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In wt_longstatus_print_tracking() we may conditionally show a comment
prefix based on the wt_status->display_comment_prefix flag. We handle
that by creating a local "comment_line_string" that is either the empty
string or the comment character followed by a space.
For a single-byte comment, the maximum length of this string is 2 (plus
a NUL byte). But to handle multi-byte comment characters, it can be
arbitrarily large. One way to handle this is to just call
xstrfmt("%s ", comment_line_str), and then free it when we're done.
But we can simplify things further by just conditionally switching
between our prefix string and an empty string when formatting. We
couldn't just do that with the previous code, because the comment
character was a single byte. There's no way to have a "%c" format switch
between some character and "no character at all". Whereas with "%s" you
can switch between some string and the empty string. So now that we have
a comment string and not a comment char, we can just use it directly
when formatting. Do note that we have to also conditionally add the
trailing space at the same time.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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