X-Git-Url: http://mj.ucw.cz/gitweb/?a=blobdiff_plain;ds=sidebyside;f=ucw%2Ffastbuf.h;h=99a9dd47285f04f5adb0c458370ced1c359a2dff;hb=4e2835850dfa4d869e470017d921f4d36293b111;hp=9b0f72510fcc793e571a4da995fafd0348ec3702;hpb=0b7df598070533b746e6162e53f90af764bd8f83;p=libucw.git

diff --git a/ucw/fastbuf.h b/ucw/fastbuf.h
index 9b0f7251..99a9dd47 100644
--- a/ucw/fastbuf.h
+++ b/ucw/fastbuf.h
@@ -3,6 +3,7 @@
  *
  *	(c) 1997--2011 Martin Mares <mj@ucw.cz>
  *	(c) 2004 Robert Spalek <robert@ucw.cz>
+ *	(c) 2014 Pavel Charvat <pchar@ucw.cz>
  *
  *	This software may be freely distributed and used according to the terms
  *	of the GNU Lesser General Public License.
@@ -73,6 +74,9 @@
 #define fbmulti_append ucw_fbmulti_append
 #define fbmulti_create ucw_fbmulti_create
 #define fbmulti_remove ucw_fbmulti_remove
+#define fbnull_open ucw_fbnull_open
+#define fbnull_start ucw_fbnull_start
+#define fbnull_test ucw_fbnull_test
 #define fbpar_cf ucw_fbpar_cf
 #define fbpar_def ucw_fbpar_def
 #define fbpool_end ucw_fbpool_end
@@ -107,7 +111,7 @@
  *    ^              ^                     ^                           ^
  *    buffer      <= bstop (BE pos)     <= bptr (FE pos)            <= bufend
  *
- *   * This schema describes a fastbuf after its initialization or bflush().
+ *   * This schema describes a fastbuf after its initialization or @bflush().
  *   * There is no cached data and we are ready for any read or write operation
  *     (well, only if the back-end supports it).
  *   * The interval `[bptr, bufend]` can be used by front-ends
@@ -266,7 +270,7 @@ extern struct fb_params fbpar_def;	/** The default `fb_params` **/
  * Raises `ucw.fb.open` if the file does not exist.
  **/
 struct fastbuf *bopen_file(const char *name, int mode, struct fb_params *params);
-struct fastbuf *bopen_file_try(const char *name, int mode, struct fb_params *params); /** Like bopen_file(), but returns NULL on failure. **/
+struct fastbuf *bopen_file_try(const char *name, int mode, struct fb_params *params); /** Like @bopen_file(), but returns NULL on failure. **/
 
 /**
  * Opens a temporary file.
@@ -470,7 +474,7 @@ struct fbpool { /** Structure for fastbufs & mempools. **/
 
 /**
  * Initialize a new `fbpool`. The structure is allocated by the caller,
- * so bclose() should not be called and no resource tying takes place.
+ * so @bclose() should not be called and no resource tying takes place.
  **/
 void fbpool_init(struct fbpool *fb);	/** Initialize a new mempool fastbuf. **/
 /**
@@ -542,6 +546,25 @@ static inline void fbatomic_commit(struct fastbuf *b)
     fbatomic_internal_write(b);
 }
 
+/*** === Null fastbufs ***/
+
+/**
+ * Creates a new "/dev/null"-like  fastbuf.
+ * Any read attempt returns an EOF, any write attempt is silently ignored.
+ **/
+struct fastbuf *fbnull_open(uns bufsize);
+
+/**
+ * Can be used by any back-end to switch it to the null mode.
+ * You need to provide at least one byte long buffer for writing.
+ **/
+void fbnull_start(struct fastbuf *b, byte *buf, uns bufsize);
+
+/**
+ * Checks whether a fastbuf has been switched to the null mode.
+ **/
+bool fbnull_test(struct fastbuf *b);
+
 /***
  * === Fastbufs atop other fastbufs [[fbmulti]]
  *