Question

I have some c(++) code that uses sprintf to convert a uint_64 to a string. This needs to be portable to both linux and Solaris.

On linux we use %ju, but there does not appear to be any equivalent on Solaris. The closest I can find is %lu, but this produces incorrect output. Some sample code:

#include <stdio.h> #include <sys/types.h>  #ifdef SunOS typedef uint64_t u_int64_t; #endif  int main(int argc, char **argv) {     u_int64_t val = 123456789123L;  #ifdef SunOS     printf('%lu\n', val); #else     printf('%ju\n', val); #endif } 

On linux, the output is as expected; on Solaris 9 (don’t ask), it’s ’28’

What can I use?

Answer 1

If you have have inttypes.h available you can use the macros it provides:

printf(  '%' PRIu64 '\n', val); 

Not pretty (I seem to be saying that a lot recently), but it works.