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132
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1 /**
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2 * The vararg module is intended to facilitate vararg manipulation in D.
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3 * It should be interface compatible with the C module "stdarg," and the
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4 * two modules may share a common implementation if possible (as is done
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5 * here).
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6 *
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7 * Copyright: Public Domain
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8 * License: Public Domain
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9 * Authors: Hauke Duden, Walter Bright
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10 */
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11 module tango.core.Vararg;
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12
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13
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14 version( GNU )
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15 {
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16 public import std.stdarg;
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17 }
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18 else
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19 {
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20 /**
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21 * The base vararg list type.
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22 */
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23 alias void* va_list;
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24
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25
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26 template va_start( T )
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27 {
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28 /**
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29 * This function initializes the supplied argument pointer for subsequent
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30 * use by va_arg and va_end.
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31 *
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32 * Params:
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33 * ap = The argument pointer to initialize.
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34 * paramn = The identifier of the rightmost parameter in the function
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35 * parameter list.
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36 */
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37 void va_start( out va_list ap, inout T parmn )
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38 {
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39 ap = cast(va_list) ( cast(void*) &parmn + ( ( T.sizeof + int.sizeof - 1 ) & ~( int.sizeof - 1 ) ) );
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40 }
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41 }
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42
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43
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44 template va_arg( T )
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45 {
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46 /**
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47 * This function returns the next argument in the sequence referenced by
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48 * the supplied argument pointer. The argument pointer will be adjusted
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49 * to point to the next arggument in the sequence.
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50 *
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51 * Params:
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52 * ap = The argument pointer.
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53 *
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54 * Returns:
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55 * The next argument in the sequence. The result is undefined if ap
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56 * does not point to a valid argument.
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57 */
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58 T va_arg( inout va_list ap )
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59 {
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60 T arg = *cast(T*) ap;
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61 ap = cast(va_list) ( cast(void*) ap + ( ( T.sizeof + int.sizeof - 1 ) & ~( int.sizeof - 1 ) ) );
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62 return arg;
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63 }
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64 }
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65
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66
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67 /**
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68 * This function cleans up any resources allocated by va_start. It is
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69 * currently a no-op and exists mostly for syntax compatibility with
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70 * the variadric argument functions for C.
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71 *
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72 * Params:
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73 * ap = The argument pointer.
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74 */
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75 void va_end( va_list ap )
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76 {
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77
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78 }
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79
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80
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81 /**
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82 * This function copied the argument pointer src to dst.
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83 *
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84 * Params:
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85 * src = The source pointer.
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86 * dst = The destination pointer.
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87 */
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88 void va_copy( out va_list dst, va_list src )
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89 {
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90 dst = src;
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91 }
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92 }
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