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author | Tim Deegan <Tim.Deegan@xensource.com> | 2006-11-09 14:23:24 +0000 |
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committer | Tim Deegan <Tim.Deegan@xensource.com> | 2006-11-09 14:23:24 +0000 |
commit | 6f88f21ddc403dc8441f640f43fc691da9d7e44a (patch) | |
tree | 490ea6d7e5435b26c315ec8175bb7cea2936d00b /tools/pygrub | |
parent | 0d58f56d574711d54ed1764aedc3d7c212991c1b (diff) | |
download | xen-6f88f21ddc403dc8441f640f43fc691da9d7e44a.tar.gz xen-6f88f21ddc403dc8441f640f43fc691da9d7e44a.tar.bz2 xen-6f88f21ddc403dc8441f640f43fc691da9d7e44a.zip |
[PYGRUB] Fix a few bounds violations in pygrub's command-line editor.
Don't step off the end of the line, or delete characters that aren't there.
Signed-off-by: Ryan Harper <ryanh@us.ibm.com>
Signed-off-by: Tim Deegan <Tim.Deegan@xensource.com>
Diffstat (limited to 'tools/pygrub')
-rw-r--r-- | tools/pygrub/src/pygrub | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/tools/pygrub/src/pygrub b/tools/pygrub/src/pygrub index 1f63e6e2f2..64a3662704 100644 --- a/tools/pygrub/src/pygrub +++ b/tools/pygrub/src/pygrub @@ -113,17 +113,21 @@ class GrubLineEditor(curses.textpad.Textbox): elif ch == curses.ascii.SOH: # ^a self.pos = 0 elif ch in (curses.ascii.STX,curses.KEY_LEFT): - self.pos -= 1 + if self.pos > 0: + self.pos -= 1 elif ch in (curses.ascii.BS,curses.KEY_BACKSPACE): if self.pos > 0: self.pos -= 1 - self.line.pop(self.pos) + if self.pos < len(self.line): + self.line.pop(self.pos) elif ch == curses.ascii.EOT: # ^d - self.line.pop(self.pos) + if self.pos < len(self.line): + self.line.pop(self.pos) elif ch == curses.ascii.ENQ: # ^e self.pos = len(self.line) elif ch in (curses.ascii.ACK, curses.KEY_RIGHT): - self.pos +=1 + if self.pos < len(self.line): + self.pos +=1 elif ch == curses.ascii.VT: # ^k self.line = self.line[:self.pos] else: |