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<html>
<head>
<meta name="keywords" content="eso, FITS format, C library">
<link href="doxygen.css" rel="stylesheet" type="text/css">
<title>QFITS Reference Manual 6.2.0</title>
</head>
<body text="#000000" bgcolor="#ffffff">
<!-- Generated by Doxygen 1.4.1 -->
<h1>FITS header handling</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">qfits_header * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga0">qfits_header_new</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">FITS header constructor. <a href="#ga0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">qfits_header * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga1">qfits_header_default</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">FITS header default constructor. <a href="#ga1"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga2">qfits_header_add</a> (qfits_header *hdr, const char *key, const char *val, const char *com, const char *lin)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Add a new card to a FITS header. <a href="#ga2"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga3">qfits_header_add_after</a> (qfits_header *hdr, const char *after, const char *key, const char *val, const char *com, const char *lin)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">add a new card to a FITS header <a href="#ga3"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga4">qfits_header_append</a> (qfits_header *hdr, const char *key, const char *val, const char *com, const char *lin)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Append a new card to a FITS header. <a href="#ga4"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga5">qfits_header_del</a> (qfits_header *hdr, const char *key)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Delete a card in a FITS header. <a href="#ga5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga6">qfits_header_mod</a> (qfits_header *hdr, const char *key, const char *val, const char *com)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Modifies a FITS card. <a href="#ga6"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga7">qfits_header_sort</a> (qfits_header **hdr)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sort a FITS header. <a href="#ga7"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">qfits_header * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga8">qfits_header_copy</a> (const qfits_header *src)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Copy a FITS header. <a href="#ga8"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga9">qfits_header_destroy</a> (qfits_header *hdr)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">qfits_header destructor <a href="#ga9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga10">qfits_header_getstr</a> (const qfits_header *hdr, const char *key)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the value associated to a key, as a string. <a href="#ga10"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga11">qfits_header_getitem</a> (const qfits_header *hdr, int idx, char *key, char *val, char *com, char *lin)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the i-th key/val/com/line tuple in a header. <a href="#ga11"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga12">qfits_header_getcom</a> (const qfits_header *hdr, const char *key)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the comment associated to a key, as a string. <a href="#ga12"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga13">qfits_header_getint</a> (const qfits_header *hdr, const char *key, int errval)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the value associated to a key, as an int. <a href="#ga13"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga14">qfits_header_getdouble</a> (const qfits_header *hdr, const char *key, double errval)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the value associated to a key, as a double. <a href="#ga14"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga15">qfits_header_getboolean</a> (const qfits_header *hdr, const char *key, int errval)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the value associated to a key, as a boolean (int). <a href="#ga15"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__qfits__header.html#ga16">qfits_header_dump</a> (const qfits_header *hdr, FILE *out)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Dump a FITS header to an opened file. <a href="#ga16"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
This file contains definition and related methods for the FITS header structure. This structure is meant to remain opaque to the user, who only accesses it through the dedicated functions.<p>
The 'keytuple' type is strictly internal to this module. It describes FITS cards as tuples (key,value,comment,line), where key is always a non-NULL character string, value and comment are allowed to be NULL. 'line' is a string containing the line as it has been read from the input FITS file (raw). It is set to NULL if the card is modified later. This allows in output two options: either reconstruct the FITS lines by printing key = value / comment in a FITS-compliant way, or output the lines as they were found in input, except for the modified ones.<p>
The following functions are associated methods to this data structure:<p>
<ul>
<li>keytuple_new() constructor</li><li>keytuple_del() destructor</li><li>keytuple_dmp() dumps a keytuple to stdout </li></ul>
<hr><h2>Function Documentation</h2>
<a class="anchor" name="ga2" doxytag="qfits_header.c::qfits_header_add"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void qfits_header_add </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>key</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>val</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>com</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>lin</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Add a new card to a FITS header.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>qfits_header object to modify </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>FITS key </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>FITS value </td></tr>
<tr><td valign="top"></td><td valign="top"><em>com</em> </td><td>FITS comment </td></tr>
<tr><td valign="top"></td><td valign="top"><em>lin</em> </td><td>FITS original line if exists </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>void</dd></dl>
This function adds a new card into a header, at the one-before-last position, i.e. the entry just before the END entry if it is there. The key must always be a non-NULL string, all other input parameters are allowed to get NULL values. </td>
</tr>
</table>
<a class="anchor" name="ga3" doxytag="qfits_header.c::qfits_header_add_after"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void qfits_header_add_after </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>after</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>key</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>val</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>com</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>lin</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
add a new card to a FITS header
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>qfits_header object to modify </td></tr>
