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