dstLen,
srcReadPtr, dstWrotePtr, dstCharsPtr)
ClientData clientData; /* EscapeEncodingData that specifies
* encoding. */
CONST char *src; /* Source string in specified encoding. */
int srcLen; /* Source string length in bytes. */
int flags; /* Conversion control flags. */
Tcl_EncodingState *statePtr;/* Place for conversion routine to store
* state information used during a piecewise
* conversion. Contents of statePtr are
* initialized and/or reset by conversion
* routine under control of flags argument. */
char *dst; /* Output buffer in which converted string
* is stored. */
int dstLen; /* The maximum length of output buffer in
* bytes. */
int *srcReadPtr; /* Filled with the number of bytes from the
* source string that were converted. This
* may be less than the original source length
* if there was a problem converting some
* source characters. */
int *dstWrotePtr; /* Filled with the number of bytes that were
* stored in the output buffer as a result of
* the conversion. */
int *dstCharsPtr; /* Filled with the number of characters that
* correspond to the bytes stored in the
* output buffer. */
{
EscapeEncodingData *dataPtr;
char *prefixBytes, *tablePrefixBytes;
unsigned short **tableToUnicode;
Encoding *encodingPtr;
int state, result, numChars;
CONST char *srcStart, *srcEnd;
char *dstStart, *dstEnd;
result = TCL_OK;
tablePrefixBytes = NULL; /* lint. */
tableToUnicode = NULL; /* lint. */
dataPtr = (EscapeEncodingData *) clientData;
prefixBytes = dataPtr->prefixBytes;
encodingPtr = NULL;
srcStart = src;
srcEnd = src + srcLen;
dstStart = dst;
dstEnd = dst + dstLen - TCL_UTF_MAX;
state = (int) *statePtr;
if (flags & TCL_ENCODING_START) {
state = 0;
}
for (numChars = 0; src < srcEnd; ) {
int byte, hi, lo, ch;
if (dst > dstEnd) {
result = TCL_CONVERT_NOSPACE;
break;
}
byte = *((unsigned char *) src);
if (prefixBytes[byte]) {
unsigned int left, len, longest;
int checked, i;
EscapeSubTable *subTablePtr;
/*
* Saw the beginning of an escape sequence.
*/
left = srcEnd - src;
len = dataPtr->initLen;
longest = len;
checked = 0;
if (len <= left) {
checked++;
if ((len > 0) &&
(memcmp(src, dataPtr->init, len) == 0)) {
/*
* If we see initialization string, skip it, even if we're
* not at the beginning of the buffer.
*/
src += len;
continue;
}
}
len = dataPtr->finalLen;
if (len > longest) {
longest = len;
}
if (len <= left) {
checked++;
if ((len > 0) &&
(memcmp(src, dataPtr->final, len) == 0)) {
/*
* If we see finalization string, skip it, even if we're
* not at the end of the buffer.
*/
src += len;
continue;
}
}
subTablePtr = dataPtr->subTables;
for (i = 0; i < dataPtr->numSubTables; i++) {
len = subTablePtr->sequenceLen;
if (len > longest) {
longest = len;
}
if (len <= left) {
checked++;
if ((len > 0) &&
(memcmp(src, subTablePtr->sequence, len) == 0)) {
state = i;
encodingPtr = NULL;
subTablePtr = NULL;
src += len;
break;
}
}
subTablePtr++;
}
if (subTablePtr == NULL) {
/*
* A match was found, the escape sequence was consumed, and
* the state was updated.
*/
continue;
}
/*
* We have a split-up or unrecognized escape sequence. If we
* checked all the sequences, then it's a syntax error,
* otherwise we need more bytes to determine a match.
*/
if ((checked == dataPtr->numSubTables + 2)
|| (flags & TCL_ENCODING_END)) {
if ((flags & TCL_ENCODING_STOPONERROR) == 0) {
/*
* Skip the unknown escape sequence.
