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<h1>/home/jklowden/releases/freetds-0.91/src/dblib/buffering.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a><a class="code" href="a00057.html">00001</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="a00057.html">dblib_buffer_row</a> {
<a name="l00003"></a><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293">00003</a> <a class="code" href="a00118.html" title="Hold information for any results.">TDSRESULTINFO</a> *<a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>;
<a name="l00005"></a><a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0">00005</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *<a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a>;
<a name="l00007"></a><a class="code" href="a00057.html#a015599345b266045d8bd3fac731e4675">00007</a> DBINT <a class="code" href="a00057.html#a015599345b266045d8bd3fac731e4675" title="row number">row</a>;
<a name="l00009"></a><a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a">00009</a> TDS_INT *<a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a" title="save old sizes">sizes</a>;
<a name="l00010"></a>00010 } <a class="code" href="a00057.html">DBLIB_BUFFER_ROW</a>;
<a name="l00011"></a>00011
<a name="l00012"></a>00012 <span class="keyword">static</span> <span class="keywordtype">void</span> buffer_struct_print(<span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf);
<a name="l00013"></a>00013 <span class="keyword">static</span> <span class="keywordtype">int</span> buffer_save_row(<a class="code" href="a00098.html">DBPROCESS</a> *dbproc);
<a name="l00014"></a>00014 <span class="keyword">static</span> <a class="code" href="a00057.html">DBLIB_BUFFER_ROW</a>* buffer_row_address(<span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> * buf, <span class="keywordtype">int</span> idx);
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="preprocessor">#if ENABLE_EXTRA_CHECKS</span>
<a name="l00017"></a>00017 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">void</span> buffer_check(<span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf)
<a name="l00018"></a>00018 {
<a name="l00019"></a>00019 <span class="keywordtype">int</span> i;
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="comment">/* no buffering */</span>
<a name="l00022"></a>00022 <span class="keywordflow">if</span> (buf->capacity == 0 || buf->capacity == 1) {
<a name="l00023"></a>00023 assert(buf->head == 0);
<a name="l00024"></a>00024 assert(buf->tail == 0 || buf->tail == 1);
<a name="l00025"></a>00025 assert(buf->capacity == 1 || buf->rows == NULL);
<a name="l00026"></a>00026 <span class="keywordflow">return</span>;
<a name="l00027"></a>00027 }
<a name="l00028"></a>00028
<a name="l00029"></a>00029 assert(buf->capacity > 0);
<a name="l00030"></a>00030 assert(buf->head >= 0);
<a name="l00031"></a>00031 assert(buf->tail >= 0);
<a name="l00032"></a>00032 assert(buf->head < buf->capacity);
<a name="l00033"></a>00033 assert(buf->tail <= buf->capacity);
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="comment">/* check empty */</span>
<a name="l00036"></a>00036 <span class="keywordflow">if</span> (buf->tail == buf->capacity) {
<a name="l00037"></a>00037 assert(buf->head == 0);
<a name="l00038"></a>00038 <span class="keywordflow">for</span> (i = 0; buf->rows && i < buf->capacity; ++i) {
<a name="l00039"></a>00039 assert(buf->rows[i].<a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a> == NULL);
<a name="l00040"></a>00040 assert(buf->rows[i].<a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a> == NULL);
<a name="l00041"></a>00041 assert(buf->rows[i].<a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a" title="save old sizes">sizes</a> == NULL);
<a name="l00042"></a>00042 assert(buf->rows[i].<a class="code" href="a00057.html#a015599345b266045d8bd3fac731e4675" title="row number">row</a> == 0);
<a name="l00043"></a>00043 }
<a name="l00044"></a>00044 <span class="keywordflow">return</span>;
<a name="l00045"></a>00045 }
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="keywordflow">if</span> (buf->rows == NULL)
<a name="l00048"></a>00048 <span class="keywordflow">return</span>;
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="comment">/* check filled part */</span>
<a name="l00051"></a>00051 i = buf->tail;
<a name="l00052"></a>00052 <span class="keywordflow">do</span> {
<a name="l00053"></a>00053 assert(i >= 0 && i < buf->capacity);
<a name="l00054"></a>00054 assert(buf->rows[i].<a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a> != NULL);
<a name="l00055"></a>00055 assert(buf->rows[i].<a class="code" href="a00057.html#a015599345b266045d8bd3fac731e4675" title="row number">row</a> > 0);
