string.h File Reference

Variants on standard block memory copy/set functions. More...

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

Go to the source code of this file.

Functions
void *	memcpy4 (void *dest, const void *src, size_t count)
	Copy a block of memory, 4 bytes at a time.
void *	memset4 (void *s, unsigned long c, size_t count)
	Set a block of memory, 4 bytes at a time.
void *	memcpy2 (void *dest, const void *src, size_t count)
	Copy a block of memory, 2 bytes at a time.
void *	memset2 (void *s, unsigned short c, size_t count)
	Set a block of memory, 2 bytes at a time.

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Detailed Description

Variants on standard block memory copy/set functions.

This file contains variants on the standard block memory copy/set functions. These variants copy/set memory in the specified block sizes, which may be helpful for interacting with memory-mapped hardware.

Author:

Dan Potter

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Function Documentation

void* memcpy2	(	void *	dest,
		const void *	src,
		size_t	count
	)

Copy a block of memory, 2 bytes at a time.

This function is identical to memcpy(), except it copies 2 bytes at a time.

Parameters:

dest	The destination of the copy.
src	The source to copy.
count	The number of bytes to copy. This should be divisible by 2 (and will be rounded down if not).

Returns:

The original value of dest.

void* memcpy4	(	void *	dest,
		const void *	src,
		size_t	count
	)

Copy a block of memory, 4 bytes at a time.

This function is identical to memcpy(), except it copies 4 bytes at a time.

Parameters:

dest	The destination of the copy.
src	The source to copy.
count	The number of bytes to copy. This should be divisible by 4 (and will be rounded down if not).

Returns:

The original value of dest.

void* memset2	(	void *	s,
		unsigned short	c,
		size_t	count
	)

Set a block of memory, 2 bytes at a time.

This function is identical to memset(), except it sets 2 bytes at a time. This implies that all 16-bits of c are used, not just the first 8 as in memset().

Parameters:

s	The destination of the set.
c	The value to set to.
count	The number of bytes to set. This should be divisible by 2 (and will be rounded down if not).

Returns:

The original value of dest.

void* memset4	(	void *	s,
		unsigned long	c,
		size_t	count
	)

Set a block of memory, 4 bytes at a time.

This function is identical to memset(), except it sets 4 bytes at a time. This implies that all 32-bits of c are used, not just the first 8 as in memset().

Parameters:

s	The destination of the set.
c	The value to set to.
count	The number of bytes to set. This should be divisible by 4 (and will be rounded down if not).

Returns:

The original value of dest.