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<H1> A.10.2 Text File Management</H1>
<H4 ALIGN=CENTER>Static Semantics</H4>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.4em"> The only allowed
file modes for text files are the modes In_File, Out_File, and Append_File.
The subprograms given in subclause <A HREF="RM-A-8-2.html">A.8.2</A>
for the control of external files, and the function End_Of_File given
in subclause <A HREF="RM-A-8-3.html">A.8.3</A> for sequential input-output,
are also available for text files. There is also a version of End_Of_File
that refers to the current default input file. For text files, the procedures
have the following additional effects: </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>For the procedures Create and Open: After a file with mode
Out_File or Append_File is opened, the page length and line length are
unbounded (both have the conventional value zero). After a file (of any
mode) is opened, the current column, current line, and current page
numbers are set to one. If the mode is Append_File, it is implementation
defined whether a page terminator will separate preexisting text in the
file from the new text to be written. </LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>For the procedure Close: If the file has the current mode
Out_File or Append_File, has the effect of calling New_Page, unless the
current page is already terminated; then outputs a file terminator.</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>4</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>For the procedure Reset: If the file has the current mode
Out_File or Append_File, has the effect of calling New_Page, unless the
current page is already terminated; then outputs a file terminator. The
current column, line, and page numbers are set to one, and the line and
page lengths to Unbounded. If the new mode is Append_File, it is implementation
defined whether a page terminator will separate preexisting text in the
file from the new text to be written. </LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>5</FONT></DIV>
<DIV Class="Normal"> The exception Mode_Error is propagated by the
procedure Reset upon an attempt to change the mode of a file that is
the current default input file, the current default output file, or the
current default error file. </DIV>
<DIV Class="NotesHeader"><FONT SIZE=-1>NOTES</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>6</FONT></DIV>
<DIV Class="Notes" Style="margin-bottom: 0.4em"><FONT SIZE=-1>22 An
implementation can define the Form parameter of Create and Open to control
effects including the following: </FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>7</FONT></DIV>
<UL Class="NotesBulleted"><FONT SIZE=-1><LI TYPE=DISC>the interpretation of line and column numbers for an interactive
file, and</LI></FONT></UL>
<DIV Class="Paranum"><FONT SIZE=-2>8</FONT></DIV>
<UL Class="NotesBulleted"><FONT SIZE=-1><LI TYPE=DISC>the interpretation of text formats in a file created by
a foreign program. </LI></FONT></UL>
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