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fix sort(1) bug where it incorrectly included the field separator in the comparison if it was >= Runeself

--- a/sys/src/cmd/sort.c

+++ b/sys/src/cmd/sort.c

@@ -941,7 +941,7 @@

 uchar*

 skip(uchar *l, int n1, int n2, int bflag, int endfield)

 {

-	int i, c, tc;

+	int i, c, ln, tc;

 	Rune r;

 	if(endfield && n1 < 0)

@@ -948,6 +948,7 @@

 		return 0;

 	c = *l++;

+	ln = 1;

 	tc = args.tabchar;

 	if(tc) {

 		if(tc < Runeself) {

@@ -962,15 +963,15 @@

 			}

 		} else {

 			l--;

-			l += chartorune(&r, (char*)l);

+			l += ln = chartorune(&r, (char*)l);

 			for(i=n1; i>0; i--) {

 				while(r != tc) {

 					if(r == '\n')

 						return 0;

-					l += chartorune(&r, (char*)l);

+					l += ln = chartorune(&r, (char*)l);

 				}

 				if(!(endfield && i == 1))

-					l += chartorune(&r, (char*)l);

+					l += ln = chartorune(&r, (char*)l);

 			}

 			c = r;

 		}

@@ -987,10 +988,12 @@

 	}

 	if(bflag)

-		while(c == ' ' || c == '\t')

+		while(c == ' ' || c == '\t'){

 			c = *l++;

+			ln = 1;

+		}

-	l--;

+	l -= ln;

 	for(i=n2; i>0; i--) {

 		c = *l;

 		if(c < Runeself) {

-- 

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