<a name="l00056"></a>00056 assert(buf->rows[i].<a class="code" href="a00057.html#a015599345b266045d8bd3fac731e4675" title="row number">row</a> <= buf->received);
<a name="l00057"></a>00057 ++i;
<a name="l00058"></a>00058 <span class="keywordflow">if</span> (i == buf->capacity)
<a name="l00059"></a>00059 i = 0;
<a name="l00060"></a>00060 } <span class="keywordflow">while</span> (i != buf->head);
<a name="l00061"></a>00061
<a name="l00062"></a>00062 <span class="comment">/* check empty part */</span>
<a name="l00063"></a>00063 <span class="keywordflow">if</span> (buf->head != buf->tail) {
<a name="l00064"></a>00064 i = buf->head;
<a name="l00065"></a>00065 <span class="keywordflow">do</span> {
<a name="l00066"></a>00066 assert(i >= 0 && i < buf->capacity);
<a name="l00067"></a>00067 assert(buf->rows[i].<a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a> == NULL);
<a name="l00068"></a>00068 assert(buf->rows[i].<a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a> == NULL);
<a name="l00069"></a>00069 assert(buf->rows[i].<a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a" title="save old sizes">sizes</a> == NULL);
<a name="l00070"></a>00070 assert(buf->rows[i].<a class="code" href="a00057.html#a015599345b266045d8bd3fac731e4675" title="row number">row</a> == 0);
<a name="l00071"></a>00071 ++i;
<a name="l00072"></a>00072 <span class="keywordflow">if</span> (i == buf->capacity)
<a name="l00073"></a>00073 i = 0;
<a name="l00074"></a>00074 } <span class="keywordflow">while</span> (i != buf->tail);
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 }
<a name="l00077"></a>00077 <span class="preprocessor">#define BUFFER_CHECK(buf) buffer_check(buf)</span>
<a name="l00078"></a>00078 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00079"></a>00079 <span class="preprocessor"></span><span class="preprocessor">#define BUFFER_CHECK(buf) do {} while(0)</span>
<a name="l00080"></a>00080 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00081"></a>00081 <span class="preprocessor"></span>
<a name="l00110"></a>00110 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00111"></a>00111 buffer_count(<span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf)
<a name="l00112"></a>00112 {
<a name="l00113"></a>00113 BUFFER_CHECK(buf);
<a name="l00114"></a>00114 <span class="keywordflow">return</span> (buf->head > buf->tail) ?
<a name="l00115"></a>00115 buf->head - buf->tail : <span class="comment">/* |...TddddH....| */</span>
<a name="l00116"></a>00116 buf->capacity - (buf->tail - buf->head); <span class="comment">/* |ddddH....Tddd| */</span>
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118
<a name="l00122"></a>00122 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00123"></a>00123 buffer_is_full(<span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf)
<a name="l00124"></a>00124 {
<a name="l00125"></a>00125 BUFFER_CHECK(buf);
<a name="l00126"></a>00126 <span class="keywordflow">return</span> buf->capacity == buffer_count(buf) && buf->capacity > 1;
<a name="l00127"></a>00127 }
<a name="l00128"></a>00128
<a name="l00129"></a>00129 <span class="preprocessor">#ifndef NDEBUG</span>
<a name="l00130"></a>00130 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00131"></a>00131 buffer_index_valid(<span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf, <span class="keywordtype">int</span> idx)
<a name="l00132"></a>00132 {
<a name="l00133"></a>00133 BUFFER_CHECK(buf);
<a name="l00134"></a>00134 <span class="keywordflow">if</span> (buf->tail <= buf->head)
<a name="l00135"></a>00135 <span class="keywordflow">if</span> (buf->head <= idx && idx <= buf->tail)
<a name="l00136"></a>00136 <span class="keywordflow">return</span> 1;
<a name="l00137"></a>00137
<a name="l00138"></a>00138 <span class="keywordflow">if</span> (0 <= idx && idx <= buf->head)
<a name="l00139"></a>00139 <span class="keywordflow">return</span> 1;
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="keywordflow">if</span> (buf->tail <= idx && idx < buf->capacity)
<a name="l00142"></a>00142 <span class="keywordflow">return</span> 1;
<a name="l00143"></a>00143 <span class="preprocessor">#if 0 </span>
<a name="l00144"></a>00144 <span class="preprocessor"></span> printf(<span class="stringliteral">"buffer_index_valid: idx = %d\n"</span>, idx);
<a name="l00145"></a>00145 buffer_struct_print(buf);
<a name="l00146"></a>00146 <span class="preprocessor">#endif</span>
<a name="l00147"></a>00147 <span class="preprocessor"></span> <span class="keywordflow">return</span> 0;
<a name="l00148"></a>00148 }
<a name="l00149"></a>00149 <span class="preprocessor">#endif</span>
