Name: memset()
|
System call or function: Function |
Links: Online Manual | Course Packet |
What it does: sets each of n
bytes starting at memory location s
(so, from s
to s + n - 1
) to the character c
(e.g.: for c = 'A'
, the memory starting at s
will include "AAAA..."
). |
What libraries you must include: #include <string.h> // Defines memset().
|
Syntax: void * memset (void *s, int c, size_t n);
|
Description of arguments: s
: a pointer to some allocated memory (doesn't need to be the start.)
c
: the character you want to set as the content of each of the bytes from from s
to s + n - 1
.
n
: the number of characters you want to set to c
.
|
What type it returns: void*
|
On success: It returns its 1st argument: the pointer s
. |
On failure: If s
is an invalid pointer, or if s + n - 1
is beyond the end of the allocated memory, the behavior of memset()
is undefined. |
If failure, does it set errno
? No |
Quick example: memset (arr, '\0', 10); // Setting 10 chars starting at 'arr' to the null character.
|
| Other variations: N/A |
These notes by Miriam Briskman are licensed under CC BY-NC 4.0 and based on sources.