ref: a70b93a356662355214f5405edda066786f6dd03
dir: /sys/src/cmd/tcs/jis.h/
/* following astonishing goo courtesy of kogure. */ /* * MicroSoft Kanji Encoding (SJIS) Transformation */ /* * void * J2S(unsigned char *_h, unsigned char *_l) * JIS X 208 to MS kanji transformation. * * Calling/Exit State: * _h and _l should be in their valid range. * No return value. */ #define J2S(_h, _l) { \ /* lower: 21-7e >> 40-9d,9e-fb >> 40-7e,(skip 7f),80-fc */ \ if (((_l) += (((_h)-- % 2) ? 0x1f : 0x7d)) > 0x7e) (_l)++; \ /* upper: 21-7e >> 81-af >> 81-9f,(skip a0-df),e0-ef */ \ if (((_h) = ((_h) / 2 + 0x71)) > 0x9f) (_h) += 0x40; \ } /* * void * S2J(unsigned char *_h, unsigned char *_l) * MS kanji to JIS X 208 transformation. * * Calling/Exit State: * _h and _l should be in valid range. * No return value. */ #define S2J(_h, _l) { \ /* lower: 40-7e,80-fc >> 21-5f,61-dd >> 21-7e,7f-dc */ \ if (((_l) -= 0x1f) > 0x60) (_l)--; \ /* upper: 81-9f,e0-ef >> 00-1e,5f-6e >> 00-2e >> 21-7d */ \ if (((_h) -= 0x81) > 0x5e) (_h) -= 0x40; (_h) *= 2, (_h) += 0x21; \ /* upper: ,21-7d >> ,22-7e ; lower: ,7f-dc >> ,21-7e */ \ if ((_l) > 0x7e) (_h)++, (_l) -= 0x5e; \ } /* * int * ISJKANA(const unsigned char *_b) * Tests given byte is in the range of JIS X 0201 katakana. * * Calling/Exit State: * Returns 1 if it is, or 0 otherwise. */ #define ISJKANA(_b) (0xa0 <= (_b) && (_b) < 0xe0) /* * int * CANS2JH(const unsigned char *_h) * Tests given byte is in the range of valid first byte of MS * kanji code; either acts as a subroutine of CANS2J() macro * or can be used to parse MS kanji encoded strings. * * Calling/Exit State: * Returns 1 if it is, or 0 otherwise. */ #define CANS2JH(_h) ((0x81 <= (_h) && (_h) < 0xf0) && !ISJKANA(_h)) /* * int * CANS2JL(const unsigned char *_l) * Tests given byte is in the range of valid second byte of MS * kanji code; acts as a subroutine of CANS2J() macro. * * Calling/Exit State: * Returns 1 if it is, or 0 otherwise. */ #define CANS2JL(_l) (0x40 <= (_l) && (_l) < 0xfd && (_l) != 0x7f) /* * int * CANS2J(const unsigned char *_h, const unsinged char *_l) * Tests given bytes form a MS kanji code point which can be * transformed to a valid JIS X 208 code point. * * Calling/Exit State: * Returns 1 if they are, or 0 otherwise. */ #define CANS2J(_h, _l) (CANS2JH(_h) && CANS2JL(_l)) /* * int * CANJ2SB(const unsigned char *_b) * Tests given bytes is in the range of valid 94 graphic * character set; acts as a subroutine of CANJ2S() macro. * * Calling/Exit State: * Returns 1 if it is, or 0 otherwise. */ #define CANJ2SB(_b) (0x21 <= (_b) && (_b) < 0x7f) /* * int * CANJ2S(const unsigned char *_h, const unsigned char *_l) * Tests given bytes form valid JIS X 208 code points * (which can be transformed to MS kanji). * * Calling/Exit State: * Returns 1 if they are, or 0 otherwise. */ #define CANJ2S(_h, _l) (CANJ2SB(_h) && CANJ2SB(_l))