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Member "memcached-1.6.15/vendor/lua/src/lzio.c" (1 Oct 2021, 1322 Bytes) of package /linux/www/memcached-1.6.15.tar.gz:


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    1 /*
    2 ** $Id: lzio.c $
    3 ** Buffered streams
    4 ** See Copyright Notice in lua.h
    5 */
    6 
    7 #define lzio_c
    8 #define LUA_CORE
    9 
   10 #include "lprefix.h"
   11 
   12 
   13 #include <string.h>
   14 
   15 #include "lua.h"
   16 
   17 #include "llimits.h"
   18 #include "lmem.h"
   19 #include "lstate.h"
   20 #include "lzio.h"
   21 
   22 
   23 int luaZ_fill (ZIO *z) {
   24   size_t size;
   25   lua_State *L = z->L;
   26   const char *buff;
   27   lua_unlock(L);
   28   buff = z->reader(L, z->data, &size);
   29   lua_lock(L);
   30   if (buff == NULL || size == 0)
   31     return EOZ;
   32   z->n = size - 1;  /* discount char being returned */
   33   z->p = buff;
   34   return cast_uchar(*(z->p++));
   35 }
   36 
   37 
   38 void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) {
   39   z->L = L;
   40   z->reader = reader;
   41   z->data = data;
   42   z->n = 0;
   43   z->p = NULL;
   44 }
   45 
   46 
   47 /* --------------------------------------------------------------- read --- */
   48 size_t luaZ_read (ZIO *z, void *b, size_t n) {
   49   while (n) {
   50     size_t m;
   51     if (z->n == 0) {  /* no bytes in buffer? */
   52       if (luaZ_fill(z) == EOZ)  /* try to read more */
   53         return n;  /* no more input; return number of missing bytes */
   54       else {
   55         z->n++;  /* luaZ_fill consumed first byte; put it back */
   56         z->p--;
   57       }
   58     }
   59     m = (n <= z->n) ? n : z->n;  /* min. between n and z->n */
   60     memcpy(b, z->p, m);
   61     z->n -= m;
   62     z->p += m;
   63     b = (char *)b + m;
   64     n -= m;
   65   }
   66   return 0;
   67 }
   68