Re: [Tinycc-devel] Unicode letter escape

[Vincent Lefevre]

On 2022-08-05 13:32:04 +0200, Samir Ribić via Tinycc-devel wrote:
> Tcc supports \u escape sequence inside L"" but I have no idea how to
> overcome this problem:
> The code inside parse_escape_string function, in this part
> 
>            case 'x':
>             case 'u':
>             case 'U':
>                 p++;
>                 n = 0;
>                 for(;;) {
>                     c = *p;
>                     if (c >= 'a' && c <= 'f')
>                         c = c - 'a' + 10;
>                     else if (c >= 'A' && c <= 'F')
>                         c = c - 'A' + 10;
>                     else if (isnum(c))
>                         c = c - '0';
>                     else
>                         break;
>                     n = n * 16 + c;
>                     p++;
>                 }
[...]

Note that tccpp.c already has code that selects the right number of
digits:

            case 'x': i = 0; goto parse_hex_or_ucn;
            case 'u': i = 4; goto parse_hex_or_ucn;
            case 'U': i = 8; goto parse_hex_or_ucn;
    parse_hex_or_ucn:
                p++;
                n = 0;
                do {
                    c = *p;
                    if (c >= 'a' && c <= 'f')
                        c = c - 'a' + 10;
                    else if (c >= 'A' && c <= 'F')
                        c = c - 'A' + 10;
                    else if (isnum(c))
                        c = c - '0';
                    else if (i > 0)
                        expect("more hex digits in universal-character-name");
                    else {
                        c = n;
                        goto add_char_nonext;
                    }
                    n = n * 16 + c;
                    p++;
                } while (--i);
                cstr_u8cat(outstr, n);
                continue;

Perhaps some code could be shared, possibly via an inline function...

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)