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René Scharfe b1edb40f25 abspath: add absolute_pathdup()

Add a function that returns a buffer containing the absolute path of its
argument and a semantic patch for its intended use.  It avoids an extra
string copy to a static buffer.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2017-01-26 14:51:06 -08:00

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 @@
 expression E;
 expression V;
 @@
 - if (E)
 -    V = xstrdup(E);
 + V = xstrdup_or_null(E);
 @@
 expression E;
 @@
 - xstrdup(absolute_path(E))
 + absolute_pathdup(E)