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#asm
;
;------------------------------------------------------------------
;       Small-C  Run-time Librray
;
;       V4d     As of July 16, 1980 (gtf)
;                  Added EXIT() function
;------------------------------------------------------------------
;
;Fetch a single byte from the address in HL and sign extend into HL
ccgchar:
        ld a,(hl)
ccsxt:
        ld l,a
        rlca
        sbc     a
        ld      h,a
        ret
;Fetch a full 16-bit integer from the address in HL
ccgint:
        ld a,(hl)
        inc     hl
        ld      h,(hl)
        ld l,a
        ret
;Store a single byte from HL at the address in DE
ccpchar:
        ld      a,l
        ld      (de),a
        ret
;Store a 16-bit integer in HL at the address in DE
ccpint:
        ld      a,l
        ld      (de),a
        inc     de
        ld      a,h
        ld      (de),a
        ret
;Inclusive "or" HL and DE into HL
ccor:
        ld      a,l
        or      e
        ld l,a
        ld      a,h
        or      d
        ld      h,a
        ret
;Exclusive "or" HL and DE into HL
ccxor:
        ld      a,l
        xor     e
        ld l,a
        ld      a,h
        xor     d
        ld      h,a
        ret
;"And" HL and DE into HL
ccand:
        ld      a,l
        and     e
        ld l,a
        ld      a,h
        and     d
        ld      h,a
        ret
;Test if HL = DE and set HL = 1 if true else 0
cceq:
        call cccmp
        ret z
        dec     hl
        ret
;Test if DE ~= HL
ccne:
        call cccmp
        ret nz
        dec     hl
        ret
;Test if DE > HL (signed)
ccgt:
        ex de,hl
        call cccmp
        ret c
        dec     hl
        ret
;Test if DE <= HL (signed)
ccle:
        call cccmp
        ret z
        ret c
        dec hl
        ret
;Test if DE >= HL (signed)
ccge:
        call cccmp
        ret nc
        dec hl
        ret
;Test if DE < HL (signed)
cclt:
        call cccmp
        ret c
        dec hl
        ret
; Signed compare of DE and HL
; Performs DE - HL and sets the conditions:
;       Carry reflects sign of difference (set means DE < HL)
;       Zero/non-zero set according to equality.
cccmp:
        ld      a,e
        sub     l
        ld      e,a
        ld      a,d
        sbc     h
        ld      hl,1
        jp      m,cccmp1
        or      e       ;"OR" resets carry
        ret
cccmp1:
        or      e
        scf             ;set carry to signal minus
        ret
;Test if DE >= HL (unsigned)
ccuge:
        call ccucmp
        ret nc
        dec hl
        ret
;Test if DE < HL (unsigned)
ccult:
        call ccucmp
        ret c
        dec hl
        ret
;Test if DE > HL (unsigned)
ccugt:
        ex de,hl
        call ccucmp
        ret c
        dec hl
        ret
;Test if DE <= HL (unsigned)
ccule:
        call ccucmp
        ret z
        ret c
        dec hl
        ret
;Routine to perform unsigned compare
;carry set if DE < HL
;zero/nonzero set accordingly
ccucmp:
        ld      a,d
        cp      h
        jp      nz,$+5
        ld      a,e
        cp      l
        ld      hl,1
        ret
;Shift DE arithmetically right by HL and return in HL
ccasr:
        ex      de,hl
        ld      a,h
        rla
        ld      a,h
        rra
        ld      h,a
        ld      a,l
        rra
        ld      l,a
        dec     e
        jp      nz,ccasr+1
        ret
;Shift DE arithmetically left by HL and return in HL
ccasl:
        ex      de,hl
        add     hl,hl
        dec     e
        jp      nz,ccasl+1
        ret
;Subtract HL from DE and return in HL
ccsub:
        ld      a,e
        sub     l
        ld l,a
        ld      a,d
        sbc     h
        ld      h,a
        ret
;Form the two's complement of HL
ccneg:
        call cccom
        inc     hl
        ret
;Form the one's complement of HL
cccom:
        ld      a,h
        cpl
