--- ray/src/cal/tabfunc.c	2020/06/29 21:25:36	1.9
+++ ray/src/cal/tabfunc.c	2024/02/28 03:17:23	1.11
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: tabfunc.c,v 1.9 2020/06/29 21:25:36 greg Exp $";
+static const char	RCSid[] = "$Id: tabfunc.c,v 1.11 2024/02/28 03:17:23 greg Exp $";
 #endif
 /*
  * Put tabular data into functions suitable for cal programs.
@@ -106,7 +106,7 @@ FILE	*fp
 				goto fatal;
 			}
 			ordinate[i][tabsize] = atof(cp);
-			if ((cp = fskip(cp)) == NULL) {
+			if ((cp = fskip(cp)) == NULL || !isdelim(*cp)) {
 				err = "bad floating-point format";
 				goto fatal;
 			}
@@ -156,20 +156,21 @@ absc_exp(void)			/* produce expression for abscissa */
 		printf("X`%s(i):select(i,", locID);
 		putlist(abscissa, tabsize, 20);
 		puts(");");
-		if (increasing) {
+		if (increasing)
 			printf("fx2`%s(x,i):if(x-X`%s(i),\n", locID, locID);
+		else
+			printf("fx2`%s(x,i):if(X`%s(i)-x,\n", locID, locID);
+		printf("\ti+(x-X`%s(i))/(X`%s(i+1)-X`%s(i)),\n",
+				locID, locID, locID);
+		printf("\tfx2`%s(x,i-1));\n", locID);
+		if (increasing)
 			printf("fx`%s(x):if(x-%g,if(%g-x,fx2`%s(x,%d),%d),1);\n",
 					locID, abscissa[0], abscissa[tabsize-1],
 					locID, tabsize, tabsize);
-		} else {
-			printf("fx2`%s(x,i):if(X`%s(i)-x,\n", locID, locID);
+		else
 			printf("fx`%s(x):if(%g-x,if(x-%g,fx2`%s(x,%d),%d),1);\n",
 					locID, abscissa[0], abscissa[tabsize-1],
 					locID, tabsize, tabsize);
-		}
-		printf("\ti+(x-X`%s(i))/(X`%s(i+1)-X`%s(i)),\n",
-				locID, locID, locID);
-		printf("\tfx2`%s(x,i-1));\n", locID);
 		sprintf(ourexp, "fx`%s(x)", locID);
 	}
 	return(ourexp);