diff --git a/src/gui_xmdlg.c b/src/gui_xmdlg.c
index 072a53c..1ae755e 100644
--- a/src/gui_xmdlg.c
+++ b/src/gui_xmdlg.c
@@ -168,7 +168,7 @@
     get_part(font, 2, buf2);
     get_part(font, 1, buf3);
 
-    if (strlen(buf3))
+    if (*buf3 != NUL)
 	vim_snprintf(buf, TEMP_BUF_SIZE, "%s (%s)", buf2, buf3);
     else
 	vim_snprintf(buf, TEMP_BUF_SIZE, "%s", buf2);
@@ -225,7 +225,7 @@
     if (inPixels)
     {
 	get_part(font, 7, buf);
-	if (strlen(buf) > 0)
+	if (*buf != NUL)
 	{
 	    size = atoi(buf);
 	    sprintf(buf, "%3d", size);
@@ -234,7 +234,7 @@
     else
     {
 	get_part(font, 8, buf);
-	if (strlen(buf) > 0)
+	if (*buf != NUL)
 	{
 	    size = atoi(buf);
 	    temp = (float)size / 10.0;
@@ -261,7 +261,7 @@
     get_part(font, 13, buf1);
     get_part(font, 14, buf2);
 
-    if (strlen(buf1) > 0 && strlen(buf2))
+    if (*buf1 != NUL && *buf2 != NUL)
 	vim_snprintf(buf, TEMP_BUF_SIZE, "%s-%s", buf1, buf2);
     if (!strcmp(buf, " "))
 	strcpy(buf, "-");
@@ -1229,10 +1229,10 @@
 	    size_part(found, sizebuf, data->in_pixels);
 	    encoding_part(found, encodingbuf);
 
-	    if (strlen(namebuf) > 0
-		    && strlen(stylebuf) > 0
-		    && strlen(sizebuf) > 0
-		    && strlen(encodingbuf) > 0)
+	    if (*namebuf != NUL
+		    && *stylebuf != NUL
+		    && *sizebuf != NUL
+		    && *encodingbuf != NUL)
 	    {
 		data->sel[NAME] = XtNewString(namebuf);
 		data->sel[STYLE] = XtNewString(stylebuf);