libexplain  1.4.D001
libexplain/iocontrol/vidioc_s_audio.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_audio.h>
00027 #include <libexplain/iocontrol/generic.h>
00028 #include <libexplain/iocontrol/vidioc_s_audio.h>
00029 #include <libexplain/is_efault.h>
00030 
00031 #ifdef VIDIOC_S_AUDIO
00032 
00033 
00034 static void
00035 print_data(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
00036     int errnum, int fildes, int request, const void *data)
00037 {
00038     (void)p;
00039     (void)errnum;
00040     (void)fildes;
00041     (void)request;
00042     explain_buffer_v4l2_audio(sb, data, 1);
00043 }
00044 
00045 
00046 static void
00047 print_explanation(const explain_iocontrol_t *p, explain_string_buffer_t *sb,
00048     int errnum, int fildes, int request, const void *data)
00049 {
00050     switch (errnum)
00051     {
00052     case EINVAL:
00053         if (!data)
00054         {
00055             explain_buffer_is_the_null_pointer(sb, "data");
00056             return;
00057         }
00058 
00059         {
00060             const int       *arg;
00061             int             naudios;
00062 
00063             arg = data;
00064             if (explain_is_efault_pointer(arg, sizeof(*arg)))
00065                 goto generic;
00066 
00067             naudios = explain_v4l2_audio_get_naudios(fildes);
00068             if (naudios == 0)
00069             {
00070                 errnum = ENOTTY;
00071                 goto generic;
00072             }
00073             if (naudios > 0)
00074             {
00075                 if (*arg < 0 || *arg >= naudios)
00076                 {
00077                     explain_buffer_einval_out_of_range
00078                     (
00079                         sb,
00080                         "*data",
00081                         0,
00082                         naudios - 1
00083                     );
00084                     return;
00085                 }
00086             }
00087         }
00088 
00089         generic:
00090         explain_buffer_einval_vague(sb, "data");
00091         break;
00092 
00093     default:
00094         explain_iocontrol_generic_print_explanation
00095         (
00096             p,
00097             sb,
00098             errnum,
00099             fildes,
00100             request,
00101             data
00102         );
00103         break;
00104     }
00105 }
00106 
00107 
00108 const explain_iocontrol_t explain_iocontrol_vidioc_s_audio =
00109 {
00110     "VIDIOC_S_AUDIO", /* name */
00111     VIDIOC_S_AUDIO, /* value */
00112     0, /* disambiguate */
00113     0, /* print_name */
00114     print_data,
00115     print_explanation,
00116     0, /* print_data_returned */
00117     sizeof(struct v4l2_audio), /* data_size */
00118     "struct v4l2_audio *", /* data_type */
00119     0, /* flags */
00120     __FILE__,
00121     __LINE__,
00122 };
00123 
00124 #else /* ndef VIDIOC_S_AUDIO */
00125 
00126 const explain_iocontrol_t explain_iocontrol_vidioc_s_audio =
00127 {
00128     0, /* name */
00129     0, /* value */
00130     0, /* disambiguate */
00131     0, /* print_name */
00132     0, /* print_data */
00133     0, /* print_explanation */
00134     0, /* print_data_returned */
00135     0, /* data_size */
00136     0, /* data_type */
00137     0, /* flags */
00138     __FILE__,
00139     __LINE__,
00140 };
00141 
00142 #endif /* VIDIOC_S_AUDIO */
00143 
00144 /* vim: set ts=8 sw=4 et : */