Gracefully handle no unicode in printf

tcshrc.prompt.defs

@@ -99,11 +99,16 @@ set referencechars_raw="${referencechars_raw} 262e"
 set prompt_hcolor=0
 set prompt_hsym=0
 
-set referencechars=()
-foreach ch ($referencechars_raw)
-    set unicode=`printf "\\u${ch}"`
-    set referencechars=( $referencechars `printf "${unicode}"` )
-end
+if( ! $?CSHENV_NO_UNICODE_PRINTF ) then
+	set referencechars=()
+	foreach ch ($referencechars_raw)
+		set unicode=`printf "\\u${ch}"`
+		set referencechars=( $referencechars `printf "${unicode}"` )
+	end
+else
+	# Safe fallback for when there's no unicode printf
+	set referencechars="A B C D X Y Z"
+endif
 
 # Rotation
 alias precmd 'source ${CSHENV_DIR}/tcshrc.prompt.final'

tcshrc.prompt.final

@@ -280,10 +280,15 @@ if( 0 == ${__res} ) then
         #set git_prompt="%{${csi}${branch_indent}C${csi}mBranch: ${csi}3;38;2;255;192;192m${git_branch}${csi}m${csi}${branch_space}C\n%}"
 
 
-        # If the font doesn't support the special branch symbol... 
-        set branch_symbol=`printf "\uE0A0"`
-        # I could always fallback to this one... (keep padded spaces... for alignment)
-        set branch_symbol=`printf '\u2387\ \ '`
+		if( ! $?CSHENV_NO_UNICODE_PRINTF ) then
+			# If the font doesn't support the special branch symbol... 
+			set branch_symbol=`printf "\uE0A0"`
+			# I could always fallback to this one... (keep padded spaces... for alignment)
+			set branch_symbol=`printf '\u2387\ \ '`
+		else
+			# Non unicode fallback 'X'
+			set branch_symbol='X'
+		endif
         git rev-list --count --left-right \@\{upstream\}..HEAD>&/dev/null
         set __res=$?
         #echo "Got: ${git_counts}"