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CentOS 7.0 - man page for tcl_setstringobj (centos section 3)

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Tcl_StringObj(3)		      Tcl Library Procedures			 Tcl_StringObj(3)


       Tcl_NewStringObj,   Tcl_NewUnicodeObj,	Tcl_SetStringObj,   Tcl_SetUnicodeObj,	 Tcl_Get-
       StringFromObj,  Tcl_GetString,  Tcl_GetUnicodeFromObj,	Tcl_GetUnicode,   Tcl_GetUniChar,
       Tcl_GetCharLength,  Tcl_GetRange,  Tcl_AppendToObj, Tcl_AppendUnicodeToObj, Tcl_AppendObj-
       ToObj, Tcl_AppendStringsToObj, Tcl_AppendStringsToObjVA, Tcl_AppendLimitedToObj,  Tcl_For-
       mat,   Tcl_AppendFormatToObj,   Tcl_ObjPrintf,	Tcl_AppendPrintfToObj,	Tcl_SetObjLength,
       Tcl_AttemptSetObjLength, Tcl_ConcatObj - manipulate Tcl objects as strings

       #include <tcl.h>

       Tcl_Obj *
       Tcl_NewStringObj(bytes, length)

       Tcl_Obj *
       Tcl_NewUnicodeObj(unicode, numChars)

       Tcl_SetStringObj(objPtr, bytes, length)

       Tcl_SetUnicodeObj(objPtr, unicode, numChars)

       char *
       Tcl_GetStringFromObj(objPtr, lengthPtr)

       char *

       Tcl_UniChar *
       Tcl_GetUnicodeFromObj(objPtr, lengthPtr)

       Tcl_UniChar *

       Tcl_GetUniChar(objPtr, index)


       Tcl_Obj *
       Tcl_GetRange(objPtr, first, last)

       Tcl_AppendToObj(objPtr, bytes, length)

       Tcl_AppendUnicodeToObj(objPtr, unicode, numChars)

       Tcl_AppendObjToObj(objPtr, appendObjPtr)

       Tcl_AppendStringsToObj(objPtr, string, string, ... (char *) NULL)

       Tcl_AppendStringsToObjVA(objPtr, argList)

       void											  |
       Tcl_AppendLimitedToObj(objPtr, bytes, length, limit, ellipsis)				  |

       Tcl_Obj *										  |
       Tcl_Format(interp, format, objc, objv)							  |

       int											  |
       Tcl_AppendFormatToObj(interp, objPtr, format, objc, objv)				  |

       Tcl_Obj *										  |
       Tcl_ObjPrintf(format, ...)								  |

       int											  |
       Tcl_AppendPrintfToObj(objPtr, format, ...)						  |

       Tcl_SetObjLength(objPtr, newLength)

       Tcl_AttemptSetObjLength(objPtr, newLength)

       Tcl_Obj *
       Tcl_ConcatObj(objc, objv)

       const char *bytes (in)			     Points to the first  byte	of  an	array  of
						     UTF-8-encoded bytes used to set or append to
						     a string object.  This byte array	may  con-
						     tain  embedded  null  characters unless num-
						     Chars is  negative.   (Applications  needing
						     null bytes should represent them as the two-
						     byte      sequence       \700\600,       use
						     Tcl_ExternalToUtf	to  convert,  or Tcl_New-
						     ByteArrayObj if the string is  a  collection
						     of uninterpreted bytes.)

       int length (in)				     The  number of bytes to copy from bytes when
						     initializing, setting,  or  appending  to	a
						     string object.  If negative, all bytes up to
						     the first null are used.

       const Tcl_UniChar *unicode (in)		     Points to the first byte of an array of Uni-
						     code  characters  used to set or append to a
						     string object.  This byte array may  contain
						     embedded  null characters unless numChars is

       int numChars (in)			     The number of  Unicode  characters  to  copy
						     from  unicode when initializing, setting, or
						     appending to a string object.  If	negative,
						     all  characters up to the first null charac-
						     ter are used.

       int index (in)				     The  index  of  the  Unicode  character   to

       int first (in)				     The  index of the first Unicode character in
						     the Unicode range to be returned  as  a  new

       int last (in)				     The  index  of the last Unicode character in
						     the Unicode range to be returned  as  a  new

       Tcl_Obj *objPtr (in/out) 		     Points to an object to manipulate.

