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Looking through multibyte_char_to_unibyte

From: Dmitry Antipov
Subject: Looking through multibyte_char_to_unibyte
Date: Sun, 22 Jun 2014 21:09:19 +0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

Looking through preprocessed src/character.c, I found the following function:

multibyte_char_to_unibyte (int c)
  if (c < 0x80)
    return c;
  if (((c) > 0x3FFF7F))
    return (((c) > 0x3FFF7F) ? (c) - 0x3FFF00 : multibyte_char_to_unibyte (c));
  return (c & 0xFF);

Is this a subtle trick which I just can't understand and explain, or something
is really wrong with this?


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