[PATCH] readline: make ctrl-u to work like linux console

[sendpatch]

From: DU HUANPENG <u74...@gmail.com>

currtly, the ctrl-u discards the whole line, in most linux
boxes, ctrl-u just remove character before cursor.
this patch make ctrl-u to do this.

Signed-off-by: DU HUANPENG <u74...@gmail.com>
---
 lib/readline.c | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/lib/readline.c b/lib/readline.c
index d026af1..eba3da4 100644
--- a/lib/readline.c
+++ b/lib/readline.c
@@ -291,8 +291,35 @@ int readline(const char *prompt, char *buf, int len)
                        break;
                case BB_KEY_ERASE_LINE:
                case CTL_CH('u'):
-                       BEGINNING_OF_LINE();
-                       ERASE_TO_EOL();
+                       if(num >= eol_num) {
+                               BEGINNING_OF_LINE();
+                               ERASE_TO_EOL();
+                       } else {
+                               for(i=num; i<eol_num; i++) {
+                                       buf[i-num] = buf[i];
+                               }
+                               buf[i] = '\0';
+
+                               for(i=0; i<num; i++) {
+                                       putchar(CTL_BACKSPACE);
+                               }
+                               for(i=0; i<eol_num; i++) {
+                                       putchar(' ');
+                               }
+                               for(i=0; i<eol_num; i++) {
+                                       putchar(CTL_BACKSPACE);
+                               }
+
+                               eol_num -= num;
+                               num = 0;
+
+                               for(i=0; i<eol_num; i++) {
+                                       putchar(buf[i]);
+                               }
+                               for(i=0; i<eol_num; i++) {
+                                       putchar(CTL_BACKSPACE);
+                               }
+                       }
                        break;
                case DEL:
                case BB_KEY_DEL7:
-- 
2.7.4




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