memset.c

把fortran语言编的程序转为c语言编的程序, 运行环境linux

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Copyright 1990 by AT&T Bell Laboratories and Bellcore.

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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
memcmp(s1, s2, n)
 register char *s1, *s2;
 int n;
{
	register char *se;

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

 char *
memcpy(s1, s2, n)
 register char *s1, *s2;
 int n;
{
	register char *s0 = s1, *se = s1 + n;

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

memset(s, c, n)
 register char *s;
 register int c;
 int n;
{
	register char *se = s + n;

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