Stringification of a macro value
- by SF.
I faced a problem - I need to use a macro value both as string and as integer.
#define RECORDS_PER_PAGE 10
/*... */
#define REQUEST_RECORDS \
"SELECT Fields FROM Table WHERE Conditions" \
" OFFSET %d * " #RECORDS_PER_PAGE \
" LIMIT " #RECORDS_PER_PAGE ";"
char result_buffer[RECORDS_PER_PAGE][MAX_RECORD_LEN];
/* ...and some more uses of RECORDS_PER_PAGE, elsewhere... */
This fails with a message about "stray #", and even if it worked, I guess I'd get the macro names stringified, not the values. Of course I can feed the values to the final method ( "LIMIT %d ", page*RECORDS_PER_PAGE ) but it's neither pretty nor efficient.
It's times like this when I wish the preprocessor didn't treat strings in a special way and would process their content just like normal code.
For now, I cludged it with #define RECORDS_PER_PAGE_TXT "10" but understandably, I'm not happy about it.
How to get it right?
