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#pragma once
 
extern "C"
{
	#pragma function(memset)
	void *memset(void *dest, int c, size_t count)
	{
		char *bytes = (char *)dest;
		while (count--)
		{
			*bytes++ = (char)c;
		}
		return dest;
	}
 
	#pragma function(memcpy)
	void *memcpy(void *dest, const void *src, size_t count)
	{
		char *dest8 = (char *)dest;
		const char *src8 = (const char *)src;
		while (count--)
		{
			*dest8++ = *src8++;
		}
		return dest;
	}
}

prog.cpp:1:9: warning: #pragma once in main file
 #pragma once
         ^
prog.cpp:6:34: error: 'size_t' has not been declared
  void *memset(void *dest, int c, size_t count)
                                  ^
prog.cpp:17:44: error: 'size_t' has not been declared
  void *memcpy(void *dest, const void *src, size_t count)
                                            ^

Standard output is empty