libexplain  1.4.D001
libexplain/iocontrol/vidiocswin.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/string.h>
00023 #include <libexplain/ac/sys/ioctl.h>
00024 
00025 #include <libexplain/buffer/einval.h>
00026 #include <libexplain/buffer/video_window.h>
00027 #include <libexplain/iocontrol/generic.h>
00028 #include <libexplain/iocontrol/vidiocswin.h>
00029 
00030 #ifdef VIDIOCSWIN
00031 
00032 
00033 static void
00034 print_data(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
00035     int errnum, int fildes, int request, const void *data)
00036 {
00037     (void)p;
00038     (void)errnum;
00039     (void)fildes;
00040     (void)request;
00041     explain_buffer_video_window(sb, data, 1);
00042 }
00043 
00044 
00045 static void
00046 print_explanation(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
00047     int errnum, int fildes, int request, const void *data)
00048 {
00049     switch (errnum)
00050     {
00051     case EINVAL:
00052         {
00053             struct video_window qry;
00054 
00055             memset(&qry, 0, sizeof(qry));
00056             if (ioctl(fildes, VIDIOCGWIN, &qry) < 0 && errno == EINVAL)
00057             {
00058                 explain_iocontrol_generic_print_explanation
00059                 (
00060                     p,
00061                     sb,
00062                     ENOTTY,
00063                     fildes,
00064                     request,
00065                     data
00066                 );
00067                 return;
00068             }
00069 
00070             /* FIXME: cross check with capabilities */
00071         }
00072 
00073         /* No idea */
00074         explain_buffer_einval_vague(sb, "data");
00075         break;
00076 
00077     default:
00078         explain_iocontrol_generic_print_explanation
00079         (
00080             p,
00081             sb,
00082             errnum,
00083             fildes,
00084             request,
00085             data
00086         );
00087         break;
00088     }
00089 }
00090 
00091 
00092 static void
00093 print_data_returned(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
00094     int errnum, int fildes, int request, const void *data)
00095 {
00096     (void)p;
00097     (void)errnum;
00098     (void)fildes;
00099     (void)request;
00100     explain_buffer_video_window(sb, data, 1);
00101 }
00102 
00103 
00104 const explain_iocontrol_t explain_iocontrol_vidiocswin =
00105 {
00106     "VIDIOCSWIN", /* name */
00107     VIDIOCSWIN, /* value */
00108     0, /* disambiguate */
00109     0, /* print_name */
00110     print_data,
00111     print_explanation,
00112     print_data_returned,
00113     sizeof(struct video_window), /* data_size */
00114     "struct video_window *", /* data type */
00115     IOCONTROL_FLAG_RW, /* flags */
00116     __FILE__,
00117     __LINE__,
00118 };
00119 
00120 #else /* ndef VIDIOCSWIN */
00121 
00122 const explain_iocontrol_t explain_iocontrol_vidiocswin =
00123 {
00124     0, /* name */
00125     0, /* value */
00126     0, /* disambiguate */
00127     0, /* print_name */
00128     0, /* print_data */
00129     0, /* print_explanation */
00130     0, /* print_data_returned */
00131     0, /* data_size */
00132     0, /* data_type */
00133     0, /* flags */
00134     __FILE__,
00135     __LINE__,
00136 };
00137 
00138 #endif /* VIDIOCSWIN */
00139 
00140 /* vim: set ts=8 sw=4 et : */