/* * tclStringObj.c -- * * This file contains functions that implement string operations on Tcl * objects. Some string operations work with UTF strings and others * require Unicode format. Functions that require knowledge of the width * of each character, such as indexing, operate on Unicode data. * * A Unicode string is an internationalized string. Conceptually, a * Unicode string is an array of 16-bit quantities organized as a * sequence of properly formed UTF-8 characters. There is a one-to-one * map between Unicode and UTF characters. Because Unicode characters * have a fixed width, operations such as indexing operate on Unicode * data. The String object is optimized for the case where each UTF char * in a string is only one byte. In this case, we store the value of * numChars, but we don't store the Unicode data (unless Tcl_GetUnicode * is explicitly called). * * The String object type stores one or both formats. The default * behavior is to store UTF. Once Unicode is calculated by a function, it * is stored in the internal rep for future access (without an additional * O(n) cost). * * To allow many appends to be done to an object without constantly * reallocating the space for the string or Unicode representation, we * allocate double the space for the string or Unicode and use the * internal representation to keep track of how much space is used vs. * allocated. * * Copyright (c) 1995-1997 Sun Microsystems, Inc. * Copyright (c) 1999 by Scriptics Corporation. * * 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 "tommath.h" #include "tclStringRep.h" /* * Set COMPAT to 1 to restore the shimmering patterns to those of Tcl 8.5. * This is an escape hatch in case the changes have some unexpected unwelcome * impact on performance. If things go well, this mechanism can go away when * post-8.6 development begins. */ #define COMPAT 0 /* * Prototypes for functions defined later in this file: */ static void AppendPrintfToObjVA(Tcl_Obj *objPtr, const char *format, va_list argList); static void AppendUnicodeToUnicodeRep(Tcl_Obj *objPtr, const Tcl_UniChar *unicode, int appendNumChars); static void AppendUnicodeToUtfRep(Tcl_Obj *objPtr, const Tcl_UniChar *unicode, int numChars); static void AppendUtfToUnicodeRep(Tcl_Obj *objPtr, const char *bytes, int numBytes); static void AppendUtfToUtfRep(Tcl_Obj *objPtr, const char *bytes, int numBytes); static void DupStringInternalRep(Tcl_Obj *objPtr, Tcl_Obj *copyPtr); static int ExtendStringRepWithUnicode(Tcl_Obj *objPtr, const Tcl_UniChar *unicode, int numChars); static void ExtendUnicodeRepWithString(Tcl_Obj *objPtr, const char *bytes, int numBytes, int numAppendChars); static void FillUnicodeRep(Tcl_Obj *objPtr); static void FreeStringInternalRep(Tcl_Obj *objPtr); static void GrowStringBuffer(Tcl_Obj *objPtr, int needed, int flag); static void GrowUnicodeBuffer(Tcl_Obj *objPtr, int needed); static int SetStringFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr); static void SetUnicodeObj(Tcl_Obj *objPtr, const Tcl_UniChar *unicode, int numChars); static int UnicodeLength(const Tcl_UniChar *unicode); static void UpdateStringOfString(Tcl_Obj *objPtr); /* * The structure below defines the string Tcl object type by means of * functions that can be invoked by generic object code. */ const Tcl_ObjType tclStringType = { "string", /* name */ FreeStringInternalRep, /* freeIntRepPro */ DupStringInternalRep, /* dupIntRepProc */ UpdateStringOfString, /* updateStringProc */ SetStringFromAny /* setFromAnyProc */ }; /* * TCL STRING GROWTH ALGORITHM * * When growing strings (during an append, for example), the following growth * algorithm is used: * * Attempt to allocate 2 * (originalLength + appendLength) * On failure: * attempt to allocate originalLength + 2*appendLength + TCL_MIN_GROWTH * * This algorithm allows very good performance, as it rapidly increases the * memory allocated for a given string, which minimizes the number of * reallocations that must be performed. However, using only the doubling * algorithm can lead to a significant waste of memory. In particular, it may * fail even when there is sufficient memory available to complete the append * request (but there is not 2*totalLength memory available). So when the * doubling fails (because there is not enough memory available), the * algorithm requests a smaller amount of memory, which is still enough to * cover the request, but which hopefully will be less than the total * available memory. * * The addition of TCL_MIN_GROWTH allows for efficient handling of very * small appends. Without this extra slush factor, a sequence of several small * appends would cause several memory allocations. As long as * TCL_MIN_GROWTH is a reasonable size, we can avoid that behavior. * * The growth algorithm can be tuned by adjusting the following parameters: * * TCL_MIN_GROWTH Additional space, in bytes, to allocate when * the double allocation has failed. Default is * 1024 (1 kilobyte). See tclInt.h. */ #ifndef TCL_MIN_UNICHAR_GROWTH #define TCL_MIN_UNICHAR_GROWTH TCL_MIN_GROWTH/sizeof(Tcl_UniChar) #endif static void GrowStringBuffer( Tcl_Obj *objPtr, int needed, int flag) { /* * Preconditions: * objPtr->typePtr == &tclStringType * needed > stringPtr->allocated * flag || objPtr->bytes != NULL */ String *stringPtr = GET_STRING(objPtr); char *ptr = NULL; int attempt; if (objPtr->bytes == tclEmptyStringRep) { objPtr->bytes = NULL; } if (flag == 0 || stringPtr->allocated > 0) { if (needed <= INT_MAX / 2) { attempt = 2 * needed; ptr = (char *)attemptckrealloc(objPtr->bytes, attempt + 1U); } if (ptr == NULL) { /* * Take care computing the amount of modest growth to avoid * overflow into invalid argument values for attempt. */ unsigned int limit = INT_MAX - needed; unsigned int extra = needed - objPtr->length + TCL_MIN_GROWTH; int growth = (int) ((extra > limit) ? limit : extra); attempt = needed + growth; ptr = (char *)attemptckrealloc(objPtr->bytes, attempt + 1U); } } if (ptr == NULL) { /* * First allocation - just big enough; or last chance fallback. */ attempt = needed; ptr = (char *)ckrealloc(objPtr->bytes, attempt + 1U); } objPtr->bytes = ptr; stringPtr->allocated = attempt; } static void GrowUnicodeBuffer( Tcl_Obj *objPtr, int needed) { /* * Preconditions: * objPtr->typePtr == &tclStringType * needed > stringPtr->maxChars * needed < STRING_MAXCHARS */ String *ptr = NULL, *stringPtr = GET_STRING(objPtr); int attempt; if (stringPtr->maxChars > 0) { /* * Subsequent appends - apply the growth algorithm. */ if (needed <= STRING_MAXCHARS / 2) { attempt = 2 * needed; ptr = stringAttemptRealloc(stringPtr, attempt); } if (ptr == NULL) { /* * Take care computing the amount of modest growth to avoid * overflow into invalid argument values for attempt. */ unsigned int limit = STRING_MAXCHARS - needed; unsigned int extra = needed - stringPtr->numChars + TCL_MIN_UNICHAR_GROWTH; int growth = (int) ((extra > limit) ? limit : extra); attempt = needed + growth; ptr = stringAttemptRealloc(stringPtr, attempt); } } if (ptr == NULL) { /* * First allocation - just big enough; or last chance fallback. */ attempt = needed; ptr = stringRealloc(stringPtr, attempt); } stringPtr = ptr; stringPtr->maxChars = attempt; SET_STRING(objPtr, stringPtr); } /* *---------------------------------------------------------------------- * * Tcl_NewStringObj -- * * This function is normally called when not debugging: i.e., when * TCL_MEM_DEBUG is not defined. It creates a new string object and * initializes it from the byte pointer and length arguments. * * When TCL_MEM_DEBUG is defined, this function just returns the result * of calling the debugging version Tcl_DbNewStringObj. * * Results: * A newly created string object is returned that has ref count zero. * * Side effects: * The new object's internal string representation will be set to a copy * of the length bytes starting at "bytes". If "length" is negative, use * bytes up to the first NUL byte; i.e., assume "bytes" points to a * C-style NUL-terminated string. The object's type is set to NULL. An * extra NUL is added to the end of the new object's byte array. * *---------------------------------------------------------------------- */ #ifdef TCL_MEM_DEBUG #undef Tcl_NewStringObj Tcl_Obj * Tcl_NewStringObj( const char *bytes, /* Points to the first of the length bytes * used to initialize the new object. */ int length) /* The number of bytes to copy from "bytes" * when initializing the new object. If * negative, use bytes up to the first NUL * byte. */ { return Tcl_DbNewStringObj(bytes, length, "unknown", 0); } #else /* if not TCL_MEM_DEBUG */ Tcl_Obj * Tcl_NewStringObj( const char *bytes, /* Points to the first of the length bytes * used to initialize the new object. */ int length) /* The number of bytes to copy from "bytes" * when initializing the new object. If * negative, use bytes up to the first NUL * byte. */ { Tcl_Obj *objPtr; if (length < 0) { length = (bytes? strlen(bytes) : 0); } TclNewStringObj(objPtr, bytes, length); return objPtr; } #endif /* TCL_MEM_DEBUG */ /* *---------------------------------------------------------------------- * * Tcl_DbNewStringObj -- * * This function is normally called when debugging: i.e., when * TCL_MEM_DEBUG is defined. It creates new string objects. It is the * same as the Tcl_NewStringObj function above except that it calls * Tcl_DbCkalloc directly with the file name and line number from its * caller. This simplifies debugging since then the [memory