lua51 0.1.6

Lua 5.1.5 bindings for Rust.
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/*
** $Id: lzio.h,v 1.21.1.1 2007/12/27 13:02:25 roberto Exp $
** Buffered streams
** See Copyright Notice in lua.h
*/


#ifndef lzio_h
#define lzio_h


#include "lua.h"

#include "lmem.h"


#define EOZ    (-1)            /* end of stream */


typedef struct Zio ZIO;

#define char2int(c)    cast(int, cast(unsigned char, (c)))


#define zgetc(z)  (((z)->n--)>0 ?  char2int(*(z)->p++) : luaZ_fill(z))


typedef struct Mbuffer {
    char *buffer;
    size_t n;
    size_t buffsize;
} Mbuffer;

#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)


#define luaZ_buffer(buff)    ((buff)->buffer)

#define luaZ_sizebuffer(buff)    ((buff)->buffsize)

#define luaZ_bufflen(buff)    ((buff)->n)


#define luaZ_resetbuffer(buff) ((buff)->n = 0)



#define luaZ_resizebuffer(L, buff, size) \

    (luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
    (buff)->buffsize = size)

#define luaZ_freebuffer(L, buff)    luaZ_resizebuffer(L, buff, 0)



LUAI_FUNC char *luaZ_openspace(lua_State *L, Mbuffer *buff, size_t n);

LUAI_FUNC void luaZ_init(lua_State *L, ZIO *z, lua_Reader reader,
                         void *data);

LUAI_FUNC size_t luaZ_read(ZIO *z, void *b, size_t n);    /* read next n bytes */
LUAI_FUNC int luaZ_lookahead(ZIO *z);


/* --------- Private Part ------------------ */

struct Zio {
    size_t n;            /* bytes still unread */
    const char *p;        /* current position in buffer */
    lua_Reader reader;
    void *data;            /* additional data */
    lua_State *L;            /* Lua state (for reader) */
};


LUAI_FUNC int luaZ_fill(ZIO *z);

#endif