GSFORTH-ROM/string.txt at master · perfectconsulting/GSFORTH-ROM · GitHub

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vocabulary string
string definitions decimal

: $variable ( n -- ccc )
		<builds dup c, 0 c, here swap dup  allot blanks does> 1+ ;

: $maxlen ( $ -- n )
		1- c@ ;

: $len ( $ -- n )
		c@ ;

: $. ( $ -- )
	count type ;

: $empty ( $ -- )
	  0 swap c! ;

: $empty? ( $ -- f )
		$len 0 = ;

: $end ( $ -- a )
		dup c@ swap 1+ + ;

: #$! ( a n $ -- )
		over over ( a n $ n $ -- )
		$maxlen
    > 0 ?error
    swap >a  dup a@ swap c! 1+ a> cmove ;

: $! ( $from $to -- )
		>a dup $len swap 1+ swap a> #$! ;
		( over over $maxlen swap $len  <  0 ?error over $len 1+ cmove  ;		)

: #$+! ( a n  $ -- )
		dup >a over over
		$len + dup >a
		over $maxlen > 0 ?error
		$end swap cmove a> a> c! ;

5 $variable five
10 $variable ten

forth definitions