#ifdef __cplusplus

extern "C" {

#endif

#ifndef GDHELPERS_H

#define GDHELPERS_H 1

	/* sys/types.h is needed for size_t on Sparc-SunOS-4.1 */

#ifndef _WIN32_WCE

#include <sys/types.h>

#else

#include <stdlib.h>

#endif /* _WIN32_WCE */

	/* TBB: strtok_r is not universal; provide an implementation of it. */

	char * gd_strtok_r (char *s, char *sep, char **state);

	/* These functions wrap memory management. gdFree is

		in gd.h, where callers can utilize it to correctly

		free memory allocated by these functions with the

		right version of free(). */

	void *gdCalloc (size_t nmemb, size_t size);

	void *gdMalloc (size_t size);

	void *gdRealloc (void *ptr, size_t size);

	/* The extended version of gdReallocEx will free *ptr if the

	 * realloc fails */

	void *gdReallocEx (void *ptr, size_t size);

	/* Returns nonzero if multiplying the two quantities will

		result in integer overflow. Also returns nonzero if

		either quantity is negative. By Phil Knirsch based on

		netpbm fixes by Alan Cox. */

	int overflow2(int a, int b);

	/* 2.0.16: portable mutex support for thread safety. */

#if defined(CPP_SHARP)

# define gdMutexDeclare(x)

# define gdMutexSetup(x)

# define gdMutexShutdown(x)

# define gdMutexLock(x)

# define gdMutexUnlock(x)

#elif defined(_WIN32)

	/* 2.0.18: must include windows.h to get CRITICAL_SECTION. */

# include <windows.h>

# define gdMutexDeclare(x) CRITICAL_SECTION x

# define gdMutexSetup(x) InitializeCriticalSection(&x)

# define gdMutexShutdown(x) DeleteCriticalSection(&x)

# define gdMutexLock(x) EnterCriticalSection(&x)

# define gdMutexUnlock(x) LeaveCriticalSection(&x)

#elif defined(HAVE_PTHREAD)

# include <pthread.h>

# define gdMutexDeclare(x) pthread_mutex_t x

# define gdMutexSetup(x) pthread_mutex_init(&x, 0)

# define gdMutexShutdown(x) pthread_mutex_destroy(&x)

# define gdMutexLock(x) pthread_mutex_lock(&x)

# define gdMutexUnlock(x) pthread_mutex_unlock(&x)

#else

# define gdMutexDeclare(x)

# define gdMutexSetup(x)

# define gdMutexShutdown(x)

# define gdMutexLock(x)

# define gdMutexUnlock(x)

#endif /* _WIN32 || HAVE_PTHREAD */

#define DPCM2DPI(dpcm) (unsigned int)((dpcm)*2.54 + 0.5)

#define DPM2DPI(dpm)   (unsigned int)((dpm)*0.0254 + 0.5)

#define DPI2DPCM(dpi)  (unsigned int)((dpi)/2.54 + 0.5)

#define DPI2DPM(dpi)   (unsigned int)((dpi)/0.0254 + 0.5)

#endif /* GDHELPERS_H */

#ifdef __cplusplus

}

#endif