string_8c-source.html

ORACLE编程的好东西,纯C写的OCI封装.很好用,支持数据池.

<a name="l00158"></a>00158 <span class="comment">/* ------------------------------------------------------------------------ *</span>
<a name="l00159"></a>00159 <span class="comment"> * OCI_StringLength</span>
<a name="l00160"></a>00160 <span class="comment"> * ------------------------------------------------------------------------ */</span>
<a name="l00161"></a>00161 
<a name="l00162"></a>00162 <span class="keywordtype">int</span> OCI_StringLength(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">int</span> size_elem)
<a name="l00163"></a>00163 {
<a name="l00164"></a>00164     OCI_CHECK(ptr == NULL, 0);
<a name="l00165"></a>00165     
<a name="l00166"></a>00166     <span class="keywordflow">if</span> (size_elem == <span class="keyword">sizeof</span>(<span class="keywordtype">char</span>))
<a name="l00167"></a>00167     {
<a name="l00168"></a>00168         <span class="keyword">const</span> <span class="keywordtype">char</span> *s = (<span class="keyword">const</span> <span class="keywordtype">char</span> *) ptr;
<a name="l00169"></a>00169         <span class="keyword">const</span> <span class="keywordtype">char</span> *e = (<span class="keyword">const</span> <span class="keywordtype">char</span> *) ptr;
<a name="l00170"></a>00170 
<a name="l00171"></a>00171         <span class="keywordflow">while</span> (*e++) ;
<a name="l00172"></a>00172 
<a name="l00173"></a>00173         <span class="keywordflow">return</span> (<span class="keywordtype">int</span>) (e - s - 1);
<a name="l00174"></a>00174     }
<a name="l00175"></a>00175     <span class="keywordflow">else</span> <span class="keywordflow">if</span> (size_elem == <span class="keyword">sizeof</span>(<span class="keywordtype">short</span>))
<a name="l00176"></a>00176     {
<a name="l00177"></a>00177         <span class="keyword">const</span> <span class="keywordtype">short</span> *s = (<span class="keyword">const</span> <span class="keywordtype">short</span> *) ptr;
<a name="l00178"></a>00178         <span class="keyword">const</span> <span class="keywordtype">short</span> *e = (<span class="keyword">const</span> <span class="keywordtype">short</span> *) ptr;
<a name="l00179"></a>00179 
<a name="l00180"></a>00180         <span class="keywordflow">while</span> (*e++) ;
<a name="l00181"></a>00181 
<a name="l00182"></a>00182         <span class="keywordflow">return</span> (<span class="keywordtype">int</span>) (e - s - 1);
<a name="l00183"></a>00183     }
<a name="l00184"></a>00184     <span class="keywordflow">else</span> <span class="keywordflow">if</span> (size_elem == <span class="keyword">sizeof</span>(<span class="keywordtype">int</span>))
<a name="l00185"></a>00185     {
<a name="l00186"></a>00186         <span class="keyword">const</span> <span class="keywordtype">int</span> *s = (<span class="keyword">const</span> <span class="keywordtype">int</span> *) ptr;
<a name="l00187"></a>00187         <span class="keyword">const</span> <span class="keywordtype">int</span> *e = (<span class="keyword">const</span> <span class="keywordtype">int</span> *) ptr;
<a name="l00188"></a>00188 
<a name="l00189"></a>00189         <span class="keywordflow">while</span> (*e++) ;
<a name="l00190"></a>00190 
<a name="l00191"></a>00191         <span class="keywordflow">return</span> (<span class="keywordtype">int</span>) (e - s - 1);
<a name="l00192"></a>00192     }
<a name="l00193"></a>00193 
<a name="l00194"></a>00194     <span class="keywordflow">return</span> 0;
<a name="l00195"></a>00195 }
<a name="l00196"></a>00196 
<a name="l00197"></a>00197 <span class="comment">/* ------------------------------------------------------------------------ *</span>
<a name="l00198"></a>00198 <span class="comment"> * OCI_GetInputString</span>
<a name="l00199"></a>00199 <span class="comment"> * ------------------------------------------------------------------------ */</span>
<a name="l00200"></a>00200 
<a name="l00201"></a>00201 <span class="keywordtype">void</span> * OCI_GetInputString(<span class="keywordtype">void</span> *src, <span class="keywordtype">int</span> *size, <span class="keywordtype">int</span> size_char_in,
<a name="l00202"></a>00202                           <span class="keywordtype">int</span> size_char_out)
<a name="l00203"></a>00203 {
<a name="l00204"></a>00204     OCI_CHECK(src  == NULL, NULL);
<a name="l00205"></a>00205     OCI_CHECK(size == NULL, NULL);
<a name="l00206"></a>00206 
<a name="l00207"></a>00207     <span class="keywordflow">if</span> (size_char_in == size_char_out) 