       Tcl_Obj *appendObjPtr (in)		     The object to append to objPtr in Tcl_Appen-

       int *lengthPtr (out)			     If non-NULL,  the	location  where  Tcl_Get-
						     StringFromObj  will  store  the length of an
						     object's string representation.

       const char *string (in)			     Null-terminated string value  to  append  to

       va_list argList (in)			     An  argument  list which must have been ini-
						     tialised using va_start, and  cleared  using

       int limit (in)				     Maximum number of bytes to be appended.

       const char *ellipsis (in)		     Suffix  to  append  when  the limit leads to
						     string truncation.  If NULL is  passed  then
						     the suffix "..." is used.

       const char *format (in)			     Format control string including % conversion

       int objc (in)				     The number of elements to format or concate-

       Tcl_Obj *objv[] (in)			     The  array  of objects to format or concate-

       int newLength (in)			     New length for the string value  of  objPtr,
						     not including the final null character.

       The  procedures	described  in  this  manual  entry allow Tcl objects to be manipulated as
       string values.  They use the internal representation of the  object  to	store  additional
       information  to	make the string manipulations more efficient.  In particular, they make a
       series of append operations efficient by allocating extra storage space for the string  so
       that  it  does  not have to be copied for each append.  Also, indexing and length computa-
       tions are optimized because the Unicode string representation is calculated and cached  as
       needed.	 When using the Tcl_Append* family of functions where the interpreter's result is
       the object being appended to, it is important to call Tcl_ResetResult first to ensure  you
       are not unintentionally appending to existing data in the result object.

       Tcl_NewStringObj  and Tcl_SetStringObj create a new object or modify an existing object to
       hold a copy of the string given by bytes and length.   Tcl_NewUnicodeObj  and  Tcl_SetUni-
       codeObj	create	a  new	object or modify an existing object to hold a copy of the Unicode
       string given by unicode and numChars.  Tcl_NewStringObj	and  Tcl_NewUnicodeObj	return	a
       pointer	to a newly created object with reference count zero.  All four procedures set the
       object to hold a copy of the specified  string.	 Tcl_SetStringObj  and	Tcl_SetUnicodeObj
       free  any  old  string  representation  as  well as any old internal representation of the

       Tcl_GetStringFromObj and Tcl_GetString return an object's string representation.  This  is
       given  by the returned byte pointer and (for Tcl_GetStringFromObj) length, which is stored
       in lengthPtr if it is non-NULL.	If the object's UTF string representation is invalid (its
       byte pointer is NULL), the string representation is regenerated from the object's internal
       representation.	The storage referenced by the returned	byte  pointer  is  owned  by  the
       object manager.	It is passed back as a writable pointer so that extension author creating
       their own Tcl_ObjType will  be  able  to  modify  the  string  representation  within  the
       Tcl_UpdateStringProc  of  their Tcl_ObjType.  Except for that limited purpose, the pointer
       returned by Tcl_GetStringFromObj or Tcl_GetString should be treated as read-only.   It  is
       recommended  that this pointer be assigned to a (const char *) variable.  Even in the lim-
       ited situations where writing to this pointer is  acceptable,  one  should  take  care  to
       respect	the  copy-on-write  semantics  required  by  Tcl_Obj's, with appropriate calls to
       Tcl_IsShared and Tcl_DuplicateObj prior to any in-place modification of the string  repre-
       sentation.   The  procedure Tcl_GetString is used in the common case where the caller does
       not need the length of the string representation.

