Use custom ISPRINT macro so we don't depend on the current locale settings.

@@ -22,6 +22,8 @@
 #include <string.h>
 #include <mailutils/mailutils.h>
 
+#define ISPRINT(c) ((c)>=' '&&(c)<127) 
+
 int
 main (int argc, char * argv [])
 {
@@ -86,7 +88,7 @@ main (int argc, char * argv [])
   while (stream_read (flt, &buffer, sizeof (buffer), total, &size) == 0
 	 && size > 0)
     {
-      if (printable && !isprint (buffer))
+      if (printable && !ISPRINT (buffer))
 	{
 	  char outbuf[24];
 	  sprintf (outbuf, "\\%03o", (unsigned int) buffer);

@@ -22,12 +22,14 @@
 
 #include <mailutils/mailutils.h>
 
+#define ISPRINT(c) ((c)=='\t'||(c)==' '||(c)=='\n'||((c)>' '&&(c)<128)) 
+
 void
 print (char *p, int printable)
 {
   for (; *p; p++)
     {
-      if (printable && *p != '\n' && !isprint (*p))
+      if (printable && *p != '\n' && !ISPRINT (*p))
 	printf ("\\%03o", *(unsigned char *) p);
       else
 	putchar (*p);