libexplain  1.4.D001
libexplain/iocontrol/vidiocgcap.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/videodev.h>
00022 #include <libexplain/ac/sys/ioctl.h>
00023 
00024 #include <libexplain/buffer/is_the_null_pointer.h>
00025 #include <libexplain/buffer/video_capability.h>
00026 #include <libexplain/iocontrol/generic.h>
00027 #include <libexplain/iocontrol/vidiocgcap.h>
00028 
00029 #ifdef VIDIOCGCAP
00030 
00031 
00032 static void
00033 print_explanation(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
00034     int errnum, int fildes, int request, const void *data)
00035 {
00036     switch (errnum)
00037     {
00038     case EINVAL:
00039         if (!data)
00040         {
00041             explain_buffer_is_the_null_pointer(sb, "data");
00042             return;
00043         }
00044 
00045         errnum = ENOTTY;
00046         /* Fall through... */
00047 
00048     default:
00049         explain_iocontrol_generic_print_explanation
00050         (
00051             p,
00052             sb,
00053             errnum,
00054             fildes,
00055             request,
00056             data
00057         );
00058         break;
00059     }
00060 }
00061 
00062 
00063 static void
00064 print_data_returned(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
00065     int errnum, int fildes, int request, const void *data)
00066 {
00067     (void)p;
00068     (void)errnum;
00069     (void)fildes;
00070     (void)request;
00071     explain_buffer_video_capability(sb, data);
00072 }
00073 
00074 
00075 const explain_iocontrol_t explain_iocontrol_vidiocgcap =
00076 {
00077     "VIDIOCGCAP", /* name */
00078     VIDIOCGCAP, /* value */
00079     0, /* disambiguate */
00080     0, /* print_name */
00081     explain_iocontrol_generic_print_data_pointer, /* print_data */
00082     print_explanation,
00083     print_data_returned,
00084     sizeof(struct video_capability), /* data_size */
00085     "struct video_capability *", /* data_type */
00086     0, /* flags */
00087     __FILE__,
00088     __LINE__,
00089 };
00090 
00091 #else /* ndef VIDIOCGCAP */
00092 
00093 const explain_iocontrol_t explain_iocontrol_vidiocgcap =
00094 {
00095     0, /* name */
00096     0, /* value */
00097     0, /* disambiguate */
00098     0, /* print_name */
00099     0, /* print_data */
00100     0, /* print_explanation */
00101     0, /* print_data_returned */
00102     0, /* data_size */
00103     0, /* data_type */
00104     0, /* flags */
00105     __FILE__,
00106     __LINE__,
00107 };
00108 
00109 #endif /* VIDIOCGCAP */
00110 
00111 /* vim: set ts=8 sw=4 et : */