<a name="l00150"></a>00150 <span class="preprocessor"></span>
<a name="l00151"></a>00151 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00152"></a>00152 buffer_free_row(<a class="code" href="a00057.html">DBLIB_BUFFER_ROW</a> *row)
<a name="l00153"></a>00153 {
<a name="l00154"></a>00154 <span class="keywordflow">if</span> (row-><a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a" title="save old sizes">sizes</a>)
<a name="l00155"></a>00155 TDS_ZERO_FREE(row-><a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a" title="save old sizes">sizes</a>);
<a name="l00156"></a>00156 <span class="keywordflow">if</span> (row-><a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a>) {
<a name="l00157"></a>00157 tds_free_row(row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>, row-><a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a>);
<a name="l00158"></a>00158 row-><a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a> = NULL;
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160 tds_free_results(row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>);
<a name="l00161"></a>00161 row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a> = NULL;
<a name="l00162"></a>00162 row-><a class="code" href="a00057.html#a015599345b266045d8bd3fac731e4675" title="row number">row</a> = 0;
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164
<a name="l00165"></a>00165 <span class="comment">/*</span>
<a name="l00166"></a>00166 <span class="comment"> * Buffer is freed at slightly odd points, whenever</span>
<a name="l00167"></a>00167 <span class="comment"> * capacity changes: </span>
<a name="l00168"></a>00168 <span class="comment"> * </span>
<a name="l00169"></a>00169 <span class="comment"> * 1. When setting capacity, to release prior buffer. </span>
<a name="l00170"></a>00170 <span class="comment"> * 2. By dbresults. When called the second time, it has to </span>
<a name="l00171"></a>00171 <span class="comment"> * release prior storage because the new resultset will have</span>
<a name="l00172"></a>00172 <span class="comment"> * a different width. </span>
<a name="l00173"></a>00173 <span class="comment"> * 3. By dbclose(), else open/close/open would leak. </span>
<a name="l00174"></a>00174 <span class="comment"> */</span>
<a name="l00175"></a>00175 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00176"></a>00176 buffer_free(<a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf)
<a name="l00177"></a>00177 {
<a name="l00178"></a>00178 BUFFER_CHECK(buf);
<a name="l00179"></a>00179 <span class="keywordflow">if</span> (buf->rows != NULL) {
<a name="l00180"></a>00180 <span class="keywordtype">int</span> i;
<a name="l00181"></a>00181 <span class="keywordflow">for</span> (i = 0; i < buf->capacity; ++i)
<a name="l00182"></a>00182 buffer_free_row(&buf->rows[i]);
<a name="l00183"></a>00183 TDS_ZERO_FREE(buf->rows);
<a name="l00184"></a>00184 }
<a name="l00185"></a>00185 BUFFER_CHECK(buf);
<a name="l00186"></a>00186 }
<a name="l00187"></a>00187
<a name="l00188"></a>00188 <span class="comment">/*</span>
<a name="l00189"></a>00189 <span class="comment"> * When no rows are currently buffered (and the buffer is allocated)</span>
<a name="l00190"></a>00190 <span class="comment"> * set the indices to their initial positions.</span>
<a name="l00191"></a>00191 <span class="comment"> */</span>
<a name="l00192"></a>00192 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00193"></a>00193 buffer_reset(<a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf)
<a name="l00194"></a>00194 {
<a name="l00195"></a>00195 buf->head = 0;
<a name="l00196"></a>00196 buf->current = buf->tail = buf->capacity;
<a name="l00197"></a>00197 BUFFER_CHECK(buf);
<a name="l00198"></a>00198 }
<a name="l00199"></a>00199
<a name="l00200"></a>00200 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00201"></a>00201 buffer_idx_increment(<span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf, <span class="keywordtype">int</span> idx)
<a name="l00202"></a>00202 {
<a name="l00203"></a>00203 <span class="keywordflow">if</span> (++idx >= buf->capacity) {
<a name="l00204"></a>00204 idx = 0;
<a name="l00205"></a>00205 }
<a name="l00206"></a>00206 <span class="keywordflow">return</span> idx;
<a name="l00207"></a>00207 }
<a name="l00208"></a>00208
<a name="l00213"></a>00213 <span class="keyword">static</span> <a class="code" href="a00057.html">DBLIB_BUFFER_ROW</a>*
<a name="l00214"></a>00214 buffer_row_address(<span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> * buf, <span class="keywordtype">int</span> idx)
<a name="l00215"></a>00215 {
