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1.1 ! root 1: #ifndef lint ! 2: static char sccsid[] = "@(#)ti.c 4.2 8/11/83"; ! 3: #endif ! 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: }
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