*/
src += longest;
continue;
}
result = TCL_CONVERT_SYNTAX;
} else {
result = TCL_CONVERT_MULTIBYTE;
}
break;
}
if (encodingPtr == NULL) {
TableEncodingData *tableDataPtr;
encodingPtr = GetTableEncoding(dataPtr, state);
tableDataPtr = (TableEncodingData *) encodingPtr->clientData;
tablePrefixBytes = tableDataPtr->prefixBytes;
tableToUnicode = tableDataPtr->toUnicode;
}
if (tablePrefixBytes[byte]) {
src++;
if (src >= srcEnd) {
src--;
result = TCL_CONVERT_MULTIBYTE;
break;
}
hi = byte;
lo = *((unsigned char *) src);
} else {
hi = 0;
lo = byte;
}
ch = tableToUnicode[hi][lo];
dst += Tcl_UniCharToUtf(ch, dst);
src++;
numChars++;
}
*statePtr = (Tcl_EncodingState) state;
*srcReadPtr = src - srcStart;
*dstWrotePtr = dst - dstStart;
*dstCharsPtr = numChars;
return result;
}
/*
*-------------------------------------------------------------------------
*
* EscapeFromUtfProc --
*
* Convert from UTF-8 into the encoding specified by the
* EscapeEncodingData.
*
* Results:
* Returns TCL_OK if conversion was successful.
*
* Side effects:
* None.
*
*-------------------------------------------------------------------------
*/
static int
EscapeFromUtfProc(clientData, src, srcLen, flags, statePtr, dst, dstLen,
srcReadPtr, dstWrotePtr, dstCharsPtr)
ClientData clientData; /* EscapeEncodingData that specifies
* encoding. */
CONST char *src; /* Source string in UTF-8. */
int srcLen; /* Source string length in bytes. */
int flags; /* Conversion control flags. */
Tcl_EncodingState *statePtr;/* Place for conversion routine to store
* state information used during a piecewise
* conversion. Contents of statePtr are
* initialized and/or reset by conversion
* routine under control of flags argument. */
char *dst; /* Output buffer in which converted string
* is stored. */
int dstLen; /* The maximum length of output buffer in
* bytes. */
int *srcReadPtr; /* Filled with the number of bytes from the
* source string that were converted. This
* may be less than the original source length
* if there was a problem converting some
* source characters. */
int *dstWrotePtr; /* Filled with the number of bytes that were
* stored in the output buffer as a result of
* the conversion. */
int *dstCharsPtr; /* Filled with the number of characters that
* correspond to the bytes stored in the
* output buffer. */
{
EscapeEncodingData *dataPtr;
Encoding *encodingPtr;
CONST char *srcStart, *srcEnd, *srcClose;
char *dstStart, *dstEnd;
int state, result, numChars;
TableEncodingData *tableDataPtr;
char *tablePrefixBytes;
unsigned short **tableFromUnicode;
result = TCL_OK;
dataPtr = (EscapeEncodingData *) clientData;
srcStart = src;
srcEnd = src + srcLen;
srcClose = srcEnd;
if ((flags & TCL_ENCODING_END) == 0) {
srcClose -= TCL_UTF_MAX;
}
dstStart = dst;
dstEnd = dst + dstLen - 1;
/*
* RFC1468 states that the text starts in ASCII, and switches to Japanese
* characters, and that the text must end in ASCII. [Patch #474358]
*/
if (flags & TCL_ENCODING_START) {
state = 0;
if (dst + dataPtr->initLen > dstEnd) {
*srcReadPtr = 0;
*dstWrotePtr = 0;
return TCL_CONVERT_NOSPACE;
}
memcpy((VOID *) dst, (VOID *) dataPtr->init,
(size_t) dataPtr->initLen);
dst += dataPtr->initLen;
} else {
state = (int) *statePtr;
}
encodingPtr = GetTableEncoding(dataPtr, state);
tableDataPtr = (TableEncodingData *) encodingPtr->clientData;
tablePrefixBytes = tableDataPtr->prefixBytes;
tableFromUnicode = tableDataPtr->fromUnicode;
for (numChars = 0; src < srcEnd; numChars++) {
unsigned int len;
int word;
Tcl_UniChar ch;
if ((src > srcClose) && (!Tcl_UtfCharComplete(src, srcEnd - src))) {
/*
* If there is more string to follow, this will ensure that the
* last UTF-8 character in the source buffer hasn't been cut off.