active] * command will report the correct file name and line number when * reporting objects that haven't been freed. * * When TCL_MEM_DEBUG is not defined, this function just returns the * result of calling Tcl_NewStringObj. * * Results: * A newly created string object is returned that has ref count zero. * * Side effects: * The new object's internal string representation will be set to a copy * of the length bytes starting at "bytes". If "length" is negative, use * bytes up to the first NUL byte; i.e., assume "bytes" points to a * C-style NUL-terminated string. The object's type is set to NULL. An * extra NUL is added to the end of the new object's byte array. * *---------------------------------------------------------------------- */ #ifdef TCL_MEM_DEBUG Tcl_Obj * Tcl_DbNewStringObj( const char *bytes, /* Points to the first of the length bytes * used to initialize the new object. */ int length, /* The number of bytes to copy from "bytes" * when initializing the new object. If * negative, use bytes up to the first NUL * byte. */ const char *file, /* The name of the source file calling this * function; used for debugging. */ int line) /* Line number in the source file; used for * debugging. */ { Tcl_Obj *objPtr; if (length < 0) { length = (bytes? strlen(bytes) : 0); } TclDbNewObj(objPtr, file, line); TclInitStringRep(objPtr, bytes, length); return objPtr; } #else /* if not TCL_MEM_DEBUG */ Tcl_Obj * Tcl_DbNewStringObj( const char *bytes, /* Points to the first of the length bytes * used to initialize the new object. */ int length, /* The number of bytes to copy from "bytes" * when initializing the new object. If * negative, use bytes up to the first NUL * byte. */ const char *file, /* The name of the source file calling this * function; used for debugging. */ int line) /* Line number in the source file; used for * debugging. */ { return Tcl_NewStringObj(bytes, length); } #endif /* TCL_MEM_DEBUG */ /* *--------------------------------------------------------------------------- * * Tcl_NewUnicodeObj -- * * This function is creates a new String object and initializes it from * the given Unicode String. If the Utf String is the same size as the * Unicode string, don't duplicate the data. * * Results: * The newly created object is returned. This object will have no initial * string representation. The returned object has a ref count of 0. * * Side effects: * Memory allocated for new object and copy of Unicode argument. * *--------------------------------------------------------------------------- */ Tcl_Obj * Tcl_NewUnicodeObj( const Tcl_UniChar *unicode, /* The unicode string used to initialize the * new object. */ int numChars) /* Number of characters in the unicode * string. */ { Tcl_Obj *objPtr; TclNewObj(objPtr); SetUnicodeObj(objPtr, unicode, numChars); return objPtr; } /* *---------------------------------------------------------------------- * * Tcl_GetCharLength -- * * Get the length of the Unicode string from the Tcl object. * * Results: * Pointer to Unicode string representing the Unicode object. * * Side effects: * Frees old internal rep. Allocates memory for new "String" internal * rep. * *---------------------------------------------------------------------- */ int Tcl_GetCharLength( Tcl_Obj *objPtr) /* The String object to get the num chars * of. */ { String *stringPtr; int numChars; /* * Quick, no-shimmer return for short string reps. */ if ((objPtr->bytes) && (objPtr->length < 2)) { /* 0 bytes -> 0 chars; 1 byte -> 1 char */ return objPtr->length; } /* * Optimize the case where we're really dealing with a ByteArray object; * we don't need to convert to a string to perform the get-length operation. * * NOTE that we do not need the ByteArray to be "pure". A ByteArray value * with a string rep cannot be trusted to represent the same value as the * string rep, but it *can* be trusted to have the same character length * as the string rep, which is all this routine cares about. */ if (objPtr->typePtr == &tclByteArrayType) { int length; (void) Tcl_GetByteArrayFromObj(objPtr, &length); return length; } /* * OK, need to work with the object as a string. */ SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); numChars = stringPtr->numChars; /* * If numChars is unknown, compute it. */ if (numChars == -1) { TclNumUtfChars(numChars, objPtr->bytes, objPtr->length); stringPtr->numChars = numChars; #if COMPAT if (numChars < objPtr->length) { /* * Since we've just computed the number of chars, and not all UTF * chars are 1-byte long, go ahead and populate the Unicode * string. */ FillUnicodeRep(objPtr); } #endif } return numChars; } /* *---------------------------------------------------------------------- * * TclCheckEmptyString -- * * Determine whether the string value of an object is or would be the * empty string, without generating a string representation. * * Results: * Returns 1 if empty, 0 if not, and -1 if unknown. * * Side effects: * None. * *---------------------------------------------------------------------- */ int TclCheckEmptyString ( Tcl_Obj *objPtr) { int length = -1; if (objPtr->bytes == tclEmptyStringRep) { return TCL_EMPTYSTRING_YES; } if (TclIsPureList(objPtr)) { TclListObjLength(NULL, objPtr, &length); return length == 0; } if (TclIsPureDict(objPtr)) { Tcl_DictObjSize(NULL, objPtr, &length); return length == 0; } if (objPtr->bytes == NULL) { return TCL_EMPTYSTRING_UNKNOWN; } return objPtr->length == 0; } /* *---------------------------------------------------------------------- * * Tcl_GetUniChar/TclGetUCS4 -- * * Get the index'th Unicode character from the String object. If index * is out of range, the result = 0xFFFD (Tcl_GetUniChar) resp. -1 (TclGetUCS4) * * Results: * Returns the index'th Unicode character in the Object. * * Side effects: * Fills unichar with the index'th Unicode character. * *---------------------------------------------------------------------- */ Tcl_UniChar Tcl_GetUniChar( Tcl_Obj *objPtr, /* The object to get the Unicode charater * from. */ int index) /* Get the index'th Unicode character. */ { String *stringPtr; int length; if (index < 0) { return 0xFFFD; } /* * Optimize the case where we're really dealing with a ByteArray object * we don't need to convert to a string to perform the indexing operation. */ if (TclIsPureByteArray(objPtr)) { unsigned char *bytes = Tcl_GetByteArrayFromObj(objPtr, &length); if (index >= length) { return 0xFFFD; } return (Tcl_UniChar) bytes[index]; } /* * OK, need to work with the object as a string. */ SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); if (stringPtr->hasUnicode == 0) { /* * If numChars is unknown, compute it. */ if (stringPtr->numChars == -1) { TclNumUtfChars(stringPtr->numChars, objPtr->bytes, objPtr->length); } if (stringPtr->numChars == objPtr->length) { return (unsigned char) objPtr->bytes[index]; } FillUnicodeRep(objPtr); stringPtr = GET_STRING(objPtr); } if (index >= stringPtr->numChars) { return 0xFFFD; } return stringPtr->unicode[index]; } #if TCL_UTF_MAX == 4 int TclGetUCS4( Tcl_Obj *objPtr, /* The object to get the Unicode character * from. */ int index) /* Get the index'th Unicode character. */ { String *stringPtr; int ch, length; if (index < 0) { return -1; } /* * Optimize the case where we're really dealing with a ByteArray object * we don't need to convert to a string to perform the indexing operation. */ if (TclIsPureByteArray(objPtr)) { unsigned char *bytes = Tcl_GetByteArrayFromObj(objPtr, &length); if (index >= length) { return -1; } return (int) bytes[index]; } /* * OK, need to work with the object as a string. */ SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); if (stringPtr->hasUnicode == 0) { /* * If numChars is unknown, compute it. */ if (stringPtr->numChars == -1) { TclNumUtfChars(stringPtr->numChars, objPtr->bytes, objPtr->length); } if (stringPtr->numChars == objPtr->length) { return (unsigned char) objPtr->bytes[index]; } FillUnicodeRep(objPtr); stringPtr = GET_STRING(objPtr); } if (index >= stringPtr->numChars) { return -1; } ch = stringPtr->unicode[index]; #if TCL_UTF_MAX <= 4 /* See: bug [11ae2be95dac9417] */ if ((ch & 0xF800) == 0xD800) { if (ch & 0x400) { if ((index > 0) && ((stringPtr->unicode[index-1] & 0xFC00) == 0xD800)) { ch = -1; /* low surrogate preceded by high surrogate */ } } else if ((++index < stringPtr->numChars) && ((stringPtr->unicode[index] & 0xFC00) == 0xDC00)) { /* high surrogate followed by low surrogate */ ch = (((ch & 0x3FF) << 10) | (stringPtr->unicode[index] & 0x3FF)) + 0x10000; } } #endif return ch; } #endif /* *---------------------------------------------------------------------- * * Tcl_GetUnicode -- * * Get the Unicode form of the String object. If the object is not * already a String object, it will be converted to one. If the String * object does not have a Unicode rep, then one is created from the UTF * string format. * * Results: * Returns a pointer to the object's internal Unicode string. * * Side effects: * Converts the object to have the String internal rep. * *---------------------------------------------------------------------- */ Tcl_UniChar * Tcl_GetUnicode( Tcl_Obj *objPtr) /* The object to find the Unicode string * for. */ { return Tcl_GetUnicodeFromObj(objPtr, NULL); } /* *---------------------------------------------------------------------- * * Tcl_GetUnicodeFromObj -- * * Get the Unicode form of the String object with length. If the object * is not already a String object, it will be converted to