<a name="l00216"></a>00216 BUFFER_CHECK(buf);
<a name="l00217"></a>00217 <span class="keywordflow">if</span> (idx < 0 || idx >= buf->capacity) {
<a name="l00218"></a>00218 printf(<span class="stringliteral">"idx is %d:\n"</span>, idx);
<a name="l00219"></a>00219 buffer_struct_print(buf);
<a name="l00220"></a>00220 <span class="keywordflow">return</span> NULL;
<a name="l00221"></a>00221 }
<a name="l00222"></a>00222
<a name="l00223"></a>00223 <span class="keywordflow">return</span> &(buf->rows[idx]);
<a name="l00224"></a>00224 }
<a name="l00225"></a>00225
<a name="l00229"></a>00229 <span class="keyword">static</span> DBINT
<a name="l00230"></a>00230 buffer_idx2row(<span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf, <span class="keywordtype">int</span> idx)
<a name="l00231"></a>00231 {
<a name="l00232"></a>00232 BUFFER_CHECK(buf);
<a name="l00233"></a>00233 <span class="keywordflow">return</span> buffer_row_address(buf, idx)-><a class="code" href="a00057.html#a015599345b266045d8bd3fac731e4675" title="row number">row</a>;
<a name="l00234"></a>00234 }
<a name="l00235"></a>00235
<a name="l00239"></a>00239 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00240"></a>00240 buffer_row2idx(<span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf, <span class="keywordtype">int</span> row_number)
<a name="l00241"></a>00241 {
<a name="l00242"></a>00242 <span class="keywordtype">int</span> i, ii, idx = -1;
<a name="l00243"></a>00243
<a name="l00244"></a>00244 BUFFER_CHECK(buf);
<a name="l00245"></a>00245 <span class="keywordflow">if</span> (buf->tail == buf->capacity) {
<a name="l00246"></a>00246 assert (buf->head == 0);
<a name="l00247"></a>00247 <span class="keywordflow">return</span> -1; <span class="comment">/* no rows buffered */</span>
<a name="l00248"></a>00248 }
<a name="l00249"></a>00249
<a name="l00250"></a>00250 <span class="comment">/* </span>
<a name="l00251"></a>00251 <span class="comment"> * March through the buffers from tail to head, stop if we find our row. </span>
<a name="l00252"></a>00252 <span class="comment"> * A full queue is indicated by tail == head (which means we can't write).</span>
<a name="l00253"></a>00253 <span class="comment"> */</span>
<a name="l00254"></a>00254 <span class="keywordflow">for</span> (ii=0, i = buf->tail; i != buf->head || ii == 0; i = buffer_idx_increment(buf, i)) {
<a name="l00255"></a>00255 <span class="keywordflow">if</span>( buffer_idx2row(buf, i) == row_number) {
<a name="l00256"></a>00256 idx = i;
<a name="l00257"></a>00257 <span class="keywordflow">break</span>;
<a name="l00258"></a>00258 }
<a name="l00259"></a>00259 assert(ii++ < buf->capacity); <span class="comment">/* prevent infinite loop */</span>
<a name="l00260"></a>00260 }
<a name="l00261"></a>00261
<a name="l00262"></a>00262 <span class="keywordflow">return</span> idx;
<a name="l00263"></a>00263 }
<a name="l00264"></a>00264
<a name="l00269"></a>00269 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00270"></a>00270 buffer_delete_rows(<a class="code" href="a00084.html">DBPROC_ROWBUF</a> * buf, <span class="keywordtype">int</span> count)
<a name="l00271"></a>00271 {
<a name="l00272"></a>00272 <span class="keywordtype">int</span> i;
<a name="l00273"></a>00273
<a name="l00274"></a>00274 BUFFER_CHECK(buf);
<a name="l00275"></a>00275 <span class="keywordflow">if</span> (count < 0 || count > buffer_count(buf)) {
<a name="l00276"></a>00276 count = buffer_count(buf);
<a name="l00277"></a>00277 }
<a name="l00278"></a>00278
<a name="l00279"></a>00279 <span class="keywordflow">for</span> (i=0; i < count; i++) {
<a name="l00280"></a>00280 <span class="keywordflow">if</span> (buf->tail < buf->capacity)
<a name="l00281"></a>00281 buffer_free_row(&buf->rows[buf->tail]);
<a name="l00282"></a>00282 buf->tail = buffer_idx_increment(buf, buf->tail);
<a name="l00283"></a>00283 <span class="comment">/* </span>
<a name="l00284"></a>00284 <span class="comment"> * If deleting rows from the buffer catches the tail to the head, </span>
<a name="l00285"></a>00285 <span class="comment"> * return to the initial position. Otherwise, it will look full.</span>
<a name="l00286"></a>00286 <span class="comment"> */</span>
<a name="l00287"></a>00287 <span class="keywordflow">if</span> (buf->tail == buf->head) {
<a name="l00288"></a>00288 buffer_reset(buf);
<a name="l00289"></a>00289 <span class="keywordflow">break</span>;
<a name="l00290"></a>00290 }
<a name="l00291"></a>00291 }
<a name="l00292"></a>00292 <span class="preprocessor">#if 0</span>
<a name="l00293"></a>00293 <span class="preprocessor"></span> buffer_struct_print(buf);
<a name="l00294"></a>00294 <span class="preprocessor">#endif</span>
