[Minios-devel] [UNIKRAFT PATCH 1/1] lib/vfscore: Add backspace support to the stdio

[Vlad-Andrei BĂDOIU (78692) <vlad_andrei.badoiu@xxxxxxxxxxxxxxx>]

This patch adds basic backspace support to the stdio. This patch does
not handle the cursor differently for the \t. Removing the last
character is done by outputing \b \b to the console.

Signed-off-by: Vlad-Andrei Badoiu <vlad_andrei.badoiu@xxxxxxxxxxxxxxx>
---
 lib/vfscore/stdio.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/lib/vfscore/stdio.c b/lib/vfscore/stdio.c
index 08335367..f23401ff 100644
--- a/lib/vfscore/stdio.c
+++ b/lib/vfscore/stdio.c
@@ -85,9 +85,19 @@ static int __read_fn(void *dst, void *src __unused, size_t 
*cnt)
                *(buf - 1) = *(buf - 1) == '\r' ?
                                        '\n' : *(buf - 1);
 
-               /* Echo the input */
-               ukplat_coutk(buf - bytes_read, bytes_read);
-               bytes_total += bytes_read;
+               if (*(buf - 1) == '\177') {
+                       /* If this is not the first byte */
+                       if (buf - 1 != dst) {
+                               ukplat_coutk("\b \b", 3);
+                               buf -= 1;
+                               bytes_total -= 1;
+                       }
+                       buf -= 1;
+               } else {
+                       /* Echo the input */
+                       ukplat_coutk(buf - bytes_read, bytes_read);
+                       bytes_total += bytes_read;
+               }
 
        } while (bytes_total < count && *(buf - 1) != '\n'
                        && *(buf - 1) != VEOF);
-- 
2.20.1


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