libexplain  1.4.D001
libexplain/iocontrol/vidioc_querystd.c
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00001 /*
00002  * libexplain - a library of system-call-specific strerror replacements
00003  * Copyright (C) 2011, 2013 Peter Miller
00004  * Written by Peter Miller <pmiller@opensource.org.au>
00005  *
00006  * This program is free software; you can redistribute it and/or modify it
00007  * under the terms of the GNU Lesser General Public License as published by
00008  * the Free Software Foundation; either version 3 of the License, or (at your
00009  * option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful, but WITHOUT
00012  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00013  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
00014  * License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public License
00017  * along with this program. If not, see <http://www.gnu.org/licenses/>.
00018  */
00019 
00020 #include <libexplain/ac/errno.h>
00021 #include <libexplain/ac/linux/videodev2.h>
00022 #include <libexplain/ac/sys/ioctl.h>
00023 
00024 #include <libexplain/buffer/einval.h>
00025 #include <libexplain/buffer/is_the_null_pointer.h>
00026 #include <libexplain/buffer/v4l2_std_id.h>
00027 #include <libexplain/iocontrol/generic.h>
00028 #include <libexplain/iocontrol/vidioc_querystd.h>
00029 
00030 #ifdef VIDIOC_QUERYSTD
00031 
00032 
00033 static void
00034 print_explanation(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
00035     int errnum, int fildes, int request, const void *data)
00036 {
00037     switch (errnum)
00038     {
00039     case EINVAL:
00040         if (!data)
00041         {
00042             explain_buffer_is_the_null_pointer(sb, "data");
00043             return;
00044         }
00045 
00046         explain_buffer_einval_no_vid_std(sb);
00047         return;
00048 
00049     default:
00050         explain_iocontrol_generic_print_explanation
00051         (
00052             p,
00053             sb,
00054             errnum,
00055             fildes,
00056             request,
00057             data
00058         );
00059         break;
00060     }
00061 }
00062 
00063 
00064 static void
00065 print_data_returned(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
00066     int errnum, int fildes, int request, const void *data)
00067 {
00068     (void)p;
00069     (void)errnum;
00070     (void)fildes;
00071     (void)request;
00072     explain_buffer_v4l2_std_id_ptr(sb, data);
00073 }
00074 
00075 
00076 const explain_iocontrol_t explain_iocontrol_vidioc_querystd =
00077 {
00078     "VIDIOC_QUERYSTD", /* name */
00079     VIDIOC_QUERYSTD, /* value */
00080     0, /* disambiguate */
00081     0, /* print_name */
00082     explain_iocontrol_generic_print_data_pointer, /* print_data */
00083     print_explanation,
00084     print_data_returned,
00085     sizeof(v4l2_std_id), /* data_size */
00086     "v4l2_std_id *", /* data_type */
00087     0, /* flags */
00088     __FILE__,
00089     __LINE__,
00090 };
00091 
00092 #else /* ndef VIDIOC_QUERYSTD */
00093 
00094 const explain_iocontrol_t explain_iocontrol_vidioc_querystd =
00095 {
00096     0, /* name */
00097     0, /* value */
00098     0, /* disambiguate */
00099     0, /* print_name */
00100     0, /* print_data */
00101     0, /* print_explanation */
00102     0, /* print_data_returned */
00103     0, /* data_size */
00104     0, /* data_type */
00105     0, /* flags */
00106     __FILE__,
00107     __LINE__,
00108 };
00109 
00110 #endif /* VIDIOC_QUERYSTD */
00111 
00112 /* vim: set ts=8 sw=4 et : */