<a name="l00295"></a>00295 <span class="preprocessor"></span> BUFFER_CHECK(buf);
<a name="l00296"></a>00296 }
<a name="l00297"></a>00297
<a name="l00298"></a>00298 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00299"></a>00299 buffer_transfer_bound_data(<a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf, TDS_INT res_type, TDS_INT compute_id, <a class="code" href="a00098.html">DBPROCESS</a> * dbproc, <span class="keywordtype">int</span> idx)
<a name="l00300"></a>00300 {
<a name="l00301"></a>00301 <span class="keywordtype">int</span> i;
<a name="l00302"></a>00302 <span class="keywordtype">int</span> srctype, desttype;
<a name="l00303"></a>00303 BYTE *src;
<a name="l00304"></a>00304 <span class="keyword">const</span> <a class="code" href="a00057.html">DBLIB_BUFFER_ROW</a> *row;
<a name="l00305"></a>00305
<a name="l00306"></a>00306 tdsdump_log(TDS_DBG_FUNC, <span class="stringliteral">"buffer_transfer_bound_data(%p %d %d %p %d)\n"</span>, buf, res_type, compute_id, dbproc, idx);
<a name="l00307"></a>00307 BUFFER_CHECK(buf);
<a name="l00308"></a>00308 assert(buffer_index_valid(buf, idx));
<a name="l00309"></a>00309
<a name="l00310"></a>00310 row = buffer_row_address(buf, idx);
<a name="l00311"></a>00311 assert(row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>);
<a name="l00312"></a>00312
<a name="l00313"></a>00313 <span class="keywordflow">for</span> (i = 0; i < row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>->num_cols; i++) {
<a name="l00314"></a>00314 DBINT srclen;
<a name="l00315"></a>00315 <a class="code" href="a00092.html" title="Metadata about columns in regular and compute rows.">TDSCOLUMN</a> *curcol = row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>->columns[i];
<a name="l00316"></a>00316
<a name="l00317"></a>00317 <span class="keywordflow">if</span> (row-><a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a" title="save old sizes">sizes</a>)
<a name="l00318"></a>00318 curcol-><a class="code" href="a00092.html#ada14ba479a67762fc1bef78910ef4beb" title="size written in variable (ie: char, text, binary).">column_cur_size</a> = row-><a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a" title="save old sizes">sizes</a>[i];
<a name="l00319"></a>00319
<a name="l00320"></a>00320 <span class="keywordflow">if</span> (curcol->column_nullbind) {
<a name="l00321"></a>00321 <span class="keywordflow">if</span> (curcol-><a class="code" href="a00092.html#ada14ba479a67762fc1bef78910ef4beb" title="size written in variable (ie: char, text, binary).">column_cur_size</a> < 0) {
<a name="l00322"></a>00322 *(DBINT *)(curcol->column_nullbind) = -1;
<a name="l00323"></a>00323 } <span class="keywordflow">else</span> {
<a name="l00324"></a>00324 *(DBINT *)(curcol->column_nullbind) = 0;
<a name="l00325"></a>00325 }
<a name="l00326"></a>00326 }
<a name="l00327"></a>00327 <span class="keywordflow">if</span> (!curcol->column_varaddr)
<a name="l00328"></a>00328 <span class="keywordflow">continue</span>;
<a name="l00329"></a>00329
<a name="l00330"></a>00330 <span class="keywordflow">if</span> (row-><a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a>)
<a name="l00331"></a>00331 src = &row-><a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a>[curcol->column_data - row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>->current_row];
<a name="l00332"></a>00332 <span class="keywordflow">else</span>
<a name="l00333"></a>00333 src = curcol->column_data;
<a name="l00334"></a>00334 srclen = curcol-><a class="code" href="a00092.html#ada14ba479a67762fc1bef78910ef4beb" title="size written in variable (ie: char, text, binary).">column_cur_size</a>;
<a name="l00335"></a>00335 <span class="keywordflow">if</span> (is_blob_col(curcol))
<a name="l00336"></a>00336 src = (BYTE *) ((<a class="code" href="a00091.html" title="Information about blobs (e.g.">TDSBLOB</a> *) src)->textvalue;
<a name="l00337"></a>00337 desttype = _db_get_server_type(curcol->column_bindtype);
<a name="l00338"></a>00338 srctype = tds_get_conversion_type(curcol-><a class="code" href="a00092.html#af6d0def414a911f259e907860736b506" title="This type can be different from wire type because conversion (e.g.">column_type</a>, curcol-><a class="code" href="a00092.html#a2c2756c00a1099c82d4cfa4da2894672" title="maximun size of data.">column_size</a>);
<a name="l00339"></a>00339
<a name="l00340"></a>00340 <span class="keywordflow">if</span> (srclen <= 0) {
<a name="l00341"></a>00341 <span class="keywordflow">if</span> (srclen == 0 || !curcol->column_nullbind)
<a name="l00342"></a>00342 <a class="code" href="a00192.html#abf1b326d4b2838b34a5d006876bd08ef">dbgetnull</a>(dbproc, curcol->column_bindtype, curcol->column_bindlen,
