byte is_fastbuf[0]; /* Dummy field for checking of type casts */
byte *bptr, *bstop; /* Access pointers */
byte *buffer, *bufend; /* Start and end of the buffer */
- byte *name; /* File name for error messages */
+ char *name; /* File name for error messages */
sh_off_t pos; /* Position of bstop in the file */
int (*refill)(struct fastbuf *); /* Get a buffer with new data */
void (*spout)(struct fastbuf *); /* Write buffer data to the file */
int can_overwrite_buffer; /* Can the buffer be altered? (see discussion above) 0=never, 1=temporarily, 2=permanently */
};
-/* FastIO on standard files (specify buffer size 0 to enable mmaping) */
-
-struct fastbuf *bfdopen_internal(int fd, uns buflen, byte *name);
-struct fastbuf *bopen(byte *name, uns mode, uns buflen);
-struct fastbuf *bopen_try(byte *name, uns mode, uns buflen);
-struct fastbuf *bopen_tmp(uns buflen);
-struct fastbuf *bfdopen(int fd, uns buflen);
-struct fastbuf *bfdopen_shared(int fd, uns buflen);
-void bfilesync(struct fastbuf *b);
-
-#define TEMP_FILE_NAME_LEN 256
-void temp_file_name(byte *name);
-
-/* 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);
-
-/* FastIO on files opened with O_DIRECT (see fb-direct.c for description) */
-
-extern uns fbdir_cheat;
-
-struct asio_queue;
-struct fastbuf *fbdir_open_fd_internal(int fd, struct asio_queue *io_queue, byte *name);
-struct fastbuf *fbdir_open(byte *name, uns mode, struct asio_queue *io_queue);
-struct fastbuf *fbdir_open_try(byte *name, uns mode, struct asio_queue *io_queue);
-struct fastbuf *fbdir_open_fd(int fd, struct asio_queue *io_queue);
-struct fastbuf *fbdir_open_tmp(struct asio_queue *io_queue);
-
/* FastIO on files with run-time parametrization */
-enum fb_type {
- FB_STD,
- FB_DIRECT,
- FB_MMAP
+enum fb_type { /* Which back-end you want to use */
+ FB_STD, /* Standard buffered I/O */
+ FB_DIRECT, /* Direct I/O bypassing system caches (see fb-direct.c for description) */
+ FB_MMAP /* Memory mapped files */
};
struct fb_params {
enum fb_type type;
uns buffer_size;
+ /* FB_STD only */
+ uns keep_back_buf;
+ /* FB_DIRECT only */
+ uns read_ahead;
+ uns write_back;
struct asio_queue *asio;
};
extern struct cf_section fbpar_cf;
extern struct fb_params fbpar_def;
-struct fastbuf *bopen_file(byte *name, int mode, struct fb_params *params);
-struct fastbuf *bopen_file_try(byte *name, int mode, struct fb_params *params);
+struct fastbuf *bopen_file(const char *name, int mode, struct fb_params *params); /* Use params==NULL for defaults */
+struct fastbuf *bopen_file_try(const char *name, int mode, struct fb_params *params);
struct fastbuf *bopen_tmp_file(struct fb_params *params);
struct fastbuf *bopen_fd(int fd, struct fb_params *params);
+/* FastIO on standard files */
+
+struct fastbuf *bfdopen_internal(int fd, const char *name, uns buflen);
+struct fastbuf *bopen(const char *name, uns mode, uns buflen);
+struct fastbuf *bopen_try(const char *name, uns mode, uns buflen);
+struct fastbuf *bopen_tmp(uns buflen);
+struct fastbuf *bfdopen(int fd, uns buflen);
+struct fastbuf *bfdopen_shared(int fd, uns buflen);
+void bfilesync(struct fastbuf *b);
+
+#define TEMP_FILE_NAME_LEN 256
+void temp_file_name(char *name);
+void bfix_tmp_file(struct fastbuf *fb, const char *name);
+
+/* Internal functions of some file back-ends */
+
+struct fastbuf *bfmmopen_internal(int fd, const char *name, uns mode);
+
+extern uns fbdir_cheat;
+struct asio_queue;
+struct fastbuf *fbdir_open_fd_internal(int fd, const char *name, struct asio_queue *io_queue, uns buffer_size, uns read_ahead, uns write_back);
+
+/* FastIO on in-memory streams */
+
+struct fastbuf *fbmem_create(uns blocksize); /* Create stream and return its writing fastbuf */
+struct fastbuf *fbmem_clone_read(struct fastbuf *); /* Create reading fastbuf */
+
/* FastI on file descriptors with limit */
struct fastbuf *bopen_limited_fd(int fd, uns bufsize, uns limit);
void fbgrow_reset(struct fastbuf *b); /* Reset stream and prepare for writing */
void fbgrow_rewind(struct fastbuf *b); /* Prepare for reading */
+/* FastO on memory pools */
+
+struct mempool;
+struct fbpool {
+ struct fastbuf fb;
+ struct mempool *mp;
+};
+
+void fbpool_init(struct fbpool *fb); /* Initialize a new fastbuf */
+void fbpool_start(struct fbpool *fb, struct mempool *mp, uns init_size);
+ /* Start a new continuous block and prepare for writing (see mp_start()) */
+void *fbpool_end(struct fbpool *fb); /* Close the block and return its address (see mp_end()).