*/
result = TCL_CONVERT_MULTIBYTE;
break;
}
len = Tcl_UtfToUniChar(src, &ch);
word = tableFromUnicode[(ch >> 8)][ch & 0xff];
if ((word == 0) && (ch != 0)) {
int oldState;
EscapeSubTable *subTablePtr;
oldState = state;
for (state = 0; state < dataPtr->numSubTables; state++) {
encodingPtr = GetTableEncoding(dataPtr, state);
tableDataPtr = (TableEncodingData *) encodingPtr->clientData;
word = tableDataPtr->fromUnicode[(ch >> 8)][ch & 0xff];
if (word != 0) {
break;
}
}
if (word == 0) {
state = oldState;
if (flags & TCL_ENCODING_STOPONERROR) {
result = TCL_CONVERT_UNKNOWN;
break;
}
encodingPtr = GetTableEncoding(dataPtr, state);
tableDataPtr = (TableEncodingData *) encodingPtr->clientData;
word = tableDataPtr->fallback;
}
tablePrefixBytes = tableDataPtr->prefixBytes;
tableFromUnicode = tableDataPtr->fromUnicode;
/*
* The state variable has the value of oldState when word is 0.
* In this case, the escape sequense should not be copied to dst
* because the current character set is not changed.
*/
if (state != oldState) {
subTablePtr = &dataPtr->subTables[state];
if ((dst + subTablePtr->sequenceLen) > dstEnd) {
/*
* If there is no space to write the escape sequence, the
* state variable must be changed to the value of oldState
* variable because this escape sequence must be written
* in the next conversion.
*/
state = oldState;
result = TCL_CONVERT_NOSPACE;
break;
}
memcpy((VOID *) dst, (VOID *) subTablePtr->sequence,
(size_t) subTablePtr->sequenceLen);
dst += subTablePtr->sequenceLen;
}
}
if (tablePrefixBytes[(word >> 8)] != 0) {
if (dst + 1 > dstEnd) {
result = TCL_CONVERT_NOSPACE;
break;
}
dst[0] = (char) (word >> 8);
dst[1] = (char) word;
dst += 2;
} else {
if (dst > dstEnd) {
result = TCL_CONVERT_NOSPACE;
break;
}
dst[0] = (char) word;
dst++;
}
src += len;
}
if ((result == TCL_OK) && (flags & TCL_ENCODING_END)) {
unsigned int len = dataPtr->subTables[0].sequenceLen;
if (dst + dataPtr->finalLen + (state?len:0) > dstEnd) {
result = TCL_CONVERT_NOSPACE;
} else {
if (state) {
memcpy((VOID *) dst, (VOID *) dataPtr->subTables[0].sequence,
(size_t) len);
dst += len;
}
memcpy((VOID *) dst, (VOID *) dataPtr->final,
(size_t) dataPtr->finalLen);
dst += dataPtr->finalLen;
}
}
*statePtr = (Tcl_EncodingState) state;
*srcReadPtr = src - srcStart;
*dstWrotePtr = dst - dstStart;
*dstCharsPtr = numChars;
return result;
}
/*
*---------------------------------------------------------------------------
*
* EscapeFreeProc --
*
* This procedure is invoked when an EscapeEncodingData encoding is
* deleted. It deletes the memory used by the encoding.
*
* Results:
* None.
*
* Side effects:
* Memory freed.
