Re: Binary scanner not matching character ranges

[Hans Aberg]

Should your rules be "\xff\xfb." or "\xff\xfb". (etc.)? Is the 8-bit scanner
option on?

On 2004/12/17 21:42, Shaun Jackman at address@hidden wrote:

> I'm writing a binary scanner for the Telnet protocol, which is deadly
> simple. The escape sequence 0xff preceeds a two or three byte command,
> and everything else is a normal character. The rule explicit
> "\xff\xec" is matching, but all the rules with a '.' in them are not
> matching. For example, the input sequence 0xff 0xfd 0x03 is being
> matched by the last rule three times, rather than the fourth rule,
> "\xff\xfd.". I've tried using character ranges instead, like
> [\x00-\xff], but I'm not having any luck.
> 
> "\xff\xec" return xEOF;
> "\xff\xfb." yylval = yytext[2]; return WILL;
> "\xff\xfc." yylval = yytext[2]; return WONT;
> "\xff\xfd." yylval = yytext[2]; return DO;
> "\xff\xfe." yylval = yytext[2]; return DONT;
> "\xff\xff" return 255;
> "\xff." yylval = yytext[1]; return IAC;
> . return yytext[0];
> 
> Please cc me in your reply. Thanks,
> Shaun
> 
> 
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