<tr><td valign="top"></td><td valign="top"><em>after</em> </td><td>Key to specify insertion place </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>FITS key </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>FITS value </td></tr>
<tr><td valign="top"></td><td valign="top"><em>com</em> </td><td>FITS comment </td></tr>
<tr><td valign="top"></td><td valign="top"><em>lin</em> </td><td>FITS original line if exists </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>void</dd></dl>
Adds a new card to a FITS header, after the specified key. Nothing happens if the specified key is not found in the header. All fields can be NULL, except after and key. </td>
</tr>
</table>
<a class="anchor" name="ga4" doxytag="qfits_header.c::qfits_header_append"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void qfits_header_append </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>key</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>val</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>com</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>lin</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Append a new card to a FITS header.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>qfits_header object to modify </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>FITS key </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>FITS value </td></tr>
<tr><td valign="top"></td><td valign="top"><em>com</em> </td><td>FITS comment </td></tr>
<tr><td valign="top"></td><td valign="top"><em>lin</em> </td><td>FITS original line if exists </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>void</dd></dl>
Adds a new card in a FITS header as the last one. All fields can be NULL except key. </td>
</tr>
</table>
<a class="anchor" name="ga8" doxytag="qfits_header.c::qfits_header_copy"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">qfits_header* qfits_header_copy </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const qfits_header * </td>
<td class="mdname1" valign="top" nowrap> <em>src</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Copy a FITS header.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>src</em> </td><td>Header to replicate </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>Pointer to newly allocated qfits_header object.</dd></dl>
Makes a strict copy of all information contained in the source header. The returned header must be freed using qfits_header_destroy. </td>
</tr>
</table>
<a class="anchor" name="ga1" doxytag="qfits_header.c::qfits_header_default"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">qfits_header* qfits_header_default </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
FITS header default constructor.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>1 newly allocated qfits_header object.</dd></dl>
This is a secondary constructor for a qfits_header object. It returns an allocated linked-list handler containing two cards: the first one (SIMPLE=T) and the last one (END). </td>
</tr>
</table>
<a class="anchor" name="ga5" doxytag="qfits_header.c::qfits_header_del"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void qfits_header_del </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>key</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Delete a card in a FITS header.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>qfits_header to modify </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>specifies which card to remove </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>void</dd></dl>
Removes a card from a FITS header. The first found card that matches the key is removed. </td>
</tr>
</table>
<a class="anchor" name="ga9" doxytag="qfits_header.c::qfits_header_destroy"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void qfits_header_destroy </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">qfits_header * </td>
<td class="mdname1" valign="top" nowrap> <em>hdr</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
qfits_header destructor
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>qfits_header to deallocate </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>void</dd></dl>
Frees all memory associated to a given qfits_header object. </td>
</tr>
</table>
<a class="anchor" name="ga16" doxytag="qfits_header.c::qfits_header_dump"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">int qfits_header_dump </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>FILE * </td>
<td class="mdname" nowrap> <em>out</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Dump a FITS header to an opened file.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>FITS header to dump </td></tr>
<tr><td valign="top"></td><td valign="top"><em>out</em> </td><td>Opened file pointer </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>int 0 if Ok, -1 otherwise Dumps a FITS header to an opened file pointer. </dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="ga15" doxytag="qfits_header.c::qfits_header_getboolean"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">int qfits_header_getboolean </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>key</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>int </td>
<td class="mdname" nowrap> <em>errval</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Return the value associated to a key, as a boolean (int).
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>qfits_header to parse </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>key to find </td></tr>
<tr><td valign="top"></td><td valign="top"><em>errval</em> </td><td>default value to return if nothing is found </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>int</dd></dl>
Finds the value associated to the given key and return it as a boolean. Returns errval if no matching key is found or no value is attached. A boolean is here understood as an int taking the value 0 or 1. errval can be set to any other integer value to reflect that nothing was found.<p>
errval is returned if no matching key is found or no value is attached.<p>
A true value is any character string beginning with a 'y' (yes), a 't' (true) or the digit '1'. A false value is any character string beginning with a 'n' (no), a 'f' (false) or the digit '0'. </td>
</tr>
</table>
<a class="anchor" name="ga12" doxytag="qfits_header.c::qfits_header_getcom"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">char* qfits_header_getcom </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>key</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Return the comment associated to a key, as a string.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>qfits_header to parse </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>key to find </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>pointer to statically allocated string</dd></dl>
Finds the comment associated to the given key and return it as a string. The returned pointer is statically allocated, so do not modify its contents or try to free it.<p>
Returns NULL if no matching key is found or no comment is attached. </td>
</tr>
</table>
<a class="anchor" name="ga14" doxytag="qfits_header.c::qfits_header_getdouble"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">double qfits_header_getdouble </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>key</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>double </td>
