fonts.c: render() should abort at "\0"

1 files changed, 1 insertions, 1 deletions

diff --git a/fonts.c b/fonts.c
index b8299a3..352b728 100644
--- a/fonts.c
+++ b/fonts.c
@@ -6,7 +6,7 @@ int render(unsigned char *input, int input_len, unsigned char *output, int max_o
 {
   memset(output, 0, max_output_len);
   int output_i = 0;
-  for (int input_i=0; (input_i < input_len) && (output_i*(SYMBOL_WIDTH+1) < max_output_len); input_i++) {
+  for (int input_i=0; (input_i < input_len) && (output_i*(SYMBOL_WIDTH+1) < max_output_len) && input[input_i]; input_i++) {
     unsigned char c = input[input_i];
     if (c >= 0x7f) {
       if (c <= 0xaf) {