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Top Forums UNIX for Advanced & Expert Users Dot sourcing differences in ksh, AIX vs Linux vs Solaris Post 302887481 by Perderabo on Saturday 8th of February 2014 12:13:03 AM
Old 02-08-2014
I now have a theory regarding the three behaviors that Charles reported. The ability to source a function was intended to be used with ksh style functions. These normally create their own scope and by sourcing them they behave like like posix style function.

Charles is defining a posix style function and then is sourcing that. This was not intended to happen. My theory is that AIX is advanced enough to support an early implementation of the function sourcing code. And in this implementation the attempt to source a posix style function is simply ignored.

And my theory continues that users were surprised that some functions could be sourced while other could not. And so, in the spirit of least surprise, ksh was modified to tolerate the sourcing of posix style functions.

The documenation does say that sourcing ksh style function is the feature that was added to ksh. The docs neither allow or prohibit sourcing a posix style function as far as I can see. Whether or not my theory is correct, sourcing a posix style function is an undocumented feature and Charles clearly has seen two different behaviors. I think it would be wise to stick only to the functionality that is explicitly allowed by the documentation.
 

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Tk_GetJoinStyle(3)					       Tk Library Procedures						Tk_GetJoinStyle(3)

__________________________________________________________________________________________________________________________________________________

NAME
Tk_GetJoinStyle, Tk_NameOfJoinStyle - translate between strings and join styles SYNOPSIS
#include <tk.h> int Tk_GetJoinStyle(interp, string, joinPtr) const char * Tk_NameOfJoinStyle(join) ARGUMENTS
Tcl_Interp *interp (in) Interpreter to use for error reporting. const char *string (in) String containing name of join style: one of "bevel", "miter", or "round". int *joinPtr (out) Pointer to location in which to store X join style corresponding to string. int join (in) Join style: one of JoinBevel, JoinMiter, JoinRound. _________________________________________________________________ DESCRIPTION
Tk_GetJoinStyle places in *joinPtr the X join style corresponding to string, which will be one of JoinBevel, JoinMiter, or JoinRound. Join styles are typically used in X graphics contexts to indicate how adjacent line segments should be joined together. See the X documentation for information on what each style implies. Under normal circumstances the return value is TCL_OK and interp is unused. If string does not contain a valid join style or an abbrevia- tion of one of these names, then an error message is stored in interp->result, TCL_ERROR is returned, and *joinPtr is unmodified. Tk_NameOfJoinStyle is the logical inverse of Tk_GetJoinStyle. Given a join style such as JoinBevel it returns a statically-allocated string corresponding to join. If join is not a legal join style, then "unknown join style" is returned. KEYWORDS
bevel, join style, miter, round Tk Tk_GetJoinStyle(3)
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