Bug #249: Improve implementation of function “launch_gv_cmd”
The error detection was adjusted with the commit 4127b554 ("add error checking") from 2020-12-24.
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Improve the exception handling another bit by extending relevant case distinctions.
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Move more code into the wrapper function “check”.
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Omit a semicolon and an extra space character from passed commands.
See also: Complete error handling for a dot program call https://github.com/coccinelle/coccinelle/issues/249
[Various coding style cleanups by Julia Lawall Julia.Lawall@inria.fr]
Signed-off-by: Markus Elfring elfring@users.sourceforge.net