<a name="l00343"></a>00343 (BYTE *) curcol->column_varaddr);
<a name="l00344"></a>00344 } <span class="keywordflow">else</span> {
<a name="l00345"></a>00345 copy_data_to_host_var(dbproc, srctype, src, srclen, desttype,
<a name="l00346"></a>00346 (BYTE *) curcol->column_varaddr, curcol->column_bindlen,
<a name="l00347"></a>00347 curcol->column_bindtype, (DBINT*) curcol->column_nullbind);
<a name="l00348"></a>00348 }
<a name="l00349"></a>00349 }
<a name="l00350"></a>00350
<a name="l00351"></a>00351 <span class="comment">/*</span>
<a name="l00352"></a>00352 <span class="comment"> * This function always bumps current. Usually, it's called </span>
<a name="l00353"></a>00353 <span class="comment"> * by dbnextrow(), so bumping current is a pretty obvious choice. </span>
<a name="l00354"></a>00354 <span class="comment"> * It can also be called by dbgetrow(), but that function also </span>
<a name="l00355"></a>00355 <span class="comment"> * causes the bump. If you call dbgetrow() for row N, a subsequent</span>
<a name="l00356"></a>00356 <span class="comment"> * call to dbnextrow() yields N+1. </span>
<a name="l00357"></a>00357 <span class="comment"> */</span>
<a name="l00358"></a>00358 buf->current = buffer_idx_increment(buf, buf->current);
<a name="l00359"></a>00359
<a name="l00360"></a>00360 } <span class="comment">/* end buffer_transfer_bound_data() */</span>
<a name="l00361"></a>00361
<a name="l00362"></a>00362 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00363"></a>00363 buffer_struct_print(<span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf)
<a name="l00364"></a>00364 {
<a name="l00365"></a>00365 assert(buf);
<a name="l00366"></a>00366
<a name="l00367"></a>00367 printf(<span class="stringliteral">"\t%d rows in buffer\n"</span>, buffer_count(buf));
<a name="l00368"></a>00368
<a name="l00369"></a>00369 printf(<span class="stringliteral">"\thead = %d\t"</span>, buf->head);
<a name="l00370"></a>00370 printf(<span class="stringliteral">"\ttail = %d\t"</span>, buf->tail);
<a name="l00371"></a>00371 printf(<span class="stringliteral">"\tcurrent = %d\n"</span>, buf->current);
<a name="l00372"></a>00372 printf(<span class="stringliteral">"\tcapacity = %d\t"</span>, buf->capacity);
<a name="l00373"></a>00373 printf(<span class="stringliteral">"\thead row number = %d\n"</span>, buf->received);
<a name="l00374"></a>00374 }
<a name="l00375"></a>00375
<a name="l00376"></a>00376 <span class="comment">/* * * Functions called only by public db-lib API take DBPROCESS* * */</span>
<a name="l00377"></a>00377
<a name="l00394"></a>00394 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00395"></a>00395 buffer_current_index(<span class="keyword">const</span> <a class="code" href="a00098.html">DBPROCESS</a> *dbproc)
<a name="l00396"></a>00396 {
<a name="l00397"></a>00397 <span class="keyword">const</span> <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf = &dbproc->row_buf;
<a name="l00398"></a>00398 <span class="preprocessor">#if 0</span>
<a name="l00399"></a>00399 <span class="preprocessor"></span> buffer_struct_print(buf);
<a name="l00400"></a>00400 <span class="preprocessor">#endif</span>
<a name="l00401"></a>00401 <span class="preprocessor"></span> <span class="keywordflow">if</span> (buf->capacity <= 1) <span class="comment">/* no buffering */</span>
<a name="l00402"></a>00402 <span class="keywordflow">return</span> -1;
<a name="l00403"></a>00403 <span class="keywordflow">if</span> (buf->current == buf->head || buf->current == buf->capacity)
<a name="l00404"></a>00404 <span class="keywordflow">return</span> -1;
<a name="l00405"></a>00405
<a name="l00406"></a>00406 assert(buf->current >= 0);
<a name="l00407"></a>00407 assert(buf->current < buf->capacity);
<a name="l00408"></a>00408
<a name="l00409"></a>00409 <span class="keywordflow">if</span>( buf->tail < buf->head) {
<a name="l00410"></a>00410 assert(buf->tail < buf->current);
<a name="l00411"></a>00411 assert(buf->current < buf->head);
<a name="l00412"></a>00412 } <span class="keywordflow">else</span> {
<a name="l00413"></a>00413 <span class="keywordflow">if</span> (buf->current > buf->head)
<a name="l00414"></a>00414 assert(buf->current > buf->tail);
<a name="l00415"></a>00415 }
<a name="l00416"></a>00416 <span class="keywordflow">return</span> buf->current;
<a name="l00417"></a>00417 }
<a name="l00418"></a>00418
<a name="l00419"></a>00419 <span class="comment">/*</span>
<a name="l00420"></a>00420 <span class="comment"> * Normally called by dbsetopt() to prepare for buffering</span>
<a name="l00421"></a>00421 <span class="comment"> * Called with nrows == 0 by dbopen to safely set buf->rows to NULL. </span>
