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__stosb

Microsoft Specific

Generates a store string instruction (rep stosb).

void __stosb( 
   unsigned char* Dest, 
   unsigned char Data, 
   size_t Count 
);

[out] Dest

The destination of the operation.

[in] Data

The data to store.

[in] Count

The length of the block of bytes to write.

Intrinsic

Architecture

__stosb

x86, x64

Header file <intrin.h>

The result is that the character Data is written into a block of Count bytes in the Dest string.

This routine is only available as an intrinsic.

// stosb.c
// processor: x86, x64
#include <stdio.h>
#include <intrin.h>

#pragma intrinsic(__stosb)

int main()
{
    unsigned char c = 0x40; /* '@' character */
    unsigned char s[] = "*********************************";

    printf_s("%s\n", s);
    __stosb((unsigned char*)s+1, c, 6);
    printf_s("%s\n", s);
   
}
*********************************
*@@@@@@**************************

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