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Modules/cjkcodecs/alg_jisx0201.h
#define JISX0201_R_ENCODE(c, assi)                      \
    if ((c) < 0x80 && (c) != 0x5c && (c) != 0x7e)       \
        (assi) = (c);                                   \
    else if ((c) == 0x00a5) (assi) = 0x5c;              \
    else if ((c) == 0x203e) (assi) = 0x7e;
#define JISX0201_K_ENCODE(c, assi)                      \
    if ((c) >= 0xff61 && (c) <= 0xff9f)                 \
        (assi) = (c) - 0xfec0;
#define JISX0201_ENCODE(c, assi)                        \
    JISX0201_R_ENCODE(c, assi)                          \
    else JISX0201_K_ENCODE(c, assi)

#define JISX0201_R_DECODE(c, assi)                      \
    if ((c) < 0x5c) (assi) = (c);                       \
    else if ((c) == 0x5c) (assi) = 0x00a5;              \
    else if ((c) < 0x7e) (assi) = (c);                  \
    else if ((c) == 0x7e) (assi) = 0x203e;              \
    else if ((c) == 0x7f) (assi) = 0x7f;
#define JISX0201_K_DECODE(c, assi)                      \
    if ((c) >= 0xa1 && (c) <= 0xdf)                     \
    (assi) = 0xfec0 + (c);
#define JISX0201_DECODE(c, assi)                        \
    JISX0201_R_DECODE(c, assi)                          \
    else JISX0201_K_DECODE(c, assi)