qio man page on 4.4BSD

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QIO(3)									QIO(3)

NAME
       qio - quick I/O part of InterNetNews library

SYNOPSIS
       #include "qio.h"

       QIOSTATE *
       QIOopen(name, size)
	   char		    *name;
	   int		    size;

       QIOSTATE *
       QIOfdopen(fd, size)
	   int		    fd;
	   int		    size;

       void
       QIOclose(qp)
	   QIOSTATE	    *qp;

       char *
       QIOread(qp)
	   QIOSTATE	    *qp;

       int
       QIOlength(qp)
	   QIOSTATE	    *qp;

       int
       QIOtoolong(qp)
	   QIOSTATE	    *qp;

       int
       QIOerror(qp)
	   QIOSTATE	    *qp;

       int
       QIOtell(qp)
	   QIOSTATE	    *qp;

       int
       QIOrewind(qp)
	   QIOSTATE	    *qp;

       int
       QIOfileno(qp)
	   QIOSTATE	    *qp;

DESCRIPTION
       The routines described in this manual page are part of the InterNetNews
       library, libinn(3).  They are used to  provide  quick  read  access  to
       files.  The letters ``QIO'' stand for Quick I/O.

       QIOopen	opens  the  file  name	for reading.  It uses a buffer of size
       bytes, which must also be larger then the longest expected  line.   The
       header  file  defines  the constant QIO_BUFFER as a reasonable default.
       If size is zero, then QIOopen will call stat(2) and  use	 the  returned
       block  size;  if that fails it will use QIO_BUFFER.  It returns NULL on
       error, or a pointer to a handle to be used in other  calls.   QIOfdopen
       performs	 the  same  function  except that fd refers to an already-open
       descriptor.

       QIOclose closes the open file and releases any resources used by it.

       QIOread returns a pointer to the next line in the file.	 The  trailing
       newline	will  be  replaced  with  a  \0.   If EOF is reached, an error
       occurs, or if the line is longer than the buffer, QIOread returns NULL.

       After a successful call to QIOread, QIOlength will return the length of
       the current line.

       The  functions  QIOtoolong  and	QIOerror  can  be called after QIOread
       returns NULL to determine if there was an error, or if the line was too
       long.   If  QIOtoolong  returns non-zero, then the current line did not
       fit in the buffer, and the next call to QIOread will try read the  rest
       of  the	line.	Long lines can only be discarded.  If QIOerror returns
       non-zero, then a serious I/O error occurred.

       QIOtell returns the lseek(2) offset at which the next line will start.

       QIOrewind sets the read pointer back to the beginning of the file.

       QIOfileno returns the descriptor of the open file.

       QIOlength, QIOtoolong, QIOerror, QIOtell, and QIOfileno are implemented
       as macro's defined in the header file.

EXAMPLE
	      QIOSTATE		   *h;
	      long		   offset;
	      char		   *p;

	      h = QIOopen("/etc/motd", QIO_BUFFER);
	      for (offset = QIOtell(h); (p = QIOread(h)) != NULL; offset = QIOtell(h))
		  printf("At %ld, %s\n", offset, p);
	      if (QIOerror(h)) {
		  perror("Read error");
		  exit(1);
	      }
	      QIOclose(h);

HISTORY
       Written	by  Rich  $alz <rsalz@uunet.uu.net> for InterNetNews.  This is
       revision 1.7, dated 1993/01/29.

									QIO(3)
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