        ld      h,a
        ld      a,l
        cpl
        ld l,a
        ret
;Multiply DE by HL and return in HL
ccmult:
        ld      b,h
        ld      c,l
        ld      hl,0
ccmult1:
        ld      a,c
        rrca
        jp      nc,$+4
        add     hl,de
        xor     a
        ld      a,b
        rra
        ld      b,a
        ld      a,c
        rra
        ld      c,a
        or      b
        ret z
        xor     a
        ld      a,e
        rla
        ld      e,a
        ld      a,d
        rla
        ld      d,a
        or      e
        ret z
        jp      ccmult1
;Divide DE by HL and return quotient in HL, remainder in DE
ccdiv:
        ld      b,h
        ld      c,l
        ld      a,d
        xor     b
        push af
        ld      a,d
        or      a
        call m,ccdeneg
        ld      a,b
        or      a
        call m,ccbcneg
        ld      a,16
        push af
        ex      de,hl
        ld      de,0
ccdiv1:
        add hl,hl
        call ccrdel
        jp      z,ccdiv2
        call cccmpbcde
        jp      m,ccdiv2
        ld      a,l
        or      1
        ld l,a
        ld      a,e
        sub     c
        ld      e,a
        ld      a,d
        sbc     b
        ld      d,a
ccdiv2:
        pop af
        dec     a
        jp      z,ccdiv3
        push af
        jp      ccdiv1
ccdiv3:
        pop af
        ret     p
        call ccdeneg
        ex de,hl
        call ccdeneg
        ex de,hl
        ret
ccdeneg:
        ld      a,d
        cpl
        ld      d,a
        ld      a,e
        cpl
        ld      e,a
        inc     de
        ret
ccbcneg:
        ld      a,b
        cpl
        ld      b,a
        ld      a,c
        cpl
        ld      c,a
        inc     bc
        ret
ccrdel:
        ld      a,e
        rla
        ld      e,a
        ld      a,d
        rla
        ld      d,a
        or      e
        ret
cccmpbcde:
        ld      a,e
        sub     c
        ld      a,d
        sbc     b
        ret
#endasm

Line No.	Rev	Author	Line
1	65	motilito	`#asm`
2			`;`
3			`;------------------------------------------------------------------`
4			`; Small-C Run-time Librray`
5			`;`
6			`; V4d As of July 16, 1980 (gtf)`
7			`; Added EXIT() function`
8			`;------------------------------------------------------------------`
9			`;`
10			`;Fetch a single byte from the address in HL and sign extend into HL`
11			`ccgchar:`
12			`ld a,(hl)`
13			`ccsxt:`
14			`ld l,a`
15			`rlca`
16			`sbc a`
17			`ld h,a`
18			`ret`
19			`;Fetch a full 16-bit integer from the address in HL`
20			`ccgint:`
21			`ld a,(hl)`
22			`inc hl`
23			`ld h,(hl)`
24			`ld l,a`
25			`ret`
26			`;Store a single byte from HL at the address in DE`
27			`ccpchar:`
28			`ld a,l`
29			`ld (de),a`
30			`ret`
31			`;Store a 16-bit integer in HL at the address in DE`
32			`ccpint:`
33			`ld a,l`
34			`ld (de),a`
35			`inc de`
36			`ld a,h`
37			`ld (de),a`
38			`ret`
39			`;Inclusive "or" HL and DE into HL`
40			`ccor:`
41			`ld a,l`
42			`or e`
43			`ld l,a`
44			`ld a,h`
45			`or d`
46			`ld h,a`
47			`ret`
48			`;Exclusive "or" HL and DE into HL`
49			`ccxor:`
50			`ld a,l`
51			`xor e`
52			`ld l,a`
53			`ld a,h`
54			`xor d`
55			`ld h,a`
56			`ret`
57			`;"And" HL and DE into HL`
58			`ccand:`
59			`ld a,l`
60			`and e`
61			`ld l,a`
62			`ld a,h`
63			`and d`
64			`ld h,a`
65			`ret`
66			`;Test if HL = DE and set HL = 1 if true else 0`
67			`cceq:`
68			`call cccmp`
69			`ret z`
70			`dec hl`
71			`ret`
72			`;Test if DE ~= HL`
73			`ccne:`
74			`call cccmp`
75			`ret nz`
76			`dec hl`
77			`ret`
78			`;Test if DE > HL (signed)`
79			`ccgt:`
80			`ex de,hl`
81			`call cccmp`
82			`ret c`
83			`dec hl`
84			`ret`
85			`;Test if DE <= HL (signed)`
86			`ccle:`
87			`call cccmp`
88			`ret z`
89			`ret c`
90			`dec hl`
91			`ret`
92			`;Test if DE >= HL (signed)`
93			`ccge:`
94			`call cccmp`
95			`ret nc`
