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From: Peter Lemenkov <lemenkov@gmail.com>
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Date: Sat, 8 Nov 2014 15:11:04 +0300
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Subject: [PATCH] Introduce os:getenv/2
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Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
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diff --git a/lib/kernel/doc/src/os.xml b/lib/kernel/doc/src/os.xml
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index 9122267..7ec1f8e 100644
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--- a/lib/kernel/doc/src/os.xml
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+++ b/lib/kernel/doc/src/os.xml
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@@ -100,6 +100,19 @@ DirOut = os:cmd("dir"), % on Win32 platform
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</desc>
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</func>
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<func>
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+ <name name="getenv" arity="2"/>
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+ <fsummary>Get the value of an environment variable</fsummary>
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+ <desc>
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+ Returns the <c><anno>Value</anno></c> of the environment variable
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+ <c><anno>VarName</anno></c>, or <c>DefaultValue</c> if the environment variable
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+ is undefined.
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+ If Unicode file name encoding is in effect (see the
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+ marker="erts:erl#file_name_encoding">erl manual
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+ page</seealso>), the strings (both <c><anno>VarName</anno></c> and
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+ <c><anno>Value</anno></c>) may contain characters with codepoints > 255.
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+ </desc>
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+ </func>
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+ <func>
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<name name="getpid" arity="0"/>
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<fsummary>Return the process identifier of the emulator process</fsummary>
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<desc>
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diff --git a/lib/kernel/src/os.erl b/lib/kernel/src/os.erl
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index 9415593..d5ef994 100644
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--- a/lib/kernel/src/os.erl
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+++ b/lib/kernel/src/os.erl
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@@ -26,7 +26,7 @@
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%%% BIFs
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--export([getenv/0, getenv/1, getpid/0, putenv/2, timestamp/0, unsetenv/1]).
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+-export([getenv/0, getenv/1, getenv/2, getpid/0, putenv/2, timestamp/0, unsetenv/1]).
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-spec getenv() -> [string()].
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@@ -39,6 +39,19 @@ getenv() -> erlang:nif_error(undef).
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getenv(_) ->
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erlang:nif_error(undef).
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+-spec getenv(VarName, DefaultValue) -> Value when
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+ VarName :: string(),
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+ DefaultValue :: string(),
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+ Value :: string().
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+
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+getenv(VarName, DefaultValue) ->
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+ case os:getenv(VarName) of
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+ false ->
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+ DefaultValue;
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+ Value ->
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+ Value
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+ end.
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+
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-spec getpid() -> Value when
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Value :: string().
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