projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 27ea8e45 CC |
1 | Original BTL Ratfor System for 4.2 |
| 2 | /* @(#)r0.c 1.1 (Berkeley) %G% */ | |
| 3 | #include "r.h" | |
| 4 | ||
| 5 | int swlevel = -1; | |
| 6 | int swexit[5]; | |
| 7 | int nextcase[5]; | |
| 8 | ||
| 9 | swcode() { | |
| 10 | transfer = 0; | |
| 11 | putcom("switch"); | |
| 12 | swlevel++; | |
| 13 | if (swlevel >= 5) | |
| 14 | error("Switches nested > 5"); | |
| 15 | swexit[swlevel] = yyval = genlab(1); | |
| 16 | outcode("\tI"); | |
| 17 | outnum(yyval); | |
| 18 | outcode(" = "); | |
| 19 | balpar(); | |
| 20 | outdon(); | |
| 21 | nextcase[swlevel] = 0; | |
| 22 | indent++; | |
| 23 | } | |
| 24 | ||
| 25 | getcase() { | |
| 26 | int t, lpar; | |
| 27 | char token[100]; | |
| 28 | ||
| 29 | if (nextcase[swlevel] != 0) { | |
| 30 | outgoto(swexit[swlevel]); | |
| 31 | outcont(nextcase[swlevel]); | |
| 32 | } | |
| 33 | indent--; | |
| 34 | outcode("\tif(.not.("); | |
| 35 | do { | |
| 36 | outcode("I"); | |
| 37 | outnum(swexit[swlevel]); | |
| 38 | outcode(".eq.("); | |
| 39 | lpar = 0; | |
| 40 | do { | |
| 41 | if ((t=gtok(token)) == ':') | |
| 42 | break; | |
| 43 | if (t == '(') | |
| 44 | lpar++; | |
| 45 | else if (t == ')') | |
| 46 | lpar--; | |
| 47 | else if (t == ',') { | |
| 48 | if (lpar == 0) | |
| 49 | break; | |
| 50 | } | |
| 51 | outcode(token); | |
| 52 | } while (lpar >= 0); | |
| 53 | if (lpar < 0) | |
| 54 | error("Missing left parenthesis in case"); | |
| 55 | if (t == ',') | |
| 56 | outcode(").or."); | |
| 57 | } while (t != ':'); | |
| 58 | if (lpar != 0) | |
| 59 | error("Missing parenthesis in case"); | |
| 60 | outcode(")))"); | |
| 61 | nextcase[swlevel] = genlab(1); | |
| 62 | outgoto(nextcase[swlevel]); | |
| 63 | indent++; | |
| 64 | } | |
| 65 | ||
| 66 | getdefault() { | |
| 67 | char token[20]; | |
| 68 | if (gnbtok(token) != ':') | |
| 69 | error("Missing colon after default"); | |
| 70 | outgoto(swexit[swlevel]); | |
| 71 | outcont(nextcase[swlevel]); | |
| 72 | indent--; | |
| 73 | putcom("default"); | |
| 74 | indent++; | |
| 75 | } | |
| 76 | ||
| 77 | endsw(n, def) { | |
| 78 | if (def == 0) | |
| 79 | outcont(nextcase[swlevel]); | |
| 80 | swlevel--; | |
| 81 | if (swlevel < -1) | |
| 82 | error("Switches unwound too far"); | |
| 83 | indent--; | |
| 84 | outcont(n); | |
| 85 | } |