<a name="l00208"></a>00208     {
<a name="l00209"></a>00209         <span class="comment">/* in/out type sizes are equal, so no conversion ! */</span>
<a name="l00210"></a>00210        
<a name="l00211"></a>00211         <span class="keywordflow">if</span> (*size == -1)
<a name="l00212"></a>00212             *size = OCI_StringLength(src, size_char_in) * size_char_in;
<a name="l00213"></a>00213 
<a name="l00214"></a>00214         <span class="keywordflow">return</span> src;
<a name="l00215"></a>00215     }
<a name="l00216"></a>00216     <span class="keywordflow">else</span>
<a name="l00217"></a>00217     {
<a name="l00218"></a>00218         <span class="comment">/* in/out type size are not equal, so conversion needed ! */</span>
<a name="l00219"></a>00219      
<a name="l00220"></a>00220         <span class="keywordtype">int</span> char_count = 0;
<a name="l00221"></a>00221         <span class="keywordtype">void</span> *dest     = NULL;
<a name="l00222"></a>00222 
<a name="l00223"></a>00223         <span class="keywordflow">if</span> (*size == -1)
<a name="l00224"></a>00224             char_count = OCI_StringLength(src, size_char_in);
<a name="l00225"></a>00225         <span class="keywordflow">else</span>
<a name="l00226"></a>00226             char_count = *size / size_char_in;
<a name="l00227"></a>00227 
<a name="l00228"></a>00228         *size = 0;
<a name="l00229"></a>00229 
<a name="l00230"></a>00230         dest = malloc((<span class="keywordtype">size_t</span>) ((char_count+1)*<span class="keyword">sizeof</span>(size_char_out)));
<a name="l00231"></a>00231 
<a name="l00232"></a>00232         <span class="keywordflow">if</span> (dest != NULL)
<a name="l00233"></a>00233         {
<a name="l00234"></a>00234             <span class="keywordflow">if</span> ((*(<span class="keywordtype">char</span>*) src) != 0)
<a name="l00235"></a>00235             {
<a name="l00236"></a>00236                 <span class="keywordflow">if</span> (size_char_in &gt; size_char_out)
<a name="l00237"></a>00237                 {
<a name="l00238"></a>00238                     char_count = OCI_StringCopy4to2bytes
<a name="l00239"></a>00239                                  (
<a name="l00240"></a>00240                                     (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>   *)  src, char_count,
<a name="l00241"></a>00241                                     (<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> *) dest, char_count
<a name="l00242"></a>00242                                  );
<a name="l00243"></a>00243                 }
<a name="l00244"></a>00244                 <span class="keywordflow">else</span>
<a name="l00245"></a>00245                 {                
<a name="l00246"></a>00246                     char_count = OCI_StringCopy2to4bytes
<a name="l00247"></a>00247                                  (
<a name="l00248"></a>00248                                     (<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> *) src,  char_count, 
<a name="l00249"></a>00249                                     (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>   *) dest, char_count
<a name="l00250"></a>00250                                  );
<a name="l00251"></a>00251                 }
<a name="l00252"></a>00252            }
<a name="l00253"></a>00253                 
<a name="l00254"></a>00254             *size = char_count * size_char_out;
<a name="l00255"></a>00255 
<a name="l00256"></a>00256             memset( (<span class="keywordtype">void</span>*) (((<span class="keywordtype">char</span>*) dest) + *size), 0, <span class="keyword">sizeof</span>(size_char_out));
<a name="l00257"></a>00257         }
<a name="l00258"></a>00258 
<a name="l00259"></a>00259         <span class="keywordflow">return</span> dest;
<a name="l00260"></a>00260     }
<a name="l00261"></a>00261 }
<a name="l00262"></a>00262 
<a name="l00263"></a>00263 <span class="comment">/* ------------------------------------------------------------------------ *</span>
<a name="l00264"></a>00264 <span class="comment"> * OCI_GetOutputString</span>
<a name="l00265"></a>00265 <span class="comment"> * ------------------------------------------------------------------------ */</span>
<a name="l00266"></a>00266 
<a name="l00267"></a>00267 <span class="keywordtype">void</span> OCI_GetOutputString(<span class="keywordtype">void</span> *src, <span class="keywordtype">void</span> *dest, <span class="keywordtype">int</span> *size, <span class="keywordtype">int</span> size_char_in,
