1 gvaluecollector.h |
1 /* GObject - GLib Type, Object, Parameter and Signal Library |
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2 * Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc. |
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3 * |
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4 * This library is free software; you can redistribute it and/or |
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5 * modify it under the terms of the GNU Lesser General Public |
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6 * License as published by the Free Software Foundation; either |
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7 * version 2 of the License, or (at your option) any later version. |
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8 * |
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9 * This library is distributed in the hope that it will be useful, |
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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12 * Lesser General Public License for more details. |
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13 * |
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14 * You should have received a copy of the GNU Lesser General |
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15 * Public License along with this library; if not, write to the |
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16 * Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
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17 * Boston, MA 02111-1307, USA. |
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18 * |
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19 * gvaluecollector.h: GValue varargs stubs |
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20 */ |
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21 #ifndef __G_VALUE_COLLECTOR_H__ |
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22 #define __G_VALUE_COLLECTOR_H__ |
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23 |
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24 #include <glib-object.h> |
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25 |
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26 G_BEGIN_DECLS |
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27 |
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28 /* we may want to add aggregate types here some day, if requested |
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29 * by users. the basic C types are covered already, everything |
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30 * smaller than an int is promoted to an integer and floats are |
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31 * always promoted to doubles for varargs call constructions. |
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32 */ |
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33 enum /*< skip >*/ |
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34 { |
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35 G_VALUE_COLLECT_INT = 'i', |
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36 G_VALUE_COLLECT_LONG = 'l', |
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37 G_VALUE_COLLECT_INT64 = 'q', |
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38 G_VALUE_COLLECT_DOUBLE = 'd', |
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39 G_VALUE_COLLECT_POINTER = 'p' |
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40 }; |
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41 |
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42 |
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43 /* vararg union holding actuall values collected |
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44 */ |
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45 union _GTypeCValue |
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46 { |
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47 gint v_int; |
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48 glong v_long; |
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49 gint64 v_int64; |
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50 gdouble v_double; |
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51 gpointer v_pointer; |
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52 }; |
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53 |
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54 |
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55 /* G_VALUE_COLLECT() collects a variable argument value |
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56 * from a va_list. we have to implement the varargs collection as a |
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57 * macro, because on some systems va_list variables cannot be passed |
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58 * by reference. |
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59 * value is supposed to be initialized according to the value |
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60 * type to be collected. |
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61 * var_args is the va_list variable and may be evaluated multiple times. |
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62 * __error is a gchar** variable that will be modified to hold a g_new() |
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63 * allocated error messages if something fails. |
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64 */ |
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65 #define G_VALUE_COLLECT(value, var_args, flags, __error) \ |
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66 G_STMT_START { \ |
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67 GValue *_value = (value); \ |
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68 guint _flags = (flags); \ |
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69 GType _value_type = G_VALUE_TYPE (_value); \ |
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70 GTypeValueTable *_vtable = g_type_value_table_peek (_value_type); \ |
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71 gchar *_collect_format = _vtable->collect_format; \ |
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72 GTypeCValue _cvalues[G_VALUE_COLLECT_FORMAT_MAX_LENGTH] = { { 0, }, }; \ |
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73 guint _n_values = 0; \ |
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74 \ |
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75 if (_vtable->value_free) \ |
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76 _vtable->value_free (_value); \ |
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77 _value->g_type = _value_type; /* value_meminit() from gvalue.c */ \ |
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78 memset (_value->data, 0, sizeof (_value->data)); \ |
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79 while (*_collect_format) \ |
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80 { \ |
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81 GTypeCValue *_cvalue = _cvalues + _n_values++; \ |
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82 \ |
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83 switch (*_collect_format++) \ |
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84 { \ |
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85 case G_VALUE_COLLECT_INT: \ |
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86 _cvalue->v_int = va_arg ((var_args), gint); \ |
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87 break; \ |
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88 case G_VALUE_COLLECT_LONG: \ |
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89 _cvalue->v_long = va_arg ((var_args), glong); \ |
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90 break; \ |
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91 case G_VALUE_COLLECT_INT64: \ |
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92 _cvalue->v_int64 = va_arg ((var_args), gint64); \ |
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93 break; \ |
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94 case G_VALUE_COLLECT_DOUBLE: \ |
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95 _cvalue->v_double = va_arg ((var_args), gdouble); \ |
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96 break; \ |
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97 case G_VALUE_COLLECT_POINTER: \ |
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98 _cvalue->v_pointer = va_arg ((var_args), gpointer); \ |
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99 break; \ |
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100 default: \ |
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101 g_assert_not_reached (); \ |
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102 } \ |
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103 } \ |
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104 *(__error) = _vtable->collect_value (_value, \ |
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105 _n_values, \ |
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106 _cvalues, \ |
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107 _flags); \ |
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108 } G_STMT_END |
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109 |
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110 |
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111 /* G_VALUE_LCOPY() collects a value's variable argument |
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112 * locations from a va_list. usage is analogous to G_VALUE_COLLECT(). |
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113 */ |
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114 #define G_VALUE_LCOPY(value, var_args, flags, __error) \ |
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115 G_STMT_START { \ |
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116 const GValue *_value = (value); \ |
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117 guint _flags = (flags); \ |
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118 GType _value_type = G_VALUE_TYPE (_value); \ |
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119 GTypeValueTable *_vtable = g_type_value_table_peek (_value_type); \ |
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120 gchar *_lcopy_format = _vtable->lcopy_format; \ |
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121 GTypeCValue _cvalues[G_VALUE_COLLECT_FORMAT_MAX_LENGTH] = { { 0, }, }; \ |
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122 guint _n_values = 0; \ |
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123 \ |
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124 while (*_lcopy_format) \ |
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125 { \ |
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126 GTypeCValue *_cvalue = _cvalues + _n_values++; \ |
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127 \ |
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128 switch (*_lcopy_format++) \ |
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129 { \ |
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130 case G_VALUE_COLLECT_INT: \ |
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131 _cvalue->v_int = va_arg ((var_args), gint); \ |
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132 break; \ |
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133 case G_VALUE_COLLECT_LONG: \ |
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134 _cvalue->v_long = va_arg ((var_args), glong); \ |
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135 break; \ |
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136 case G_VALUE_COLLECT_INT64: \ |
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137 _cvalue->v_int64 = va_arg ((var_args), gint64); \ |
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138 break; \ |
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139 case G_VALUE_COLLECT_DOUBLE: \ |
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140 _cvalue->v_double = va_arg ((var_args), gdouble); \ |
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141 break; \ |
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142 case G_VALUE_COLLECT_POINTER: \ |
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143 _cvalue->v_pointer = va_arg ((var_args), gpointer); \ |
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144 break; \ |
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145 default: \ |
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146 g_assert_not_reached (); \ |
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147 } \ |
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148 } \ |
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149 *(__error) = _vtable->lcopy_value (_value, \ |
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150 _n_values, \ |
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151 _cvalues, \ |
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152 _flags); \ |
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153 } G_STMT_END |
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154 |
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155 |
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156 #define G_VALUE_COLLECT_FORMAT_MAX_LENGTH (8) |
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157 |
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158 G_END_DECLS |
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159 |
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160 #endif /* __G_VALUE_COLLECTOR_H__ */ |