<td class="mdname" nowrap> <em>errval</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Return the value associated to a key, as a double.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>qfits_header to parse </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>key to find </td></tr>
<tr><td valign="top"></td><td valign="top"><em>errval</em> </td><td>default value to return if nothing is found </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>double</dd></dl>
Finds the value associated to the given key and return it as a double. Returns errval if no matching key is found or no value is attached. </td>
</tr>
</table>
<a class="anchor" name="ga13" doxytag="qfits_header.c::qfits_header_getint"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">int qfits_header_getint </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>key</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>int </td>
<td class="mdname" nowrap> <em>errval</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Return the value associated to a key, as an int.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>qfits_header to parse </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>key to find </td></tr>
<tr><td valign="top"></td><td valign="top"><em>errval</em> </td><td>default value to return if nothing is found </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>int</dd></dl>
Finds the value associated to the given key and return it as an int. Returns errval if no matching key is found or no value is attached. </td>
</tr>
</table>
<a class="anchor" name="ga11" doxytag="qfits_header.c::qfits_header_getitem"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">int qfits_header_getitem </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>int </td>
<td class="mdname" nowrap> <em>idx</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>char * </td>
<td class="mdname" nowrap> <em>key</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>char * </td>
<td class="mdname" nowrap> <em>val</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>char * </td>
<td class="mdname" nowrap> <em>com</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>char * </td>
<td class="mdname" nowrap> <em>lin</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Return the i-th key/val/com/line tuple in a header.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>Header to consider </td></tr>
<tr><td valign="top"></td><td valign="top"><em>idx</em> </td><td>Index of the requested card </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>Output key </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>Output value </td></tr>
<tr><td valign="top"></td><td valign="top"><em>com</em> </td><td>Output comment </td></tr>
<tr><td valign="top"></td><td valign="top"><em>lin</em> </td><td>Output initial line </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>int 0 if Ok, -1 if error occurred.</dd></dl>
This function is useful to browse a FITS header object card by card. By iterating on the number of cards (available in the 'n' field of the qfits_header struct), you can retrieve the FITS lines and their components one by one. Indexes run from 0 to n-1. You can pass NULL values for key, val, com or lin if you are not interested in a given field.<p>
<div class="fragment"><pre class="fragment"> <span class="keywordtype">int</span> i ;
<span class="keywordtype">char</span> key[FITS_LINESZ+1] ;
<span class="keywordtype">char</span> val[FITS_LINESZ+1] ;
<span class="keywordtype">char</span> com[FITS_LINESZ+1] ;
<span class="keywordtype">char</span> lin[FITS_LINESZ+1] ;
<span class="keywordflow">for</span> (i=0 ; i<hdr->n ; i++) {
<a class="code" href="group__qfits__header.html#ga11">qfits_header_getitem</a>(hdr, i, key, val, com, lin);
printf(<span class="stringliteral">"card[%d] key[%s] val[%s] com[%s]\n"</span>, i, key, val, com);
}
</pre></div><p>
This function has primarily been written to interface a qfits_header object to other languages (C++/Python). If you are working within a C program, you should use the other header manipulation routines available in this module. </td>
</tr>
</table>
<a class="anchor" name="ga10" doxytag="qfits_header.c::qfits_header_getstr"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">char* qfits_header_getstr </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>key</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Return the value associated to a key, as a string.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>qfits_header to parse </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>key to find </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>pointer to statically allocated string</dd></dl>
Finds the value associated to the given key and return it as a string. The returned pointer is statically allocated, so do not modify its contents or try to free it.<p>
Returns NULL if no matching key is found or no value is attached. </td>
</tr>
</table>
<a class="anchor" name="ga6" doxytag="qfits_header.c::qfits_header_mod"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void qfits_header_mod </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">qfits_header * </td>
<td class="mdname" nowrap> <em>hdr</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>key</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>val</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>com</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Modifies a FITS card.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>qfits_header to modify </td></tr>
<tr><td valign="top"></td><td valign="top"><em>key</em> </td><td>FITS key </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>FITS value </td></tr>
<tr><td valign="top"></td><td valign="top"><em>com</em> </td><td>FITS comment </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>void</dd></dl>
Finds the first card in the header matching 'key', and replaces its value and comment fields by the provided values. The initial FITS line is set to NULL in the card. </td>
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<a class="anchor" name="ga0" doxytag="qfits_header.c::qfits_header_new"></a><p>
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<td class="md" nowrap valign="top">qfits_header* qfits_header_new </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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FITS header constructor.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>1 newly allocated (empty) qfits_header object.</dd></dl>
This is the main constructor for a qfits_header object. It returns an allocated linked-list handler with an empty card list. </td>
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<a class="anchor" name="ga7" doxytag="qfits_header.c::qfits_header_sort"></a><p>
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<td class="md" nowrap valign="top">int qfits_header_sort </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">qfits_header ** </td>
<td class="mdname1" valign="top" nowrap> <em>hdr</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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<p>
Sort a FITS header.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>hdr</em> </td><td>Header to sort (modified) </td></tr>
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<dl compact><dt><b>Returns:</b></dt><dd>-1 in error case, 0 otherwise </dd></dl>
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