one. If the * String object does not have a Unicode rep, then one is create from the * UTF string format. * * Results: * Returns a pointer to the object's internal Unicode string. * * Side effects: * Converts the object to have the String internal rep. * *---------------------------------------------------------------------- */ Tcl_UniChar * Tcl_GetUnicodeFromObj( Tcl_Obj *objPtr, /* The object to find the Unicode string * for. */ int *lengthPtr) /* If non-NULL, the location where the string * rep's Tcl_UniChar length should be stored. If * NULL, no length is stored. */ { String *stringPtr; SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); if (stringPtr->hasUnicode == 0) { FillUnicodeRep(objPtr); stringPtr = GET_STRING(objPtr); } if (lengthPtr != NULL) { *lengthPtr = stringPtr->numChars; } return stringPtr->unicode; } /* *---------------------------------------------------------------------- * * Tcl_GetRange -- * * Create a Tcl Object that contains the chars between first and last of * the object indicated by "objPtr". If the object is not already a * String object, convert it to one. If first is negative, the returned * string start at the beginning of objPtr. If last is negative, the * returned string ends at the end of objPtr. * * Results: * Returns a new Tcl Object of the String type. * * Side effects: * Changes the internal rep of "objPtr" to the String type. * *---------------------------------------------------------------------- */ Tcl_Obj * Tcl_GetRange( Tcl_Obj *objPtr, /* The Tcl object to find the range of. */ int first, /* First index of the range. */ int last) /* Last index of the range. */ { Tcl_Obj *newObjPtr; /* The Tcl object to find the range of. */ String *stringPtr; int length; if (first < 0) { first = 0; } /* * Optimize the case where we're really dealing with a ByteArray object * we don't need to convert to a string to perform the substring operation. */ if (TclIsPureByteArray(objPtr)) { unsigned char *bytes = Tcl_GetByteArrayFromObj(objPtr, &length); if (last < 0 || last >= length) { last = length - 1; } if (last < first) { TclNewObj(newObjPtr); return newObjPtr; } return Tcl_NewByteArrayObj(bytes + first, last - first + 1); } /* * OK, need to work with the object as a string. */ SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); if (stringPtr->hasUnicode == 0) { /* * If numChars is unknown, compute it. */ if (stringPtr->numChars == -1) { TclNumUtfChars(stringPtr->numChars, objPtr->bytes, objPtr->length); } if (stringPtr->numChars == objPtr->length) { if (last < 0 || last >= stringPtr->numChars) { last = stringPtr->numChars - 1; } if (last < first) { TclNewObj(newObjPtr); return newObjPtr; } newObjPtr = Tcl_NewStringObj(objPtr->bytes + first, last - first + 1); /* * Since we know the char length of the result, store it. */ SetStringFromAny(NULL, newObjPtr); stringPtr = GET_STRING(newObjPtr); stringPtr->numChars = newObjPtr->length; return newObjPtr; } FillUnicodeRep(objPtr); stringPtr = GET_STRING(objPtr); } if (last < 0 || last >= stringPtr->numChars) { last = stringPtr->numChars - 1; } if (last < first) { TclNewObj(newObjPtr); return newObjPtr; } #if TCL_UTF_MAX == 4 /* See: bug [11ae2be95dac9417] */ if ((first > 0) && ((stringPtr->unicode[first] & 0xFC00) == 0xDC00) && ((stringPtr->unicode[first-1] & 0xFC00) == 0xD800)) { ++first; } if ((last + 1 < stringPtr->numChars) && ((stringPtr->unicode[last+1] & 0xFC00) == 0xDC00) && ((stringPtr->unicode[last] & 0xFC00) == 0xD800)) { ++last; } #endif return Tcl_NewUnicodeObj(stringPtr->unicode + first, last - first + 1); } /* *---------------------------------------------------------------------- * * Tcl_SetStringObj -- * * Modify an object to hold a string that is a copy of the bytes * indicated by the byte pointer and length arguments. * * Results: * None. * * Side effects: * The object's string representation will be set to a copy of the * "length" bytes starting at "bytes". If "length" is negative, use bytes * up to the first NUL byte; i.e., assume "bytes" points to a C-style * NUL-terminated string. The object's old string and internal * representations are freed and the object's type is set NULL. * *---------------------------------------------------------------------- */ void Tcl_SetStringObj( Tcl_Obj *objPtr, /* Object whose internal rep to init. */ const char *bytes, /* Points to the first of the length bytes * used to initialize the object. */ int length) /* The number of bytes to copy from "bytes" * when initializing the object. If negative, * use bytes up to the first NUL byte.*/ { if (Tcl_IsShared(objPtr)) { Tcl_Panic("%s called with shared object", "Tcl_SetStringObj"); } /* * Set the type to NULL and free any internal rep for the old type. */ TclFreeIntRep(objPtr); /* * Free any old string rep, then set the string rep to a copy of the * length bytes starting at "bytes". */ TclInvalidateStringRep(objPtr); if (length < 0) { length = (bytes? strlen(bytes) : 0); } TclInitStringRep(objPtr, bytes, length); } /* *---------------------------------------------------------------------- * * Tcl_SetObjLength -- * * This function changes the length of the string representation of an * object. * * Results: * None. * * Side effects: * If the size of objPtr's string representation is greater than length, * then it is reduced to length and a new terminating null byte is stored * in the strength. If the length of the string representation is greater * than length, the storage space is reallocated to the given length; a * null byte is stored at the end, but other bytes past the end of the * original string representation are undefined. The object's internal * representation is changed to "expendable string". * *---------------------------------------------------------------------- */ void Tcl_SetObjLength( Tcl_Obj *objPtr, /* Pointer to object. This object must not * currently be shared. */ int length) /* Number of bytes desired for string * representation of object, not including * terminating null byte. */ { String *stringPtr; if (length < 0) { /* * Setting to a negative length is nonsense. This is probably the * result of overflowing the signed integer range. */ Tcl_Panic("Tcl_SetObjLength: negative length requested: " "%d (integer overflow?)", length); } if (Tcl_IsShared(objPtr)) { Tcl_Panic("%s called with shared object", "Tcl_SetObjLength"); } if (objPtr->bytes && objPtr->length == length) { return; } SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); if (objPtr->bytes != NULL) { /* * Change length of an existing string rep. */ if (length > stringPtr->allocated) { /* * Need to enlarge the buffer. */ if (objPtr->bytes == tclEmptyStringRep) { objPtr->bytes = (char *)ckalloc((unsigned int)length + 1U); } else { objPtr->bytes = (char *)ckrealloc(objPtr->bytes, (unsigned int)length + 1U); } stringPtr->allocated = length; } objPtr->length = length; objPtr->bytes[length] = 0; /* * Invalidate the unicode data. */ stringPtr->numChars = -1; stringPtr->hasUnicode = 0; } else { /* * Changing length of pure unicode string. */ stringCheckLimits(length); if (length > stringPtr->maxChars) { stringPtr = stringRealloc(stringPtr, length); SET_STRING(objPtr, stringPtr); stringPtr->maxChars = length; } /* * Mark the new end of the Unicode string */ stringPtr->numChars = length; stringPtr->unicode[length] = 0; stringPtr->hasUnicode = 1; /* * Can only get here when objPtr->bytes == NULL. No need to invalidate * the string rep. */ } } /* *---------------------------------------------------------------------- * * Tcl_AttemptSetObjLength -- * * This function changes the length of the string representation of an * object. It uses the attempt* (non-panic'ing) memory allocators. * * Results: * 1 if the requested memory was allocated, 0 otherwise. * * Side effects: * If the size of objPtr's string representation is greater than length, * then it is reduced to length and a new terminating null byte is stored * in the strength. If the length of the string representation is greater * than length, the storage space is reallocated to the given length; a * null byte is stored at the end, but other bytes past the end of the * original string representation are undefined. The object's internal * representation is changed to "expendable string". * *---------------------------------------------------------------------- */ int Tcl_AttemptSetObjLength( Tcl_Obj *objPtr, /* Pointer to object. This object must not * currently be shared. */ int length) /* Number of bytes desired for string * representation of object, not including * terminating null byte. */ { String *stringPtr; if (length < 0) { /* * Setting to a negative length is nonsense. This is probably the * result of overflowing the signed integer range. */ return 0; } if (Tcl_IsShared(objPtr)) { Tcl_Panic("%s called with shared object", "Tcl_AttemptSetObjLength"); } if (objPtr->bytes && objPtr->length == length) { return 1; } SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); if (objPtr->bytes != NULL) { /* * Change length of an existing string rep. */ if (length > stringPtr->allocated) { /* * Need to enlarge the buffer. */ char *newBytes; if (objPtr->bytes == tclEmptyStringRep) { newBytes = (char *)attemptckalloc((unsigned int)length + 1U); } else { newBytes = (char *)attemptckrealloc(objPtr->bytes, (unsigned int)length + 1U); } if (newBytes == NULL) { return 0; } objPtr->bytes = newBytes; stringPtr->allocated = length; } objPtr->length = length; objPtr->bytes[length] = 