WT_LINK added into WORD_TYPES_META

[libucw.git] / lib / fastbuf.h

diff --git a/lib/fastbuf.h b/lib/fastbuf.h
index 4f6c5e66f8ab8fa3e386f0d6a796d0ba67e80c35..a370c45be8995155190b5eb61079812a685178e4 100644 (file)
--- a/lib/fastbuf.h
+++ b/lib/fastbuf.h
@@ -15,6 +15,7 @@
 #endif
 
 #include <string.h>
+#include <stdarg.h>
 
 #include "lib/unaligned.h"
 
@@ -36,11 +37,11 @@
  *
  *  When writing:
  *
- *  +----------------+---------------------------+
- *  | written data   | free space                |
- *  +----------------+---------------------------+
- *  ^                 ^                           ^
- *  buffer=bstop      bptr                        bufend
+ *  +--------+--------------+--------------------+
+ *  | unused | written data | free space         |
+ *  +--------+--------------+--------------------+
+ *  ^         ^              ^                    ^
+ *  buffer    bstop          bptr                 bufend
  *
  *  Dirty tricks:
  *
@@ -62,28 +63,31 @@ struct fastbuf {
   void (*spout)(struct fastbuf *);     /* Write buffer data to the file */
   void (*seek)(struct fastbuf *, sh_off_t, int);  /* Slow path for bseek(), buffer already flushed */
   void (*close)(struct fastbuf *);     /* Close the stream */
+  int (*config)(struct fastbuf *, uns, int);   /* Configure the stream */
 };
 
-/* FastIO on standard files */
-
-struct fb_file {
-  struct fastbuf fb;
-  int fd;                              /* File descriptor, -1 if not a real file */
-  int is_temp_file;                    /* 0=normal file, 1=temporary file, delete on close, -1=shared FD */
-};
-#define FB_FILE(f) ((struct fb_file *)(f)->is_fastbuf)
+/* FastIO on standard files (specify buffer size 0 to enable mmaping) */
 
 struct fastbuf *bopen(byte *name, uns mode, uns buffer);
 struct fastbuf *bopen_tmp(uns buffer);
 struct fastbuf *bfdopen(int fd, uns buffer);
 struct fastbuf *bfdopen_shared(int fd, uns buffer);
-#define FB_IS_TEMP_FILE(f) FB_FILE(f)->is_temp_file
 
 /* FastIO on in-memory streams */
 
 struct fastbuf *fbmem_create(unsigned blocksize);      /* Create stream and return its writing fastbuf */
 struct fastbuf *fbmem_clone_read(struct fastbuf *);    /* Create reading fastbuf */
 
+/* FastIO on memory mapped files */
+
+struct fastbuf *bopen_mm(byte *name, uns mode);
+
+/* Configuring stream parameters */
+
+int bconfig(struct fastbuf *f, uns type, int data);
+
+#define BCONFIG_IS_TEMP_FILE 0
+
 /* Universal functions working on all fastbuf's */
 
 void bclose(struct fastbuf *f);
@@ -312,11 +316,11 @@ bbcopy(struct fastbuf *f, struct fastbuf *t, uns l)
 
 /* Direct I/O on buffers */
 
-static inline int
+static inline uns
 bdirect_read_prepare(struct fastbuf *f, byte **buf)
 {
   if (f->bptr == f->bstop && !f->refill(f))
-    return EOF;
+    return 0;
   *buf = f->bptr;
   return f->bstop - f->bptr;
 }
@@ -327,7 +331,7 @@ bdirect_read_commit(struct fastbuf *f, byte *pos)
   f->bptr = pos;
 }
 
-static inline int
+static inline uns
 bdirect_write_prepare(struct fastbuf *f, byte **buf)
 {
   if (f->bptr == f->bufend)
@@ -342,4 +346,9 @@ bdirect_write_commit(struct fastbuf *f, byte *pos)
   f->bptr = pos;
 }
 
+/* Formatted output */
+
+int bprintf(struct fastbuf *b, byte *msg, ...);
+int vbprintf(struct fastbuf *b, byte *msg, va_list args);
+
 #endif