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/*
* libexplain - a library of system-call-specific strerror replacements
* Copyright (C) 2011 Peter Miller
* Written by Peter Miller <pmiller@opensource.org.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libexplain/ac/errno.h>
#include <libexplain/ac/linux/videodev2.h>
#include <libexplain/ac/stdio.h>
#include <libexplain/ac/string.h>
#include <libexplain/ac/sys/ioctl.h>
#include <libexplain/buffer/einval.h>
#include <libexplain/buffer/is_the_null_pointer.h>
#include <libexplain/buffer/v4l2_ext_controls.h>
#include <libexplain/iocontrol/generic.h>
#include <libexplain/iocontrol/vidioc_g_ext_ctrls.h>
#include <libexplain/is_efault.h>
#ifdef VIDIOC_G_EXT_CTRLS
static void
print_data(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
int errnum, int fildes, int request, const void *data)
{
(void)p;
(void)errnum;
(void)request;
explain_buffer_v4l2_ext_controls(sb, data, 0, fildes);
}
static void
print_explanation(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
int errnum, int fildes, int request, const void *data)
{
switch (errnum)
{
case EINVAL:
if (!data)
{
explain_buffer_is_the_null_pointer(sb, "data");
return;
}
{
const struct v4l2_ext_controls *arg;
struct v4l2_ext_controls ctrls;
unsigned j;
/*
* Note: fuzz testing could lead to improbably large item
* counts, and this next test should catch most of them.
*/
arg = data;
if (explain_is_efault_pointer(arg, sizeof(*arg)))
goto generic;
if (arg->count)
{
size_t nbytes;
nbytes = arg->count * sizeof(arg->controls[0]);
if(explain_is_efault_pointer(arg->controls, nbytes))
goto generic;
}
/*
* The control class may be the problem.
*/
if (arg->count == 0)
goto bad_ctrl_class;
memset(&ctrls, 0, sizeof(ctrls));
ctrls.ctrl_class = arg->ctrl_class;
if
(
ioctl(fildes, VIDIOC_G_EXT_CTRLS, &ctrls) < 0
&&
errno == EINVAL
)
{
bad_ctrl_class:
explain_buffer_einval_vague(sb, "data->ctrl_class");
return;
}
/*
* One of the controls may be the problem.
*/
for (j = 0; j < arg->count; ++j)
{
struct v4l2_ext_control ctrl;
/* not risking changing caller's data */
ctrl = arg->controls[j];
memset(&ctrls, 0, sizeof(ctrls));
ctrls.ctrl_class = arg->ctrl_class;
ctrls.controls = &ctrl;
ctrls.count = 1;
if
(
ioctl(fildes, VIDIOC_G_EXT_CTRLS, &ctrls) < 0
&&
errno == EINVAL
)
{
char name[64];
snprintf(name, sizeof(name), "data->controls[%d].id", j);
explain_buffer_einval_vague(sb, name);
return;
}
}
}
/* No idea. */
generic:
explain_buffer_einval_vague(sb, "data");
break;
default:
explain_iocontrol_generic_print_explanation
(
p,
sb,
errnum,
fildes,
request,
data
);
break;
}
}
static void
print_data_returned(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
int errnum, int fildes, int request, const void *data)
{
(void)p;
(void)errnum;
(void)request;
explain_buffer_v4l2_ext_controls(sb, data, 1, fildes);
}
const explain_iocontrol_t explain_iocontrol_vidioc_g_ext_ctrls =
{
"VIDIOC_G_EXT_CTRLS", /* name */
VIDIOC_G_EXT_CTRLS, /* value */
0, /* disambiguate */
0, /* print_name */
print_data,
print_explanation,
print_data_returned,
sizeof(struct v4l2_ext_controls), /* data_size */
"struct v4l2_ext_controls *", /* data_type */
0, /* flags */
__FILE__,
__LINE__,
};
#else /* ndef VIDIOC_G_EXT_CTRLS */
const explain_iocontrol_t explain_iocontrol_vidioc_g_ext_ctrls =
{
0, /* name */
0, /* value */
0, /* disambiguate */
0, /* print_name */
0, /* print_data */
0, /* print_explanation */
0, /* print_data_returned */
0, /* data_size */
0, /* data_type */
0, /* flags */
__FILE__,
__LINE__,
};
#endif /* VIDIOC_G_EXT_CTRLS */
/* vim: set ts=8 sw=4 et : */
|
