I'm wondering what behavior is expected for the following program on
a machine with 32-bit int's and 64-bit long's:
#include <stdio.h>
int main(void)
{
long n = -1;
snprintf (NULL, 0, "%100000000000s%ln", "", &n);
printf ("%ld\n", n);
return 0;
}
i.e. in case of overflow on the return value (which occurs here since
snprintf should have returned 100000000000, but this value doesn't fit
in an int), what should the effect be?
If there is output to a file or a buffer, should this be done, and the
only effect of the overflow concerns the return value?
For the 'n' format specifier (as in the above program), are the
objects expected to be filled? If not, do they contain their old
values or are their contents unspecified?
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Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
