--- preserve.c.bak	Fri Sep 29 07:51:32 2000
+++ preserve.c	Sat Oct 14 17:34:03 2000
@@ -492,7 +492,7 @@
       tmp_buf[strlen(tmp_buf)-1]=0;
 
       if ((fgets(buffer,BUFSIZE,fp)) == NULL) return 10;  /* error exit */
-      if (!isdigit((int)buffer[0])) return 10;  /* error exit */
+      if (!isdigit((unsigned char)buffer[0])) return 10;  /* error exit */
 
       /* load temporary node data */
       sscanf(buffer,"%d %lu %lu %lf %lu %lu",
@@ -523,7 +523,7 @@
       tmp_buf[strlen(buffer)-1]=0;
 
       if ((fgets(buffer,BUFSIZE,fp)) == NULL) return 8;  /* error exit */
-      if (!isdigit((int)buffer[0])) return 8;  /* error exit */
+      if (!isdigit((unsigned char)buffer[0])) return 8;  /* error exit */
 
       /* load temporary node data */
       sscanf(buffer,"%d %lu %lu %lf %lu %lu",
@@ -563,7 +563,7 @@
       tmp_buf[strlen(buffer)-1]=0;
 
       if ((fgets(buffer,BUFSIZE,fp)) == NULL) return 9;  /* error exit */
-      if (!isdigit((int)buffer[0])) return 9;  /* error exit */
+      if (!isdigit((unsigned char)buffer[0])) return 9;  /* error exit */
 
       /* load temporary node data */
       sscanf(buffer,"%d %lu %lu %lf %lu %lu",
@@ -602,7 +602,7 @@
       tmp_buf[strlen(buffer)-1]=0;
 
       if ((fgets(buffer,BUFSIZE,fp)) == NULL) return 11;  /* error exit */
-      if (!isdigit((int)buffer[0])) return 11;  /* error exit */
+      if (!isdigit((unsigned char)buffer[0])) return 11;  /* error exit */
 
       /* load temporary node data */
       sscanf(buffer,"%d %lu",&t_rnode.flag,&t_rnode.count);
@@ -627,7 +627,7 @@
       tmp_buf[strlen(buffer)-1]=0;
 
       if ((fgets(buffer,BUFSIZE,fp)) == NULL) return 12;  /* error exit */
-      if (!isdigit((int)buffer[0])) return 12;  /* error exit */
+      if (!isdigit((unsigned char)buffer[0])) return 12;  /* error exit */
 
       /* load temporary node data */
       sscanf(buffer,"%d %lu",&t_anode.flag,&t_anode.count);
@@ -652,7 +652,7 @@
       tmp_buf[strlen(buffer)-1]=0;
 
       if ((fgets(buffer,BUFSIZE,fp)) == NULL) return 13;  /* error exit */
-      if (!isdigit((int)buffer[0])) return 13;  /* error exit */
+      if (!isdigit((unsigned char)buffer[0])) return 13;  /* error exit */
 
       /* load temporary node data */
       sscanf(buffer,"%lu",&t_snode.count);
@@ -677,7 +677,7 @@
       tmp_buf[strlen(buffer)-1]=0;
 
       if ((fgets(buffer,BUFSIZE,fp)) == NULL) return 14;  /* error exit */
-      if (!isdigit((int)buffer[0])) return 14;  /* error exit */
+      if (!isdigit((unsigned char)buffer[0])) return 14;  /* error exit */
 
       /* load temporary node data */
       sscanf(buffer,"%d %lu %lu %lf %lu %lu",