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| 1 | + .page |
| 2 | + .subttl Array Routines |
| 3 | + |
| 4 | +; |
| 5 | +; format of arrays in core: |
| 6 | +; |
| 7 | +; descriptor: |
| 8 | +; lowbyte = first character. |
| 9 | +; high byte = second character (m.s.bit is string flag). |
| 10 | +; length of array in core in bytes (includes everything). |
| 11 | +; number of dimensions. |
| 12 | +; for each dimension starting with the first a list (2 bytes each) |
| 13 | +; of the max indice+1 |
| 14 | +; the values |
| 15 | +; |
| 16 | + |
| 17 | + |
| 18 | +is_array |
| 19 | + lda dimflg |
| 20 | + ora intflg |
| 21 | + pha ;save (dimflg) for recursion. |
| 22 | + lda valtyp |
| 23 | + pha ;save (valtyp) for recursion. |
| 24 | + ldy #0 ;set number of dimensions to zero. |
| 25 | + |
| 26 | +indlop tya ;save number of dims. |
| 27 | + pha |
| 28 | + lda varnam+1 |
| 29 | + pha |
| 30 | + lda varnam |
| 31 | + pha ;save looks. |
| 32 | + jsr intidx ;evaluate indice into facmo&lo. |
| 33 | + pla |
| 34 | + sta varnam |
| 35 | + pla |
| 36 | + sta varnam+1 ;get back all...we're home. |
| 37 | + pla ;(# of units). |
| 38 | + tay |
| 39 | + tsx |
| 40 | + lda 258,x |
| 41 | + pha ;push dimflg and valtyp further. |
| 42 | + lda 257,x |
| 43 | + pha |
| 44 | + lda indice ;put indice onto stack. |
| 45 | + sta 258,x ;under dimflg and valtyp. |
| 46 | + lda indice+1 |
| 47 | + sta 257,x |
| 48 | + iny ;y counts # of subscripts |
| 49 | + sty count ;protect y from chrget |
| 50 | + jsr chrgot ;get terminating character. |
| 51 | + ldy count |
| 52 | + cmp #',' ;more subscripts? |
| 53 | + beq indlop ;yes. |
| 54 | + |
| 55 | + jsr chkcls ;must be closed paren. |
| 56 | + pla |
| 57 | + sta valtyp ;get valtyp and |
| 58 | + pla |
| 59 | + sta intflg |
| 60 | + and #$7f |
| 61 | + sta dimflg ;dimflg off stack. |
| 62 | + ldx arytab ;place to start search. |
| 63 | + lda arytab+1 |
| 64 | +lopfda |
| 65 | + stx lowtr |
| 66 | + sta lowtr+1 |
| 67 | + cmp strend+1 ;end of arrays? |
| 68 | + bne lopfdv |
| 69 | + cpx strend |
| 70 | + beq notfdd ;a fine thing! no array! |
| 71 | +lopfdv |
| 72 | + ldy #0 |
| 73 | + jsr indlow_ram1 ;get high of name from array bank (ram1) |
| 74 | + iny |
| 75 | + cmp varnam ;compare high orders. |
| 76 | + bne nmary1 ;no way is it this. get the bite outta here. |
| 77 | + jsr indlow_ram1 |
| 78 | + cmp varnam+1 ;low orders? |
| 79 | + beq gotary ;well here it is. |
| 80 | +nmary1 |
| 81 | + iny |
| 82 | + jsr indlow_ram1 ;get length. |
| 83 | + clc |
| 84 | + adc lowtr |
| 85 | + tax |
| 86 | + iny |
| 87 | + jsr indlow_ram1 |
| 88 | + adc lowtr+1 |
| 89 | + bcc lopfda ;always branches. |
| 90 | +bserr ldx #errbs ;get bad sub error number. |
| 91 | + .byte $2c |
| 92 | + |
| 93 | +fcerr ldx #errfc ;too big. Illegal Quantity error |
| 94 | +errgo3 jmp error |
| 95 | + |
| 96 | + |
| 97 | + |
| 98 | +gotary ldx #errdd ;perhaps a "re-dimension" error. |
| 99 | + lda dimflg ;test the dimflg. |
| 100 | + bne errgo3 |
| 101 | + jsr fmaptr |
| 102 | + ldy #4 |
| 103 | + jsr indlow_ram1 |
| 104 | + sta syntmp |
| 105 | + lda count ;get number of dims input. |
| 106 | + cmp syntmp ;# of dims the same? |
| 107 | + bne bserr ;same so get definition. |
| 108 | + jmp getdef |
| 109 | + .page |
| 110 | +; |
| 111 | +; here when variable is not found in the array table. |
| 112 | +; |
| 113 | +; building an entry. |
| 114 | +; |
| 115 | +; put down the descriptor. |
