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* grub-core/gfxmenu/gui_circular_progress.c (circprog_paint): Avoid

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division by-zero and senseless negative divisions.
	(circprog_set_property): Don't accept negative num_ticks.
This commit is contained in:
Vladimir Serbinenko 2013-11-08 15:43:07 +01:00
parent bcfa6d72e3
commit 6af7d49b92
2 changed files with 19 additions and 11 deletions
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24
grub-core/gfxmenu/gui_circular_progress.c
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@ -37,7 +37,7 @@ struct grub_gui_circular_progress
int start;
int end;
int value;
int num_ticks;
unsigned num_ticks;
int start_angle;
int ticks_disappear;
char *theme_dir;
@ -139,15 +139,16 @@ circprog_paint (void *vself, const grub_video_rect_t *region)
center_width, center_height);
int radius = grub_min (height, width) / 2 - grub_max (tick_height, tick_width) / 2 - 1;
int nticks;
int tick_begin;
int tick_end;
if (self->end == self->start)
unsigned nticks;
unsigned tick_begin;
unsigned tick_end;
if (self->end <= self->start
|| self->value <= self->start)
nticks = 0;
else
nticks = (self->num_ticks
* (self->value - self->start)
/ (self->end - self->start));
nticks = ((unsigned) (self->num_ticks
* (self->value - self->start)))
/ ((unsigned) (self->end - self->start));
/* Do ticks appear or disappear as the value approached the end? */
if (self->ticks_disappear)
{
@ -160,7 +161,7 @@ circprog_paint (void *vself, const grub_video_rect_t *region)
tick_end = nticks;
}
int i;
unsigned i;
for (i = tick_begin; i < tick_end; i++)
{
int x;
@ -168,7 +169,8 @@ circprog_paint (void *vself, const grub_video_rect_t *region)
int angle;
/* Calculate the location of the tick. */
angle = self->start_angle + i * GRUB_TRIG_ANGLE_MAX / self->num_ticks;
angle = self->start_angle
+ i * GRUB_TRIG_ANGLE_MAX / self->num_ticks;
x = width / 2 + (grub_cos (angle) * radius / GRUB_TRIG_FRACTION_SCALE);
y = height / 2 + (grub_sin (angle) * radius / GRUB_TRIG_FRACTION_SCALE);
@ -248,7 +250,7 @@ circprog_set_property (void *vself, const char *name, const char *value)
circular_progress_t self = vself;
if (grub_strcmp (name, "num_ticks") == 0)
{
self->num_ticks = grub_strtol (value, 0, 10);
self->num_ticks = grub_strtoul (value, 0, 10);
}
else if (grub_strcmp (name, "start_angle") == 0)
{