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FreeBSD 11.0 - man page for memset (freebsd section 3)

MEMSET(3)						   BSD Library Functions Manual 						 MEMSET(3)

NAME
memset -- write a byte to byte string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <string.h> void * memset(void *b, int c, size_t len);
DESCRIPTION
The memset() function writes len bytes of value c (converted to an unsigned char) to the string b.
RETURN VALUES
The memset() function returns its first argument.
SEE ALSO
bzero(3), swab(3), wmemset(3)
STANDARDS
The memset() function conforms to ISO/IEC 9899:1990 (``ISO C90'').
BSD
June 4, 1993 BSD