#include <stdio.h>
#include "tools.h"

/*	Expand the set pointed to by *src into dest.
 *	Stop at delim.  Return 0 on error or size of
 *	character class on success.  Update *src to
 *	point at delim.  A set can have one element
 *	{x} or several elements ( {abcdefghijklmnopqrstuvwxyz}
 *	and {a-z} are equivalent ).  Note that the dash
 *	notation is expanded as sequential numbers.
 *	This means (since we are using the ASCII character
 *	set) that a-Z will contain the entire alphabet
 *	plus the symbols: [\]^_`.  The maximum number of
 *	characters in a character class is defined by maxccl.
 */
char *
dodash(delim, src, map)

int	delim;
char	*src, *map;
{

	register int	first,	last;
	char		*start;

	start = src;

	while( *src && *src != delim )
	{
		if( *src != '-')
			setbit( esc( &src ), map, 1 );

		else if( src == start || *(src + 1) == delim )
			setbit( '-', map, 1 );
		else {
			src++;

			if( *src < *(src - 2))
			{
				first = *src;
				last = *(src - 2);
			} else {
				first = *(src - 2);
				last = *src;
			}

			while( ++first <= last )
				setbit( first, map, 1);

		}
		src++;
	}
	return( src );
}