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#include "prism/enc/pm_encoding.h"
static size_t
pm_encoding_shift_jis_char_width(const uint8_t *b, ptrdiff_t n) {
// These are the single byte characters.
if (*b < 0x80 || (*b >= 0xA1 && *b <= 0xDF)) {
return 1;
}
// These are the double byte characters.
if (
(n > 1) &&
((b[0] >= 0x81 && b[0] <= 0x9F) || (b[0] >= 0xE0 && b[0] <= 0xFC)) &&
(b[1] >= 0x40 && b[1] <= 0xFC)
) {
return 2;
}
return 0;
}
static size_t
pm_encoding_shift_jis_alpha_char(const uint8_t *b, ptrdiff_t n) {
if (pm_encoding_shift_jis_char_width(b, n) == 1) {
return pm_encoding_ascii_alpha_char(b, n);
} else {
return 0;
}
}
static size_t
pm_encoding_shift_jis_alnum_char(const uint8_t *b, ptrdiff_t n) {
if (pm_encoding_shift_jis_char_width(b, n) == 1) {
return pm_encoding_ascii_alnum_char(b, n);
} else {
return 0;
}
}
static bool
pm_encoding_shift_jis_isupper_char(const uint8_t *b, ptrdiff_t n) {
if (pm_encoding_shift_jis_char_width(b, n) == 1) {
return pm_encoding_ascii_isupper_char(b, n);
} else {
return 0;
}
}
pm_encoding_t pm_encoding_shift_jis = {
.name = "shift_jis",
.char_width = pm_encoding_shift_jis_char_width,
.alnum_char = pm_encoding_shift_jis_alnum_char,
.alpha_char = pm_encoding_shift_jis_alpha_char,
.isupper_char = pm_encoding_shift_jis_isupper_char,
.multibyte = true
};
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