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Date: Sat, 23 Jun 2007 00:24:10 +0200
From: Michael Hanselmann <qemu@hansmi.ch>
Message-ID: <20070622222410.GA27805@hansmi.ch>
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Subject: [Qemu-devel] [PATCH] Implement ^W in readline.c
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To: qemu-devel@nongnu.org

Hello

The patch below implements ^W (Ctrl+W) in readline.c, allowing it to be
used in the monitor.

Signed-off-by: Michael Hanselmann <qemu@hansmi.ch>

Greets,
Michael

---
Index: readline.c
===================================================================
RCS file: /sources/qemu/qemu/readline.c,v
retrieving revision 1.1
diff -u -b -B -r1.1 readline.c
--- readline.c	1 Aug 2004 21:52:19 -0000	1.1
+++ readline.c	22 Jun 2007 22:17:47 -0000
@@ -156,6 +156,45 @@
     }
 }
 
+static void term_backword(void)
+{
+    int start;
+
+    if (term_cmd_buf_index == 0 || term_cmd_buf_index > term_cmd_buf_size) {
+        return;
+    }
+
+    start = term_cmd_buf_index - 1;
+
+    /* find first word (backwards) */
+    while (start > 0) {
+        if (!isspace(term_cmd_buf[start])) {
+            break;
+        }
+
+        --start;
+    }
+
+    /* find first space (backwards) */
+    while (start > 0) {
+        if (isspace(term_cmd_buf[start])) {
+            ++start;
+            break;
+        }
+
+        --start;
+    }
+
+    /* remove word */
+    if (start < term_cmd_buf_index) {
+        memmove(term_cmd_buf + start,
+                term_cmd_buf + term_cmd_buf_index,
+                term_cmd_buf_size - term_cmd_buf_index);
+        term_cmd_buf_size -= term_cmd_buf_index - start;
+        term_cmd_buf_index = start;
+    }
+}
+
 static void term_bol(void)
 {
     term_cmd_buf_index = 0;
@@ -338,6 +377,10 @@
             /* NOTE: readline_start can be called here */
             term_readline_func(term_readline_opaque, term_cmd_buf);
             break;
+        case 23:
+            /* ^W */
+            term_backword();
+            break;
         case 27:
             term_esc_state = IS_ESC;
             break;