+ The length can be determined with mp_size(mp, ptr). */
+
/* FastO with atomic writes for multi-threaded programs */
struct fb_atomic {
};
#define FB_ATOMIC(f) ((struct fb_atomic *)(f)->is_fastbuf)
-struct fastbuf *fbatomic_open(byte *name, struct fastbuf *master, uns bufsize, int record_len);
+struct fastbuf *fbatomic_open(const char *name, struct fastbuf *master, uns bufsize, int record_len);
void fbatomic_internal_write(struct fastbuf *b);
static inline void
/* Configuring stream parameters */
-int bconfig(struct fastbuf *f, uns type, int data);
+enum bconfig_type {
+ BCONFIG_IS_TEMP_FILE,
+ BCONFIG_KEEP_BACK_BUF,
+};
-#define BCONFIG_IS_TEMP_FILE 0
+int bconfig(struct fastbuf *f, uns type, int data);
/* Universal functions working on all fastbuf's */
return bread_slow(f, b, l, 1);
}
-void bwrite_slow(struct fastbuf *f, void *b, uns l);
-static inline void bwrite(struct fastbuf *f, void *b, uns l)
+void bwrite_slow(struct fastbuf *f, const void *b, uns l);
+static inline void bwrite(struct fastbuf *f, const void *b, uns l)
{
if (bavailw(f) >= l)
{
bwrite_slow(f, b, l);
}
-byte *bgets(struct fastbuf *f, byte *b, uns l); /* Non-std */
-int bgets_nodie(struct fastbuf *f, byte *b, uns l);
-byte *bgets0(struct fastbuf *f, byte *b, uns l);
+/*
+ * Functions for reading of strings:
+ *
+ * bgets() reads a line, strip the trailing '\n' and return a pointer
+ * to the terminating 0 or NULL on EOF. Dies if the line is too long.
+ * bgets0() does the same for 0-terminated strings.
+ * bgets_nodie() a variant of bgets() which returns either the length of the
+ * string (excluding the terminator) or -1 if the line does not fit
+ * in the buffer. In such cases, it returns after reading exactly `l'
+ * bytes of input.
+ * bgets_bb() a variant of bgets() which allocates the string in a growing buffer
+ * bgets_mp() the same, but in a mempool
+ * bgets_stk() the same, but on the stack by alloca()
+ */
+
+char *bgets(struct fastbuf *f, char *b, uns l);
+char *bgets0(struct fastbuf *f, char *b, uns l);
+int bgets_nodie(struct fastbuf *f, char *b, uns l);
struct mempool;
struct bb_t;
uns bgets_bb(struct fastbuf *f, struct bb_t *b, uns limit);
-byte *bgets_mp(struct fastbuf *f, struct mempool *mp);
+char *bgets_mp(struct fastbuf *f, struct mempool *mp);
struct bgets_stk_struct {
struct fastbuf *f;
#define bgets_stk(fb) ({ struct bgets_stk_struct _s; _s.f = (fb); for (bgets_stk_init(&_s); _s.cur_len; _s.cur_buf = alloca(_s.cur_len), bgets_stk_step(&_s)); _s.cur_buf; })
static inline void
-bputs(struct fastbuf *f, byte *b)
+bputs(struct fastbuf *f, const char *b)
{
bwrite(f, b, strlen(b));
}
static inline void
-bputs0(struct fastbuf *f, byte *b)
+bputs0(struct fastbuf *f, const char *b)
{
bwrite(f, b, strlen(b)+1);
}
static inline void
-bputsn(struct fastbuf *f, byte *b)
+bputsn(struct fastbuf *f, const char *b)
{
bputs(f, b);
bputc(f, '\n');
/* Formatted output */
-int bprintf(struct fastbuf *b, char *msg, ...) FORMAT_CHECK(printf,2,3);
-int vbprintf(struct fastbuf *b, char *msg, va_list args);
+int bprintf(struct fastbuf *b, const char *msg, ...) FORMAT_CHECK(printf,2,3);
+int vbprintf(struct fastbuf *b, const char *msg, va_list args);
#endif
projects / libucw.git / blobdiff