Index: sort.c
===================================================================
RCS file: /cvsroot/src/usr.bin/sort/sort.c,v
retrieving revision 1.63
diff -u -p -r1.63 sort.c
--- sort.c	1 Jun 2016 08:24:03 -0000	1.63
+++ sort.c	17 Dec 2016 21:52:34 -0000
@@ -120,7 +120,7 @@ main(int argc, char *argv[])
 	char mode = 0;
 	char *outfile, *outpath = 0;
 	struct field *fldtab;
-	size_t fldtab_sz, fld_cnt;
+	size_t fldtab_sz, fld_cnt, fld_index;
 	struct filelist filelist;
 	int num_input_files;
 	FILE *outfp = NULL;
@@ -142,6 +142,7 @@ main(int argc, char *argv[])
 	/* fldtab[0] is the global options. */
 	fldtab_sz = 3;
 	fld_cnt = 0;
+	fld_index = 0;
 	fldtab = emalloc(fldtab_sz * sizeof(*fldtab));
 	memset(fldtab, 0, fldtab_sz * sizeof(*fldtab));
 
@@ -156,7 +157,7 @@ main(int argc, char *argv[])
 	while ((ch = getopt(argc, argv, SORT_OPTS)) != -1) {
 		switch (ch) {
 		case 'b':
-			fldtab[0].flags |= BI | BT;
+			fldtab[fld_index].flags |= BI | BT;
 			break;
 		case 'c': case 'C': case 'm':
 			if (mode)
@@ -168,7 +169,7 @@ main(int argc, char *argv[])
 			    debug_flags |= 1 << (optarg[i] & 31);
 			break;
 		case 'd': case 'f': case 'i': case 'n': case 'l':
-			fldtab[0].flags |= optval(ch, 0);
+			fldtab[fld_index].flags |= optval(ch, 0);
 			break;
 		case 'H':
 			/* -H was ; use merge sort for blocks of large files' */
@@ -176,10 +177,9 @@ main(int argc, char *argv[])
 			break;
 		case 'k':
 			fldtab = erealloc(fldtab, (fldtab_sz + 1) * sizeof(*fldtab));
-			memset(&fldtab[fldtab_sz], 0, sizeof(fldtab[0]));
-			fldtab_sz++;
+			memset(&fldtab[fldtab_sz++], 0, sizeof(fldtab[0]));
 
-			setfield(optarg, &fldtab[++fld_cnt], fldtab[0].flags);
+			setfield(optarg, &fldtab[++fld_cnt], fldtab[fld_index++].flags);
 			break;
 		case 'o':
 			outpath = optarg;