[Qemu-devel] [4657] Refactor and fix do_sendkey (Jan Kiszka).

[Andrzej Zaborowski]

Revision: 4657
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=4657
Author:   balrog
Date:     2008-06-04 10:05:59 +0000 (Wed, 04 Jun 2008)

Log Message:
-----------
Refactor and fix do_sendkey (Jan Kiszka).

Looking at the sendkey implementation, planning to enhance it with a
hold time argument, I found some potential out-of-bound access and not
very readable code. Here is a fix for the former and a (subjective)
improvement of the latter.

Signed-off-by: Jan Kiszka <address@hidden>

Modified Paths:
--------------
    trunk/monitor.c

Modified: trunk/monitor.c
===================================================================
--- trunk/monitor.c     2008-06-04 04:21:01 UTC (rev 4656)
+++ trunk/monitor.c     2008-06-04 10:05:59 UTC (rev 4657)
@@ -919,33 +919,38 @@
     return -1;
 }
 
-static void do_send_key(const char *string)
+static void do_sendkey(const char *string)
 {
-    char keybuf[16], *q;
     uint8_t keycodes[16];
-    const char *p;
-    int nb_keycodes, keycode, i;
+    int nb_keycodes = 0;
+    char keyname_buf[16];
+    char *separator;
+    int keyname_len, keycode, i;
 
-    nb_keycodes = 0;
-    p = string;
-    while (*p != '\0') {
-        q = keybuf;
-        while (*p != '\0' && *p != '-') {
-            if ((q - keybuf) < sizeof(keybuf) - 1) {
-                *q++ = *p;
+    while (1) {
+        separator = strchr(string, '-');
+        keyname_len = separator ? separator - string : strlen(string);
+        if (keyname_len > 0) {
+            pstrcpy(keyname_buf, sizeof(keyname_buf), string);
+            if (keyname_len > sizeof(keyname_buf) - 1) {
+                term_printf("invalid key: '%s...'\n", keyname_buf);
+                return;
             }
-            p++;
+            if (nb_keycodes == sizeof(keycodes)) {
+                term_printf("too many keys\n");
+                return;
+            }
+            keyname_buf[keyname_len] = 0;
+            keycode = get_keycode(keyname_buf);
+            if (keycode < 0) {
+                term_printf("unknown key: '%s'\n", keyname_buf);
+                return;
+            }
+            keycodes[nb_keycodes++] = keycode;
         }
-        *q = '\0';
-        keycode = get_keycode(keybuf);
-        if (keycode < 0) {
-            term_printf("unknown key: '%s'\n", keybuf);
-            return;
-        }
-        keycodes[nb_keycodes++] = keycode;
-        if (*p == '\0')
+        if (!separator)
             break;
-        p++;
+        string = separator + 1;
     }
     /* key down events */
     for(i = 0; i < nb_keycodes; i++) {
@@ -1347,7 +1352,7 @@
     { "i", "/ii.", do_ioport_read,
       "/fmt addr", "I/O port read" },
 
-    { "sendkey", "s", do_send_key,
+    { "sendkey", "s", do_sendkey,
       "keys", "send keys to the VM (e.g. 'sendkey ctrl-alt-f1')" },
     { "system_reset", "", do_system_reset,
       "", "reset the system" },