0; /* * Invalidate the Unicode data. */ stringPtr->numChars = -1; stringPtr->hasUnicode = 0; } else { /* * Changing length of pure Unicode string. */ if (length > STRING_MAXCHARS) { return 0; } if (length > stringPtr->maxChars) { stringPtr = stringAttemptRealloc(stringPtr, length); if (stringPtr == NULL) { return 0; } SET_STRING(objPtr, stringPtr); stringPtr->maxChars = length; } /* * Mark the new end of the Unicode string. */ stringPtr->unicode[length] = 0; stringPtr->numChars = length; stringPtr->hasUnicode = 1; /* * Can only get here when objPtr->bytes == NULL. No need to invalidate * the string rep. */ } return 1; } /* *--------------------------------------------------------------------------- * * Tcl_SetUnicodeObj -- * * Modify an object to hold the Unicode string indicated by "unicode". * * Results: * None. * * Side effects: * Memory allocated for new "String" internal rep. * *--------------------------------------------------------------------------- */ void Tcl_SetUnicodeObj( Tcl_Obj *objPtr, /* The object to set the string of. */ const Tcl_UniChar *unicode, /* The Unicode string used to initialize the * object. */ int numChars) /* Number of characters in the Unicode * string. */ { if (Tcl_IsShared(objPtr)) { Tcl_Panic("%s called with shared object", "Tcl_SetUnicodeObj"); } TclFreeIntRep(objPtr); SetUnicodeObj(objPtr, unicode, numChars); } static int UnicodeLength( const Tcl_UniChar *unicode) { int numChars = 0; if (unicode) { while (numChars >= 0 && unicode[numChars] != 0) { numChars++; } } stringCheckLimits(numChars); return numChars; } static void SetUnicodeObj( Tcl_Obj *objPtr, /* The object to set the string of. */ const Tcl_UniChar *unicode, /* The Unicode string used to initialize the * object. */ int numChars) /* Number of characters in the Unicode * string. */ { String *stringPtr; if (numChars < 0) { numChars = UnicodeLength(unicode); } /* * Allocate enough space for the String structure + Unicode string. */ stringCheckLimits(numChars); stringPtr = stringAlloc(numChars); SET_STRING(objPtr, stringPtr); objPtr->typePtr = &tclStringType; stringPtr->maxChars = numChars; memcpy(stringPtr->unicode, unicode, numChars * sizeof(Tcl_UniChar)); stringPtr->unicode[numChars] = 0; stringPtr->numChars = numChars; stringPtr->hasUnicode = 1; TclInvalidateStringRep(objPtr); stringPtr->allocated = 0; } /* *---------------------------------------------------------------------- * * Tcl_AppendLimitedToObj -- * * This function appends a limited number of bytes from a sequence of * bytes to an object, marking any limitation with an ellipsis. * * Results: * None. * * Side effects: * The bytes at *bytes are appended to the string representation of * objPtr. * *---------------------------------------------------------------------- */ void Tcl_AppendLimitedToObj( Tcl_Obj *objPtr, /* Points to the object to append to. */ const char *bytes, /* Points to the bytes to append to the * object. */ int length, /* The number of bytes available to be * appended from "bytes". If < 0, then all * bytes up to a NUL byte are available. */ int limit, /* The maximum number of bytes to append to * the object. */ const char *ellipsis) /* Ellipsis marker string, appended to the * object to indicate not all available bytes * at "bytes" were appended. */ { String *stringPtr; int toCopy = 0; int eLen = 0; if (length < 0) { length = (bytes ? strlen(bytes) : 0); } if (length == 0) { return; } if (limit <= 0) { return; } if (length <= limit) { toCopy = length; } else { if (ellipsis == NULL) { ellipsis = "..."; } eLen = strlen(ellipsis); while (eLen > limit) { eLen = TclUtfPrev(ellipsis+eLen, ellipsis) - ellipsis; } toCopy = TclUtfPrev(bytes+limit+1-eLen, bytes) - bytes; } /* * If objPtr has a valid Unicode rep, then append the Unicode conversion * of "bytes" to the objPtr's Unicode rep, otherwise append "bytes" to * objPtr's string rep. */ if (Tcl_IsShared(objPtr)) { Tcl_Panic("%s called with shared object", "Tcl_AppendLimitedToObj"); } SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); if (stringPtr->hasUnicode && stringPtr->numChars > 0) { AppendUtfToUnicodeRep(objPtr, bytes, toCopy); } else { AppendUtfToUtfRep(objPtr, bytes, toCopy); } if (length <= limit) { return; } stringPtr = GET_STRING(objPtr); if (stringPtr->hasUnicode && stringPtr->numChars > 0) { AppendUtfToUnicodeRep(objPtr, ellipsis, eLen); } else { AppendUtfToUtfRep(objPtr, ellipsis, eLen); } } /* *---------------------------------------------------------------------- * * Tcl_AppendToObj -- * * This function appends a sequence of bytes to an object. * * Results: * None. * * Side effects: * The bytes at *bytes are appended to the string representation of * objPtr. * *---------------------------------------------------------------------- */ void Tcl_AppendToObj( Tcl_Obj *objPtr, /* Points to the object to append to. */ const char *bytes, /* Points to the bytes to append to the * object. */ int length) /* The number of bytes to append from "bytes". * If < 0, then append all bytes up to NUL * byte. */ { Tcl_AppendLimitedToObj(objPtr, bytes, length, INT_MAX, NULL); } /* *---------------------------------------------------------------------- * * Tcl_AppendUnicodeToObj -- * * This function appends a Unicode string to an object in the most * efficient manner possible. Length must be >= 0. * * Results: * None. * * Side effects: * Invalidates the string rep and creates a new Unicode string. * *---------------------------------------------------------------------- */ void Tcl_AppendUnicodeToObj( Tcl_Obj *objPtr, /* Points to the object to append to. */ const Tcl_UniChar *unicode, /* The Unicode string to append to the * object. */ int length) /* Number of chars in unicode. */ { String *stringPtr; if (Tcl_IsShared(objPtr)) { Tcl_Panic("%s called with shared object", "Tcl_AppendUnicodeToObj"); } if (length == 0) { return; } SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); /* * If objPtr has a valid Unicode rep, then append unicode to the * objPtr's Unicode rep, otherwise the UTF conversion of unicode to * objPtr's string rep. */ if (stringPtr->hasUnicode #if COMPAT && stringPtr->numChars > 0 #endif ) { AppendUnicodeToUnicodeRep(objPtr, unicode, length); } else { AppendUnicodeToUtfRep(objPtr, unicode, length); } } /* *---------------------------------------------------------------------- * * Tcl_AppendObjToObj -- * * This function appends the string rep of one object to another. * "objPtr" cannot be a shared object. * * Results: * None. * * Side effects: * The string rep of appendObjPtr is appended to the string * representation of objPtr. * IMPORTANT: This routine does not and MUST NOT shimmer appendObjPtr. * Callers are counting on that. * *---------------------------------------------------------------------- */ void Tcl_AppendObjToObj( Tcl_Obj *objPtr, /* Points to the object to append to. */ Tcl_Obj *appendObjPtr) /* Object to append. */ { String *stringPtr; int length, numChars, appendNumChars = -1; const char *bytes; /* * Special case: second object is standard-empty is fast case. We know * that appending nothing to anything leaves that starting anything... */ if (appendObjPtr->bytes == tclEmptyStringRep) { return; } /* * Handle append of one ByteArray object to another as a special case. * Note that we only do this when the objects don't have string reps; if * it did, then appending the byte arrays together could well lose * information; this is a special-case optimization only. */ if ((TclIsPureByteArray(objPtr) || objPtr->bytes == tclEmptyStringRep) && TclIsPureByteArray(appendObjPtr)) { /* * You might expect the code here to be * * bytes = Tcl_GetByteArrayFromObj(appendObjPtr, &length); * TclAppendBytesToByteArray(objPtr, bytes, length); * * and essentially all of the time that would be fine. However, it * would run into trouble in the case where objPtr and appendObjPtr * point to the same thing. That may never be a good idea. It seems to * violate Copy On Write, and we don't have any tests for the * situation, since making any Tcl commands that call * Tcl_AppendObjToObj() do that appears impossible (They honor Copy On * Write!). For the sake of extensions that go off into that realm, * though, here's a more complex approach that can handle all the * cases. * * First, get the lengths. */ int lengthSrc; (void) Tcl_GetByteArrayFromObj(objPtr, &length); (void) Tcl_GetByteArrayFromObj(appendObjPtr, &lengthSrc); /* * Grow buffer enough for the append. */ TclAppendBytesToByteArray(objPtr, NULL, lengthSrc); /* * Reset objPtr back to the original value. */ Tcl_SetByteArrayLength(objPtr, length); /* * Now do the append knowing that buffer growth cannot cause any * trouble. */ TclAppendBytesToByteArray(objPtr, Tcl_GetByteArrayFromObj(appendObjPtr, NULL), lengthSrc); return; } /* * Must append as strings. */ SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); /* * If objPtr has a valid Unicode rep, then get a Unicode string from * appendObjPtr and append it. */ if (stringPtr->hasUnicode #if COMPAT && stringPtr->numChars > 0 #endif ) { /* * If appendObjPtr is not of the "String" type, don't convert it. */ if (appendObjPtr->typePtr == &tclStringType) { Tcl_UniChar *unicode = Tcl_GetUnicodeFromObj(appendObjPtr, &numChars); AppendUnicodeToUnicodeRep(objPtr, unicode, numChars); } else { bytes = TclGetStringFromObj(appendObjPtr, &length); AppendUtfToUnicodeRep(objPtr, bytes, length); } return; } /* * Append to objPtr's UTF string rep. If we know the number