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<a href="arg__list_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#ifndef ARG_LIST__</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#define ARG_LIST__</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> </div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//added matt-g 1/15/17</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> </div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">//because the i386 architecture only passes arguments by stack, we can leverage</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>  <span class="comment">//the fact we have a pointer to the beginning of the function's stack in the form</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  <span class="comment">//of the preceeding required argument for the ellipses.</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  </div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">//this method only works if we know what should be on the stack, the only info</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  <span class="comment">//we have of the stack would be a format string passed into a function like printf</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">//arguments on i386 are pushed right to left in the call, meaning the left-most </span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  <span class="comment">//argument is at the bottom of the functions stack.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  </div><div class="line"><a name="l00019"></a><span class="lineno"><a class="line" href="arg__list_8h.html#abb821de0a9df92f33d827f2008093ddc"> 19</a></span> <span class="preprocessor">#define arg_list unsigned char*</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div><div class="line"><a name="l00025"></a><span class="lineno"><a class="line" href="arg__list_8h.html#a65f99a627ef400f9d875acca35dbac69"> 25</a></span> <span class="preprocessor">#define init_arg_list(argList, argBeforeEllipses) { \</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor"> argList = (unsigned char*)&argBeforeEllipses; \</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor"> } \</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor"></span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> arg_size_on_stack(<span class="keyword">const</span> <span class="keywordtype">char</span> *formatType, <span class="keywordtype">int</span> isLong)</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> {</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">if</span>(!isLong)</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  {</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">switch</span>(*formatType)</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  {</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">case</span> <span class="charliteral">'c'</span>: <span class="keywordflow">return</span> <span class="keyword">sizeof</span>(int); <span class="comment">//minimum size of char on stack</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">case</span> <span class="charliteral">'s'</span>: <span class="keywordflow">return</span> <span class="keyword">sizeof</span>(<span class="keywordtype">char</span>*); <span class="comment">//s is a pointer, pointer size is system size</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">case</span> <span class="charliteral">'d'</span>: <span class="keywordflow">case</span> <span class="charliteral">'i'</span>: <span class="keywordflow">return</span> <span class="keyword">sizeof</span>(int); </div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">case</span> <span class="charliteral">'u'</span>: <span class="keywordflow">case</span> <span class="charliteral">'o'</span>: <span class="keywordflow">case</span> <span class="charliteral">'x'</span>: <span class="keywordflow">case</span> <span class="charliteral">'X'</span>: <span class="keywordflow">return</span> <span class="keyword">sizeof</span>(<span class="keywordtype">unsigned</span> int);</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">case</span> <span class="charliteral">'f'</span>: <span class="keywordflow">case</span> <span class="charliteral">'F'</span>: <span class="keywordflow">case</span> <span class="charliteral">'e'</span>: <span class="keywordflow">case</span> <span class="charliteral">'E'</span>: <span class="keywordflow">case</span> <span class="charliteral">'a'</span>: <span class="keywordflow">case</span><span class="charliteral">'A'</span>: <span class="keywordflow">case</span> <span class="charliteral">'g'</span>: <span class="keywordflow">case</span> <span class="charliteral">'G'</span>:</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">return</span> <span class="keyword">sizeof</span>(double); <span class="comment">//float and double are pushed as double precision, 8 bytes</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">case</span> <span class="charliteral">'p'</span>: <span class="keywordflow">return</span> <span class="keyword">sizeof</span>(<span class="keywordtype">void</span>*);</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">default</span>: <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  }</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  }</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> }</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> arg_size_on_stack_from_size(<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size)</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> {</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">return</span> (size < 4) ? <span class="keyword">sizeof</span>(int) : size;</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> }</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span>* next_arg_in_list(<a class="code" href="arg__list_8h.html#abb821de0a9df92f33d827f2008093ddc">arg_list</a>* list, <span class="keyword">const</span> <span class="keywordtype">char</span> *formatType, <span class="keywordtype">int</span> isLong)</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> {</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  *list+=arg_size_on_stack(formatType, isLong);</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">return</span> (<span class="keywordtype">void</span>*)(*list);</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> }</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="preprocessor">#endif //ARG_LIST__</span></div><div class="ttc" id="arg__list_8h_html_abb821de0a9df92f33d827f2008093ddc"><div class="ttname"><a href="arg__list_8h.html#abb821de0a9df92f33d827f2008093ddc">arg_list</a></div><div class="ttdeci">#define arg_list</div><div class="ttdef"><b>Definition:</b> <a href="arg__list_8h_source.html#l00019">arg_list.h:19</a></div></div>
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