Use RichString_appendnAscii where possible

`RichString_appendnAscii()` avoids a `strlen(3)` call over
` RichString_appendAscii()`.
Use the former where the length is available from a previous checked
`snprintf(3)` call.

Keep `RichString_appendAscii()` when passing a string literal and
rely on compilers to optimize the `strlen(3)` call away.

1 files changed, 3 insertions, 2 deletions

diff --git a/DiskIOMeter.c b/DiskIOMeter.c
index dd2e3c46..15ad5e54 100644
--- a/DiskIOMeter.c
+++ b/DiskIOMeter.c
@@ -97,10 +97,11 @@ static void DiskIOMeter_display(ATTR_UNUSED const Object* cast, RichString* out)
    }
 
    char buffer[16];
+   int len;
 
    int color = cached_utilisation_diff > 40.0 ? METER_VALUE_NOTICE : METER_VALUE;
-   xSnprintf(buffer, sizeof(buffer), "%.1f%%", cached_utilisation_diff);
-   RichString_writeAscii(out, CRT_colors[color], buffer);
+   len = xSnprintf(buffer, sizeof(buffer), "%.1f%%", cached_utilisation_diff);
+   RichString_appendnAscii(out, CRT_colors[color], buffer, len);
 
    RichString_appendAscii(out, CRT_colors[METER_TEXT], " read: ");
    Meter_humanUnit(buffer, cached_read_diff, sizeof(buffer));