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2000-03-08  H.J. Lu  <hjl@gnu.org>

	* posix/regex.c (regex_compile): Correctly handle "\{" when
	the RE_INTERVALS is set and the RE_NO_BK_BRACES bit is not set.
This commit is contained in:
Ulrich Drepper 2000-04-21 04:56:35 +00:00
parent d879eb855c
commit 460e040a3f
3 changed files with 46 additions and 12 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2000-03-08 H.J. Lu <hjl@gnu.org>
* posix/regex.c (regex_compile): Correctly handle "\{" when
the RE_INTERVALS is set and the RE_NO_BK_BRACES bit is not set.
2000-04-20 Ulrich Drepper <drepper@redhat.com>
* manual/stdio.texi: Give advise about handling error when using

50
manual/stdio.texi
View File

@ -27,6 +27,7 @@ representing a communications channel to a file, device, or process.
@code{printf} and friends.
* Formatted Input:: @code{scanf} and related functions.
* EOF and Errors:: How you can tell if an I/O error happens.
* Error Recovery:: What you can do about errors.
* Binary Streams:: Some systems distinguish between text files
and binary files.
* File Positioning:: About random-access streams.
@ -3053,16 +3054,6 @@ With the GNU library, @code{EOF} is @code{-1}. In other libraries, its
value may be some other negative number.
@end deftypevr
@comment stdio.h
@comment ISO
@deftypefun void clearerr (FILE *@var{stream})
This function clears the end-of-file and error indicators for the
stream @var{stream}.
The file positioning functions (@pxref{File Positioning}) also clear the
end-of-file indicator for the stream.
@end deftypefun
@comment stdio.h
@comment ISO
@deftypefun int feof (FILE *@var{stream})
@ -3088,6 +3079,45 @@ conditions defined for @code{write} are meaningful for these functions.
For more information about the descriptor-level I/O functions, see
@ref{Low-Level I/O}.
@node Error Recovery
@section Recovering from errors
You may explicitly clear the error and EOF flags with the @code{clearerr}
function.
@comment stdio.h
@comment ISO
@deftypefun void clearerr (FILE *@var{stream})
This function clears the end-of-file and error indicators for the
stream @var{stream}.
The file positioning functions (@pxref{File Positioning}) also clear the
end-of-file indicator for the stream.
@end deftypefun
Note that it is @emph{not} correct to just clear the error flag and retry
a failed stream operation. After a failed write, any number of
characters since the last buffer flush may have been committed to the
file, while some buffered data may have been discarded. Merely retrying
can thus cause lost or repeated data.
A failed read may leave the file pointer in an inappropriate position for
a second try. In both cases, you should seek to a known position before
retrying.
Most errors that can happen are not recoverable --- a second try will
always fail again in the same way. So usually it is best to give up and
report the error to the user, rather than install complicated recovery
logic.
One important exception is @code{EINTR} (@pxref{Interrupted Primitives}).
Many stream I/O implementations will treat it as an ordinary error, which
can be quite inconvenient. You can avoid this hassle by installing all
signals with the @code{SA_RESTART} flag.
For similar reasons, setting nonblocking I/O on a stream's file
descriptor is not usually advisable.
@node Binary Streams
@section Text and Binary Streams

3
posix/regex.c
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@ -2950,8 +2950,7 @@ regex_compile (pattern, size, syntax, bufp)
if (!(syntax & RE_INTERVALS)
/* If we're at `\{' and it's not the open-interval
operator. */
|| ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES))
|| (p - 2 == pattern && p == pend))
|| (syntax & RE_NO_BK_BRACES))
goto normal_backslash;
handle_interval: