; strings.h interface specification for strings package

; Written to support code extracted from the second example distributed with
; the Jun. 28, 2018 notes.

;   Uses the standard Hawk linkage conventions:
;     R1 -- used for linkage by all support routines.
;     R2 -- typically used internally as an activation record pointer.
;     R3 -- typically the first parameter and function return value
;     R4 -- typically the second parameter, if there is one.

	EXT	STRLEN	; compute the length of a string
		        ;   expects R3 = s,   a pointer to a string
			;   returns R3        the length of s
			;   wipes out R4, R5

	EXT	STRCPY	; copy null terminated string src to dst"
			;   expects R3 = dst, a pointer to an empty buffer
			;           R4 = src, a pointer to a source string
			;   returns R3        unchanged
			;   wipes out R4 to R7

	END