<a name="l00422"></a>00422 <span class="comment"> */</span>
<a name="l00423"></a>00423 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00424"></a>00424 buffer_set_capacity(<a class="code" href="a00098.html">DBPROCESS</a> *dbproc, <span class="keywordtype">int</span> nrows)
<a name="l00425"></a>00425 {
<a name="l00426"></a>00426 <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf = &dbproc->row_buf;
<a name="l00427"></a>00427
<a name="l00428"></a>00428 buffer_free(buf);
<a name="l00429"></a>00429
<a name="l00430"></a>00430 memset(buf, 0, <span class="keyword">sizeof</span>(<a class="code" href="a00084.html">DBPROC_ROWBUF</a>));
<a name="l00431"></a>00431
<a name="l00432"></a>00432 <span class="keywordflow">if</span> (0 == nrows) {
<a name="l00433"></a>00433 buf->capacity = 1;
<a name="l00434"></a>00434 BUFFER_CHECK(buf);
<a name="l00435"></a>00435 <span class="keywordflow">return</span>;
<a name="l00436"></a>00436 }
<a name="l00437"></a>00437
<a name="l00438"></a>00438 assert(0 < nrows);
<a name="l00439"></a>00439
<a name="l00440"></a>00440 buf->capacity = nrows;
<a name="l00441"></a>00441 BUFFER_CHECK(buf);
<a name="l00442"></a>00442 }
<a name="l00443"></a>00443
<a name="l00444"></a>00444 <span class="comment">/*</span>
<a name="l00445"></a>00445 <span class="comment"> * Called only by dbresults(); capacity must be >= 1. </span>
<a name="l00446"></a>00446 <span class="comment"> * Sybase's documents say dbresults() cannot return FAIL if the prior calls worked, </span>
<a name="l00447"></a>00447 <span class="comment"> * which is a little strange, because (for FreeTDS, at least), dbresults</span>
<a name="l00448"></a>00448 <span class="comment"> * is when we learn about the result set's width. Without that information, we</span>
<a name="l00449"></a>00449 <span class="comment"> * can't allocate memory for the buffer. But if we *fail* to allocate memory, </span>
<a name="l00450"></a>00450 <span class="comment"> * we're not to communicate it back to the caller? </span>
<a name="l00451"></a>00451 <span class="comment"> */</span>
<a name="l00452"></a>00452 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00453"></a>00453 buffer_alloc(<a class="code" href="a00098.html">DBPROCESS</a> *dbproc)
<a name="l00454"></a>00454 {
<a name="l00455"></a>00455 <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf = &dbproc->row_buf;
<a name="l00456"></a>00456
<a name="l00457"></a>00457 <span class="comment">/* Call this function only after setting capacity. */</span>
<a name="l00458"></a>00458
<a name="l00459"></a>00459 assert(buf);
<a name="l00460"></a>00460 assert(buf->capacity > 0);
<a name="l00461"></a>00461 assert(buf->rows == NULL);
<a name="l00462"></a>00462
<a name="l00463"></a>00463 buf->rows = (<a class="code" href="a00057.html">DBLIB_BUFFER_ROW</a> *) calloc(buf->capacity, <span class="keyword">sizeof</span>(<a class="code" href="a00057.html">DBLIB_BUFFER_ROW</a>));
<a name="l00464"></a>00464
<a name="l00465"></a>00465 assert(buf->rows);
<a name="l00466"></a>00466
<a name="l00467"></a>00467 buffer_reset(buf);
<a name="l00468"></a>00468
<a name="l00469"></a>00469 buf->received = 0;
<a name="l00470"></a>00470 }
<a name="l00471"></a>00471
<a name="l00476"></a>00476 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00477"></a>00477 buffer_add_row(<a class="code" href="a00098.html">DBPROCESS</a> *dbproc, <a class="code" href="a00118.html" title="Hold information for any results.">TDSRESULTINFO</a> *resinfo)
<a name="l00478"></a>00478 {
<a name="l00479"></a>00479 <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf = &dbproc->row_buf;
<a name="l00480"></a>00480 <a class="code" href="a00057.html">DBLIB_BUFFER_ROW</a> *row;
<a name="l00481"></a>00481 <span class="keywordtype">int</span> i;
<a name="l00482"></a>00482
<a name="l00483"></a>00483 assert(buf->capacity >= 0);
<a name="l00484"></a>00484
<a name="l00485"></a>00485 <span class="keywordflow">if</span> (buffer_is_full(buf))
<a name="l00486"></a>00486 <span class="keywordflow">return</span> -1;
<a name="l00487"></a>00487
<a name="l00488"></a>00488 row = buffer_row_address(buf, buf->head);
<a name="l00489"></a>00489
<a name="l00490"></a>00490 <span class="comment">/* bump the row number, write it, and move the data to head */</span>
<a name="l00491"></a>00491 <span class="keywordflow">if</span> (row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>) {
<a name="l00492"></a>00492 tds_free_row(row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>, row-><a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a>);
<a name="l00493"></a>00493 tds_free_results(row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>);
