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\arguments{
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\arguments{
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  \item{locale}{character string naming a locale.}
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  \item{locale}{character string naming a locale.}
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}
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}
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\details{
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\details{
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  The operation differs by OS.
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  The operation differs by OS.
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#ifdef windows
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  \describe{
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  A Windows locale is specified like \code{"English_United Kingdom.1252"}.
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    \item{On Windows,}{a locale is specified like \code{"English_United Kingdom.1252"}.
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  The final component gives the codepage, and this defines the encoding.
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  The final component gives the codepage, and this defines the encoding.
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#endif
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    }
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#ifdef unix
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    \item{On Unix-alikes:}{
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  Locale names are normally like \code{es_MX.iso88591}.  If final
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  Locale names are normally like \code{es_MX.iso88591}.  If final
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  component indicates an encoding and it is not \code{utf8} we just need
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  component indicates an encoding and it is not \code{utf8} we just need
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  to look up the equivalent encoding name.  Otherwise, the language
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  to look up the equivalent encoding name.  Otherwise, the language
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  (here \code{es}) is used to choose a primary or fallback encoding.
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  (here \code{es}) is used to choose a primary or fallback encoding.
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#endif
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    }
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  }
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  In the \code{C} locale the answer will be \code{"ASCII"}.
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  In the \code{C} locale the answer will be \code{"ASCII"}.
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}
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}
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\value{
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\value{
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  A character vector naming an encoding and possibly a fallback
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  A character vector naming an encoding and possibly a fallback
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  single-encoding,  \code{NA} if unknown.
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  single-encoding,  \code{NA} if unknown.