strtabify(3)
convert runs of spaces and tabs to tabs
SYNOPSIS
#include <publib.h>
char *strtabify(char *str, size_t tabsize);
DESCRIPTION
strtabify will converts spaces and tabs to tabs and spaces (using
the minimal amount of spaces required, possibly none), while preserving
indentation. Tab positions are set every tabsize columns.
RETURN VALUE
strtabify will return its first argument.