fmt_plusminus(3) - Linux man page
Name
fmt_plusminus - write '+' or '-'Syntax
#include <fmt.h>size_t fmt_plusminus(char *dest,signed int source);
Description
fmt_plusminus writes '-' to dest if source is negative, '+' if source is positive, nothing otherwise. It returns the number of bytes written.fmt_plusminus does not append \0.
If dest equals FMT_LEN (i.e. is zero), fmt_plusminus returns the number of bytes it would have written.