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.\"Generated by db2man.xsl. Don't modify this, modify the source.
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.TH "SC_UPDATE_RECORD" 3 "" "" "OpenSC API Reference"
.SH NAME
sc_update_record \- Write a record to an existing file
.SH "SYNOPSIS"
.PP
.nf
#include <opensc\&.h>
int sc_update_record(struct sc_card *card, unsigned int record,
const unsigned char *buf, size_t buflen,
unsigned long flags);
.fi
.SH "DESCRIPTION"
.PP
This function writes a record that is \fIbuflen\fR bytes long from the buffer pointed to by \fIbuf\fR to a record\-structured elementary file (EF) on\fIcard\fR\&. The function corresponds to the ISO 7816 UPDATE RECORD function\&. Call sc_select_file() first to select the file to write to\&.
.PP
\fIrecord\fR specifies the ID of the record to be written, or, if\fIflags\fR is set to SC_RECORD_BY_REC_NR, the record number\&. If\fIrecord\fR is set to zero, the current record will be read\&.
.PP
This function can be used for overwriting existing records only; for appending to files, see the sc_append_record() function\&.
.SH "RETURN VALUE"
.PP
Returns the number of bytes written if successful, or a negative value in case of error\&.
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