| 1 | # |
| 2 | /* |
| 3 | * |
| 4 | * UNIX debugger |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include "defs.h" |
| 9 | static char sccsid[] = "@(#)expr.c.bad 4.5 %G%"; |
| 10 | |
| 11 | MSG BADSYM; |
| 12 | MSG BADVAR; |
| 13 | MSG BADKET; |
| 14 | MSG BADSYN; |
| 15 | MSG NOCFN; |
| 16 | MSG NOADR; |
| 17 | MSG BADLOC; |
| 18 | |
| 19 | ADDR lastframe; |
| 20 | ADDR savlastf; |
| 21 | ADDR savframe; |
| 22 | ADDR savpc; |
| 23 | ADDR callpc; |
| 24 | |
| 25 | |
| 26 | |
| 27 | CHAR *lp; |
| 28 | INT radix; |
| 29 | STRING errflg; |
| 30 | L_INT localval; |
| 31 | CHAR isymbol[1024]; |
| 32 | |
| 33 | CHAR lastc,peekc; |
| 34 | |
| 35 | L_INT dot; |
| 36 | L_INT ditto; |
| 37 | INT dotinc; |
| 38 | L_INT var[]; |
| 39 | L_INT expv; |
| 40 | |
| 41 | |
| 42 | |
| 43 | |
| 44 | expr(a) |
| 45 | { /* term | term dyadic expr | */ |
| 46 | INT rc; |
| 47 | L_INT lhs; |
| 48 | |
| 49 | rdc(); lp--; rc=term(a); |
| 50 | |
| 51 | WHILE rc |
| 52 | DO lhs = expv; |
| 53 | |
| 54 | switch ((int)readchar()) { |
| 55 | |
| 56 | case '+': |
| 57 | term(a|1); expv += lhs; break; |
| 58 | |
| 59 | case '-': |
| 60 | term(a|1); expv = lhs - expv; break; |
| 61 | |
| 62 | case '#': |
| 63 | term(a|1); expv = round(lhs,expv); break; |
| 64 | |
| 65 | case '*': |
| 66 | term(a|1); expv *= lhs; break; |
| 67 | |
| 68 | case '%': |
| 69 | term(a|1); expv = lhs/expv; break; |
| 70 | |
| 71 | case '&': |
| 72 | term(a|1); expv &= lhs; break; |
| 73 | |
| 74 | case '|': |
| 75 | term(a|1); expv |= lhs; break; |
| 76 | |
| 77 | case ')': |
| 78 | IF (a&2)==0 THEN error(BADKET); FI |
| 79 | |
| 80 | default: |
| 81 | lp--; |
| 82 | \19return rc); |
| 83 | } |
| 84 | OD |
| 85 | return(rc); |
| 86 | } |
| 87 | |
| 88 | term(a) |
| 89 | { /* item | monadic item | (expr) | */ |
| 90 | |
| 91 | switch ((int)readchar()) { |
| 92 | |
| 93 | case '*': |
| 94 | term(a|1); expv=chkget(expv,DSP); return(1); |
| 95 | |
| 96 | case '@': |
| 97 | term(a|1); expv=chkget(expv,ISP); return(1); |
| 98 | |
| 99 | case '-': |
| 100 | term(a|1); expv = -expv; return(1); |
| 101 | |
| 102 | case '~': |
| 103 |