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<title>FreeTDS API: Dynamic string functions</title>
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<h1>Dynamic string functions<br/>
<small>
[<a class="el" href="a00305.html">LibTDS API</a>]</small>
</h1>
<p>Handle dynamic string.
<a href="#_details">More...</a></p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="gac8f285afaf69f0484490bb2f14c85209"></a><!-- doxytag: member="dstring::tds_dstr_buf" ref="gac8f285afaf69f0484490bb2f14c85209" args="(s)" -->
#define </td><td class="memItemRight" valign="bottom"><b>tds_dstr_buf</b>(s) ((s)->dstr_s)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ga2a392bcd7cde3707f817a304eeccd656"></a><!-- doxytag: member="dstring::tds_dstr_cstr" ref="ga2a392bcd7cde3707f817a304eeccd656" args="(s)" -->
#define </td><td class="memItemRight" valign="bottom"><b>tds_dstr_cstr</b>(s) ((const char* ) tds_dstr_buf(s))</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="gacd1cdcff8bce3a76e63240798edc9dcb"></a><!-- doxytag: member="dstring::tds_dstr_init" ref="gacd1cdcff8bce3a76e63240798edc9dcb" args="(s)" -->
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="a00303.html#gacd1cdcff8bce3a76e63240798edc9dcb">tds_dstr_init</a>(s) do { <a class="el" href="a00100.html">DSTR</a> *_tds_s = (s); _tds_s->dstr_size = 0; _tds_s->dstr_s = (char*) tds_str_empty; } while(0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">init a string with empty <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="gaefed660833fb5beb2b5c7998c565a76c"></a><!-- doxytag: member="dstring::tds_dstr_isempty" ref="gaefed660833fb5beb2b5c7998c565a76c" args="(s)" -->
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="a00303.html#gaefed660833fb5beb2b5c7998c565a76c">tds_dstr_isempty</a>(s) ((s)->dstr_size == 0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">test if string is empty <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="gace8da9c35a72230925e729fb4975cc97"></a><!-- doxytag: member="dstring::tds_dstr_len" ref="gace8da9c35a72230925e729fb4975cc97" args="(s)" -->
#define </td><td class="memItemRight" valign="bottom"><b>tds_dstr_len</b>(s) ((s)->dstr_size)</td></tr>
<tr><td colspan="2"><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="a00100.html">DSTR</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a00303.html#ga6aa14b8b717b51afcfb65bd55143689d">tds_dstr_alloc</a> (<a class="el" href="a00100.html">DSTR</a> *s, size_t length)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">allocate space for length char <a href="#ga6aa14b8b717b51afcfb65bd55143689d"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="a00100.html">DSTR</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a00303.html#gad96366d9fa93bfc283cef1299fbe97ab">tds_dstr_copy</a> (<a class="el" href="a00100.html">DSTR</a> *s, const char *src)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">copy a string from another <a href="#gad96366d9fa93bfc283cef1299fbe97ab"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="a00100.html">DSTR</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a00303.html#ga656718f240d7403f986ae887d84a6ca1">tds_dstr_copyn</a> (<a class="el" href="a00100.html">DSTR</a> *s, const char *src, size_t length)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set string to a given buffer of characters. <a href="#ga656718f240d7403f986ae887d84a6ca1"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ga4e6d9fa6f9b9551a5a3390e10a5322e6"></a><!-- doxytag: member="dstring::tds_dstr_dup" ref="ga4e6d9fa6f9b9551a5a3390e10a5322e6" args="(DSTR *s, const DSTR *src)" -->
<a class="el" href="a00100.html">DSTR</a> * </td><td class="memItemRight" valign="bottom"><b>tds_dstr_dup</b> (<a class="el" href="a00100.html">DSTR</a> *s, const <a class="el" href="a00100.html">DSTR</a> *src)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="gaccd1c1c8ff938813578123963212388c"></a><!-- doxytag: member="dstring::tds_dstr_free" ref="gaccd1c1c8ff938813578123963212388c" args="(DSTR *s)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00303.html#gaccd1c1c8ff938813578123963212388c">tds_dstr_free</a> (<a class="el" href="a00100.html">DSTR</a> *s)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">free string <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="a00100.html">DSTR</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a00303.html#gab78cc59b110df2817b00f9bed74c6ff1">tds_dstr_set</a> (<a class="el" href="a00100.html">DSTR</a> *s, char *src)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">set a string from another buffer. <a href="#gab78cc59b110df2817b00f9bed74c6ff1"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="a00100.html">DSTR</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="a00303.html#ga0cd7863ba7c2d2da4a193234472a3d14">tds_dstr_setlen</a> (<a class="el" href="a00100.html">DSTR</a> *s, size_t length)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">limit length of string, MUST be <= current length <a href="#ga0cd7863ba7c2d2da4a193234472a3d14"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ga339ba30216e2bd5bd076aa9dcd26f3c4"></a><!-- doxytag: member="dstring::tds_dstr_zero" ref="ga339ba30216e2bd5bd076aa9dcd26f3c4" args="(DSTR *s)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00303.html#ga339ba30216e2bd5bd076aa9dcd26f3c4">tds_dstr_zero</a> (<a class="el" href="a00100.html">DSTR</a> *s)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">clear all string filling with zeroes (mainly for security reason) <br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>Handle dynamic string. </p>