96			`dec hl`
97			`ret`
98			`;Test if DE < HL (signed)`
99			`cclt:`
100			`call cccmp`
101			`ret c`
102			`dec hl`
103			`ret`
104			`; Signed compare of DE and HL`
105			`; Performs DE - HL and sets the conditions:`
106			`; Carry reflects sign of difference (set means DE < HL)`
107			`; Zero/non-zero set according to equality.`
108			`cccmp:`
109			`ld a,e`
110			`sub l`
111			`ld e,a`
112			`ld a,d`
113			`sbc h`
114			`ld hl,1`
115			`jp m,cccmp1`
116			`or e ;"OR" resets carry`
117			`ret`
118			`cccmp1:`
119			`or e`
120			`scf ;set carry to signal minus`
121			`ret`
122			`;Test if DE >= HL (unsigned)`
123			`ccuge:`
124			`call ccucmp`
125			`ret nc`
126			`dec hl`
127			`ret`
128			`;Test if DE < HL (unsigned)`
129			`ccult:`
130			`call ccucmp`
131			`ret c`
132			`dec hl`
133			`ret`
134			`;Test if DE > HL (unsigned)`
135			`ccugt:`
136			`ex de,hl`
137			`call ccucmp`
138			`ret c`
139			`dec hl`
140			`ret`
141			`;Test if DE <= HL (unsigned)`
142			`ccule:`
143			`call ccucmp`
144			`ret z`
145			`ret c`
146			`dec hl`
147			`ret`
148			`;Routine to perform unsigned compare`
149			`;carry set if DE < HL`
150			`;zero/nonzero set accordingly`
151			`ccucmp:`
152			`ld a,d`
153			`cp h`
154			`jp nz,$+5`
155			`ld a,e`
156			`cp l`
157			`ld hl,1`
158			`ret`
159			`;Shift DE arithmetically right by HL and return in HL`
160			`ccasr:`
161			`ex de,hl`
162			`ld a,h`
163			`rla`
164			`ld a,h`
165			`rra`
166			`ld h,a`
167			`ld a,l`
168			`rra`
169			`ld l,a`
170			`dec e`
171			`jp nz,ccasr+1`
172			`ret`
173			`;Shift DE arithmetically left by HL and return in HL`
174			`ccasl:`
175			`ex de,hl`
176			`add hl,hl`
177			`dec e`
178			`jp nz,ccasl+1`
179			`ret`
180			`;Subtract HL from DE and return in HL`
181			`ccsub:`
182			`ld a,e`
183			`sub l`
184			`ld l,a`
185			`ld a,d`
186			`sbc h`
187			`ld h,a`
188			`ret`
189			`;Form the two's complement of HL`
190			`ccneg:`
191			`call cccom`
192			`inc hl`
193			`ret`
194			`;Form the one's complement of HL`
195			`cccom:`
196			`ld a,h`
197			`cpl`
198			`ld h,a`
199			`ld a,l`
200			`cpl`
201			`ld l,a`
202			`ret`
203			`;Multiply DE by HL and return in HL`
204			`ccmult:`
205			`ld b,h`
206			`ld c,l`
207			`ld hl,0`
208			`ccmult1:`
209			`ld a,c`
210			`rrca`
211			`jp nc,$+4`
212			`add hl,de`
213			`xor a`
214			`ld a,b`
215			`rra`
216			`ld b,a`
217			`ld a,c`
218			`rra`
219			`ld c,a`
220			`or b`
221			`ret z`
222			`xor a`
223			`ld a,e`
224			`rla`
225			`ld e,a`
226			`ld a,d`
227			`rla`
228			`ld d,a`
229			`or e`
230			`ret z`
231			`jp ccmult1`
232			`;Divide DE by HL and return quotient in HL, remainder in DE`
233			`ccdiv:`
234			`ld b,h`
235			`ld c,l`
236			`ld a,d`
237			`xor b`
238			`push af`
239			`ld a,d`
240			`or a`
241			`call m,ccdeneg`
242			`ld a,b`
243			`or a`
244			`call m,ccbcneg`
245			`ld a,16`
246			`push af`
247			`ex de,hl`
248			`ld de,0`
249			`ccdiv1:`
250			`add hl,hl`
251			`call ccrdel`
252			`jp z,ccdiv2`
253			`call cccmpbcde`
254			`jp m,ccdiv2`
255			`ld a,l`
256			`or 1`
257			`ld l,a`
258			`ld a,e`
259			`sub c`
260			`ld e,a`
261			`ld a,d`
262			`sbc b`
263			`ld d,a`
264			`ccdiv2:`
265			`pop af`
266			`dec a`
267			`jp z,ccdiv3`
268			`push af`
269			`jp ccdiv1`
270			`ccdiv3:`
271			`pop af`
272			`ret p`
273			`call ccdeneg`
274			`ex de,hl`
275			`call ccdeneg`
276			`ex de,hl`
277			`ret`
278			`ccdeneg:`
279			`ld a,d`
280			`cpl`
281			`ld d,a`
282			`ld a,e`
283			`cpl`
284			`ld e,a`
285			`inc de`
286			`ret`
287			`ccbcneg:`
288			`ld a,b`
289			`cpl`
290			`ld b,a`
291			`ld a,c`
292			`cpl`
293			`ld c,a`
294			`inc bc`
295			`ret`
296			`ccrdel:`
297			`ld a,e`
298			`rla`
299			`ld e,a`
300			`ld a,d`
301			`rla`
302			`ld d,a`
303			`or e`
304			`ret`
305			`cccmpbcde:`
306			`ld a,e`
307			`sub c`
308			`ld a,d`
309			`sbc b`
310			`ret`
311			`#endasm`

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