memcpy()
QNX SDP8.0C Library ReferenceAPIDeveloper
Copy bytes from one buffer to another
Synopsis:
#include <string.h>
void* memcpy( void* dst,
const void* src,
size_t length );
Arguments:
- dest
- A pointer to where you want the function to copy the data.
- src
- A pointer to the buffer that you want to copy data from.
- length
- The number of bytes to copy.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The memcpy() function copies length bytes from the buffer pointed to by src into the buffer pointed to by dst.
Note:
Copying overlapping buffers isn't guaranteed to work; use
memmove()
to copy buffers that overlap.
Returns:
A pointer to the destination buffer (that is, the value of dst).
Examples:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main( void )
{
char buffer[80];
memcpy( buffer, "Hello", 5 );
buffer[5] = '\0';
printf( "%s\n", buffer );
return EXIT_SUCCESS;
}
Environment variables:
- LIBC_STRINGS
- On certain targets, you can use this environment variable to select the implementation of
memcpy().
The value is one of the strings given below.
- for AArch64 targets:
- generic — the default
- for AArch64 targets:
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
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