Add an ERRORS section documenting at least some of the errors

that may occur for scanf().
See also http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=487254.

man3/scanf.3

@@ -43,13 +43,15 @@
 .\"	incorporated from the GNU C library documentation ((C) The
 .\"	Free Software Foundation); other parts substantially rewritten.
 .\"
+.\" 2008-06-22 Add ERRORS section.
+.\"
 .\" FIXME
 .\" The glibc 2.7 release announcement says:
 .\"     Implement 'm' modifier for scanf.  Add stricter C99/SUS compliance
 .\"     by not recognizing 'a' as a modifier when those specs are requested.
 .\" These changes need to be documented.
 .\"
-.TH SCANF 3  2007-07-26 "GNU" "Linux Programmer's Manual"
+.TH SCANF 3  2008-06-22 "GNU" "Linux Programmer's Manual"
 .SH NAME
 scanf, fscanf, sscanf, vscanf, vsscanf, vfscanf \- input format conversion
 .SH SYNOPSIS
@@ -541,13 +543,44 @@ in which case the error indicator for the stream (see
 is set, and
 .I errno
 is set indicate the error.
+.SH ERRORS
+.B EAGAIN
+The file descriptor underlying
+.I stream
+is marked non-blocking, and the read operation would block.
+.TP
+.B EBADF
+The file descriptor underlying
+.I stream
+is invalid, or not open for reading.
+.TP
+.B EILSEQ
+Input byte sequence does not form a valid character.
+.TP
+.B EINTR
+The read operation was interrupted by a signal.
+.TP
+.B EINVAL
+Not enough arguments; or
+.I format
+is NULL.
+.TP
+.B ENOMEM
+Out of memory.
+.TP
+.B ERANGE
+The result of an integer conversion would exceed the size
+that can be stored in the corresponding integer type.
 .SH "CONFORMING TO"
 The functions
 .BR fscanf (),
 .BR scanf (),
 and
 .BR sscanf ()
-conform to C89 and C99.
+conform to C89 and C99 and POSX.1-2001.
+These standard do not specify the
+.B ERANGE
+error.
 .PP
 The
 .B q