| 116 | +; setup number of dimensions. |
| 117 | +; make sure there is room for the new entry. |
| 118 | +; remember "varpnt". |
| 119 | +; tally=4. |
| 120 | +; skip two locs for later fill in of size. |
| 121 | +; loop: get an indice |
| 122 | +; put down number+1 and increment varptr. |
| 123 | +; tally=tally*number+1 |
| 124 | +; decrement number of dims |
| 125 | +; bne loop |
| 126 | +; call "reason" with (a,b) reflecting last loc |
| 127 | +; of variable |
| 128 | +; update strend |
| 129 | +; zero all. |
| 130 | +; make tally include maxdims and descriptor |
| 131 | +; put down tally |
| 132 | +; if called by dimension, return. |
| 133 | +; otherwise index into the variable as if it |
| 134 | +; were found on the initial search. |
| 135 | +; |
| 136 | +notfdd |
| 137 | + jsr fmaptr ;form arypnt. |
| 138 | + jsr reason |
| 139 | + ldy #0 |
| 140 | + sty curtol+1 |
| 141 | + ldx #5 |
| 142 | + lda varnam |
| 143 | + sta sw_rom_ram1 ;point to string/array bank |
| 144 | + sta (lowtr),y |
| 145 | + bpl notflt |
| 146 | + dex |
| 147 | +notflt |
| 148 | + iny |
| 149 | + lda varnam+1 |
| 150 | + sta (lowtr),y |
| 151 | + bpl stomlt |
| 152 | + dex |
| 153 | + dex |
| 154 | +stomlt |
| 155 | + stx curtol |
| 156 | + lda count |
| 157 | + iny |
| 158 | + iny |
| 159 | + iny |
| 160 | + sta (lowtr),y ;save number of dimensions. |
| 161 | +loppta |
| 162 | + ldx #11 ;default size. |
| 163 | + lda #0 |
| 164 | + bit dimflg |
| 165 | + bvc notdim ;not in a dim statement. |
| 166 | + pla ;get low order of indice. |
| 167 | + clc |
| 168 | + adc #1 |
| 169 | + tax |
| 170 | + pla ;get high order of indice. |
| 171 | + adc #0 |
| 172 | +notdim |
| 173 | + iny |
| 174 | + sta (lowtr),y ;store high part of indice. |
| 175 | + iny |
| 176 | + txa |
| 177 | + sta (lowtr),y ;store low part of indice. |
| 178 | + jsr umult ;(a,x)+(curtol)*(lowtr,y). |
| 179 | + stx curtol ;save new tally. |
| 180 | + sta curtol+1 |
| 181 | + ldy index |
| 182 | + dec count ;any more indices left? |
| 183 | + bne loppta ;yes. |
| 184 | + adc arypnt+1 |
| 185 | + bcs omerr1 ;overflow. |
| 186 | + sta arypnt+1 ;compute where to zero. |
| 187 | + tay |
| 188 | + txa |
| 189 | + adc arypnt |
| 190 | + bcc grease |
| 191 | + iny |
| 192 | + beq omerr1 |
| 193 | +grease |
| 194 | + jsr reason ;get room. |
| 195 | + sta strend |
| 196 | + sty strend+1 ;new end of storage. |
| 197 | + lda #0 ;storing (acca) is faster than clear. |
| 198 | + inc curtol+1 |
| 199 | + |
| 200 | + ldy curtol |
| 201 | + beq deccur |
| 202 | + |
| 203 | +zerita dey ;zero out new entry |
| 204 | + sta (arypnt),y |
| 205 | + bne zerita ;no. continue. |
| 206 | +deccur |
| 207 | + dec arypnt+1 |
| 208 | + dec curtol+1 |
| 209 | + bne zerita ;do another block. |
| 210 | + inc arypnt+1 ;bump back up. will use later. |
| 211 | + sec |
| 212 | + lda strend ;restore (acca). |
| 213 | + sbc lowtr ;determine length. |
| 214 | + ldy #2 |
| 215 | + sta (lowtr),y ;low. |
| 216 | + lda strend+1 |
| 217 | + iny |
| 218 | + sbc lowtr+1 |
| 219 | + sta (lowtr),y ;high. |
| 220 | + lda dimflg ;quit here if this is a dim statement |
| 221 | + bne dimrts ;bye! |
| 222 | + iny |
| 223 | + |
| 224 | + |
| 225 | +; At this point (lowtr,y) points beyond the size to the number of dimensions. strategy: |
| 226 | +; numdim=number of dimensions. |
| 227 | +; curtol=0. |
| 228 | +;inlpnm:get a new indice. |
| 229 | +; make sure indice is not too big. |
