projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 476fcd16 SL |
1 | #ifndef lint |
| 2 | static char sccsid[] = "@(#)ti.c 4.2 %G%"; | |
| 3 | #endif | |
| 7e959822 BS |
4 | |
| 5 | /* ti.c: classify line intersections */ | |
| 6 | # include "t..c" | |
| 7 | /* determine local environment for intersections */ | |
| 8 | interv(i,c) | |
| 9 | { | |
| 10 | int ku, kl; | |
| 11 | if (c>=ncol || c == 0) | |
| 12 | { | |
| 13 | if (dboxflg) | |
| 14 | { | |
| 15 | if (i==0) return(BOT); | |
| 16 | if (i>=nlin) return(TOP); | |
| 17 | return(THRU); | |
| 18 | } | |
| 19 | if (c>=ncol) | |
| 20 | return(0); | |
| 21 | } | |
| 22 | ku = i>0 ? lefdata(i-1,c) : 0; | |
| 23 | if (i+1 >= nlin) | |
| 24 | kl=0; | |
| 25 | else | |
| 26 | kl = lefdata(allh(i) ? i+1 : i, c); | |
| 27 | if (ku==2 && kl==2) return(THRU); | |
| 28 | if (ku ==2) return(TOP); | |
| 29 | if (kl==BOT) return(2); | |
| 30 | return(0); | |
| 31 | } | |
| 32 | interh(i,c) | |
| 33 | { | |
| 34 | int kl, kr; | |
| 35 | if (fullbot[i]== '=' || (dboxflg && (i==0 || i>= nlin-1))) | |
| 36 | { | |
| 37 | if (c==ncol) | |
| 38 | return(LEFT); | |
| 39 | if (c==0) | |
| 40 | return(RIGHT); | |
| 41 | return(THRU); | |
| 42 | } | |
| 43 | if (i>=nlin) return(0); | |
| 44 | kl = c>0 ? thish (i,c-1) : 0; | |
| 45 | if (kl<=1 && i>0 && allh(up1(i))) | |
| 46 | kl = c>0 ? thish(up1(i),c-1) : 0; | |
| 47 | kr = thish(i,c); | |
| 48 | if (kr<=1 && i>0 && allh(up1(i))) | |
| 49 | kr = c>0 ? thish(up1(i), c) : 0; | |
| 50 | if (kl== '=' && kr == '=') return(THRU); | |
| 51 | if (kl== '=') return(LEFT); | |
| 52 | if (kr== '=') return(RIGHT); | |
| 53 | return(0); | |
| 54 | } | |
| 55 | up1(i) | |
| 56 | { | |
| 57 | i--; | |
| 58 | while (instead[i] && i>0) i--; | |
| 59 | return(i); | |
| 60 | } |