<p>In this string are always valid (you don't have NULL pointer, only empty string) </p>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="ga6aa14b8b717b51afcfb65bd55143689d"></a><!-- doxytag: member="tdsstring.c::tds_dstr_alloc" ref="ga6aa14b8b717b51afcfb65bd55143689d" args="(DSTR *s, size_t length)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="a00100.html">DSTR</a> * tds_dstr_alloc </td>
<td>(</td>
<td class="paramtype"><a class="el" href="a00100.html">DSTR</a> * </td>
<td class="paramname"> <em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>length</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>allocate space for length char </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>s</em> </td><td>dynamic string </td></tr>
<tr><td valign="top"></td><td valign="top"><em>length</em> </td><td>new length </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>string allocated or NULL on memory error </dd></dl>
</div>
</div>
<a class="anchor" id="gad96366d9fa93bfc283cef1299fbe97ab"></a><!-- doxytag: member="tdsstring.c::tds_dstr_copy" ref="gad96366d9fa93bfc283cef1299fbe97ab" args="(DSTR *s, const char *src)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="a00100.html">DSTR</a> * tds_dstr_copy </td>
<td>(</td>
<td class="paramtype"><a class="el" href="a00100.html">DSTR</a> * </td>
<td class="paramname"> <em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>src</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>copy a string from another </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>s</em> </td><td>dynamic string </td></tr>
<tr><td valign="top"></td><td valign="top"><em>src</em> </td><td>source buffer </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>string copied or NULL on memory error </dd></dl>
</div>
</div>
<a class="anchor" id="ga656718f240d7403f986ae887d84a6ca1"></a><!-- doxytag: member="tdsstring.c::tds_dstr_copyn" ref="ga656718f240d7403f986ae887d84a6ca1" args="(DSTR *s, const char *src, size_t length)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="a00100.html">DSTR</a> * tds_dstr_copyn </td>
<td>(</td>
<td class="paramtype"><a class="el" href="a00100.html">DSTR</a> * </td>
<td class="paramname"> <em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>length</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Set string to a given buffer of characters. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>s</em> </td><td>dynamic string </td></tr>
<tr><td valign="top"></td><td valign="top"><em>src</em> </td><td>source buffer </td></tr>
<tr><td valign="top"></td><td valign="top"><em>length</em> </td><td>length of source buffer </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>string copied or NULL on memory error </dd></dl>
</div>
</div>
<a class="anchor" id="gab78cc59b110df2817b00f9bed74c6ff1"></a><!-- doxytag: member="tdsstring.c::tds_dstr_set" ref="gab78cc59b110df2817b00f9bed74c6ff1" args="(DSTR *s, char *src)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="a00100.html">DSTR</a> * tds_dstr_set </td>
<td>(</td>
<td class="paramtype"><a class="el" href="a00100.html">DSTR</a> * </td>
<td class="paramname"> <em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">char * </td>
<td class="paramname"> <em>src</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>set a string from another buffer. </p>
<p>The string will use the supplied buffer (it not copy the string), so it should be a pointer returned by malloc. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>s</em> </td><td>dynamic string </td></tr>
<tr><td valign="top"></td><td valign="top"><em>src</em> </td><td>source buffer </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>string copied or NULL on memory error </dd></dl>
</div>
</div>
<a class="anchor" id="ga0cd7863ba7c2d2da4a193234472a3d14"></a><!-- doxytag: member="tdsstring.c::tds_dstr_setlen" ref="ga0cd7863ba7c2d2da4a193234472a3d14" args="(DSTR *s, size_t length)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="a00100.html">DSTR</a> * tds_dstr_setlen </td>
<td>(</td>
<td class="paramtype"><a class="el" href="a00100.html">DSTR</a> * </td>
<td class="paramname"> <em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>length</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>limit length of string, MUST be <= current length </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>s</em> </td><td>dynamic string </td></tr>
<tr><td valign="top"></td><td valign="top"><em>length</em> </td><td>new length </td></tr>
</table>
</dd>
</dl>
</div>
</div>
</div>
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