memset.c

一组基础的C库的实现

/* $Id: memset.c 262 2006-11-16 07:34:57Z solar $ */

/* Release $Name$ */

/* memset( void *, int, size_t )

   This file is part of the Public Domain C Library (PDCLib).
   Permission is granted to use, modify, and / or redistribute at will.
*/

#include <string.h>

#ifndef REGTEST

void * memset( void * s, int c, size_t n )
{
    unsigned char * p = (unsigned char *) s;
    while ( n-- )
    {
        *p++ = (unsigned char) c;
    }
    return s;
}

#endif

#ifdef TEST
#include <_PDCLIB_test.h>

int main()
{
    char s[] = "xxxxxxxxx";
    BEGIN_TESTS;
    TESTCASE( memset( s, 'o', 10 ) == s );
    TESTCASE( s[9] == 'o' );
    TESTCASE( memset( s, '_', 0 ) == s );
    TESTCASE( s[0] == 'o' );
    TESTCASE( memset( s, '_', 1 ) == s );
    TESTCASE( s[0] == '_' );
    TESTCASE( s[1] == 'o' );
    return TEST_RESULTS;
}
#endif