[GRASS-dev] v.digit startup segfault - improbable fix
Cedric Shock
cedricgrass at shockfamily.net
Thu May 4 15:52:51 EDT 2006
Hi,
I carefully picked over the v.digit segfault exemplar from Ivan Marchesini.
If you are experiencing a v.digit segfault on startup please try the new patch
I just kicked into CVS.
Hints for future debugging: set DEBUG to at least 5.
Report what tcl/tk version v.digit is being LINKED against.
I changed argument count on Tk_Main from 0 to argc. Reasoning:
Tcl_ExternalToUtfDString is used very few places in the tcl and tk sources. A
good chunk of them are in the handling of argc and argv in Tcl_Main and
Tk_MainEx, so I'm inclined to believe the backtrace that says it's happening
here. The code doesn't look like it was written to ever expect 0 argc. This
section of code has been entirely rewritten between tcl 8.3 and 8.4. The 8.4
code looks like it's happy with 0.
Counter reasoning: It's been 0 since forever. This had to be working for some
developer using tcl 8.3 at some time.
Counter counter reasoning: whether or not Tcl_ExternalToUtfDString calls
strlen is dependent upon the source encoding, but here I think it's all the
same (coming from the command line).
--Cedric
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