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Found by 'make syntax-check'.
Cherry picked from commit a67129b0fb45b2f83eb711c6c599569d0f53e580
and modified for 1.18 branch.
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Previously the code would drop the first character in any sequence of
non-printing characters that occurred within a string.
Fix for commit e6f18c59d577dd0b443bc6a1d76f699c4e0dde9f.
(cherry picked from commit 73071b3163774ff9a514a05bc8e6fb35fa910787)
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Fix for commit e6f18c59d577dd0b443bc6a1d76f699c4e0dde9f.
(cherry picked from commit fba81add94cde015afe8a65245cb4e60a1d3e6bf)
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This event is generated whenever a libguestfs function is called.
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The default event handler in libguestfs was simply writing all debug
output directly to stderr. However if the output contains
non-printable characters such as terminal control codes then these
would also be sent directly.
With newer SeaBIOS there is a lame attempt to implement a splash
screen using terminal control codes, thus when libguestfs tries to
display debugging output it would cause the screen to clear and debug
output to be lost.
This commit causes all non-printing characters to be escaped.
(\n and \r characters from the appliance are treated somewhat
specially).
Furthermore, instead of using write(2), use buffered stderr calls.
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* src/events.c: Include <string.h>, for use of strlen.
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This API allows more than one callback to be registered for each
event, makes it possible to call the API from other languages, and
allows [nearly all] log, debug and trace messages to be rerouted from
stderr.
An older version of this API was discussed on the mailing list here:
https://www.redhat.com/archives/libguestfs/2010-December/msg00081.html
https://www.redhat.com/archives/libguestfs/2011-January/msg00012.html
This also updates guestfish to use the new API for its progress bars.
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