diff --git a/config11/config11.c b/config11/config11.c
index 3b6c0f1..229436c 100644
--- a/config11/config11.c
+++ b/config11/config11.c
@@ -24,6 +24,7 @@
    in this Software without prior written authorization from Robert M Supnik.
 */
 
+#include <ctype.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stddef.h>
@@ -57,12 +58,16 @@ char *namtab[RANK_LNT] = {
 
 int main (int argc, char *argv[])
 {
+(void) argc;
+(void) argv;
+
 for ( ;; ) {
     for (i = 0; i < RANK_LNT; i++) numctl[i] = 0;
     printf ("Enter configuration data\n");
     for ( ;; ) {
 	printf ("Name:\t");
-	if (gets (inp) == NULL) return 0;
+	if (fgets (inp, sizeof (inp), stdin) == NULL) return 0;
+	for (cp = inp; *cp != 0; cp++) if (*cp == '\r' || *cp == '\n') *cp = '\0';
 	if (*inp == 0) break;
 	for (cp = inp; *cp != 0; cp++) *cp = toupper (*cp);
 	for (rank = 0; rank < RANK_LNT; rank++) {
@@ -75,7 +80,7 @@ for ( ;; ) {
 	    printf ("\n");
 	    continue;  }
 	printf ("Number:\t");
-	gets (inp);
+	fgets (inp, sizeof (inp), stdin);
 	errno = 0;
 	num = strtoul (inp, &ocp, 10);
 	if (errno || (inp == ocp)) {
@@ -101,7 +106,7 @@ for ( ;; ) {
 	    for (j = 1; j < numctl[i]; j++) {
 		printf ("\t\t  %d\t%06o\n", j + 1, csr);
 		csr = (csr + modtab[i] + 1) & ~modtab[i];  }
-	    printf (" %\t\tgap\t%06o\n", csr);
+	    printf (" %%\t\tgap\t%06o\n", csr);
 	    }
 	if ((i + 1) < RANK_LNT) csr = (csr + modtab[i+1] + 1) & ~modtab[i+1];
 	}
diff --git a/converters/asc/asc.c b/converters/asc/asc.c
index 44630f0..5532f37 100644
--- a/converters/asc/asc.c
+++ b/converters/asc/asc.c
@@ -71,7 +71,7 @@ else mode = MD_WIN;
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".new");
             else strcat (oname, ".new");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/converters/decsys/decsys.c b/converters/decsys/decsys.c
index ac12d34..5eba4cc 100644
--- a/converters/decsys/decsys.c
+++ b/converters/decsys/decsys.c
@@ -42,7 +42,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".dtp");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".dtp");
         else strcat (oname, ".dtp");
 	ifile = fopen (argv[i], "r");
 	if (ifile == NULL) {
diff --git a/converters/dtos8cvt/dtos8cvt.c b/converters/dtos8cvt/dtos8cvt.c
index 8a0b4c0..0d6b495 100644
--- a/converters/dtos8cvt/dtos8cvt.c
+++ b/converters/dtos8cvt/dtos8cvt.c
@@ -42,7 +42,7 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".dt8");
+        if ((ppos = strrchr (oname, '.'))) strcpy (ppos, ".dt8");
                 else strcat (oname, ".dt8");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
diff --git a/converters/fsio/fsio.c b/converters/fsio/fsio.c
index 57017a4..435888a 100644
--- a/converters/fsio/fsio.c
+++ b/converters/fsio/fsio.c
@@ -638,12 +638,12 @@ static struct mountedFS *findMount(
   uint8_t unitpresent = 0;
   unsigned int i;
   char *endptr, *ptr;
-  char origdev[32];
+  char origdev[33];
 
   if ((ptr = strchr(dev, ':')) != NULL) {
     *ptr++ = '\0';
 
-    strncpy(origdev, dev, sizeof(origdev));
+    strncpy(origdev, dev, sizeof(origdev)-1);
 
     /*
      * Determine validity of the device name and whether a unit number is
diff --git a/converters/hpconvert/hpconvert.c b/converters/hpconvert/hpconvert.c
index 93d8ff5..b42a717 100644
--- a/converters/hpconvert/hpconvert.c
+++ b/converters/hpconvert/hpconvert.c
@@ -173,8 +173,9 @@ int main (int    argc,
     char   sig_fwd [SIGNATURE_SIZE], sig_rev [SIGNATURE_SIZE];
     char   hold, cylinder [CYLINDER_SIZE];
     bool   identified = false, reversed = false, debug = false;
-    int    i, cyl, from_cyl, to_cyl, remap;
+    int    cyl, from_cyl, to_cyl, remap;
     int    platter, cylinder_size, hole_size;
+    unsigned long i;
 
