Index: lib/morph.c
--- lib/morph.c.orig
+++ lib/morph.c
@@ -51,21 +51,21 @@ static struct {
     char *str;
     int strlen;
 } prepositions[NUMPREPS] = {
-    "to", 2,
-    "at", 2,
-    "of", 2,
-    "on", 2,
-    "off", 3,
-    "in", 2,
-    "out", 3,
-    "up", 2,
-    "down", 4,
-    "from", 4,
-    "with", 4,
-    "into", 4,
-    "for", 3,
-    "about", 5,
-    "between", 7,
+    { "to", 2 },
+    { "at", 2 },
+    { "of", 2 },
+    { "on", 2 },
+    { "off", 3 },
+    { "in", 2 },
+    { "out", 3 },
+    { "up", 2 },
+    { "down", 4 },
+    { "from", 4 },
+    { "with", 4 },
+    { "into", 4 },
+    { "for", 3 },
+    { "about", 5 },
+    { "between", 7 }
 };
 
 static FILE *exc_fps[NUMPARTS + 1];
@@ -100,7 +100,7 @@ int re_morphinit(void)
 {
     int i;
 
-    for (i = 1; i <= NUMPARTS; i++) {
+    for (i = 0; i < NUMPARTS; i++) {
 	if (exc_fps[i] != NULL) {
 	    fclose(exc_fps[i]); exc_fps[i] = NULL;
 	}
@@ -144,18 +144,19 @@ static int do_init(void)
     } else
 	sprintf(searchdir, DEFAULTPATH);
 #else
-    if ((env = getenv("WNSEARCHDIR")) != NULL)
-	strcpy(searchdir, env);
-    else if ((env = getenv("WNHOME")) != NULL)
-	sprintf(searchdir, "%s%s", env, DICTDIR);
-    else
+    if ((env = getenv("WNSEARCHDIR")) != NULL) {
+	snprintf(searchdir, sizeof(searchdir), "%s", env);
+    } else if ((env = getenv("WNHOME")) != NULL) {
+	snprintf(searchdir, sizeof(searchdir), "%s%s", env, DICTDIR);
+    } else {
 	strcpy(searchdir, DEFAULTPATH);
+    }
 #endif
 
-    for (i = 1; i <= NUMPARTS; i++) {
-	sprintf(fname, EXCFILE, searchdir, partnames[i]);
+    for (i = 0; i < NUMPARTS; i++) {
+	snprintf(fname, sizeof(fname), EXCFILE, searchdir, partnames[i+1]);
 	if ((exc_fps[i] = fopen(fname, "r")) == NULL) {
-	    sprintf(msgbuf,
+	    snprintf(msgbuf, sizeof(msgbuf),
 		    "WordNet library error: Can't open exception file(%s)\n\n",
 		    fname);
 	    display_message(msgbuf);
@@ -178,13 +179,16 @@ char *morphstr(char *origstr, int pos)
     int prep;
     char *end_idx1, *end_idx2;
     char *append;
-    
+
     if (pos == SATELLITE)
 	pos = ADJ;
 
     /* First time through for this string */
 
     if (origstr != NULL) {
+        if (strlen(origstr) > WORDBUF - 1)
+            return(NULL);
+
 	/* Assume string hasn't had spaces substitued with '_' */
 	strtolower(strsubst(strcpy(str, origstr), ' ', '_'));
 	searchstr[0] = '\0';
@@ -232,7 +236,7 @@ char *morphstr(char *origstr, int pos)
 		if (end_idx < 0) return(NULL);		/* shouldn't do this */
 		strncpy(word, str + st_idx, end_idx - st_idx);
 		word[end_idx - st_idx] = '\0';
-		if(tmp = morphword(word, pos))
+		if ((tmp = morphword(word, pos)) != NULL)
 		    strcat(searchstr,tmp);
 		else
 		    strcat(searchstr,word);
@@ -240,7 +244,7 @@ char *morphstr(char *origstr, int pos)
 		st_idx = end_idx + 1;
 	    }
 	    
-	    if(tmp = morphword(strcpy(word, str + st_idx), pos)) 
+	    if ((tmp = morphword(strcpy(word, str + st_idx), pos)) != NULL)
 		strcat(searchstr,tmp);
 	    else
 		strcat(searchstr,word);
@@ -270,16 +274,15 @@ char *morphword(char *word, int pos)
 {
     int offset, cnt;
     int i;
-    static char retval[WORDBUF];
-    char *tmp, tmpbuf[WORDBUF], *end;
-    
-    sprintf(retval,"");
-    sprintf(tmpbuf, "");
-    end = "";
-    
+    static char retval[WORDBUF] = "";
+    char *tmp, tmpbuf[WORDBUF] = "", *end = "";
+
     if(word == NULL) 
 	return(NULL);
 
+    if (strlen(word) > WORDBUF - 1)
+        return(NULL);
+
     /* first look for word on exception list */
     
     if((tmp = exc_lookup(word, pos)) != NULL)
@@ -335,7 +338,10 @@ static char *wordbase(char *word, int ender)
 {
     char *pt1;
     static char copy[WORDBUF];
-    
+
+    if (strlen(word) > WORDBUF - 1)
+        return(NULL);
+
     strcpy(copy, word);
     if(strend(copy,sufx[ender])) {
 	pt1=strchr(copy,'\0');
@@ -368,13 +374,14 @@ static char *exc_lookup(char *word, int pos)
 {
     static char line[WORDBUF], *beglp, *endlp;
     char *excline;
-    int found = 0;
 
     if (exc_fps[pos] == NULL)
 	return(NULL);
 
     /* first time through load line from exception file */
     if(word != NULL){
+        if (strlen(word) > WORDBUF - 1)
+           return(NULL);
 	if ((excline = bin_search(word, exc_fps[pos])) != NULL) {
 	    strcpy(line, excline);
 	    endlp = strchr(line,' ');
@@ -403,6 +410,9 @@ static char *morphprep(char *s)
     char word[WORDBUF], end[WORDBUF];
     static char retval[WORDBUF];
 
+    if (strlen(s) > WORDBUF - 1)
+        return (NULL);
+
     /* Assume that the verb is the first word in the phrase.  Strip it
        off, check for validity, then try various morphs with the
        rest of the phrase tacked on, trying to find a match. */
@@ -410,7 +420,7 @@ static char *morphprep(char *s)
     rest = strchr(s, '_');
     last = strrchr(s, '_');
     if (rest != last) {		/* more than 2 words */
-	if (lastwd = morphword(last + 1, NOUN)) {
+	if ((lastwd = morphword(last + 1, NOUN)) != NULL) {
 	    strncpy(end, rest, last - rest + 1);
 	    end[last-rest+1] = '\0';
 	    strcat(end, lastwd);