/* * 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" /* * 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) { /* * Pre-conditions: * 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) { attempt = 2 * needed; if (attempt >= 0) { ptr = attemptckrealloc(objPtr->bytes, attempt + 1); } 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 = attemptckrealloc(objPtr->bytes, attempt + 1); } } if (ptr == NULL) { /* * First allocation - just big enough; or last chance fallback. */ attempt = needed; ptr = ckrealloc(objPtr->bytes, attempt + 1); } objPtr->bytes = ptr; stringPtr->allocated = attempt; } static void GrowUnicodeBuffer( Tcl_Obj *objPtr, int needed) { /* * Pre-conditions: * 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. */ attempt = 2 * needed; if (attempt >= 0 && attempt <= STRING_MAXCHARS) { 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 * without string representation; we don't need to convert to a string to * perform the get-length operation. */ if (TclIsPureByteArray(objPtr)) { 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; } return numChars; } /* *---------------------------------------------------------------------- * * Tcl_GetUniChar -- * * Get the index'th Unicode character from the String object. The index * is assumed to be in the appropriate range. * * 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; /* * Optimize the case where we're really dealing with a bytearray object * without string representation; we don't need to convert to a string to * perform the indexing operation. */ if (TclIsPureByteArray(objPtr)) { unsigned char *bytes = Tcl_GetByteArrayFromObj(objPtr, NULL); 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 (Tcl_UniChar) objPtr->bytes[index]; } FillUnicodeRep(objPtr); stringPtr = GET_STRING(objPtr); } return stringPtr->unicode[index]; } /* *---------------------------------------------------------------------- * * 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 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_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 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. The first and last indices are * assumed to be in the appropriate range. * * 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; /* * Optimize the case where we're really dealing with a bytearray object * without string representation; we don't need to convert to a string to * perform the substring operation. */ if (TclIsPureByteArray(objPtr)) { unsigned char *bytes = Tcl_GetByteArrayFromObj(objPtr, NULL); 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) { 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); } 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 = ckalloc(length + 1); } else { objPtr->bytes = ckrealloc(objPtr->bytes, length + 1); } 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 = attemptckalloc(length + 1); } else { newBytes = attemptckrealloc(objPtr->bytes, length + 1); } 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; if (Tcl_IsShared(objPtr)) { Tcl_Panic("%s called with shared object", "Tcl_AppendLimitedToObj"); } if (length < 0) { length = (bytes ? strlen(bytes) : 0); } if (length == 0) { return; } if (length <= limit) { toCopy = length; } else { if (ellipsis == NULL) { ellipsis = "..."; } toCopy = (bytes == NULL) ? limit : Tcl_UtfPrev(bytes+limit+1-strlen(ellipsis), 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. */ 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, strlen(ellipsis)); } else { AppendUtfToUtfRep(objPtr, ellipsis, strlen(ellipsis)); } } /* *---------------------------------------------------------------------- * * 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 the "unicode" to the * objPtr's Unicode rep, otherwise the UTF conversion of "unicode" to * objPtr's string rep. */ if (stringPtr->hasUnicode) { 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. */ /* Get 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 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) { stringPtr->numChars = numChars + appendNumChars; } } /* *---------------------------------------------------------------------- * * AppendUnicodeToUnicodeRep -- * * This function appends the contents of "unicode" to the Unicode rep of * "objPtr". objPtr 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; } } /* *---------------------------------------------------------------------- * * 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; newLength = numBytes + oldLength; if (newLength < 0) { Tcl_Panic("max size for a Tcl value (%d bytes) exceeded", INT_MAX); } 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 && 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; 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, gotHash, gotZero, gotSpace, gotPlus, sawFlag; int width, gotPrecision, precision, useShort, useWide, useBig; int newXpg, numChars, allocSegment = 0, segmentLimit, segmentNumBytes; Tcl_Obj *segment; Tcl_UniChar ch; int step = Tcl_UtfToUniChar(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 = Tcl_UtfToUniChar(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 = Tcl_UtfToUniChar(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. */ gotMinus = gotHash = gotZero = gotSpace = gotPlus = 0; 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 = Tcl_UtfToUniChar(format, &ch); } } while (sawFlag); /* * Step 3. Minimum field width. */ width = 0; if (isdigit(UCHAR(ch))) { width = strtoul(format, &end, 10); format = end; step = Tcl_UtfToUniChar(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 = Tcl_UtfToUniChar(format, &ch); } if (width > limit) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } /* * Step 4. Precision. */ gotPrecision = precision = 0; if (ch == '.') { gotPrecision = 1; format += step; step = Tcl_UtfToUniChar(format, &ch); } if (isdigit(UCHAR(ch))) { precision = strtoul(format, &end, 10); format = end; step = Tcl_UtfToUniChar(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 = Tcl_UtfToUniChar(format, &ch); } /* * Step 5. Length modifier. */ useShort = useWide = useBig = 0; if (ch == 'h') { useShort = 1; format += step; step = Tcl_UtfToUniChar(format, &ch); } else if (ch == 'l') { format += step; step = Tcl_UtfToUniChar(format, &ch); if (ch == 'l') { useBig = 1; format += step; step = Tcl_UtfToUniChar(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) { segment = Tcl_GetRange(segment, 0, precision - 1); numChars = precision; Tcl_IncrRefCount(segment); allocSegment = 1; } } break; case 'c': { char buf[TCL_UTF_MAX]; int code, length; if (TclGetIntFromObj(interp, segment, &code) != TCL_OK) { goto error; } length = Tcl_UniCharToUtf(code, buf); 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; } 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); } 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, (int) 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); } 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, (int) 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); } segment = Tcl_NewObj(); 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': 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) { pure = Tcl_NewIntObj((int) s); } else if (useWide) { pure = Tcl_NewWideIntObj(w); } 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; } } else if (useWide) { Tcl_WideUInt uw = (Tcl_WideUInt) w; bits = uw; while (uw) { numDigits++; uw /= base; } } else if (useBig && big.used) { int leftover = (big.used * DIGIT_BIT) % numBits; mp_digit mask = (~(mp_digit)0) << (DIGIT_BIT-leftover); numDigits = 1 + (((Tcl_WideInt) big.used * 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; } pure = Tcl_NewObj(); 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) - DIGIT_BIT) { bits |= ((Tcl_WideUInt) big.dp[index++]) << shift; shift += DIGIT_BIT; } shift -= numBits; } digitOffset = (int) (bits % base); if (digitOffset > 9) { 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 += sprintf(p, "%d", width); if (width > length) { length = width; } } if (gotPrecision) { *p++ = '.'; p += sprintf(p, "%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'; segment = Tcl_NewObj(); allocSegment = 1; if (!Tcl_AttemptSetObjLength(segment, length)) { msg = overflow; errCode = "OVERFLOW"; goto errorMsg; } bytes = TclGetString(segment); if (!Tcl_AttemptSetObjLength(segment, sprintf(bytes, 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; } switch (ch) { case 'E': case 'G': case 'X': { Tcl_SetObjLength(segment, Tcl_UtfToUpper(TclGetString(segment))); } } 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 = Tcl_NewObj(); 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 = Tcl_NewObj(); const char *p; 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 = Tcl_UtfPrev(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; 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 = Tcl_NewObj(); 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; } /* *--------------------------------------------------------------------------- * * TclStringCatObjv -- * * Performs the [string cat] function. * * Results: * A standard Tcl result. * * Side effects: * Writes to *objPtrPtr the address of Tcl_Obj that is concatenation * of all objc values in objv. * *--------------------------------------------------------------------------- */ int TclStringCatObjv( Tcl_Interp *interp, int inPlace, int objc, Tcl_Obj * const objv[], Tcl_Obj **objPtrPtr) { Tcl_Obj *objPtr, *objResultPtr, * const *ov; int oc, length = 0, binary = 1, first = 0; int allowUniChar = 1, requestUniChar = 0; /* assert (objc >= 2) */ /* * Analyze to determine what representation result should be. * GOALS: Avoid shimmering & string rep generation. * Produce pure bytearray when possible. * Error on overflow. */ ov = objv, oc = objc; while (oc-- && (binary || allowUniChar)) { objPtr = *ov++; if (objPtr->bytes) { /* Value has a string rep. */ if (objPtr->length) { /* * Non-empty string rep. Not a pure bytearray, so we * won't create a pure bytearray */ binary = 0; if ((objPtr->typePtr) && (objPtr->typePtr != &tclStringType)) { /* Prevent shimmer of non-string types. */ allowUniChar = 0; } } } else { /* assert (objPtr->typePtr != NULL) -- stork! */ if (TclIsPureByteArray(objPtr)) { allowUniChar = 0; } else { binary = 0; if (objPtr->typePtr == &tclStringType) { /* Have a pure Unicode value; ask to preserve it */ requestUniChar = 1; } else { /* Have another type; prevent shimmer */ allowUniChar = 0; } } } } if (binary) { /* Result will be pure byte array. Pre-size it */ ov = objv; oc = objc; while (oc-- && (length >= 0)) { objPtr = *ov++; if (objPtr->bytes == NULL) { int numBytes; Tcl_GetByteArrayFromObj(objPtr, &numBytes); if (length == 0) { first = objc - oc - 1; } length += numBytes; } } } else if (allowUniChar && requestUniChar) { /* Result will be pure Tcl_UniChar array. Pre-size it. */ ov = objv; oc = objc; while (oc-- && (length >= 0)) { objPtr = *ov++; if ((objPtr->bytes == NULL) || (objPtr->length)) { int numChars; Tcl_GetUnicodeFromObj(objPtr, &numChars); if (length == 0) { first = objc - oc - 1; } length += numChars; } } } else { /* Result will be concat of string reps. Pre-size it. */ ov = objv; oc = objc; while (oc-- && (length >= 0)) { int numBytes; objPtr = *ov++; Tcl_GetStringFromObj(objPtr, &numBytes); if ((length == 0) && numBytes) { first = objc - oc - 1; } length += numBytes; } } if (length < 0) { if (interp) { Tcl_SetObjResult(interp, Tcl_ObjPrintf( "max size for a Tcl value (%d bytes) exceeded", INT_MAX)); Tcl_SetErrorCode(interp, "TCL", "MEMORY", NULL); } return TCL_ERROR; } if (length == 0) { /* Total length of zero means every value has length zero */ *objPtrPtr = objv[0]; return TCL_OK; } objv += first; objc -= first; if (binary) { /* Efficiently produce a pure byte array result */ unsigned char *dst; if (inPlace && !Tcl_IsShared(*objv)) { int start; objResultPtr = *objv++; objc--; Tcl_GetByteArrayFromObj(objResultPtr, &start); dst = Tcl_SetByteArrayLength(objResultPtr, length) + start; } else { objResultPtr = Tcl_NewByteArrayObj(NULL, length); dst = Tcl_SetByteArrayLength(objResultPtr, length); } while (objc--) { Tcl_Obj *objPtr = *objv++; if (objPtr->bytes == NULL) { int more; unsigned char *src = Tcl_GetByteArrayFromObj(objPtr, &more); memcpy(dst, src, (size_t) more); dst += more; } } } else if (allowUniChar && requestUniChar) { /* Efficiently produce a pure Tcl_UniChar array result */ Tcl_UniChar *dst; if (inPlace && !Tcl_IsShared(*objv)) { int start; objResultPtr = *objv++; objc--; /* Ugly interface! Force resize of the unicode array. */ Tcl_GetUnicodeFromObj(objResultPtr, &start); Tcl_InvalidateStringRep(objResultPtr); Tcl_SetObjLength(objResultPtr, length); dst = Tcl_GetUnicode(objResultPtr) + start; } else { Tcl_UniChar ch = 0; /* Ugly interface! No scheme to init array size. */ objResultPtr = Tcl_NewUnicodeObj(&ch, 0); Tcl_SetObjLength(objResultPtr, length); dst = Tcl_GetUnicode(objResultPtr); } while (objc--) { Tcl_Obj *objPtr = *objv++; if ((objPtr->bytes == NULL) || (objPtr->length)) { int more; Tcl_UniChar *src = Tcl_GetUnicodeFromObj(objPtr, &more); memcpy(dst, src, more * sizeof(Tcl_UniChar)); dst += more; } } } else { /* Efficiently concatenate string reps */ char *dst; if (inPlace && !Tcl_IsShared(*objv)) { int start; objResultPtr = *objv++; objc--; Tcl_GetStringFromObj(objResultPtr, &start); Tcl_SetObjLength(objResultPtr, length); dst = Tcl_GetString(objResultPtr) + start; if (length > start) { TclFreeIntRep(objResultPtr); } } else { objResultPtr = Tcl_NewObj(); Tcl_SetObjLength(objResultPtr, length); dst = Tcl_GetString(objResultPtr); } while (objc--) { Tcl_Obj *objPtr = *objv++; if ((objPtr->bytes == NULL) || (objPtr->length)) { int more; char *src = Tcl_GetStringFromObj(objPtr, &more); memcpy(dst, src, (size_t) more); dst += more; } } } *objPtrPtr = objResultPtr; return TCL_OK; } /* *--------------------------------------------------------------------------- * * TclStringFind -- * * Implements the [string first] operation. * * Results: * If needle is found as a substring of haystack, the index of the * first instance of such a find is returned. If needle is not present * as a substring of haystack, -1 is returned. * * Side effects: * needle and haystack may have their Tcl_ObjType changed. * *--------------------------------------------------------------------------- */ int TclStringFind( Tcl_Obj *needle, Tcl_Obj *haystack, unsigned int start) { int lh, ln = Tcl_GetCharLength(needle); if (ln == 0) { /* * We don't find empty substrings. Bizarre! * * TODO: When we one day make this a true substring * finder, change this to "return 0" */ return -1; } if (TclIsPureByteArray(needle) && TclIsPureByteArray(haystack)) { unsigned char *end, *try, *bh; unsigned char *bn = Tcl_GetByteArrayFromObj(needle, &ln); bh = Tcl_GetByteArrayFromObj(haystack, &lh); end = bh + lh; try = bh + start; while (try + ln <= end) { try = memchr(try, bn[0], end - try); if (try == NULL) { return -1; } if (0 == memcmp(try+1, bn+1, ln-1)) { return (try - bh); } try++; } return -1; } lh = Tcl_GetCharLength(haystack); if (haystack->bytes && (lh == haystack->length)) { /* haystack is all single-byte chars */ if (needle->bytes && (ln == needle->length)) { /* needle is also all single-byte chars */ char *found = strstr(haystack->bytes + start, needle->bytes); if (found) { return (found - haystack->bytes); } else { return -1; } } else { /* * Cannot find substring with a multi-byte char inside * a string with no multi-byte chars. */ return -1; } } else { Tcl_UniChar *try, *end, *uh; Tcl_UniChar *un = Tcl_GetUnicodeFromObj(needle, &ln); uh = Tcl_GetUnicodeFromObj(haystack, &lh); end = uh + lh; try = uh + start; while (try + ln <= end) { if ((*try == *un) && (0 == memcmp(try+1, un+1, (ln-1)*sizeof(Tcl_UniChar)))) { return (try - uh); } try++; } return -1; } } /* *--------------------------------------------------------------------------- * * TclStringObjReverse -- * * 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 * TclStringObjReverse( Tcl_Obj *objPtr) { String *stringPtr; Tcl_UniChar ch; 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; if (Tcl_IsShared(objPtr)) { Tcl_UniChar *to; /* * Create a non-empty, pure unicode value, so we can coax * Tcl_SetObjLength into growing the unicode rep buffer. */ ch = 0; objPtr = Tcl_NewUnicodeObj(&ch, 1); Tcl_SetObjLength(objPtr, stringPtr->numChars); to = Tcl_GetUnicode(objPtr); while (--src >= from) { *to++ = *src; } } else { /* Reversing in place */ while (--src > from) { ch = *src; *src = *from; *from++ = ch; } } } if (objPtr->bytes) { int numChars = stringPtr->numChars; int numBytes = objPtr->length; char *to, *from = objPtr->bytes; if (Tcl_IsShared(objPtr)) { objPtr = Tcl_NewObj(); 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 charCount = 0; int bytesLeft = numBytes; 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 = Tcl_UtfToUniChar(from, &ch); ReverseBytes((unsigned char *)to, (unsigned char *)from, bytesInChar); to += bytesInChar; from += bytesInChar; bytesLeft -= bytesInChar; charCount++; } from = to = objPtr->bytes; stringPtr->numChars = charCount; } /* 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 alread 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; 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, dst); } *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 (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; 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 reputation 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 intrep 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 represention * 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) { /* * Pre-condition: this is the "string" Tcl_ObjType. */ int i, origLength, size = 0; char *dst; 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 += TclUtfCount(unicode[i]); } 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((int) 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: */