of characters * in both objects before appending, then set the combined number of * characters in the final (appended-to) object. */ bytes = TclGetStringFromObj(appendObjPtr, &length); numChars = stringPtr->numChars; if ((numChars >= 0) && (appendObjPtr->typePtr == &tclStringType)) { String *appendStringPtr = GET_STRING(appendObjPtr); appendNumChars = appendStringPtr->numChars; } AppendUtfToUtfRep(objPtr, bytes, length); if (numChars >= 0 && appendNumChars >= 0 #if COMPAT && appendNumChars == length #endif ) { stringPtr->numChars = numChars + appendNumChars; } } /* *---------------------------------------------------------------------- * * AppendUnicodeToUnicodeRep -- * * Appends the contents of unicode to the Unicode rep of * objPtr, which must already have a valid Unicode rep. * * Results: * None. * * Side effects: * objPtr's internal rep is reallocated. * *---------------------------------------------------------------------- */ static void AppendUnicodeToUnicodeRep( Tcl_Obj *objPtr, /* Points to the object to append to. */ const Tcl_UniChar *unicode, /* String to append. */ int appendNumChars) /* Number of chars of "unicode" to append. */ { String *stringPtr; int numChars; if (appendNumChars < 0) { appendNumChars = UnicodeLength(unicode); } if (appendNumChars == 0) { return; } SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); /* * If not enough space has been allocated for the Unicode rep, reallocate * the internal rep object with additional space. First try to double the * required allocation; if that fails, try a more modest increase. See the * "TCL STRING GROWTH ALGORITHM" comment at the top of this file for an * explanation of this growth algorithm. */ numChars = stringPtr->numChars + appendNumChars; stringCheckLimits(numChars); if (numChars > stringPtr->maxChars) { int offset = -1; /* * Protect against case where Unicode points into the existing * stringPtr->unicode array. Force it to follow any relocations due to * the reallocs below. */ if (unicode && unicode >= stringPtr->unicode && unicode <= stringPtr->unicode + stringPtr->maxChars) { offset = unicode - stringPtr->unicode; } GrowUnicodeBuffer(objPtr, numChars); stringPtr = GET_STRING(objPtr); /* * Relocate Unicode if needed; see above. */ if (offset >= 0) { unicode = stringPtr->unicode + offset; } } /* * Copy the new string onto the end of the old string, then add the * trailing null. */ if (unicode) { memmove(stringPtr->unicode + stringPtr->numChars, unicode, appendNumChars * sizeof(Tcl_UniChar)); } stringPtr->unicode[numChars] = 0; stringPtr->numChars = numChars; stringPtr->allocated = 0; TclInvalidateStringRep(objPtr); } /* *---------------------------------------------------------------------- * * AppendUnicodeToUtfRep -- * * This function converts the contents of "unicode" to UTF and appends * the UTF to the string rep of "objPtr". * * Results: * None. * * Side effects: * objPtr's internal rep is reallocated. * *---------------------------------------------------------------------- */ static void AppendUnicodeToUtfRep( Tcl_Obj *objPtr, /* Points to the object to append to. */ const Tcl_UniChar *unicode, /* String to convert to UTF. */ int numChars) /* Number of chars of unicode to convert. */ { String *stringPtr = GET_STRING(objPtr); numChars = ExtendStringRepWithUnicode(objPtr, unicode, numChars); if (stringPtr->numChars != -1) { stringPtr->numChars += numChars; } #if COMPAT /* * Invalidate the Unicode rep. */ stringPtr->hasUnicode = 0; #endif } /* *---------------------------------------------------------------------- * * AppendUtfToUnicodeRep -- * * This function converts the contents of "bytes" to Unicode and appends * the Unicode to the Unicode rep of "objPtr". objPtr must already have a * valid Unicode rep. numBytes must be non-negative. * * Results: * None. * * Side effects: * objPtr's internal rep is reallocated. * *---------------------------------------------------------------------- */ static void AppendUtfToUnicodeRep( Tcl_Obj *objPtr, /* Points to the object to append to. */ const char *bytes, /* String to convert to Unicode. */ int numBytes) /* Number of bytes of "bytes" to convert. */ { String *stringPtr; if (numBytes == 0) { return; } ExtendUnicodeRepWithString(objPtr, bytes, numBytes, -1); TclInvalidateStringRep(objPtr); stringPtr = GET_STRING(objPtr); stringPtr->allocated = 0; } /* *---------------------------------------------------------------------- * * AppendUtfToUtfRep -- * * This function appends "numBytes" bytes of "bytes" to the UTF string * rep of "objPtr". objPtr must already have a valid String rep. * numBytes must be non-negative. * * Results: * None. * * Side effects: * objPtr's internal rep is reallocated. * *---------------------------------------------------------------------- */ static void AppendUtfToUtfRep( Tcl_Obj *objPtr, /* Points to the object to append to. */ const char *bytes, /* String to append. */ int numBytes) /* Number of bytes of "bytes" to append. */ { String *stringPtr; int newLength, oldLength; if (numBytes == 0) { return; } /* * Copy the new string onto the end of the old string, then add the * trailing null. */ if (objPtr->bytes == NULL) { objPtr->length = 0; } oldLength = objPtr->length; if (numBytes > INT_MAX - oldLength) { Tcl_Panic("max size for a Tcl value (%d bytes) exceeded", INT_MAX); } newLength = numBytes + oldLength; stringPtr = GET_STRING(objPtr); if (newLength > stringPtr->allocated) { int offset = -1; /* * Protect against case where unicode points into the existing * stringPtr->unicode array. Force it to follow any relocations due to * the reallocs below. */ if (bytes && objPtr->bytes && (bytes >= objPtr->bytes) && (bytes <= objPtr->bytes + objPtr->length)) { offset = bytes - objPtr->bytes; } /* * TODO: consider passing flag=1: no overalloc on first append. This * would make test stringObj-8.1 fail. */ GrowStringBuffer(objPtr, newLength, 0); /* * Relocate bytes if needed; see above. */ if (offset >= 0) { bytes = objPtr->bytes + offset; } } /* * Invalidate the unicode data. */ stringPtr->numChars = -1; stringPtr->hasUnicode = 0; if (bytes) { memmove(objPtr->bytes + oldLength, bytes, numBytes); } objPtr->bytes[newLength] = 0; objPtr->length = newLength; } /* *---------------------------------------------------------------------- * * Tcl_AppendStringsToObjVA -- * * This function appends one or more null-terminated strings to an * object. * * Results: * None. * * Side effects: * The contents of all the string arguments are appended to the string * representation of objPtr. * *---------------------------------------------------------------------- */ void Tcl_AppendStringsToObjVA( Tcl_Obj *objPtr, /* Points to the object to append to. */ va_list argList) /* Variable argument list. */ { if (Tcl_IsShared(objPtr)) { Tcl_Panic("%s called with shared object", "Tcl_AppendStringsToObj"); } while (1) { const char *bytes = va_arg(argList, char *); if (bytes == NULL) { break; } Tcl_AppendToObj(objPtr, bytes, -1); } } /* *---------------------------------------------------------------------- * * Tcl_AppendStringsToObj -- * * This function appends one or more null-terminated strings to an * object. * * Results: * None. * * Side effects: * The contents of all the string arguments are appended to the string * representation of objPtr. * *---------------------------------------------------------------------- */ void Tcl_AppendStringsToObj( Tcl_Obj *objPtr, ...) { va_list argList; va_start(argList, objPtr); Tcl_AppendStringsToObjVA(objPtr, argList); va_end(argList); } /* *---------------------------------------------------------------------- * * Tcl_AppendFormatToObj -- * * This function appends a list of Tcl_Obj's to a Tcl_Obj according to * the formatting instructions embedded in the format string. The * formatting instructions are inspired by sprintf(). Returns TCL_OK when * successful. If there's an error in the arguments, TCL_ERROR is * returned, and an error message is written to the interp, if non-NULL. * * Results: * A standard Tcl result. * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tcl_AppendFormatToObj( Tcl_Interp *interp, Tcl_Obj *appendObj, const char *format, int objc, Tcl_Obj *const objv[]) { const char *span = format, *msg, *errCode; int numBytes = 0, objIndex = 0, gotXpg = 0, gotSequential = 0; int originalLength, limit; Tcl_UniChar ch = 0; static const char *mixedXPG = "cannot mix \"%\" and \"%n$\" conversion specifiers"; static const char *const badIndex[2] = { "not enough arguments for all format specifiers", "\"%n$\" argument index out of range" }; static const char *overflow = "max size for a Tcl value exceeded"; if (Tcl_IsShared(appendObj)) { Tcl_Panic("%s called with shared object", "Tcl_AppendFormatToObj"); } TclGetStringFromObj(appendObj, &originalLength); limit = INT_MAX - originalLength; /* * Format string is NUL-terminated. */ while (*format != '\0') { char *end; int gotMinus = 0, gotHash = 0, gotZero = 0, gotSpace = 0, gotPlus = 0; int width, gotPrecision, precision, sawFlag, useShort = 0, useBig = 0; #ifndef TCL_WIDE_INT_IS_LONG int useWide = 0; #endif int newXpg, numChars, allocSegment = 0, segmentLimit, segmentNumBytes; Tcl_Obj *segment; int step = TclUtfToUniChar(format, &ch); format += step; if (ch != '%') { numBytes += step; continue; } if (numBytes) { if (numBytes > limit) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } Tcl_AppendToObj(appendObj, span, numBytes); limit -= numBytes; numBytes = 0; } /* * Saw a % : process the format specifier. * * Step 0. Handle special case of escaped format marker (i.e., %%). */ step = TclUtfToUniChar(format, &ch); if (ch == '%') { span = format; numBytes = step; format += step; continue; } /* * Step 1. XPG3 position specifier */ newXpg = 0; if (isdigit(UCHAR(ch))) { int position = strtoul(format, &end, 10); if (*end == '$') { newXpg = 1; objIndex = position - 1; format = end + 1; step = TclUtfToUniChar(format, &ch); } } if (newXpg) { if (gotSequential) { msg = mixedXPG; errCode = "MIXEDSPECTYPES"; goto errorMsg; } gotXpg = 1; } else { if (gotXpg) { msg = mixedXPG; errCode = "MIXEDSPECTYPES"; goto errorMsg; } gotSequential = 1; } if ((objIndex < 0) || (objIndex >= objc)) { msg = badIndex[gotXpg]; errCode = gotXpg ? "INDEXRANGE" : "FIELDVARMISMATCH"; goto errorMsg; } /* * Step 2. Set of flags. */ sawFlag = 1; do { switch (ch) { case '-': gotMinus = 1; break; case '#': gotHash = 1; break; case '0': gotZero = 1; break; case ' ': gotSpace = 1; break; case '+': gotPlus = 1; break; default: sawFlag = 0; } if (sawFlag) { format += step; step = TclUtfToUniChar(format, &ch); } } while (sawFlag); /* * Step 3. Minimum field width. */ width = 0; if (isdigit(UCHAR(ch))) { width = strtoul(format, &end, 10); if (width < 0) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } format = end; step = TclUtfToUniChar(format, &ch); } else if (ch == '*') { if (objIndex >= objc - 1) { msg = badIndex[gotXpg]; errCode = gotXpg ? "INDEXRANGE" : "FIELDVARMISMATCH"; goto errorMsg; } if (TclGetIntFromObj(interp, objv[objIndex], &width) != TCL_OK) { goto error; } if (width < 0) { width = -width; gotMinus = 1; } objIndex++; format += step; step = TclUtfToUniChar(format, &ch); } if (width > limit) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } /* * Step 4. Precision. */ gotPrecision = precision = 0; if (ch == '.') { gotPrecision = 1; format += step; step = TclUtfToUniChar(format, &ch); } if (isdigit(UCHAR(ch))) { precision = strtoul(format, &end, 10); format = end; step = TclUtfToUniChar(format, &ch); } else if (ch == '*') { if (objIndex >= objc - 1) { msg = badIndex[gotXpg]; errCode = gotXpg ? "INDEXRANGE" : "FIELDVARMISMATCH"; goto errorMsg; } if (TclGetIntFromObj(interp, objv[objIndex], &precision) != TCL_OK) { goto error; } /* * TODO: Check this truncation logic. */ if (precision < 0) { precision = 0; } objIndex++; format += step; step = TclUtfToUniChar(format, &ch); } /* * Step 5. Length modifier. */ if (ch == 'h') { useShort = 1; format += step; step = TclUtfToUniChar(format, &ch); } else if (ch == 'l') { format += step; step = TclUtfToUniChar(format, &ch); if (ch == 'l') { useBig = 1; format += step; step = TclUtfToUniChar(format, &ch); #ifndef TCL_WIDE_INT_IS_LONG } else { useWide = 1; #endif } } format += step; span = format; /* * Step 6. The actual conversion character. */ segment = objv[objIndex]; numChars = -1; if (ch == 'i') { ch = 'd'; } switch (ch) { case '\0': msg = "format string ended in middle of field specifier"; errCode = "INCOMPLETE"; goto errorMsg; case 's': if (gotPrecision) { numChars = Tcl_GetCharLength(segment); if (precision < numChars) { if (precision < 1) { TclNewObj(segment); } else { segment = Tcl_GetRange(segment, 0, precision - 1); } numChars = precision; Tcl_IncrRefCount(segment); allocSegment = 1; } } break; case 'c': { char buf[4] = ""; int code, length; if (TclGetIntFromObj(interp, segment, &code) != TCL_OK) { goto error; } length = Tcl_UniCharToUtf(code, buf); #if TCL_UTF_MAX > 3 if ((code >= 0xD800) && (length < 3)) { /* Special case for handling high surrogates. */ length += Tcl_UniCharToUtf(-1, buf + length); } #endif segment = Tcl_NewStringObj(buf, length); Tcl_IncrRefCount(segment); allocSegment = 1; break; } case 'u': if (useBig) { msg = "unsigned bignum format is invalid"; errCode = "BADUNSIGNED"; goto errorMsg; } /* FALLTHRU */ case 'd': case 'o': case 'x': case 'X': case 'b': { short s = 0; /* Silence compiler warning; only defined and * used when useShort is true. */ long l; Tcl_WideInt w; mp_int big; int toAppend, isNegative = 0; if (useBig) { if (Tcl_GetBignumFromObj(interp, segment, &big) != TCL_OK) { goto error; } isNegative = (mp_cmp_d(&big, 0) == MP_LT); #ifndef TCL_WIDE_INT_IS_LONG } else if (useWide) { if (Tcl_GetWideIntFromObj(NULL, segment, &w) != TCL_OK) { Tcl_Obj *objPtr; if (Tcl_GetBignumFromObj(interp,segment,&big) != TCL_OK) { goto error; } mp_mod_2d(&big, CHAR_BIT*sizeof(Tcl_WideInt), &big); objPtr = Tcl_NewBignumObj(&big); Tcl_IncrRefCount(objPtr); Tcl_GetWideIntFromObj(NULL, objPtr, &w); Tcl_DecrRefCount(objPtr); } isNegative = (w < (Tcl_WideInt) 0); #endif } else if (TclGetLongFromObj(NULL, segment, &l) != TCL_OK) { if (Tcl_GetWideIntFromObj(NULL, segment, &w) != TCL_OK) { Tcl_Obj *objPtr; if (Tcl_GetBignumFromObj(interp,segment,&big) != TCL_OK) { goto error; } mp_mod_2d(&big, CHAR_BIT * sizeof(long), &big); objPtr = Tcl_NewBignumObj(&big); Tcl_IncrRefCount(objPtr); TclGetLongFromObj(NULL, objPtr, &l); Tcl_DecrRefCount(objPtr); } else { l = Tcl_WideAsLong(w); } if (useShort) { s = (short) l; isNegative = (s < (short) 0); } else { isNegative = (l < (long) 0); } } else if (useShort) { s = (short) l; isNegative = (s < (short) 0); } else { isNegative = (l < (long) 0); } TclNewObj(segment); allocSegment = 1; segmentLimit = INT_MAX; Tcl_IncrRefCount(segment); if ((isNegative || gotPlus || gotSpace) && (useBig || ch=='d')) { Tcl_AppendToObj(segment, (isNegative ? "-" : gotPlus ? "+" : " "), 1); segmentLimit -= 1; } if (gotHash) { switch (ch) { case 'o': Tcl_AppendToObj(segment, "0", 1); segmentLimit -= 1; precision--; break; case 'X': Tcl_AppendToObj(segment, "0X", 2); segmentLimit -= 2; break; case 'x': Tcl_AppendToObj(segment, "0x", 2); segmentLimit -= 2; break; case 'b': Tcl_AppendToObj(segment, "0b", 2); segmentLimit -= 2; break; } } switch (ch) { case 'd': { int length; Tcl_Obj *pure; const char *bytes; if (useShort) { TclNewIntObj(pure, (int) s); #ifndef TCL_WIDE_INT_IS_LONG } else if (useWide) { pure = Tcl_NewWideIntObj(w); #endif } else if (useBig) { pure = Tcl_NewBignumObj(&big); } else { pure = Tcl_NewLongObj(l); } Tcl_IncrRefCount(pure); bytes = TclGetStringFromObj(pure, &length); /* * Already did the sign above. */ if (*bytes == '-') { length--; bytes++; } toAppend = length; /* * Canonical decimal string reps for integers are composed * entirely of one-byte encoded characters, so "length" is the * number of chars. */ if (gotPrecision) { if (length < precision) { segmentLimit -= precision - length; } while (length < precision) { Tcl_AppendToObj(segment, "0", 1); length++; } gotZero = 0; } if (gotZero) { length += Tcl_GetCharLength(segment); if (length < width) { segmentLimit -= width - length; } while (length < width) { Tcl_AppendToObj(segment, "0", 1); length++; } } if (toAppend > segmentLimit) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } Tcl_AppendToObj(segment, bytes, toAppend); Tcl_DecrRefCount(pure); break; } case 'u': case 'o': case 'x': case 'X': case 'b': { Tcl_WideUInt bits = (Tcl_WideUInt) 0; Tcl_WideInt numDigits = (Tcl_WideInt) 0; int length, numBits = 4, base = 16, index = 0, shift = 0; Tcl_Obj *pure; char *bytes; if (ch == 'u') { base = 10; } else if (ch == 'o') { base = 8; numBits = 3; } else if (ch == 'b') { base = 2; numBits = 1; } if (useShort) { unsigned short us = (unsigned short) s; bits = (Tcl_WideUInt) us; while (us) { numDigits++; us /= base; } #ifndef TCL_WIDE_INT_IS_LONG } else if (useWide) { Tcl_WideUInt uw = (Tcl_WideUInt) w; bits = uw; while (uw) { numDigits++; uw /= base; } #endif } else if (useBig && big.used) { int leftover = (big.used * MP_DIGIT_BIT) % numBits; mp_digit mask = (~(mp_digit)0) << (MP_DIGIT_BIT-leftover); numDigits = 1 + (((Tcl_WideInt) big.used * MP_DIGIT_BIT) / numBits); while ((mask & big.dp[big.used-1]) == 0) { numDigits--; mask >>= numBits; } if (numDigits > INT_MAX) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } } else if (!useBig) { unsigned long ul = (unsigned long) l; bits = (Tcl_WideUInt) ul; while (ul) { numDigits++; ul /= base; } } /* * Need to be sure zero becomes "0", not "". */ if ((numDigits == 0) && !