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Add range check to Fl_Group::child(int) 

Returns NULL if n is out of range to prevent accessing undefined
memory.
This commit is contained in:
Albrecht Schlosser 2024-10-25 02:39:47 +02:00
parent f9f89be7d7
commit c0e07d3452
1 changed files with 16 additions and 4 deletions
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20
FL/Fl_Group.H
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@ -29,7 +29,7 @@ class Fl_Rect;
/**
The Fl_Group class is the FLTK container widget. It maintains
The Fl_Group class is the main FLTK container widget. It maintains
an array of child widgets. These children can themselves be any widget
including Fl_Group. The most important subclass of Fl_Group
is Fl_Window, however groups can also be used to control radio buttons
@ -95,11 +95,23 @@ public:
/**
Returns how many child widgets the group has.
*/
int children() const {return children_;}
int children() const { return children_; }
/**
Returns array()[n]. <i>No range checking is done!</i>
Returns the n'th child.
Returns \c NULL if \c n is out of range (since FLTK 1.4.0).
<i>No range checking was done in FLTK 1.3 and older versions!</i>
\param[in] n index of child (0 .. children() - 1)
\return pointer to the n'th child or NULL if out of range
*/
Fl_Widget* child(int n) const {return array()[n];}
Fl_Widget *child(int n) const {
if (n < 0 || n > children() - 1) return NULL;
return array()[n];
}
int find(const Fl_Widget*) const;
/**
See int Fl_Group::find(const Fl_Widget *w) const