<a name="l00494"></a>00494 }
<a name="l00495"></a>00495 row-><a class="code" href="a00057.html#a015599345b266045d8bd3fac731e4675" title="row number">row</a> = ++buf->received;
<a name="l00496"></a>00496 ++resinfo->ref_count;
<a name="l00497"></a>00497 row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a> = resinfo;
<a name="l00498"></a>00498 row-><a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a> = NULL;
<a name="l00499"></a>00499 <span class="keywordflow">if</span> (row-><a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a" title="save old sizes">sizes</a>)
<a name="l00500"></a>00500 free(row-><a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a" title="save old sizes">sizes</a>);
<a name="l00501"></a>00501 row-><a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a" title="save old sizes">sizes</a> = (TDS_INT *) calloc(resinfo->num_cols, <span class="keyword">sizeof</span>(TDS_INT));
<a name="l00502"></a>00502 <span class="keywordflow">for</span> (i = 0; i < resinfo->num_cols; ++i)
<a name="l00503"></a>00503 row-><a class="code" href="a00057.html#abe1aa9f8ea96dda1400654813e68130a" title="save old sizes">sizes</a>[i] = resinfo->columns[i]-><a class="code" href="a00092.html#ada14ba479a67762fc1bef78910ef4beb" title="size written in variable (ie: char, text, binary).">column_cur_size</a>;
<a name="l00504"></a>00504
<a name="l00505"></a>00505 <span class="comment">/* initial condition is head == 0 and tail == capacity */</span>
<a name="l00506"></a>00506 if (buf->tail == buf->capacity) {
<a name="l00507"></a>00507 <span class="comment">/* bumping this tail will set it to zero */</span>
<a name="l00508"></a>00508 assert(buf->head == 0);
<a name="l00509"></a>00509 buf->tail = 0;
<a name="l00510"></a>00510 }
<a name="l00511"></a>00511
<a name="l00512"></a>00512 <span class="comment">/* update current, bump the head */</span>
<a name="l00513"></a>00513 buf->current = buf->head;
<a name="l00514"></a>00514 buf->head = buffer_idx_increment(buf, buf->head);
<a name="l00515"></a>00515
<a name="l00516"></a>00516 <span class="keywordflow">return</span> buf->current;
<a name="l00517"></a>00517 }
<a name="l00518"></a>00518
<a name="l00519"></a>00519 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00520"></a>00520 buffer_save_row(<a class="code" href="a00098.html">DBPROCESS</a> *dbproc)
<a name="l00521"></a>00521 {
<a name="l00522"></a>00522 <a class="code" href="a00084.html">DBPROC_ROWBUF</a> *buf = &dbproc->row_buf;
<a name="l00523"></a>00523 <a class="code" href="a00057.html">DBLIB_BUFFER_ROW</a> *row;
<a name="l00524"></a>00524 <span class="keywordtype">int</span> idx = buf->head - 1;
<a name="l00525"></a>00525
<a name="l00526"></a>00526 <span class="keywordflow">if</span> (buf->capacity <= 1)
<a name="l00527"></a>00527 <span class="keywordflow">return</span> SUCCEED;
<a name="l00528"></a>00528
<a name="l00529"></a>00529 <span class="keywordflow">if</span> (idx < 0)
<a name="l00530"></a>00530 idx = buf->capacity - 1;
<a name="l00531"></a>00531 <span class="keywordflow">if</span> (idx >= 0 && idx < buf->capacity) {
<a name="l00532"></a>00532 row = &buf->rows[idx];
<a name="l00533"></a>00533
<a name="l00534"></a>00534 <span class="keywordflow">if</span> (row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a> && !row-><a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a>) {
<a name="l00535"></a>00535 row-><a class="code" href="a00057.html#a5a057d6bbecfac1a85a9fbcd09eaf3a0" title="row data, NULL for resinfo-&gt;current_row">row_data</a> = row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>->current_row;
<a name="l00536"></a>00536 <a class="code" href="a00300.html#ga2593825c7b2d819c32043e3130724d83" title="Allocate space for row store return NULL on out of memory.">tds_alloc_row</a>(row-><a class="code" href="a00057.html#ad49b82677ae277e5d5b0038f522da293" title="pointer to result informations">resinfo</a>);
<a name="l00537"></a>00537 }
<a name="l00538"></a>00538 }
<a name="l00539"></a>00539
<a name="l00540"></a>00540 <span class="keywordflow">return</span> SUCCEED;
<a name="l00541"></a>00541 }
<a name="l00542"></a>00542
</pre></div></div>
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distrib
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Mageia
>
5
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x86_64
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media
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core-release
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by-pkgid
>
13eec89779171a321fe518ddb0e0fec6
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files
>
196
