memset()
QNX SDP8.0C Library ReferenceAPIDeveloper
Set memory to a given value
Synopsis:
#include <string.h>
void* memset( void* dst,
int c,
size_t length );
Arguments:
- dst
- A pointer to the memory that you want to set.
- c
- The value that you want to store in each byte.
- length
- The number of bytes to set.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The memset() function fills length bytes starting at dst with the value c.
Note:
The compiler might optimize out calls to memset() if it appears that the
memory isn't used again in the calling function.
For a secure routine that forces the memory to be set, call
memset_s().
Returns:
A pointer to the destination buffer (that is, the value of dst).
Examples:
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
int main( void )
{
char buffer[80];
memset( buffer, '=', 80 );
buffer[79] = '\0';
puts( buffer );
return EXIT_SUCCESS;
}
Environment variables:
- LIBC_STRINGS
- On certain targets, you can use this environment variable to select the implementation of
memset().
The value is one of the strings given below.
- for AArch64 targets:
- aarch64_neon — optimized for AARCH64 targets using NEON
- generic — the default
- for AArch64 targets:
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
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