os: add support for %f to pnprintf

This is the lazy man's %f support. Print the decimal part of the number,
then append a decimal point, then print the first two digits of the
fractional part. So %f in sigsafe printing is really %.2f.

No boundary checks in place here.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Keith Packard <keithp@keithp.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/os/log.c b/os/log.c
index 213906420..7b5c9ee1c 100644
--- a/os/log.c
+++ b/os/log.c
@@ -351,7 +351,16 @@ pnprintf(char *string, size_t size, const char *f, va_list args)
             for (i = 0; i < p_len && s_idx < size - 1; i++)
                 string[s_idx++] = number[i];
             break;
-
+        case 'f':
+            {
+                double d = va_arg(args, double);
+                FormatDouble(d, number);
+                p_len = strlen_sigsafe(number);
+
+                for (i = 0; i < p_len && s_idx < size - 1; i++)
+                    string[s_idx++] = number[i];
+            }
+            break;
         default:
             va_arg(args, char*);
             string[s_idx++] = '%';