Re: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ?

[Chris Kuethe]

#include <stdio.h>

int main(){
        char *m = "try use \x68\x65\x78\x20\x65\x73\x63\x61\x70\x65\x73\x3f";

        printf("%s\n", m);
        return 0;
}

On Wed, Feb 4, 2009 at 11:58 PM, David Brown <address@hidden> wrote:
> Vincent Trouilliez wrote:
>>
>> On Thu, 5 Feb 2009 15:18:44 +1030
>> "Daniel O'Connor" <address@hidden> wrote:
>>
>>> You can define it like so..
>>> #define  LCD_CUSTOM_CHAR_FOO "\012"
>>>
>>> then you can do..
>>> char example[] = "foo" LCD_CUSTOM_CHAR_FOO "bar";
>>>
>>> You might be able to do something more clever but I don't know how :)
>>
>>
>> Thanks Daniel (and Ivan as well, off-list), that worked a treat ! :-)
>>
>> Only drawback I found, is that I must now have TWO #defines for each and
>> every custom character: one #define to represent the character as a
>> string, so I can embed it into a string, and also all the #defines I
>> already had, which represent the actual numerical value, for when I
>> need to print an individual/discrete character rather than print a
>> string. It's not the end of the world, but not very elegant either, so
>> if anybody has a solution to make do with only one define per character,
>> I am all ears ;-)
>>
>
> An alternative idea is to find an ASCII character that you don't need
> otherwise (say, "~"), and use it in your strings.  Then do on-the-fly
> conversion when outputing the strings:
>
> char example[] = "foo~bar";
>
> void lcdWriteString(const char* p) {
>        while (char c = *p++) {
>                if (c == '~') {
>                        lcdWriteChar(LCD_CUSTOM_CHAR_FOO);
>                } else {
>                        lcdWriteChar(c);
>                }
>        }
> }
>
> As long as you don't have too many, the overhead won't be bad (and the
> substitute characters won't be too confusing).  It should also work with
> characters >= 128 as the substitutes, I believe.
>
>
>
>
>
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-- 
GDB has a 'break' feature; why doesn't it have 'fix' too?