| 230 | +; multiply curtol by curmax. |
| 231 | +; add indice to curtol. |
| 232 | +; numdim=numdim-1. |
| 233 | +; bne inlpnm. |
| 234 | +; use (curtol)*4 as offset. |
| 235 | + |
| 236 | +getdef jsr indlow_ram1 ;get # of dim's from ram bank 1 |
| 237 | + sta count ;save a counter. |
| 238 | + lda #0 ;zero (curtol). |
| 239 | + sta curtol |
| 240 | +inlpnm |
| 241 | + sta curtol+1 |
| 242 | + iny |
| 243 | + pla ;get low indice. |
| 244 | + tax |
| 245 | + sta indice |
| 246 | + jsr indlow_ram1 |
| 247 | + sta syntmp |
| 248 | + pla ;and the high part. |
| 249 | + sta indice+1 |
| 250 | + cmp syntmp ;compare with max indice. |
| 251 | + bcc inlpn2 |
| 252 | + bne bserr7 ;if greater, "bad subscript" error. |
| 253 | + iny |
| 254 | + jsr indlow_ram1 |
| 255 | + sta syntmp |
| 256 | + cpx syntmp |
| 257 | + bcc inlpn1 |
| 258 | + |
| 259 | +bserr7 jmp bserr |
| 260 | + |
| 261 | +omerr1 jmp omerr |
| 262 | + |
| 263 | +inlpn2 |
| 264 | + iny |
| 265 | +inlpn1 lda curtol+1 ;don't multiply if curtol=0. |
| 266 | + ora curtol |
| 267 | + clc ;prepare to get indice back. |
| 268 | + beq addind ;get high part of indice back. |
| 269 | + jsr umult ;multiply (curtol) by (5&6,lowtr). |
| 270 | + txa |
| 271 | + adc indice ;add in (indice). |
| 272 | + tax |
| 273 | + tya |
| 274 | + ldy index1 |
| 275 | +addind |
| 276 | + adc indice+1 |
| 277 | + stx curtol |
| 278 | + dec count ;any more? |
| 279 | + bne inlpnm ;yes. |
| 280 | + sta curtol+1 |
| 281 | + ldx #5 |
| 282 | + lda varnam |
| 283 | + bpl notfl1 |
| 284 | + dex |
| 285 | +notfl1 |
| 286 | + lda varnam+1 |
| 287 | + bpl 10$ |
| 288 | + dex |
| 289 | + dex |
| 290 | +10$ stx addend |
| 291 | + lda #0 |
| 292 | + jsr umultd ;on rts, a & y = hi. x = lo. |
| 293 | + txa |
| 294 | + adc arypnt |
| 295 | + sta varpnt |
| 296 | + tya |
| 297 | + adc arypnt+1 |
| 298 | + sta varpnt+1 |
| 299 | + tay |
| 300 | + lda varpnt |
| 301 | +dimrts rts |
| 302 | + .page |
| 303 | + |
| 304 | + ;integer arithmetic routines. |
| 305 | + ; |
| 306 | + ;two byte unsigned integer multiply. |
| 307 | + ;this is for multiply dimensioned arrays. |
| 308 | + ; (a,b)=(curtol)*(5&6,x). |
| 309 | +umult |
| 310 | + sty index |
| 311 | + jsr indlow_ram1 |
| 312 | + sta addend ;low, then high. |
| 313 | + dey |
| 314 | + jsr indlow_ram1 ;put (5&6,lowtr) in faster memory. |
| 315 | +umultd |
| 316 | + sta addend+1 |
| 317 | + lda #16 |
| 318 | + sta deccnt |
| 319 | + ldx #0 ;clear the accs. |
| 320 | + ldy #0 ;result initially zero. |
| 321 | +umultc |
| 322 | + txa |
| 323 | + asl a ;multiply by two. |
| 324 | + tax |
| 325 | + tya |
| 326 | + rol a |
| 327 | + tay |
| 328 | + bcs omerr1 ;to much! |
| 329 | + asl curtol |
| 330 | + rol curtol+1 |
| 331 | + bcc umlcnt ;nothing in this position to multiply. |
| 332 | + clc |
| 333 | + txa |
| 334 | + adc addend |
| 335 | + tax |
| 336 | + tya |
| 337 | + adc addend+1 |
| 338 | + tay |
| 339 | + bcs omerr1 ;man, just too much! |
| 340 | +umlcnt |
| 341 | + dec deccnt ;done? |
| 342 | + bne umultc ;keep it up. |
| 343 | + rts ;yes, all done. |
| 344 | + |
| 345 | + |
| 346 | +fmaptr lda count |
| 347 | + asl a |
| 348 | + adc #5 ;point to entries. c cleared by asl. |
| 349 | + adc lowtr |
| 350 | + ldy lowtr+1 |
| 351 | + bcc 1$ |
| 352 | + iny |
| 353 | +1$ sta arypnt |
| 354 | + sty arypnt+1 |
| 355 | + rts |
| 356 | + |
| 357 | +;end |
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