57 lines
1.8 KiB
XML
57 lines
1.8 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<refentry id="scupdaterecord">
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<refentryinfo><title>OpenSC API Reference</title></refentryinfo>
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<refmeta>
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<refentrytitle>sc_update_record</refentrytitle>
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<manvolnum>3</manvolnum>
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<refmiscinfo>opensc</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>sc_update_record</refname>
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<refpurpose>Write a record to an existing file</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Synopsis</title>
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<para>
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<programlisting>
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#include <opensc.h>
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int sc_update_record(struct sc_card *card, unsigned int record,
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const unsigned char *buf, size_t buflen,
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unsigned long flags);
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</programlisting>
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</para>
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</refsect1>
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<refsect1>
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<title>Description</title>
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<para>
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This function writes a record that is <emphasis>buflen</emphasis> bytes long from the buffer
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pointed to by <emphasis>buf</emphasis> to a record-structured elementary file (EF) on
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<emphasis>card</emphasis>. The function corresponds to the ISO
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7816 UPDATE RECORD function. Call <link linkend="scselectfile">sc_select_file()</link>
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first to select the file to write to.
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</para>
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<para>
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<emphasis>record</emphasis> specifies the ID of the record to be written, or, if
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<emphasis>flags</emphasis> is set to <symbol>SC_RECORD_BY_REC_NR</symbol>, the record number. If
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<emphasis>record</emphasis> is set to zero, the current record will be read.
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</para>
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<para>
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This function can be used for overwriting existing records only; for appending to
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files, see the <link linkend="scappendrecord">sc_append_record()</link> function.
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</para>
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</refsect1>
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<refsect1>
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<title>Return value</title>
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<para>
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Returns the number of bytes written if successful, or a negative value in case of error.
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</para>
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</refsect1>
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</refentry>
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