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readline: make ctrl-u to work like linux console

PATCH New [email protected] 1 participant 1 message Oct 15, 2019 Library code

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PATCH 1/1 readline: make ctrl-u to work like linux console

From: DU HUANPENG <[email protected]>

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 <[email protected]>
---
 lib/readline.c | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)
lib/readline.c +29 -2
index d026af1..eba3da4 100644
@@ -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:
Signature · 9 lines
2.7.4




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