COMP: Try to remove more warnings

Utilities/cmtar/compat/snprintf.c

@@ -311,7 +311,7 @@ static void dopr (char *buffer, size_t maxlen, const char *format, va_list args)
     fvalue = va_arg (args, double);
   break;
       case 'c':
-  dopr_outch (buffer, &currlen, maxlen, va_arg (args, int));
+  dopr_outch (buffer, &currlen, maxlen, (char)(va_arg (args, int)));
   break;
       case 's':
   strvalue = va_arg (args, char *);
@@ -478,7 +478,7 @@ static void fmtint (char *buffer, size_t *currlen, size_t maxlen,
 
   /* Sign */
   if (signvalue) 
-    dopr_outch (buffer, currlen, maxlen, signvalue);
+    dopr_outch (buffer, currlen, maxlen, (char)signvalue);
 
   /* Zeros */
   if (zpadlen > 0) 
@@ -629,7 +629,7 @@ static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
   {
     if (signvalue) 
     {
-      dopr_outch (buffer, currlen, maxlen, signvalue);
+      dopr_outch (buffer, currlen, maxlen, (char)signvalue);
       --padlen;
       signvalue = 0;
     }
@@ -645,7 +645,7 @@ static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
     --padlen;
   }
   if (signvalue) 
-    dopr_outch (buffer, currlen, maxlen, signvalue);
+    dopr_outch (buffer, currlen, maxlen, (char)signvalue);
 
   while (iplace > 0) 
     dopr_outch (buffer, currlen, maxlen, iconvert[--iplace]);