/*
 * Mesa 3-D graphics library
 *
 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */


/**
 * \file imports.h
 * Standard C library function wrappers.
 *
 * This file provides wrappers for all the standard C library functions
 * like malloc(), free(), printf(), getenv(), etc.
 */


#ifndef IMPORTS_H
#define IMPORTS_H


#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include "util/compiler.h"
#include "util/bitscan.h"
#include "util/u_memory.h"

#ifdef __cplusplus
extern "C" {
#endif


/*
 * For GL_ARB_vertex_buffer_object we need to treat vertex array pointers
 * as offsets into buffer stores.  Since the vertex array pointer and
 * buffer store pointer are both pointers and we need to add them, we use
 * this macro.
 * Both pointers/offsets are expressed in bytes.
 */
#define ADD_POINTERS(A, B)  ( (uint8_t *) (A) + (uintptr_t) (B) )


/**
 * Sometimes we treat floats as ints.  On x86 systems, moving a float
 * as an int (thereby using integer registers instead of FP registers) is
 * a performance win.  Typically, this can be done with ordinary casts.
 * But with gcc's -fstrict-aliasing flag (which defaults to on in gcc 3.0)
 * these casts generate warnings.
 * The following union typedef is used to solve that.
 */
typedef union { float f; int i; unsigned u; } fi_type;



/*@}*/


/**
 * finite macro.
 */
#if defined(_MSC_VER)
#  define finite _finite
#endif


/***
 *** IS_INF_OR_NAN: test if float is infinite or NaN
 ***/
#if defined(isfinite)
#define IS_INF_OR_NAN(x)        (!isfinite(x))
#elif defined(finite)
#define IS_INF_OR_NAN(x)        (!finite(x))
#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#define IS_INF_OR_NAN(x)        (!isfinite(x))
#else
#define IS_INF_OR_NAN(x)        (!finite(x))
#endif


/**
 * Convert float to int by rounding to nearest integer, away from zero.
 */
static inline int IROUND(float f)
{
   return (int) ((f >= 0.0F) ? (f + 0.5F) : (f - 0.5F));
}

/**
 * Convert float to int64 by rounding to nearest integer.
 */
static inline int64_t IROUND64(float f)
{
   return (int64_t) ((f >= 0.0F) ? (f + 0.5F) : (f - 0.5F));
}


/**********************************************************************
 * Functions
 */

extern void *
_mesa_align_malloc( size_t bytes, unsigned long alignment );

extern void *
_mesa_align_calloc( size_t bytes, unsigned long alignment );

extern void
_mesa_align_free( void *ptr );

extern void *
_mesa_align_realloc(void *oldBuffer, size_t oldSize, size_t newSize,
                    unsigned long alignment);

extern int
_mesa_snprintf( char *str, size_t size, const char *fmt, ... ) PRINTFLIKE(3, 4);

extern int
_mesa_vsnprintf(char *str, size_t size, const char *fmt, va_list arg);


#if defined(_WIN32) && !defined(HAVE_STRTOK_R)
#define strtok_r strtok_s
#endif

#ifdef __cplusplus
}
#endif


#endif /* IMPORTS_H */