Re: [Sdcc-user] ESC Seq.

[THOMAS C. <VCECMP.CHEFTH@MEMO.VOLVO.SE>]

--- Inkommet från VCECMP.CHEFTH +46 16 151241           00-11-28 08:04

>From: mic...@ve...
>To: VCECMP.CHEFTH@MEMO.VOLVO.SE
>Date: Mon, 27 Nov 2000 08:33:04 -0800
>Subject: Re: [Sdcc-user] ESC Seq.
>
>Not when it is part of a string...0x041 is treated as a literal.
>
Hello again !

I have borrowed something out of a ANSI-C Compiler manual:

Escape Sequences
Character combinations consisting of a backslash (\) followed by a
letter or by a combination of digits are called "escape sequences." To
represent a newline character, single quotation mark, or certain other
characters in a character constant, you must use escape sequences. An
escape sequence is regarded as a single character and is therefore
valid as a character constant.

\xhhh
 ASCII character in hexadecimal notation

All normal escape codes listed in Character Constants are valid in
string constants.
 ----------------------End------------------------
I have also hade some testing and found out that if i use the
following notation it works ! (though not ANSI)
code unsigned char * code test="QW\0x041 QW";
If I remove the following whitespace or the trailing 0(zero) it
doesn't work.

If you look in the SDCCVal.c-file it uses:
sscanf(s,"%x",&SPEC_CVAL(val->type).v_int);
to find out the value of the escape-sequence.

/ Thomas

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