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vere: directly implements utf-32 to utf-8 conversion

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This commit is contained in:
Joe Bryan 2020-09-11 00:22:47 -07:00
parent 49210f49f3
commit 4eaffc87b2
1 changed files with 31 additions and 5 deletions
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36
pkg/urbit/vere/io/term.c
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@ -485,11 +485,39 @@ _term_it_set_line(u3_utty* uty_u,
c3_w sap_w)
{
u3_utat* tat_u = &uty_u->tat_u;
u3_noun txt = u3do("tuft", u3i_words(wor_w, lin_w));
c3_w byt_w = u3r_met(3, txt);
c3_y* hun_y = (c3_y*)lin_w;
c3_w byt_w = 0;
u3r_bytes(0, byt_w, hun_y, txt);
// convert lin_w in-place from utf-32 to utf-8
//
// (this is just a hand-translation of +tuft)
//
{
c3_w car_w, i_w;
for ( i_w = 0; i_w < wor_w; i_w++ ) {
car_w = lin_w[i_w];
if ( 0x7f >= car_w ) {
hun_y[byt_w++] = car_w;
}
else if ( 0x7ff >= car_w ) {
hun_y[byt_w++] = 0xc0 ^ ((car_w >> 6) & 0x1f);
hun_y[byt_w++] = 0x80 ^ (car_w & 0x3f);
}
else if ( 0xffff >= car_w ) {
hun_y[byt_w++] = 0xe0 ^ ((car_w >> 12) & 0xf);
hun_y[byt_w++] = 0x80 ^ ((car_w >> 6) & 0x3f);
hun_y[byt_w++] = 0x80 ^ (car_w & 0x3f);
}
else {
hun_y[byt_w++] = 0xf0 ^ ((car_w >> 18) & 0x7);
hun_y[byt_w++] = 0x80 ^ ((car_w >> 12) & 0x3f);
hun_y[byt_w++] = 0x80 ^ ((car_w >> 6) & 0x3f);
hun_y[byt_w++] = 0x80 ^ (car_w & 0x3f);
}
}
}
c3_free(tat_u->mir.lin_y);
tat_u->mir.lin_y = hun_y;
@ -498,8 +526,6 @@ _term_it_set_line(u3_utty* uty_u,
tat_u->mir.sap_w = sap_w;
_term_it_show_line(uty_u, wor_w, sap_w);
u3z(txt);
}
/* _term_it_show_more(): new current line.