16.8. Memory Block Handling

The functions listed in Table 16-21 initialize, copy, search, and compare blocks of memory. The functions declared in the header string.h access a memory block byte by byte, while those declared in wchar.h read and write units of the type wchar_t. Accordingly, the size parameter of each function indicates the size of a memory block as a number of bytes, or as a number of wide characters.

Table 16-21. Functions to manipulate blocks of memory

Purpose	Functions in string.h	Functions in wchar.h
Copy a memory block, where source and destination do not overlap	memcpy( )	wmemcpy( )
Copy a memory block, where source and destination may overlap	memmove( )	wmemmove( )
Compare two memory blocks	memcmp( )	wmemcmp( )
Find the first occurrence of a given character	memchr( )	wmemchr( )
Fill the memory block with a given character value	memset( )	wmemset( )