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OpenDarwin 7.2.1 - man page for tcl_getindexfromobj (opendarwin section 3)

Tcl_GetIndexFromObj(3)		      Tcl Library Procedures		   Tcl_GetIndexFromObj(3)


       Tcl_GetIndexFromObj, Tcl_GetIndexFromObjStruct - lookup string in table of keywords

       #include <tcl.h>

       Tcl_GetIndexFromObj(interp, objPtr, tablePtr, msg, flags,

       int											  |
       Tcl_GetIndexFromObjStruct(interp, objPtr, structTablePtr, offset,			  |
       msg, flags, indexPtr)									  |

       Tcl_Interp   *interp	 (in)	   Interpreter	to use for error reporting; if NULL, then
					   no message is provided on errors.

       Tcl_Obj	    *objPtr	 (in/out)  The string value of this  object  is  used  to  search
					   through tablePtr.  The internal representation is mod-
					   ified to hold the index of the matching table entry.

       CONST char   **tablePtr	 (in)	   An array of null-terminated strings.  The end  of  the
					   array is marked by a NULL string pointer.

       CONST VOID   *structTablePtr(in)    An  array  of  arbitrary  type,  typically some struct
					   type.  The first member of the  structure  must  be	a
					   null-terminated  string.  The size of the structure is
					   given by offset.					  |

       int	    offset	 (in)								  |
					   The offset to add to structTablePtr to get to the next |
					   entry.   The  end  of  the  array  is marked by a NULL |
					   string pointer.

       CONST char   *msg	 (in)	   Null-terminated string describing what is being looked
					   up,	such as option.  This string is included in error

       int	    flags	 (in)	   OR-ed combination of bits providing additional  infor-
					   mation  for operation.  The only bit that is currently
					   defined is TCL_EXACT.

       int	    *indexPtr	 (out)	   The index of the string in tablePtr that  matches  the
					   value of objPtr is returned here.

       This  procedure	provides  an  efficient way for looking up keywords, switch names, option
       names, and similar things where the value of an object must be one of a predefined set  of
       values.	 ObjPtr  is  compared against each of the strings in tablePtr to find a match.	A
       match occurs if objPtr's string value is identical to one of the strings in  tablePtr,  or
       if  it  is  a  unique  abbreviation  for  exactly  one  of the strings in tablePtr and the
       TCL_EXACT flag was not specified; in either case the index of the matching entry is stored
       at *indexPtr and TCL_OK is returned.

       If  there  is  no  matching  entry,  TCL_ERROR is returned and an error message is left in
       interp's result if interp isn't NULL.  Msg is included in the error  message  to  indicate
       what  was  being  looked  up.  For example, if msg is option the error message will have a
       form like bad option "firt": must be first, second, or third.

       If Tcl_GetIndexFromObj completes successfully it modifies the internal  representation  of
       objPtr  to  hold  the  address  of  the	table  and  the  index of the matching entry.  If
       Tcl_GetIndexFromObj is invoked again with the same objPtr  and  tablePtr  arguments  (e.g.
       during a reinvocation of a Tcl command), it returns the matching index immediately without
       having to redo the lookup operation.  Note: Tcl_GetIndexFromObj assumes that  the  entries
       in  tablePtr are static: they must not change between invocations.  If the value of objPtr
       is the empty string, Tcl_GetIndexFromObj will treat it as a non-matching value and  return
       TCL_ERROR.										  |

       Tcl_GetIndexFromObjStruct  works  just  like  Tcl_GetIndexFromObj,  except that instead of |
       treating tablePtr as an array of string pointers, it treats it as the first in a series of |
       string  ptrs  that are spaced apart by offset bytes. This is particularly useful when pro- |
       cessing things like Tk_ConfigurationSpec, whose string keys are in the same place in  each |
       of several array elements.


       index, object, table lookup

Tcl					       8.1			   Tcl_GetIndexFromObj(3)

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