libexplain
1.4.D001
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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/enotsup.h> 00026 #include <libexplain/buffer/is_the_null_pointer.h> 00027 #include <libexplain/buffer/v4l2_queryctrl.h> 00028 #include <libexplain/iocontrol/generic.h> 00029 #include <libexplain/iocontrol/vidioc_queryctrl.h> 00030 00031 #ifdef VIDIOC_QUERYCTRL 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)request; 00041 explain_buffer_v4l2_queryctrl(sb, data, 0, fildes); 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 if (!data) 00053 { 00054 explain_buffer_is_the_null_pointer(sb, "data"); 00055 return; 00056 } 00057 00058 switch (explain_v4l2_queryctrl_check_id(fildes, data)) 00059 { 00060 case explain_v4l2_queryctrl_check_id_no_idea: 00061 default: 00062 goto best_guess; 00063 00064 case explain_v4l2_queryctrl_check_id_notsup: 00065 explain_buffer_enotsup_device(sb, "data->id"); 00066 break; 00067 00068 case explain_v4l2_queryctrl_check_id_nosuch: 00069 best_guess: 00070 explain_buffer_einval_vague(sb, "data->id"); 00071 break; 00072 00073 case explain_v4l2_queryctrl_check_id_ok: 00074 explain_buffer_einval_vague(sb, "data"); 00075 break; 00076 } 00077 break; 00078 00079 default: 00080 explain_iocontrol_generic_print_explanation 00081 ( 00082 p, 00083 sb, 00084 errnum, 00085 fildes, 00086 request, 00087 data 00088 ); 00089 break; 00090 } 00091 } 00092 00093 00094 static void 00095 print_data_returned(const explain_iocontrol_t *p, explain_string_buffer_t *sb, 00096 int errnum, int fildes, int request, const void *data) 00097 { 00098 (void)p; 00099 (void)errnum; 00100 (void)request; 00101 explain_buffer_v4l2_queryctrl(sb, data, 1, fildes); 00102 } 00103 00104 00105 const explain_iocontrol_t explain_iocontrol_vidioc_queryctrl = 00106 { 00107 "VIDIOC_QUERYCTRL", /* name */ 00108 VIDIOC_QUERYCTRL, /* value */ 00109 0, /* disambiguate */ 00110 0, /* print_name */ 00111 print_data, 00112 print_explanation, 00113 print_data_returned, 00114 sizeof(struct v4l2_queryctrl), /* data_size */ 00115 "struct v4l2_queryctrl *", /* data_type */ 00116 0, /* flags */ 00117 __FILE__, 00118 __LINE__, 00119 }; 00120 00121 #else /* ndef VIDIOC_QUERYCTRL */ 00122 00123 const explain_iocontrol_t explain_iocontrol_vidioc_queryctrl = 00124 { 00125 0, /* name */ 00126 0, /* value */ 00127 0, /* disambiguate */ 00128 0, /* print_name */ 00129 0, /* print_data */ 00130 0, /* print_explanation */ 00131 0, /* print_data_returned */ 00132 0, /* data_size */ 00133 0, /* data_type */ 00134 0, /* flags */ 00135 __FILE__, 00136 __LINE__, 00137 }; 00138 00139 #endif /* VIDIOC_QUERYCTRL */ 00140 00141 00142 /* vim: set ts=8 sw=4 et : */