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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/400.mu</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.LineNr { }
+.PreProc { color: #c000c0; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/master/baremetal/400.mu'>https://github.com/akkartik/mu/blob/master/baremetal/400.mu</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr">1 </span><span class="PreProc">sig</span> <a href='101screen.subx.html#L3'>pixel</a> screen: (addr screen), x: int, y: int, color: int
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2025-04-21 22:00:34 +0000
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/*
** $Id: lmem.c,v 1.70.1.1 2007/12/27 13:02:25 roberto Exp $
** Interface to Memory Manager
** See Copyright Notice in lua.h
*/


#include <stddef.h>

#define lmem_c
#define LUA_CORE

#include "lua.h"

#include "ldebug.h"
#include "ldo.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"



/*
** About the realloc function:
** void * frealloc (void *ud, void *ptr, size_t osize, size_t nsize);
** (`osize' is the old size, `nsize' is the new size)
**
** Lua ensures that (ptr == NULL) iff (osize == 0).
**
** * frealloc(ud, NULL, 0, x) creates a new block of size `x'
**
** * frealloc(ud, p, x, 0) frees the block `p'
** (in this specific case, frealloc must return NULL).
** particularly, frealloc(ud, NULL, 0, 0) does nothing
** (which is equivalent to free(NULL) in ANSI C)
**
** frealloc returns NULL if it cannot create or reallocate the area
** (any reallocation to an equal or smaller size cannot fail!)
*/



#define MINSIZEARRAY	4


void *luaM_growaux_ (lua_State *L, void *block, int *size, size_t size_elems,
                     int limit, const char *errormsg) {
  void *newblock;
  int newsize;
  if (*size >= limit/2) {  /* cannot double it? */
    if (*size >= limit)  /* cannot grow even a little? */
      luaG_runerror(L, errormsg);
    newsize = limit;  /* still have at least one free place */
  }
  else {
    newsize = (*size)*2;
    if (newsize < MINSIZEARRAY)
      newsize = MINSIZEARRAY;  /* minimum size */
  }
  newblock = luaM_reallocv(L, block, *size, newsize, size_elems);
  *size = newsize;  /* update only when everything else is OK */
  return newblock;
}


void *luaM_toobig (lua_State *L) {
  luaG_runerror(L, "memory allocation error: block too big");
  return NULL;  /* to avoid warnings */
}



/*
** generic allocation routine.
*/
void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {
  global_State *g = G(L);
  lua_assert((osize == 0) == (block == NULL));
  block = (*g->frealloc)(g->ud, block, osize, nsize);
  if (block == NULL && nsize > 0)
    luaD_throw(L, LUA_ERRMEM);
  lua_assert((nsize == 0) == (block == NULL));
  g->totalbytes = (g->totalbytes - osize) + nsize;
  return block;
}