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This reverts commit 0717a2194e863f3a78595184ccc5637697f03353, reversing
changes made to 71a40658a0cef8b3e25df3a8e48a72d0563a89bf.
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* maint:
filename: Add safe_relative_path/1
Conflicts:
lib/stdlib/src/filename.erl
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Add safe_relative_path/1 to guard against directory traversal
attacks. It either returns a shorter path without any ".." or
"." components, or 'unsafe' if an ".." component would climb
up above the root of the relative path. Here are a few
examples:
safe_relative_path("a/b/..") => "a"
safe_relative_path("a/..") => ""
safe_relative_path("a/../..") => unsafe
safe_relative_path("/absolute/path") => unsafe
The returned path can be used directly or combined with an
absolute path using filename:join/2.
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Language cleaned up by the technical writers xsipewe and tmanevik
from Combitech. Proofreading and corrections by Björn Gustavsson
and Hans Bolinder.
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Use Erlang specs and types for documentation
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In the transition from SGML to XML (several releases ago),
bugs were introduced in the documentation, for instance
"\n" replaced by newlines. Correct those bugs.
Also correct double backslashes. They seem to have been introduced very
early in the development of OTP. According to Lars they "solved" a bug
in the generation of HTML &c. Now that standard tools are used instead
of docbuilder, the bug has become visible.
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