Does Posix supply format string macros for printf/scanf?

Question

The printf and scanf families of functions in C consume a handful of primitive format specifiers that correspond to the fundamental data types –

Answer 1

The sfio package (part of AT&T Labs' open source AST software) has functions analogous to printf and scanf which let you specify the size of the numeric value (typically using sizeof()) as an additional parameter. Some examples:

sfprintf(sfstdout, "%I*d", sizeof(intval), intval);
sfscanf(sfstdin, "%I*f", sizeof(fltval), &fltval);

USENIX paper: Extended Data Formatting Using Sfio .