Don't use malloc.h header on OpenBSD.

--- lib/wnutil.c.orig	Sat Jan 20 15:50:23 2007
+++ lib/wnutil.c	Thu Nov 20 01:29:11 2014
@@ -14,9 +14,11 @@
 
 #ifdef __unix__
 #ifndef __MACH__
+#ifndef __OpenBSD__
 #include <malloc.h>
 #endif
 #endif
+#endif
 
 #include <assert.h>
 #include <string.h>
@@ -48,7 +50,7 @@ int wninit(void)
     char *env;
 
     if (!done) {
-	if (env = getenv("WNDBVERSION")) {
+	if ((env = getenv("WNDBVERSION")) != NULL) {
 	    wnrelease = strdup(env);	/* set release */
 	    assert(wnrelease);
 	}
@@ -70,7 +72,7 @@ int re_wninit(void)
 
     closefps();
 
-    if (env = getenv("WNDBVERSION")) {
+    if ((env = getenv("WNDBVERSION")) != NULL) {
 	wnrelease = strdup(env);	/* set release */
 	assert(wnrelease);
     }
@@ -149,25 +151,25 @@ static int do_init(void)
 	sprintf(searchdir, DEFAULTPATH);
 #else
     if ((env = getenv("WNSEARCHDIR")) != NULL)
-	strcpy(searchdir, env);
+	snprintf(searchdir, sizeof(searchdir), "%s", env);
     else if ((env = getenv("WNHOME")) != NULL)
-	sprintf(searchdir, "%s%s", env, DICTDIR);
+	snprintf(searchdir, sizeof(searchdir), "%s%s", env, DICTDIR);
     else
 	strcpy(searchdir, DEFAULTPATH);
 #endif
 
     for (i = 1; i < NUMPARTS + 1; i++) {
-	sprintf(tmpbuf, DATAFILE, searchdir, partnames[i]);
+	snprintf(tmpbuf, sizeof(tmpbuf), DATAFILE, searchdir, partnames[i]);
 	if((datafps[i] = fopen(tmpbuf, "r")) == NULL) {
-	    sprintf(msgbuf,
+	    snprintf(msgbuf, sizeof(msgbuf),
 		    "WordNet library error: Can't open datafile(%s)\n",
 		    tmpbuf);
 	    display_message(msgbuf);
 	    openerr = -1;
 	}
-	sprintf(tmpbuf, INDEXFILE, searchdir, partnames[i]);
+	snprintf(tmpbuf, sizeof(tmpbuf), INDEXFILE, searchdir, partnames[i]);
 	if((indexfps[i] = fopen(tmpbuf, "r")) == NULL) {
-	    sprintf(msgbuf,
+	    snprintf(msgbuf, sizeof(msgbuf),
 		    "WordNet library error: Can't open indexfile(%s)\n",
 		    tmpbuf);
 	    display_message(msgbuf);
@@ -178,35 +180,35 @@ static int do_init(void)
     /* This file isn't used by the library and doesn't have to
        be present.  No error is reported if the open fails. */
 
-    sprintf(tmpbuf, SENSEIDXFILE, searchdir);
+    snprintf(tmpbuf, sizeof(tmpbuf), SENSEIDXFILE, searchdir);
     sensefp = fopen(tmpbuf, "r");
 
     /* If this file isn't present, the runtime code will skip printint out
        the number of times each sense was tagged. */
 
-    sprintf(tmpbuf, CNTLISTFILE, searchdir);
+    snprintf(tmpbuf, sizeof(tmpbuf), CNTLISTFILE, searchdir);
     cntlistfp = fopen(tmpbuf, "r");
 
     /* This file doesn't have to be present.  No error is reported if the
        open fails. */
 
-    sprintf(tmpbuf, KEYIDXFILE, searchdir);
+    snprintf(tmpbuf, sizeof(tmpbuf), KEYIDXFILE, searchdir);
     keyindexfp = fopen(tmpbuf, "r");
 
-    sprintf(tmpbuf, REVKEYIDXFILE, searchdir);
+    snprintf(tmpbuf, sizeof(tmpbuf), REVKEYIDXFILE, searchdir);
     revkeyindexfp = fopen(tmpbuf, "r");
 
-    sprintf(tmpbuf, VRBSENTFILE, searchdir);
+    snprintf(tmpbuf, sizeof(tmpbuf), VRBSENTFILE, searchdir);
     if ((vsentfilefp = fopen(tmpbuf, "r")) == NULL) {
-	sprintf(msgbuf,
+	snprintf(msgbuf, sizeof(msgbuf),
 "WordNet library warning: Can't open verb example sentence file(%s)\n",
 		tmpbuf);
 	display_message(msgbuf);
     }
 
-    sprintf(tmpbuf, VRBIDXFILE, searchdir);
+    snprintf(tmpbuf, sizeof(tmpbuf), VRBIDXFILE, searchdir);
     if ((vidxfilefp = fopen(tmpbuf, "r")) == NULL) {
-	sprintf(msgbuf,
+	snprintf(msgbuf, sizeof(msgbuf),
 "WordNet library warning: Can't open verb example sentence index file(%s)\n",
 		tmpbuf);
 	display_message(msgbuf);