       Tcl_GetUnicodeFromObj and Tcl_GetUnicode return an object's value  as  a  Unicode  string.
       This  is  given	by  the returned pointer and (for Tcl_GetUnicodeFromObj) length, which is
       stored in lengthPtr if it is non-NULL.	The  storage  referenced  by  the  returned  byte
       pointer is owned by the object manager and should not be modified by the caller.  The pro-
       cedure Tcl_GetUnicode is used in the common case where the caller does not need the length
       of the unicode string representation.

       Tcl_GetUniChar returns the index'th character in the object's Unicode representation.

       Tcl_GetRange  returns a newly created object comprised of the characters between first and
       last (inclusive) in the object's Unicode representation.  If the object's  Unicode  repre-
       sentation  is  invalid, the Unicode representation is regenerated from the object's string

       Tcl_GetCharLength returns the number of characters (as opposed to  bytes)  in  the  string

       Tcl_AppendToObj appends the data given by bytes and length to the string representation of
       the object specified by objPtr.	If the object has an invalid string representation,  then
       an  attempt  is made to convert bytes is to the Unicode format.	If the conversion is suc-
       cessful, then the converted form of bytes is appended to the object's Unicode  representa-
       tion.   Otherwise, the object's Unicode representation is invalidated and converted to the
       UTF format, and bytes is appended to the object's new string representation.

       Tcl_AppendUnicodeToObj appends the Unicode string given by unicode  and	numChars  to  the
       object  specified  by  objPtr.	If the object has an invalid Unicode representation, then
       unicode is converted to the UTF format and appended to the object's string representation.
       Appends	are optimized to handle repeated appends relatively efficiently (it overallocates
       the string or Unicode space to avoid repeated reallocations and copies of object's  string

       Tcl_AppendObjToObj  is  similar	to  Tcl_AppendToObj, but it appends the string or Unicode
       value (whichever exists and is best suited to be appended to objPtr)  of  appendObjPtr  to

       Tcl_AppendStringsToObj  is  similar  to	Tcl_AppendToObj except that it can be passed more
       than one value to append and each value must be a null-terminated string (i.e. none of the
       values  may contain internal null characters).  Any number of string arguments may be pro-
       vided, but the last argument must be a NULL pointer to indicate the end of the list.

       Tcl_AppendStringsToObjVA is the same as Tcl_AppendStringsToObj except that instead of tak-
       ing a variable number of arguments it takes an argument list.

       Tcl_AppendLimitedToObj is similar to Tcl_AppendToObj except that it imposes a limit on how |
       many bytes are appended.  This can be handy when the string to be appended might  be  very |
       large, but the value being constructed should not be allowed to grow without bound. A com- |
       mon usage is when constructing an error message, where the end result should be kept short |
       enough  to be read.  Bytes from bytes are appended to objPtr, but no more than limit bytes |
       total are to be appended. If the limit prevents all length bytes that are  available  from |
       being  appended,  then  the appending is done so that the last bytes appended are from the |
       string ellipsis. This allows for an indication of the truncation to be left in the string. |
       When length is -1, all bytes up to the first zero byte are appended, subject to the limit. |
       When ellipsis is NULL, the default string ... is used. When ellipsis is non-NULL, it  must |
       point  to  a  zero-byte-terminated  string  in Tcl's internal UTF encoding.  The number of |
       bytes appended can be less than the lesser of length and limit when appending fewer  bytes |
       is necessary to append only whole multi-byte characters. 				  |

       Tcl_Format  is the C-level interface to the engine of the format command.  The actual com- |
       mand procedure for format is little more than						  |
	      Tcl_Format(interp, Tcl_GetString(objv[1]), objc-2, objv+2);			  |
       The objc Tcl_Obj values in objv are formatted into a string according  to  the  conversion |
       specification in format argument, following the documentation for the format command.  The |
       resulting formatted string is converted to  a  new  Tcl_Obj  with  refcount  of	zero  and |
       returned.   If  some  error  happens  during  production  of the formatted string, NULL is |
       returned, and an error message is recorded in interp, if interp is non-NULL.		  |

