man mchartable_range () - Search for characters that have non-default value.
NAME
mchartable_range - Search for characters that have non-default value.
SYNOPSIS
void mchartable_range (MCharTable * table, int * from, int * to)
DESCRIPTION
The mchartable_range() function searches chartable table for the first and the last character codes that do not have the default value of table, and set from and to to them, respectively. If all characters have the default value, both from and to are set to -1.