man fmt_minus (3): write '-' for negative integers

SYNTAX

#include <fmt.h>

size_t fmt_minus(char *dest,signed int source);

fmt_minus writes '-' if source is negative, nothing otherwise. It returns the number of bytes written.

fmt_minus does not append \0.

If dest equals FMT_LEN (i.e. is zero), fmt_minus returns the number of bytes it would have written.