 
 /* Read the disc image filename. */
diff --git a/converters/indent/indent.c b/converters/indent/indent.c
index 03760f1..5cc8217 100644
--- a/converters/indent/indent.c
+++ b/converters/indent/indent.c
@@ -45,8 +45,10 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
-            else strcat (oname, ".new");
+        if ((ppos = strrchr (oname, '.')))
+		strcpy (ppos, ".new");
+        else
+		strcat (oname, ".new");
 	ifile = fopen (argv[i], "ra");
 	if (ifile == NULL) {
 	    printf ("Error opening file: %s\n", argv[i]);
diff --git a/converters/littcvt/littcvt.c b/converters/littcvt/littcvt.c
index 617d1ca..b2b4761 100644
--- a/converters/littcvt/littcvt.c
+++ b/converters/littcvt/littcvt.c
@@ -44,8 +44,10 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
-                else strcat (oname, ".new");
+	if ((ppos = strrchr (oname, '.')))
+		strcpy (ppos, ".new");
+	else
+		strcat (oname, ".new");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
 		printf ("Error opening file: %s\n", argv[i]);
diff --git a/converters/m8376/m8376.c b/converters/m8376/m8376.c
index 48ac147..9af6a2c 100644
--- a/converters/m8376/m8376.c
+++ b/converters/m8376/m8376.c
@@ -38,6 +38,9 @@ char fname[256];
 int c, i, j;
 unsigned int wd[1024];
 
+(void) argc;
+(void) argv;
+
 for (i = 0; i < 8; i++) {
 	sprintf (fname, "C:\\temp\\m8376\\m8376e%03d.bin", fnum[i]);
 	fi[i] = fopen (fname, "rb");
diff --git a/converters/mt2tpc/mt2tpc.c b/converters/mt2tpc/mt2tpc.c
index 8bf4acf..f820c9e 100644
--- a/converters/mt2tpc/mt2tpc.c
+++ b/converters/mt2tpc/mt2tpc.c
@@ -46,8 +46,10 @@ if (argc < 2) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".tpc");
-                else strcat (oname, ".tpc");
+	if ((ppos = strrchr (oname, '.')))
+		strcpy (ppos, ".tpc");
+	else
+		strcat (oname, ".tpc");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
 		printf ("Error opening file: %s\n", argv[i]);
diff --git a/converters/mtcvt23/mtcvtv23.c b/converters/mtcvt23/mtcvtv23.c
index 3b150c5..da927c1 100644
--- a/converters/mtcvt23/mtcvtv23.c
+++ b/converters/mtcvt23/mtcvtv23.c
@@ -43,8 +43,10 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".tap");
-                else strcat (oname, ".tap");
+	if ((ppos = strrchr (oname, '.')))
+		strcpy (ppos, ".tap");
+	else
+		strcat (oname, ".tap");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
 		printf ("Error opening file: %s\n", argv[i]);
diff --git a/converters/mtcvtfix/mtcvtfix.c b/converters/mtcvtfix/mtcvtfix.c
index bc0f922..cae0b29 100644
--- a/converters/mtcvtfix/mtcvtfix.c
+++ b/converters/mtcvtfix/mtcvtfix.c
@@ -45,8 +45,10 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
-            else strcat (oname, ".new");
+	if ((ppos = strrchr (oname, '.')))
+		strcpy (ppos, ".new");
+	else
+		strcat (oname, ".new");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
 	    printf ("Error opening file: %s\n", argv[i]);
diff --git a/converters/mtcvtodd/mtcvtodd.c b/converters/mtcvtodd/mtcvtodd.c
index e00c357..1dfce2c 100644
--- a/converters/mtcvtodd/mtcvtodd.c
+++ b/converters/mtcvtodd/mtcvtodd.c
@@ -43,8 +43,10 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
-                else strcat (oname, ".new");
+	if ((ppos = strrchr (oname, '.')))
+		strcpy (ppos, ".new");
+	else
+		strcat (oname, ".new");
 	ifile = fopen (argv[i], "rb");
 	if (ifile == NULL) {
 		printf ("Error opening file: %s\n", argv[i]);
diff --git a/converters/noff/noff.c b/converters/noff/noff.c
index 1234050..ec2b8c7 100644
--- a/converters/noff/noff.c
+++ b/converters/noff/noff.c
@@ -33,7 +33,7 @@
 int main (int argc, char *argv[])
 {
 int i, c, ffc;
-char *ppos, oline[256], oname[256];
+char *ppos, oname[256];
 FILE *ifile, *ofile;
 
 if ((argc < 2) || (argv[0] == NULL)) {
@@ -42,8 +42,10 @@ if ((argc < 2) || (argv[0] == NULL)) {
 
 for (i = 1; i < argc; i++) {
 	strcpy (oname, argv[i]);
-        if (ppos = strrchr (oname, '.')) strcpy (ppos, ".new");
-            else strcat (oname, ".new");
+	if ((ppos = strrchr (oname, '.')))
+		strcpy (ppos, ".new");
+	else
+		strcat (oname, ".new");
 	ifile = fopen (argv[i], "ra");
 	if (ifile == NULL) {
 	    printf ("Error opening file: %s\n", argv[i]);
diff --git a/converters/sfmtcvt/sfmtcvt.c b/converters/sfmtcvt/sfmtcvt.c
index d558d44..ad68fb5 100644
--- a/converters/sfmtcvt/sfmtcvt.c
+++ b/converters/sfmtcvt/sfmtcvt.c
@@ -97,8 +97,10 @@ for (i = 1, numf = 0; i < argc; i++) {
 			maxaddr[0], k, maxaddr[k]);
 		    return 0;  }  }
 	    strcpy (oname, argv[i]);
-            if (ppos = strrchr (oname, '.')) strcpy (ppos, ".bin");
-            else strcat (oname, ".bin");
+	    if ((ppos = strrchr (oname, '.')))
+		strcpy (ppos, ".bin");
+	    else
+		strcat (oname, ".bin");
 	    ofile = fopen (oname, "wb");
 	    if (ofile == NULL) {
 		printf ("Error opening file: %s\n", oname);