memset.c

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/* This is for the benefit of people whose systems don't provide
 * memset, memcpy, and memcmp.  If yours is such a system, adjust
 * the makefile by adding memset.o to the "OBJECTS =" assignment.
 * WARNING: the memcpy below is adequate for f2c, but is not a
 * general memcpy routine (which must correctly handle overlapping
 * fields).
 */

 int
#ifdef KR_headers
memcmp(s1, s2, n) char *s1, *s2; int n;
#else
memcmp(char *s1, char *s2, int n)
#endif
{
        char *se;

        for(se = s1 + n; s1 < se; s1++, s2++)
                if (*s1 != *s2)
                        return *s1 - *s2;
        return 0;
        }

 char *
#ifdef KR_headers
memcpy(s1, s2, n) char *s1, *s2; int n;
#else
memcpy(char *s1, char *s2, int n)
#endif
{
        char *s0 = s1, *se = s1 + n;

        while(s1 < se)
                *s1++ = *s2++;
        return s0;
        }

 void
#ifdef KR_headers
memset(s, c, n) char *s; int c, n;
#else
memset(char *s, int c, int n)
#endif
{
        char *se = s + n;

        while(s < se)
                *s++ = c;
        }

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