diff options
Diffstat (limited to 'manual')
| -rw-r--r-- | manual/stdio.texi | 59 |
1 files changed, 0 insertions, 59 deletions
diff --git a/manual/stdio.texi b/manual/stdio.texi index 94f9126c94..588c15bf7d 100644 --- a/manual/stdio.texi +++ b/manual/stdio.texi @@ -4780,7 +4780,6 @@ provide equivalent functionality. @menu * String Streams:: Streams that get data from or put data in a string or memory buffer. -* Obstack Streams:: Streams that store data in an obstack. * Custom Streams:: Defining your own streams with an arbitrary input data source and/or output data sink. @end menu @@ -4884,64 +4883,6 @@ buf = `hello', size = 5 buf = `hello, world', size = 12 @end smallexample -@c @group Invalid outside @example. -@node Obstack Streams -@subsection Obstack Streams - -You can open an output stream that puts it data in an obstack. -@xref{Obstacks}. - -@comment stdio.h -@comment GNU -@deftypefun {FILE *} open_obstack_stream (struct obstack *@var{obstack}) -This function opens a stream for writing data into the obstack @var{obstack}. -This starts an object in the obstack and makes it grow as data is -written (@pxref{Growing Objects}). -@c @end group Doubly invalid because not nested right. - -Calling @code{fflush} on this stream updates the current size of the -object to match the amount of data that has been written. After a call -to @code{fflush}, you can examine the object temporarily. - -You can move the file position of an obstack stream with @code{fseek} or -@code{fseeko} (@pxref{File Positioning}). Moving the file position past -the end of the data written fills the intervening space with zeros. - -To make the object permanent, update the obstack with @code{fflush}, and -then use @code{obstack_finish} to finalize the object and get its address. -The following write to the stream starts a new object in the obstack, -and later writes add to that object until you do another @code{fflush} -and @code{obstack_finish}. - -But how do you find out how long the object is? You can get the length -in bytes by calling @code{obstack_object_size} (@pxref{Status of an -Obstack}), or you can null-terminate the object like this: - -@smallexample -obstack_1grow (@var{obstack}, 0); -@end smallexample - -Whichever one you do, you must do it @emph{before} calling -@code{obstack_finish}. (You can do both if you wish.) -@end deftypefun - -Here is a sample function that uses @code{open_obstack_stream}: - -@smallexample -char * -make_message_string (const char *a, int b) -@{ - FILE *stream = open_obstack_stream (&message_obstack); - output_task (stream); - fprintf (stream, ": "); - fprintf (stream, a, b); - fprintf (stream, "\n"); - fclose (stream); - obstack_1grow (&message_obstack, 0); - return obstack_finish (&message_obstack); -@} -@end smallexample - @node Custom Streams @subsection Programming Your Own Custom Streams @cindex custom streams |