Sandbox::https://github.com/pullreq/fish-shell/blob/builtin-curses-and-terminfo/intern.h

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/** \file intern.h

Library for pooling common strings

#ifndef FISH_INTERN_H

#define FISH_INTERN_H

#include <wchar.h>

/**

Return an identical copy of the specified string from a pool of unique strings. If the string was not in the pool, add a copy.

\param in the string to return an interned copy of

const wchar_t *intern(const wchar_t *in);

/**

Insert the specified string literal into the pool of unique

strings. The string will not first be copied, and it will not be

free'd on exit.

\param in the string to add to the interned pool

const wchar_t *intern_static(const wchar_t *in);

#endif