/*

** The OpenGL Extension Wrangler Library

** Copyright (C) 2002-2008, Milan Ikits <milan ikits[]ieee="" org=""></milan>

** Copyright (C) 2002-2008, Marcelo E. Magallon <mmagallo[]debian org=""></mmagallo[]debian>

** Copyright (C) 2002, Lev Povalahev

** All rights reserved.

** 

** Redistribution and use in source and binary forms, with or without 

** modification, are permitted provided that the following conditions are met:

** 

** * Redistributions of source code must retain the above copyright notice, 

**   this list of conditions and the following disclaimer.

** * Redistributions in binary form must reproduce the above copyright notice, 

**   this list of conditions and the following disclaimer in the documentation 

**   and/or other materials provided with the distribution.

** * The name of the author may be used to endorse or promote products 

**   derived from this software without specific prior written permission.

**

** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 

** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 

** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 

** LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 

** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 

** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

** INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

** CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

** ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

** THE POSSIBILITY OF SUCH DAMAGE.

*/

#include <gl glew.h=""></gl>

#if defined(_WIN32)

#  include <gl wglew.h=""></gl>

#elif !defined(__ANDROID__) && (!defined(__APPLE__) || defined(GLEW_APPLE_GLX))

#  include <gl glxew.h=""></gl>

#endif

#include "glew_utils.h"

#if defined(__APPLE__)

#include <mach-o dyld.h=""></mach-o>

#include <stdlib.h></stdlib.h>

#include <string.h></string.h>

void* NSGLGetProcAddress (const GLubyte *name)

{

  NSSymbol symbol;

  char* symbolName;

  /* prepend a '_' for the Unix C symbol mangling convention */

  symbolName = malloc(strlen((const char*)name) + 2);

  strcpy(symbolName+1, (const char*)name);

  symbolName[0] = '_';

  symbol = NULL;

  if (NSIsSymbolNameDefined(symbolName))

    symbol = NSLookupAndBindSymbol(symbolName);

  free(symbolName);

  return symbol ? NSAddressOfSymbol(symbol) : NULL;

}

#endif /* __APPLE__ */

#if defined(__sgi) || defined (__sun)

#include <dlfcn.h></dlfcn.h>

#include <stdio.h></stdio.h>

#include <stdlib.h></stdlib.h>

void* dlGetProcAddress (const GLubyte* name)

{

  static void* h = NULL;

  static void* gpa;

  if (h == NULL)

  {

    if ((h = dlopen(NULL, RTLD_LAZY | RTLD_LOCAL)) == NULL) return NULL;

    gpa = dlsym(h, "glXGetProcAddress");

  }

  if (gpa != NULL)

    return ((void*(*)(const GLubyte*))gpa)(name);

  else

    return dlsym(h, (const char*)name);

}

#endif /* __sgi || __sun */

/*

 * GLEW, just like OpenGL or GLU, does not rely on the standard C library.

 * These functions implement the functionality required in this file.

 */

GLuint _glewStrLen (const GLubyte* s)

{

  GLuint i=0;

  while (s+i != NULL && s[i] != '\0') i++;

  return i;

}

GLuint _glewStrCLen (const GLubyte* s, GLubyte c)

{

  GLuint i=0;

  while (s+i != NULL && s[i] != '\0' && s[i] != c) i++;

  return i;

}

GLboolean _glewStrSame (const GLubyte* a, const GLubyte* b, GLuint n)

{

  GLuint i=0;

  while (i < n && a+i != NULL && b+i != NULL && a[i] == b[i]) i++;

  return i == n ? GL_TRUE : GL_FALSE;

}

GLboolean _glewStrSame1 (GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)

{

  while (*na > 0 && (**a == ' ' || **a == '\n' || **a == '\r' || **a == '\t'))

  {

    *a++;

    *na--;

  }

  if(*na >= nb)

  {

    GLuint i=0;

    while (i < nb && *a+i != NULL && b+i != NULL && *a[i] == b[i]) i++;

	if(i == nb)

	{

		*a = *a + nb;

		*na = *na - nb;

		return GL_TRUE;

	}

  }

  return GL_FALSE;

}

GLboolean _glewStrSame2 (GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)

{

  if(*na >= nb)

  {

    GLuint i=0;

    while (i < nb && *a+i != NULL && b+i != NULL && *a[i] == b[i]) i++;

	if(i == nb)

	{

		*a = *a + nb;

		*na = *na - nb;

		return GL_TRUE;

	}

  }

  return GL_FALSE;

}

GLboolean _glewStrSame3 (GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)

{

  if(*na >= nb)

  {

    GLuint i=0;

    while (i < nb && *a+i != NULL && b+i != NULL && *a[i] == b[i]) i++;

    if (i == nb && (*na == nb || *a[i] == ' ' || *a[i] == '\n' || *a[i] == '\r' || *a[i] == '\t'))

    {

      *a = *a + nb;

      *na = *na - nb;

      return GL_TRUE;

    }

  }

  return GL_FALSE;

}