<?xml version="1.0" encoding="UTF-8"?>
<!--
 * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
 * Copyright (C) 2008 - INRIA
 * ...
 *
 * Copyright (C) 2012 - 2016 - Scilab Enterprises
 *
 * This file is hereby licensed under the terms of the GNU GPL v2.0,
 * pursuant to article 5.3.4 of the CeCILL v.2.1.
 * This file was originally licensed under the terms of the CeCILL v2.1,
 * and continues to be available under such terms.
 * For more information, see the COPYING file which you should have received
 * along with this program.
 *
 -->
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:ns4="http://www.w3.org/1999/xhtml" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:id="mfscanf" xml:lang="en">
    <refnamediv>
        <refname>mfscanf</refname>
        <refpurpose>
            reads input from the stream pointer stream (interface to the C
            fscanf function)
        </refpurpose>
    </refnamediv>
    <refnamediv xml:id="mscanf">
        <refname>mscanf</refname>
        <refpurpose>
            reads input from the standard input (interface to the C scanf
            function)
        </refpurpose>
    </refnamediv>
    <refnamediv xml:id="msscanf">
        <refname>msscanf</refname>
        <refpurpose>reads its input from the character string (interface to the C
            sscanf function)
        </refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Syntax</title>
        <synopsis>
            [n, v_1,..., v_m] = mfscanf([niter,]fd, format)
            L = mfscanf([niter,] fd,format)

            [n, v_1,..., v_m] = mscanf([niter,] format)
            L = mscanf([niter,]format)

            [n, v_1,..., v_m] = msscanf([niter,]str, format)
            L = msscanf([niter,] str, format)
        </synopsis>
    </refsynopsisdiv>
    <refsection>
        <title>Arguments</title>
        <variablelist>
            <varlistentry>
                <term>format</term>
                <listitem>
                    <para>
                        a Scilab string describing the format to use to write the
                        remaining operands. The <varname>format</varname> operand
                        follows, as close as possible, the C <function>printf</function>
                        format operand syntax as described in
                        <link linkend="scanf_conversion">scanf_conversion</link>.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>fd</term>
                <listitem>
                    <para>
                        a positive integer: a file descriptor returned by the function
                        <function>mopen</function>. The value -1 refers to the last
                        opened file.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>str</term>
                <listitem>
                    <para>a Scilab string or string vector.</para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>niter</term>
                <listitem>
                    <para>
                        an integer: the number of times the
                        <varname>format</varname>
                        to be used.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>n</term>
                <listitem>
                    <para>an integer: the number of data read or -1 if EOL has been
                        encountered before any datum has been read.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>v_i</term>
                <listitem>
                    <para>
                        Each function reads characters, interprets them according to a
                        <varname>format</varname>, and stores the results in its output
                        arguments. If more than <varname>n</varname> output arguments are
                        provided, the last ones <varname>v_n+1, ..., v_m</varname> are
                        set to empty matrices.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>L</term>
                <listitem>
                    <para>
                        if all data are homogeneous they are stored in a unique vector
                        which is returned, otherwise subsequences of same data type are
                        stored in matrices and a <literal>mlist</literal> (with type
                        <literal>cblock</literal>) containing all the built matrices is
                        returned.
                    </para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsection>
    <refsection>
        <title>Description</title>
        <para>
            The <function>mfscanf</function> function reads characters from the
            stream <varname>fd</varname>.
        </para>
        <para>
            The <function>mscanf</function> function reads characters from Scilab
            window.
        </para>
        <para>
            The <function>msscanf</function> function reads characters from the
            Scilab string <varname>str</varname>.
        </para>
        <para>
            The <varname>niter</varname> optional argument specifies how many
            time the format has to used. One iteration produces one line in the output
            matrix. If <code>niter==-1</code> the function iterates up to the
            end of file. The <varname>niter</varname> default value is 1.
        </para>
        <para>Comments about precision:</para>
        <para>
            <function>mfscanf</function> is based on C function
            <function>fscanf</function>. If you use <literal>'%f'</literal>,
            <literal>'%g'</literal>, <literal>'%e'</literal> as format your data
            will be cast to float and returned in a Scilab variable.
        </para>
        <para>
            If this Scilab variable is a double then you can have some precision
            errors. In this case, it is better to use <literal>'%lg'</literal> format.
        </para>
    </refsection>
    <refsection>
        <title>Examples</title>
        <programlisting role="example"><![CDATA[
//----------------------------------------------------------
//--    Simple use                                        --
//----------------------------------------------------------
s='1 1.3'  //a string
[n,a,b]=msscanf(s,"%i %e")
L=msscanf(s,"%i %e")

//----------------------------------------------------------
//--    Formats samples                                   --
//----------------------------------------------------------

msscanf(" 12\n",'%c%c%c%c') //scan characters

msscanf('0xabc','%x') //scan with hexadecimal format

msscanf('012345abczoo','%[0-9abc]%s')  //[] notation

// reading float and double
msscanf('4345.988','%g')-4345.988 // scan as a float
msscanf('4345.988','%lg')-4345.988 // scan as a double

//----------------------------------------------------------
//--    scanning multi-line data files                    --
//----------------------------------------------------------
//create a file with data
u=mopen(TMPDIR+'/foo','w');
t=(0:0.1:%pi)';mfprintf(u,"%6.3f %6.3f\n",t,sin(t))
mclose(u);

u=mopen(TMPDIR+'/foo','r'); // open the file for reading
//read the file line by line
[n,a,b]=mfscanf(u,'%e %e') //first line using multiple LHS syntax
l=mfscanf(u,'%e %e')       //second one using single LHS syntax
//use niter to read 5 more lines
l=mfscanf(5,u,'%e %e')

//use niter=-1 to read up to the end of file
l=mfscanf(-1,u,'%e %e')

mclose(u); //close the file

//----------------------------------------------------------
//--    scanning multi-line  strings vectors              --
//----------------------------------------------------------
//use niter to scan a string vector
[n,Names,Ages]=msscanf(-1,["Alain 19";"Pierre 15";"Tom 12"],'%s %d')
D=msscanf(-1,["Alain 19";"Pierre 15";"Tom 12"],'%s %d')
typeof(D)
Names=D(:,1) //strings
Age=D(:,2)   //numerical values
 ]]></programlisting>
    </refsection>
    <refsection role="see also">
        <title>See also</title>
        <simplelist type="inline">
            <member>
                <link linkend="mclose">mclose</link>
            </member>
            <member>
                <link linkend="meof">meof</link>
            </member>
            <member>
                <link linkend="mfprintf">mfprintf</link>
            </member>
            <member>
                <link linkend="fprintfMat">fprintfMat</link>
            </member>
            <member>
                <link linkend="fscanfMat">fscanfMat</link>
            </member>
            <member>
                <link linkend="mget">mget</link>
            </member>
            <member>
                <link linkend="mgetstr">mgetstr</link>
            </member>
            <member>
                <link linkend="mopen">mopen</link>
            </member>
            <member>
                <link linkend="mprintf">mprintf</link>
            </member>
            <member>
                <link linkend="mput">mput</link>
            </member>
            <member>
                <link linkend="mputstr">mputstr</link>
            </member>
            <member>
                <link linkend="mseek">mseek</link>
            </member>
            <member>
                <link linkend="mtell">mtell</link>
            </member>
            <member>
                <link linkend="mdelete">mdelete</link>
            </member>
            <member>
                <link linkend="scanf_conversion">scanf_conversion</link>
            </member>
        </simplelist>
    </refsection>
</refentry>
