memset, wmemset Run-Time Library Referenc

 

Run-Time Library Reference

memset, wmemset

See Also

Buffer Manipulation Routines | _memccpy | memchr | memcmp | memcpy | _strnset | Run-Time Routines and .NET Framework Equivalents

Requirements

Routine	Required header	Compatibility
memset	<memory.h> or <string.h>	ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP
wmemset	<wchar.t>	ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

Sets buffers to a specified character.

void *memset(
   void *dest,
   int c,
   size_t count 
);
wchar_t *wmemset(
   wchar_t *dest,
   wchar_t c,
   size_t count
);

Parameters

dest

Pointer to destination.

c

Character to set.

count

Number of characters.

Return Value

The value of dest.

Remarks

Sets the first count chars of dest to the character c.

Security Note   Make sure that the destination buffer is the same size or larger than the source buffer. For more information, see Avoiding Buffer Overruns .

Requirements

Routine	Required header	Compatibility
memset	<memory.h> or <string.h>	ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP
wmemset	<wchar.t>	ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

Example

// crt_memset.c
/* This program uses memset to
 * set the first four chars of buffer to "*".
 */

#include <memory.h>
#include <stdio.h>

int main( void )
{
   char buffer[] = "This is a test of the memset function";

   printf( "Before: %s/n", buffer );
   memset( buffer, '*', 4 );
   printf( "After:  %s/n", buffer );
}

Output

Before: This is a test of the memset function
After:  **** is a test of the memset function

See Also

Buffer Manipulation Routines | _memccpy | memchr | memcmp | memcpy | _strnset | Run-Time Routines and .NET Framework Equivalents

---

Send feedback on this topic to Microsoft

© Microsoft Corporation. All rights reserved.