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__ */ |
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