?login_element?

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  1. /*
  2. ** $Id: lzio.c,v 1.31.1.1 2007/12/27 13:02:25 roberto Exp $
  3. ** a generic input stream interface
  4. ** See Copyright Notice in lua.h
  5. */
  6.  
  7.  
  8. #include <string.h>
  9.  
  10. #define lzio_c
  11. #define LUA_CORE
  12.  
  13. #include "lua.h"
  14.  
  15. #include "llimits.h"
  16. #include "lmem.h"
  17. #include "lstate.h"
  18. #include "lzio.h"
  19.  
  20.  
  21. int luaZ_fill (ZIO *z) {
  22.   size_t size;
  23.   lua_State *L = z->L;
  24.   const char *buff;
  25.   lua_unlock(L);
  26.   buff = z->reader(L, z->data, &size);
  27.   lua_lock(L);
  28.   if (buff == NULL || size == 0) return EOZ;
  29.   z->n = size - 1;
  30.   z->p = buff;
  31.   return char2int(*(z->p++));
  32. }
  33.  
  34.  
  35. int luaZ_lookahead (ZIO *z) {
  36.   if (z->n == 0) {
  37.     if (luaZ_fill(z) == EOZ)
  38.       return EOZ;
  39.     else {
  40.       z->n++;  /* luaZ_fill removed first byte; put back it */
  41.       z->p--;
  42.     }
  43.   }
  44.   return char2int(*z->p);
  45. }
  46.  
  47.  
  48. void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) {
  49.   z->L = L;
  50.   z->reader = reader;
  51.   z->data = data;
  52.   z->n = 0;
  53.   z->p = NULL;
  54. }
  55.  
  56.  
  57. /* --------------------------------------------------------------- read --- */
  58. size_t luaZ_read (ZIO *z, void *b, size_t n) {
  59.   while (n) {
  60.     size_t m;
  61.     if (luaZ_lookahead(z) == EOZ)
  62.       return n;  /* return number of missing bytes */
  63.     m = (n <= z->n) ? n : z->n;  /* min. between n and z->n */
  64.     memcpy(b, z->p, m);
  65.     z->n -= m;
  66.     z->p += m;
  67.     b = (char *)b + m;
  68.     n -= m;
  69.   }
  70.   return 0;
  71. }
  72.  
  73. /* ------------------------------------------------------------------------ */
  74. char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) {
  75.   if (n > buff->buffsize) {
  76.     if (n < LUA_MINBUFFER) n = LUA_MINBUFFER;
  77.     luaZ_resizebuffer(L, buff, n);
  78.   }
  79.   return buff->buffer;
  80. }
  81.  
  82.  
  83.