<a name="l00268"></a>00268                          <span class="keywordtype">int</span> size_char_out)
<a name="l00269"></a>00269 {
<a name="l00270"></a>00270     <span class="keywordflow">if</span> ((src == NULL) || (dest == NULL) || (size == NULL))
<a name="l00271"></a>00271         <span class="keywordflow">return</span>;
<a name="l00272"></a>00272 
<a name="l00273"></a>00273     <span class="comment">/* do something only if in/out type sizes are not equal ! */</span>
<a name="l00274"></a>00274 
<a name="l00275"></a>00275     <span class="keywordflow">if</span> (size_char_in != size_char_out) 
<a name="l00276"></a>00276     {        
<a name="l00277"></a>00277         <span class="keywordtype">int</span> char_count = 0;
<a name="l00278"></a>00278      
<a name="l00279"></a>00279         <span class="keywordflow">if</span> (*size == -1)
<a name="l00280"></a>00280             char_count = OCI_StringLength(src, size_char_in);
<a name="l00281"></a>00281         <span class="keywordflow">else</span>
<a name="l00282"></a>00282             char_count = *size / size_char_in;
<a name="l00283"></a>00283            
<a name="l00284"></a>00284         <span class="keywordflow">if</span> (size_char_in &gt; size_char_out)
<a name="l00285"></a>00285         {
<a name="l00286"></a>00286             char_count = OCI_StringCopy4to2bytes
<a name="l00287"></a>00287                          (
<a name="l00288"></a>00288                             (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>   *)  src, char_count,
<a name="l00289"></a>00289                             (<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> *) dest, char_count
<a name="l00290"></a>00290                          );
<a name="l00291"></a>00291 
<a name="l00292"></a>00292         }
<a name="l00293"></a>00293         <span class="keywordflow">else</span>
<a name="l00294"></a>00294         {
<a name="l00295"></a>00295             char_count = OCI_StringCopy2to4bytes
<a name="l00296"></a>00296                          (
<a name="l00297"></a>00297                             (<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> *)  src, char_count,
<a name="l00298"></a>00298                             (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>   *) dest, char_count
<a name="l00299"></a>00299                          );
<a name="l00300"></a>00300         }
<a name="l00301"></a>00301 
<a name="l00302"></a>00302         *size = char_count * size_char_out;
<a name="l00303"></a>00303     }
<a name="l00304"></a>00304 }
<a name="l00305"></a>00305 
<a name="l00306"></a>00306 <span class="comment">/* ------------------------------------------------------------------------ *</span>
<a name="l00307"></a>00307 <span class="comment"> * OCI_ConvertString</span>
<a name="l00308"></a>00308 <span class="comment"> * ------------------------------------------------------------------------ */</span>
<a name="l00309"></a>00309 
<a name="l00310"></a>00310 <span class="keywordtype">void</span> OCI_ConvertString(<span class="keywordtype">void</span> *str, <span class="keywordtype">int</span> char_count, <span class="keywordtype">int</span> size_char_in, 
<a name="l00311"></a>00311                        <span class="keywordtype">int</span> size_char_out)
<a name="l00312"></a>00312 {
<a name="l00313"></a>00313     <span class="keywordflow">if</span> (str == NULL)
<a name="l00314"></a>00314         <span class="keywordflow">return</span>;
<a name="l00315"></a>00315 
<a name="l00316"></a>00316     <span class="keywordflow">if</span> (size_char_out &gt; size_char_in)
<a name="l00317"></a>00317     {
<a name="l00318"></a>00318         <span class="comment">/* expand string */</span>
<a name="l00319"></a>00319          
<a name="l00320"></a>00320         <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>   *wcstr  = (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>   *) str;
<a name="l00321"></a>00321         <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> *ustr   = (<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> *) str;
<a name="l00322"></a>00322  
<a name="l00323"></a>00323         <span class="keywordflow">if</span> (*ustr == 0)
<a name="l00324"></a>00324             <span class="keywordflow">return</span>;
<a name="l00325"></a>00325 
<a name="l00326"></a>00326         <span class="keywordflow">while</span> (char_count--)
<a name="l00327"></a>00327             wcstr[char_count] = (<span class="keywordtype">unsigned</span> int) ustr[char_count];
<a name="l00328"></a>00328 
<a name="l00329"></a>00329     }