*
*---------------------------------------------------------------------------
*/
static void
EscapeFreeProc(clientData)
ClientData clientData; /* EscapeEncodingData that specifies encoding. */
{
EscapeEncodingData *dataPtr;
EscapeSubTable *subTablePtr;
int i;
dataPtr = (EscapeEncodingData *) clientData;
if (dataPtr == NULL) {
return;
}
subTablePtr = dataPtr->subTables;
for (i = 0; i < dataPtr->numSubTables; i++) {
FreeEncoding((Tcl_Encoding) subTablePtr->encodingPtr);
subTablePtr++;
}
ckfree((char *) dataPtr);
}
/*
*---------------------------------------------------------------------------
*
* GetTableEncoding --
*
* Helper function for the EscapeEncodingData conversions. Gets the
* encoding (of type TextEncodingData) that represents the specified
* state.
*
* Results:
* The return value is the encoding.
*
* Side effects:
* If the encoding that represents the specified state has not
* already been used by this EscapeEncoding, it will be loaded
* and cached in the dataPtr.
*
*---------------------------------------------------------------------------
*/
static Encoding *
GetTableEncoding(dataPtr, state)
EscapeEncodingData *dataPtr;/* Contains names of encodings. */
int state; /* Index in dataPtr of desired Encoding. */
{
EscapeSubTable *subTablePtr;
Encoding *encodingPtr;
subTablePtr = &dataPtr->subTables[state];
encodingPtr = subTablePtr->encodingPtr;
if (encodingPtr == NULL) {
encodingPtr = (Encoding *) Tcl_GetEncoding(NULL, subTablePtr->name);
if ((encodingPtr == NULL)
|| (encodingPtr->toUtfProc != TableToUtfProc)) {
panic("EscapeToUtfProc: invalid sub table");
}
subTablePtr->encodingPtr = encodingPtr;
}
return encodingPtr;
}
/*
*---------------------------------------------------------------------------
*
* unilen --
*
* A helper function for the Tcl_ExternalToUtf functions. This
* function is similar to strlen for double-byte characters: it
* returns the number of bytes in a 0x0000 terminated string.
*
* Results:
* As above.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
static size_t
unilen(src)
CONST char *src;
{
unsigned short *p;
p = (unsigned short *) src;
while (*p != 0x0000) {
p++;
}
return (char *) p - src;
}
/*
*-------------------------------------------------------------------------
*
* TclFindEncodings --
*
* Find and load the encoding file for this operating system.
* Before this is called, Tcl makes assumptions about the
* native string representation, but the true encoding is not
* assured.
*
* Results:
* None.
*
* Side effects:
* Varied, see the respective initialization routines.
*
*-------------------------------------------------------------------------
*/
void
TclFindEncodings(argv0)
CONST char *argv0; /* Name of executable from argv[0] to main()
* in native multi-byte encoding. */
{
char *native;
Tcl_Obj *pathPtr;
Tcl_DString libPath, buffer;
if (encodingsInitialized == 0) {
/*
* Double check inside the mutex. There may be calls
* back into this routine from some of the procedures below.
*/
TclpInitLock();
if (encodingsInitialized == 0) {
/*
* Have to set this bit here to avoid deadlock with the
* routines below us that call into TclInitSubsystems.
*/
encodingsInitialized = 1;
native = TclpFindExecutable(argv0);
TclpInitLibraryPath(native);
/*
* The library path was set in the TclpInitLibraryPath routine.
* The string set is a dirty UTF string. To preserve the value
* convert the UTF string back to native before setting the new
* default encoding.
*/
pathPtr = TclGetLibraryPath();
if (pathPtr != NULL) {
Tcl_UtfToExternalDString(NULL, Tcl_GetString(pathPtr), -1,
&libPath);
}
TclpSetInitialEncodings();
/*
* Now convert the native string back to UTF.
*/
if (pathPtr != NULL) {
Tcl_ExternalToUtfDString(NULL, Tcl_DStringValue(&libPath), -1,
&buffer);
pathPtr = Tcl_NewStringObj(Tcl_DStringValue(&buffer), -1);
TclSetLibraryPath(pathPtr);
Tcl_DStringFree(&libPath);
Tcl_DStringFree(&buffer);
}
}
TclpInitUnlock();
}
}
See more files for this project here