       Tcl_AppendFormatToObj is an appending alternative form of  Tcl_Format  with  functionality |
       equivalent to										  |
	      Tcl_Obj *newPtr = Tcl_Format(interp, format, objc, objv); 			  |
	      if (newPtr == NULL) return TCL_ERROR;						  |
	      Tcl_AppendObjToObj(objPtr, newPtr);						  |
	      return TCL_OK;									  |
       but with greater convenience and efficiency when the appending functionality is needed.	  |

       Tcl_ObjPrintf serves as a replacement for the common sequence				  |
	      char buf[SOME_SUITABLE_LENGTH];							  |
	      sprintf(buf, format, ...);							  |
	      Tcl_NewStringObj(buf, -1);							  |
       but with greater convenience and no need to determine SOME_SUITABLE_LENGTH. The formatting |
       is done with the same core formatting engine used by Tcl_Format.  This means  the  set  of |
       supported  conversion specifiers is that of the format command and not that of the sprintf |
       routine where the two sets differ. When a conversion  specifier	passed	to  Tcl_ObjPrintf |
       includes a precision, the value is taken as a number of bytes, as sprintf does, and not as |
       a number of characters, as format does.	This is done on the assumption	that  C  code  is |
       more likely to know how many bytes it is passing around than the number of encoded charac- |
       ters those bytes happen to represent.  The variable number of arguments passed  in  should |
       be  of  the  types  that  would	be suitable for passing to sprintf.  Note in this example |
       usage, x is of type long.								  |
	      long x = 5;									  |
	      Tcl_Obj *objPtr = Tcl_ObjPrintf("Value is %d", x);				  |
       If the value of format contains internal inconsistencies or invalid specifier formats, the |
       formatted  string result produced by Tcl_ObjPrintf will be an error message describing the |
       error.											  |

       Tcl_AppendPrintfToObj is an appending alternative form of Tcl_ObjPrintf with functionality |
       equivalent to										  |
	      Tcl_AppendObjToObj(objPtr, Tcl_ObjPrintf(format, ...));				  |
       but with greater convenience and efficiency when the appending functionality is needed.

       The  Tcl_SetObjLength procedure changes the length of the string value of its objPtr argu-
       ment.  If the newLength argument is greater than the  space  allocated  for  the  object's
       string, then the string space is reallocated and the old value is copied to the new space;
       the bytes between the old length of the string and the new length may have arbitrary  val-
       ues.   If  the  newLength argument is less than the current length of the object's string,
       with objPtr->length is reduced without reallocating the string space; the  original  allo-
       cated  size  for  the  string  is recorded in the object, so that the string length can be
       enlarged in a subsequent call to Tcl_SetObjLength without reallocating  storage.   In  all
       cases Tcl_SetObjLength leaves a null character at objPtr->bytes[newLength].

       Tcl_AttemptSetObjLength is identical in function to Tcl_SetObjLength except that if suffi-
       cient memory to satisfy the request cannot be allocated, it does not cause the Tcl  inter-
       preter  to panic.  Thus, if newLength is greater than the space allocated for the object's
       string, and there is not enough memory available to satisfy the request, Tcl_AttemptSetOb-
       jLength	will  take no action and return 0 to indicate failure.	If there is enough memory
       to satisfy the request, Tcl_AttemptSetObjLength behaves	just  like  Tcl_SetObjLength  and
       returns 1 to indicate success.

       The  Tcl_ConcatObj function returns a new string object whose value is the space-separated
       concatenation of the string representations of all of  the  objects  in	the  objv  array.
       Tcl_ConcatObj  eliminates  leading and trailing white space as it copies the string repre-
       sentations of the objv array to the result. If an element of the objv  array  consists  of
       nothing	but  white  space, then that object is ignored entirely. This white-space removal
       was added to make the output of the concat command cleaner-looking. Tcl_ConcatObj  returns
       a pointer to a newly-created object whose ref count is zero.

       Tcl_NewObj, Tcl_IncrRefCount, Tcl_DecrRefCount, format, sprintf

       append,	internal  representation, object, object type, string object, string type, string
       representation, concat, concatenate, unicode

Tcl					       8.1				 Tcl_StringObj(3)
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