((ch == 'o') && gotHash)) { numDigits = 1; } TclNewObj(pure); Tcl_SetObjLength(pure, (int) numDigits); bytes = TclGetString(pure); toAppend = length = (int) numDigits; while (numDigits--) { int digitOffset; if (useBig && big.used) { if (index < big.used && (size_t) shift < CHAR_BIT*sizeof(Tcl_WideUInt) - MP_DIGIT_BIT) { bits |= ((Tcl_WideUInt) big.dp[index++]) << shift; shift += MP_DIGIT_BIT; } shift -= numBits; } digitOffset = (int) (bits % base); if (digitOffset > 9) { if (ch == 'X') { bytes[numDigits] = 'A' + digitOffset - 10; } else { bytes[numDigits] = 'a' + digitOffset - 10; } } else { bytes[numDigits] = '0' + digitOffset; } bits /= base; } if (useBig) { mp_clear(&big); } if (gotPrecision) { if (length < precision) { segmentLimit -= precision - length; } while (length < precision) { Tcl_AppendToObj(segment, "0", 1); length++; } gotZero = 0; } if (gotZero) { length += Tcl_GetCharLength(segment); if (length < width) { segmentLimit -= width - length; } while (length < width) { Tcl_AppendToObj(segment, "0", 1); length++; } } if (toAppend > segmentLimit) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } Tcl_AppendObjToObj(segment, pure); Tcl_DecrRefCount(pure); break; } } break; } case 'e': case 'E': case 'f': case 'g': case 'G': { #define MAX_FLOAT_SIZE 320 char spec[2*TCL_INTEGER_SPACE + 9], *p = spec; double d; int length = MAX_FLOAT_SIZE; char *bytes; if (Tcl_GetDoubleFromObj(interp, segment, &d) != TCL_OK) { /* TODO: Figure out ACCEPT_NAN here */ goto error; } *p++ = '%'; if (gotMinus) { *p++ = '-'; } if (gotHash) { *p++ = '#'; } if (gotZero) { *p++ = '0'; } if (gotSpace) { *p++ = ' '; } if (gotPlus) { *p++ = '+'; } if (width) { p += snprintf(p, TCL_INTEGER_SPACE, "%d", width); if (width > length) { length = width; } } if (gotPrecision) { *p++ = '.'; p += snprintf(p, TCL_INTEGER_SPACE, "%d", precision); if (precision > INT_MAX - length) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } length += precision; } /* * Don't pass length modifiers! */ *p++ = (char) ch; *p = '\0'; TclNewObj(segment); allocSegment = 1; if (!Tcl_AttemptSetObjLength(segment, length)) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } bytes = TclGetString(segment); if (!Tcl_AttemptSetObjLength(segment, snprintf(bytes, segment->length, spec, d))) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } break; } default: if (interp != NULL) { Tcl_SetObjResult(interp, Tcl_ObjPrintf("bad field specifier \"%c\"", ch)); Tcl_SetErrorCode(interp, "TCL", "FORMAT", "BADTYPE", NULL); } goto error; } if (width>0 && numChars<0) { numChars = Tcl_GetCharLength(segment); } if (!gotMinus && width>0) { if (numChars < width) { limit -= width - numChars; } while (numChars < width) { Tcl_AppendToObj(appendObj, (gotZero ? "0" : " "), 1); numChars++; } } TclGetStringFromObj(segment, &segmentNumBytes); if (segmentNumBytes > limit) { if (allocSegment) { Tcl_DecrRefCount(segment); } msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } Tcl_AppendObjToObj(appendObj, segment); limit -= segmentNumBytes; if (allocSegment) { Tcl_DecrRefCount(segment); } if (width > 0) { if (numChars < width) { limit -= width-numChars; } while (numChars < width) { Tcl_AppendToObj(appendObj, (gotZero ? "0" : " "), 1); numChars++; } } objIndex += gotSequential; } if (numBytes) { if (numBytes > limit) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } Tcl_AppendToObj(appendObj, span, numBytes); limit -= numBytes; numBytes = 0; } return TCL_OK; errorMsg: if (interp != NULL) { Tcl_SetObjResult(interp, Tcl_NewStringObj(msg, -1)); Tcl_SetErrorCode(interp, "TCL", "FORMAT", errCode, NULL); } error: Tcl_SetObjLength(appendObj, originalLength); return TCL_ERROR; } /* *--------------------------------------------------------------------------- * * Tcl_Format -- * * Results: * A refcount zero Tcl_Obj. * * Side effects: * None. * *--------------------------------------------------------------------------- */ Tcl_Obj * Tcl_Format( Tcl_Interp *interp, const char *format, int objc, Tcl_Obj *const objv[]) { int result; Tcl_Obj *objPtr; TclNewObj(objPtr); result = Tcl_AppendFormatToObj(interp, objPtr, format, objc, objv); if (result != TCL_OK) { Tcl_DecrRefCount(objPtr); return NULL; } return objPtr; } /* *--------------------------------------------------------------------------- * * AppendPrintfToObjVA -- * * Results: * * Side effects: * *--------------------------------------------------------------------------- */ static void AppendPrintfToObjVA( Tcl_Obj *objPtr, const char *format, va_list argList) { int code, objc; Tcl_Obj **objv, *list; const char *p; TclNewObj(list); p = format; Tcl_IncrRefCount(list); while (*p != '\0') { int size = 0, seekingConversion = 1, gotPrecision = 0; int lastNum = -1; if (*p++ != '%') { continue; } if (*p == '%') { p++; continue; } do { switch (*p) { case '\0': seekingConversion = 0; break; case 's': { const char *q, *end, *bytes = va_arg(argList, char *); seekingConversion = 0; /* * The buffer to copy characters from starts at bytes and ends * at either the first NUL byte, or after lastNum bytes, when * caller has indicated a limit. */ end = bytes; while ((!gotPrecision || lastNum--) && (*end != '\0')) { end++; } /* * Within that buffer, we trim both ends if needed so that we * copy only whole characters, and avoid copying any partial * multi-byte characters. */ q = TclUtfPrev(end, bytes); if (!Tcl_UtfCharComplete(q, (int)(end - q))) { end = q; } q = bytes + TCL_UTF_MAX; while ((bytes < end) && (bytes < q) && ((*bytes & 0xC0) == 0x80)) { bytes++; } Tcl_ListObjAppendElement(NULL, list, Tcl_NewStringObj(bytes , (int)(end - bytes))); break; } case 'c': case 'i': case 'u': case 'd': case 'o': case 'x': case 'X': seekingConversion = 0; switch (size) { case -1: case 0: Tcl_ListObjAppendElement(NULL, list, Tcl_NewLongObj( (long) va_arg(argList, int))); break; case 1: Tcl_ListObjAppendElement(NULL, list, Tcl_NewLongObj( va_arg(argList, long))); break; } break; case 'e': case 'E': case 'f': case 'g': case 'G': Tcl_ListObjAppendElement(NULL, list, Tcl_NewDoubleObj( va_arg(argList, double))); seekingConversion = 0; break; case '*': lastNum = (int) va_arg(argList, int); Tcl_ListObjAppendElement(NULL, list, Tcl_NewIntObj(lastNum)); p++; break; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': { char *end; lastNum = (int) strtoul(p, &end, 10); p = end; break; } case '.': gotPrecision = 1; p++; break; /* TODO: support for wide (and bignum?) arguments */ case 'l': size = 1; p++; break; case 'h': size = -1; /* FALLTHRU */ default: p++; } } while (seekingConversion); } TclListObjGetElements(NULL, list, &objc, &objv); code = Tcl_AppendFormatToObj(NULL, objPtr, format, objc, objv); if (code != TCL_OK) { Tcl_AppendPrintfToObj(objPtr, "Unable to format \"%s\" with supplied arguments: %s", format, Tcl_GetString(list)); } Tcl_DecrRefCount(list); } /* *--------------------------------------------------------------------------- * * Tcl_AppendPrintfToObj -- * * Results: * A standard Tcl result. * * Side effects: * None. * *--------------------------------------------------------------------------- */ void Tcl_AppendPrintfToObj( Tcl_Obj *objPtr, const char *format, ...) { va_list argList; va_start(argList, format); AppendPrintfToObjVA(objPtr, format, argList); va_end(argList); } /* *--------------------------------------------------------------------------- * * Tcl_ObjPrintf -- * * Results: * A refcount zero Tcl_Obj. * * Side effects: * None. * *--------------------------------------------------------------------------- */ Tcl_Obj * Tcl_ObjPrintf( const char *format, ...) { va_list argList; Tcl_Obj *objPtr; TclNewObj(objPtr); va_start(argList, format); AppendPrintfToObjVA(objPtr, format, argList); va_end(argList); return objPtr; } /* *--------------------------------------------------------------------------- * * TclGetStringStorage -- * * Returns the string storage space of a Tcl_Obj. * * Results: * The pointer value objPtr->bytes is returned and the number of bytes * allocated there is written to *sizePtr (if known). * * Side effects: * May set objPtr->bytes. * *--------------------------------------------------------------------------- */ char * TclGetStringStorage( Tcl_Obj *objPtr, unsigned int *sizePtr) { String *stringPtr; if (objPtr->typePtr != &tclStringType || objPtr->bytes == NULL) { return TclGetStringFromObj(objPtr, (int *)sizePtr); } stringPtr = GET_STRING(objPtr); *sizePtr = stringPtr->allocated; return objPtr->bytes; } /* *--------------------------------------------------------------------------- * * TclStringReverse -- * * Implements the [string reverse] operation. * * Results: * An unshared Tcl value which is the [string reverse] of the argument * supplied. When sharing rules permit, the returned value might be the * argument with modifications done in place. * * Side effects: * May allocate a new Tcl_Obj. * *--------------------------------------------------------------------------- */ static void ReverseBytes( unsigned char *to, /* Copy bytes into here... */ unsigned char *from, /* ...from here... */ int count) /* Until this many are copied, */ /* reversing as you go. */ { unsigned char *src = from + count; if (to == from) { /* Reversing in place */ while (--src > to) { unsigned char c = *src; *src = *to; *to++ = c; } } else { while (--src >= from) { *to++ = *src; } } } Tcl_Obj * TclStringReverse( Tcl_Obj *objPtr) { String *stringPtr; Tcl_UniChar ch = 0; #if TCL_UTF_MAX <= 4 int needFlip = 0; #endif if (TclIsPureByteArray(objPtr)) { int numBytes; unsigned char *from = Tcl_GetByteArrayFromObj(objPtr, &numBytes); if (Tcl_IsShared(objPtr)) { objPtr = Tcl_NewByteArrayObj(NULL, numBytes); } ReverseBytes(Tcl_GetByteArrayFromObj(objPtr, NULL), from, numBytes); return objPtr; } SetStringFromAny(NULL, objPtr); stringPtr = GET_STRING(objPtr); if (stringPtr->hasUnicode) { Tcl_UniChar *from = Tcl_GetUnicode(objPtr); Tcl_UniChar *src = from + stringPtr->numChars; Tcl_UniChar *to; if (Tcl_IsShared(objPtr)) { /* * Create a non-empty, pure Unicode value, so we can coax * Tcl_SetObjLength into growing the Unicode rep buffer. */ objPtr = Tcl_NewUnicodeObj(&ch, 1); Tcl_SetObjLength(objPtr, stringPtr->numChars); to = Tcl_GetUnicode(objPtr); while (--src >= from) { #if TCL_UTF_MAX <= 4 ch = *src; if ((ch & 0xF800) == 0xD800) { needFlip = 1; } *to++ = ch; #else *to++ = *src; #endif } } else { /* * Reversing in place. */ #if TCL_UTF_MAX <= 4 to = src; #endif while (--src > from) { ch = *src; #if TCL_UTF_MAX <= 4 if ((ch & 0xF800) == 0xD800) { needFlip = 1; } #endif *src = *from; *from++ = ch; } } #if TCL_UTF_MAX <= 4 if (needFlip) { /* * Flip back surrogate pairs. */ from = to - stringPtr->numChars; while (--to >= from) { ch = *to; if ((ch & 0xFC00) == 0xD800) { if ((to-1 >= from) && ((to[-1] & 0xFC00) == 0xDC00)) { to[0] = to[-1]; to[-1] = ch; --to; } } } } #endif } if (objPtr->bytes) { int numChars = stringPtr->numChars; int numBytes = objPtr->length; char *to, *from = objPtr->bytes; if (Tcl_IsShared(objPtr)) { TclNewObj(objPtr); Tcl_SetObjLength(objPtr, numBytes); } to = objPtr->bytes; if (numChars < numBytes) { /* * Either numChars == -1 and we don't know how many chars are * represented by objPtr->bytes and we need Pass 1 just in case, * or numChars >= 0 and we know we have fewer chars than bytes, so * we know there's a multibyte character needing Pass 1. * * Pass 1. Reverse the bytes of each multi-byte character. */ int bytesLeft = numBytes; int chw; while (bytesLeft) { /* * NOTE: We know that the from buffer is NUL-terminated. It's * part of the contract for objPtr->bytes values. Thus, we can * skip calling Tcl_UtfCharComplete() here. */ int bytesInChar = TclUtfToUCS4(from, &chw); ReverseBytes((unsigned char *)to, (unsigned char *)from, bytesInChar); to += bytesInChar; from += bytesInChar; bytesLeft -= bytesInChar; } from = to = objPtr->bytes; } /* Pass 2. Reverse all the bytes. */ ReverseBytes((unsigned char *)to, (unsigned char *)from, numBytes); } return objPtr; } /* *--------------------------------------------------------------------------- * * FillUnicodeRep -- * * Populate the Unicode internal rep with the Unicode form of its string * rep. The object must already have a "String" internal rep. * * Results: * None. * * Side effects: * Reallocates the String internal rep. * *--------------------------------------------------------------------------- */ static void FillUnicodeRep( Tcl_Obj *objPtr) /* The object in which to fill the unicode * rep. */ { String *stringPtr = GET_STRING(objPtr); ExtendUnicodeRepWithString(objPtr, objPtr->bytes, objPtr->length, stringPtr->numChars); } static void ExtendUnicodeRepWithString( Tcl_Obj *objPtr, const char *bytes, int numBytes, int numAppendChars) { String *stringPtr = GET_STRING(objPtr); int needed, numOrigChars = 0; Tcl_UniChar *dst, unichar = 0; if (stringPtr->hasUnicode) { numOrigChars = stringPtr->numChars; } if (numAppendChars == -1) { TclNumUtfChars(numAppendChars, bytes, numBytes); } needed = numOrigChars + numAppendChars; stringCheckLimits(needed); if (needed > stringPtr->maxChars) { GrowUnicodeBuffer(objPtr, needed); stringPtr = GET_STRING(objPtr); } stringPtr->hasUnicode = 1; if (bytes) { stringPtr->numChars = needed; } else { numAppendChars = 0; } for (dst=stringPtr->unicode + numOrigChars; numAppendChars-- > 0; dst++) { bytes += TclUtfToUniChar(bytes, &unichar); *dst = unichar; } *dst = 0; } /* *---------------------------------------------------------------------- * * DupStringInternalRep -- * * Initialize the internal representation of a new Tcl_Obj to a copy of * the internal representation of an existing string object. * * Results: * None. * * Side effects: * copyPtr's internal rep is set to a copy of srcPtr's internal * representation. * *---------------------------------------------------------------------- */ static void DupStringInternalRep( Tcl_Obj *srcPtr, /* Object with internal rep to copy. Must have * an internal rep of type "String". */ Tcl_Obj *copyPtr) /* Object with internal rep to set. Must not * currently have an internal rep.*/ { String *srcStringPtr = GET_STRING(srcPtr); String *copyStringPtr = NULL; #if COMPAT==0 if (srcStringPtr->numChars == -1) { /* * The String struct in the source value holds zero useful data. Don't * bother copying it. Don't even bother allocating space in which to * copy it. Just let the copy be untyped. */ return; } if (srcStringPtr->hasUnicode) { int copyMaxChars; if (srcStringPtr->maxChars / 2 >= srcStringPtr->numChars) { copyMaxChars = 2 * srcStringPtr->numChars; } else { copyMaxChars = srcStringPtr->maxChars; } copyStringPtr = stringAttemptAlloc(copyMaxChars); if (copyStringPtr == NULL) { copyMaxChars = srcStringPtr->numChars; copyStringPtr = stringAlloc(copyMaxChars); } copyStringPtr->maxChars = copyMaxChars; memcpy(copyStringPtr->unicode, srcStringPtr->unicode, srcStringPtr->numChars * sizeof(Tcl_UniChar)); copyStringPtr->unicode[srcStringPtr->numChars] = 0; } else { copyStringPtr = stringAlloc(0); copyStringPtr->maxChars = 0; copyStringPtr->unicode[0] = 0; } copyStringPtr->hasUnicode = srcStringPtr->hasUnicode; copyStringPtr->numChars = srcStringPtr->numChars; /* * Tricky point: the string value was copied by generic object management * code, so it doesn't contain any extra bytes that might exist in the * source object. */ copyStringPtr->allocated = copyPtr->bytes ? copyPtr->length : 0; #else /* COMPAT!=0 */ /* * If the src obj is a string of 1-byte Utf chars, then copy the string * rep of the source object and create an "empty" Unicode internal rep for * the new object. Otherwise, copy Unicode internal rep, and invalidate * the string rep of the new object. */ if (srcStringPtr->hasUnicode && srcStringPtr->numChars > 0) { /* * Copy the full allocation for the Unicode buffer. */ copyStringPtr = stringAlloc(srcStringPtr->maxChars); copyStringPtr->maxChars = srcStringPtr->maxChars; memcpy(copyStringPtr->unicode, srcStringPtr->unicode, srcStringPtr->numChars * sizeof(Tcl_UniChar)); copyStringPtr->unicode[srcStringPtr->numChars] = 0; copyStringPtr->allocated = 0; } else { copyStringPtr = stringAlloc(0); copyStringPtr->unicode[0] = 0; copyStringPtr->maxChars = 0; /* * Tricky point: the string value was copied by generic object * management code, so it doesn't contain any extra bytes that might * exist in the source object. */ copyStringPtr->allocated = copyPtr->length; } copyStringPtr->numChars = srcStringPtr->numChars; copyStringPtr->hasUnicode = srcStringPtr->hasUnicode; #endif /* COMPAT==0 */ SET_STRING(copyPtr, copyStringPtr); copyPtr->typePtr = &tclStringType; } /* *---------------------------------------------------------------------- * * SetStringFromAny -- * * Create an internal representation of type "String" for an object. * * Results: * This operation always succeeds and returns TCL_OK. * * Side effects: * Any old internal representation for objPtr is freed and the internal * representation is set to "String". * *---------------------------------------------------------------------- */ static int SetStringFromAny( Tcl_Interp *interp, /* Used for error reporting if not NULL. */ Tcl_Obj *objPtr) /* The object to convert. */ { if (objPtr->typePtr != &tclStringType) { String *stringPtr = stringAlloc(0); /* * Convert whatever we have into an untyped value. Just A String. */ (void) TclGetString(objPtr); TclFreeIntRep(objPtr); /* * Create a basic String internalrep that just points to the UTF-8 string * already in place at objPtr->bytes. */ stringPtr->numChars = -1; stringPtr->allocated = objPtr->length; stringPtr->maxChars = 0; stringPtr->hasUnicode = 0; SET_STRING(objPtr, stringPtr); objPtr->typePtr = &tclStringType; } return TCL_OK; } /* *---------------------------------------------------------------------- * * UpdateStringOfString -- * * Update the string representation for an object whose internal * representation is "String". * * Results: * None. * * Side effects: * The object's string may be set by converting its Unicode representation * to UTF format. * *---------------------------------------------------------------------- */ static void UpdateStringOfString( Tcl_Obj *objPtr) /* Object with string rep to update. */ { String *stringPtr = GET_STRING(objPtr); /* * This routine is only called when we need to generate the * string rep objPtr->bytes because it does not exist -- it is NULL. * In that circumstance, any lingering claim about the size of * memory pointed to by that NULL pointer is clearly bogus, and * needs a reset. */ stringPtr->allocated = 0; if (stringPtr->numChars == 0) { TclInitStringRep(objPtr, tclEmptyStringRep, 0); } else { (void) ExtendStringRepWithUnicode(objPtr, stringPtr->unicode, stringPtr->numChars); } } static int ExtendStringRepWithUnicode( Tcl_Obj *objPtr, const Tcl_UniChar *unicode, int numChars) { /* * Precondition: this is the "string" Tcl_ObjType. */ int i, origLength, size = 0; char *dst, buf[4] = ""; String *stringPtr = GET_STRING(objPtr); if (numChars < 0) { numChars = UnicodeLength(unicode); } if (numChars == 0) { return 0; } if (objPtr->bytes == NULL) { objPtr->length = 0; } size = origLength = objPtr->length; /* * Quick cheap check in case we have more than enough room. */ if (numChars <= (INT_MAX - size)/TCL_UTF_MAX && stringPtr->allocated >= size + numChars * TCL_UTF_MAX) { goto copyBytes; } for (i = 0; i < numChars && size >= 0; i++) { size += (unsigned int)Tcl_UniCharToUtf((int) unicode[i], buf); } if (size < 0) { Tcl_Panic("max size for a Tcl value (%d bytes) exceeded", INT_MAX); } /* * Grow space if needed. */ if (size > stringPtr->allocated) { GrowStringBuffer(objPtr, size, 1); } copyBytes: dst = objPtr->bytes + origLength; for (i = 0; i < numChars; i++) { dst += Tcl_UniCharToUtf(unicode[i], dst); } *dst = '\0'; objPtr->length = dst - objPtr->bytes; return numChars; } /* *---------------------------------------------------------------------- * * FreeStringInternalRep -- * * Deallocate the storage associated with a String data object's internal * representation. * * Results: * None. * * Side effects: * Frees memory. * *---------------------------------------------------------------------- */ static void FreeStringInternalRep( Tcl_Obj *objPtr) /* Object with internal rep to free. */ { ckfree(GET_STRING(objPtr)); objPtr->typePtr = NULL; } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */