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drivers/lcd/st7032.c: Fix another error in seek method: Does not account for negative offsets!

This commit is contained in:
Gregory Nutt 2019-01-14 15:54:39 -06:00
parent 7b95a18c91
commit 508f90605c
1 changed files with 40 additions and 27 deletions
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67
drivers/lcd/st7032.c
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@ -913,40 +913,53 @@ static off_t st7032_seek(FAR struct file *filep, off_t offset, int whence)
switch (whence)
{
case SEEK_CUR:
pos += offset;
if (pos > maxpos)
{
pos = maxpos;
}
case SEEK_CUR:
pos += offset;
if (pos > maxpos)
{
pos = maxpos;
}
else if (pos < 0)
{
pos = 0;
}
filep->f_pos = pos;
break;
filep->f_pos = pos;
break;
case SEEK_SET:
pos = offset;
if (pos > maxpos)
{
pos = maxpos;
}
case SEEK_SET:
pos = offset;
if (pos > maxpos)
{
pos = maxpos;
}
else if (pos < 0)
{
pos = 0;
}
filep->f_pos = pos;
break;
filep->f_pos = pos;
break;
case SEEK_END:
pos = maxpos + offset;
if (pos > maxpos)
{
pos = maxpos;
}
case SEEK_END:
pos = maxpos + offset;
if (pos > maxpos)
{
pos = maxpos;
}
else if (pos < 0)
{
pos = 0;
}
filep->f_pos = pos;
break;
filep->f_pos = pos;
break;
default:
/* Return EINVAL if the whence argument is invalid */
default:
/* Return EINVAL if the whence argument is invalid */
pos = (off_t)-EINVAL;
pos = (off_t)-EINVAL;
break;
}
nxsem_post(&priv->sem_excl);