fix receiving empty params

2 files changed, 13 insertions, 5 deletions

diff --git a/src/screen.rs b/src/screen.rs
index 2dba4b5..74e0559 100644
--- a/src/screen.rs
+++ b/src/screen.rs
@@ -1571,7 +1571,7 @@ impl vte::Perform for Screen {
 }
 
 fn canonicalize_params_1(params: &vte::Params, default: u16) -> u16 {
-    let first = params.iter().next().map_or(0, |x| x[0]);
+    let first = params.iter().next().map_or(0, |x| *x.get(0).unwrap_or(&0));
     if first == 0 {
         default
     } else {
@@ -1585,10 +1585,10 @@ fn canonicalize_params_2(
     default2: u16,
 ) -> (u16, u16) {
     let mut iter = params.iter();
-    let first = iter.next().map_or(0, |x| x[0]);
+    let first = iter.next().map_or(0, |x| *x.get(0).unwrap_or(&0));
     let first = if first == 0 { default1 } else { first };
 
-    let second = iter.next().map_or(0, |x| x[0]);
+    let second = iter.next().map_or(0, |x| *x.get(0).unwrap_or(&0));
     let second = if second == 0 { default2 } else { second };
 
     (first, second)
@@ -1599,10 +1599,10 @@ fn canonicalize_params_decstbm(
     size: crate::grid::Size,
 ) -> (u16, u16) {
     let mut iter = params.iter();
-    let top = iter.next().map_or(0, |x| x[0]);
+    let top = iter.next().map_or(0, |x| *x.get(0).unwrap_or(&0));
     let top = if top == 0 { 1 } else { top };
 
-    let bottom = iter.next().map_or(0, |x| x[0]);
+    let bottom = iter.next().map_or(0, |x| *x.get(0).unwrap_or(&0));
     let bottom = if bottom == 0 { size.rows } else { bottom };
 
     (top, bottom)
diff --git a/tests/weird.rs b/tests/weird.rs
index bae2aeb..46ecd20 100644
--- a/tests/weird.rs
+++ b/tests/weird.rs
@@ -4,3 +4,11 @@ mod helpers;
 fn intermediate_control() {
     helpers::fixture("intermediate_control");
 }
+
+#[test]
+fn many_empty_params() {
+    let mut parser = vt100::Parser::default();
+    parser.process(b"\x1b[::::::::::::::::::::::::::::::::@");
+    parser.process(b"\x1b[::::::::::::::::::::::::::::::::H");
+    parser.process(b"\x1b[::::::::::::::::::::::::::::::::r");
+}