49 lines
1006 B
NASM
49 lines
1006 B
NASM
|
; Expect at least one whitespace (0x20, 0x09) at (HL), and then advance HL
|
||
|
|
; until a non-whitespace character is met.
|
||
|
|
; HL is advanced to the first non-whitespace char.
|
||
|
|
; Sets Z on success, unset on failure.
|
||
|
|
; Failure is either not having a first whitespace or reaching the end of the
|
||
|
|
; string.
|
||
|
|
; Sets Z if we found a non-whitespace char, unset if we found the end of string.
|
||
|
|
rdWS:
|
||
|
|
ld a, (hl)
|
||
|
|
call isSep
|
||
|
|
ret nz ; failure
|
||
|
|
.loop:
|
||
|
|
inc hl
|
||
|
|
ld a, (hl)
|
||
|
|
call isSep
|
||
|
|
jr z, .loop
|
||
|
|
or a ; cp 0
|
||
|
|
jp z, .fail
|
||
|
|
cp a ; ensure Z
|
||
|
|
ret
|
||
|
|
.fail:
|
||
|
|
; A is zero at this point
|
||
|
|
inc a ; unset Z
|
||
|
|
ret
|
||
|
|
|
||
|
|
; Find the first whitespace in (HL) and returns its index in A
|
||
|
|
; Sets Z if whitespace is found, unset if end of string was found.
|
||
|
|
; In the case where no whitespace was found, A returns the length of the string.
|
||
|
|
fnWSIdx:
|
||
|
|
push hl
|
||
|
|
push bc
|
||
|
|
ld b, 0
|
||
|
|
.loop:
|
||
|
|
ld a, (hl)
|
||
|
|
call isSep
|
||
|
|
jr z, .found
|
||
|
|
or a
|
||
|
|
jr z, .eos
|
||
|
|
inc hl
|
||
|
|
inc b
|
||
|
|
jr .loop
|
||
|
|
.eos:
|
||
|
|
inc a ; unset Z
|
||
|
|
.found: ; Z already set from isSep
|
||
|
|
ld a, b
|
||
|
|
pop bc
|
||
|
|
pop hl
|
||
|
|
ret
|