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py/modbuiltins: Share vstr_add_char's implementation of utf8 encoding. 

This saves ~84 bytes on trinket m0, and saves 112 bytes on PYBV10.

Signed-off-by: Jeff Epler <jepler@gmail.com>
This commit is contained in:
Jeff Epler 2023-11-23 11:49:57 -06:00 committed by Damien George
parent cfcd0c4022
commit 9c7067d9ad
1 changed files with 4 additions and 22 deletions
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26
py/modbuiltins.c
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@ -137,30 +137,12 @@ MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_callable_obj, mp_builtin_callable);
STATIC mp_obj_t mp_builtin_chr(mp_obj_t o_in) {
#if MICROPY_PY_BUILTINS_STR_UNICODE
mp_uint_t c = mp_obj_get_int(o_in);
uint8_t str[4];
int len = 0;
if (c < 0x80) {
*str = c;
len = 1;
} else if (c < 0x800) {
str[0] = (c >> 6) | 0xC0;
str[1] = (c & 0x3F) | 0x80;
len = 2;
} else if (c < 0x10000) {
str[0] = (c >> 12) | 0xE0;
str[1] = ((c >> 6) & 0x3F) | 0x80;
str[2] = (c & 0x3F) | 0x80;
len = 3;
} else if (c < 0x110000) {
str[0] = (c >> 18) | 0xF0;
str[1] = ((c >> 12) & 0x3F) | 0x80;
str[2] = ((c >> 6) & 0x3F) | 0x80;
str[3] = (c & 0x3F) | 0x80;
len = 4;
} else {
if (c >= 0x110000) {
mp_raise_ValueError(MP_ERROR_TEXT("chr() arg not in range(0x110000)"));
}
return mp_obj_new_str_via_qstr((char *)str, len);
VSTR_FIXED(buf, 4);
vstr_add_char(&buf, c);
return mp_obj_new_str_via_qstr(buf.buf, buf.len);
#else
mp_int_t ord = mp_obj_get_int(o_in);
if (0 <= ord && ord <= 0xff) {