memccpy.c

来自「Many C samples. It is a good sample for 」· C语言 代码 · 共 29 行

/*  File   : memccpy.c
    Author : Richard A. O'Keefe.
    Updated: 25 May 1984
    Defines: memccpy()

    memccpy(dst, src, chr, len)
    copies bytes from src to dst until either len bytes have been moved
    or a byte equal to chr has been moved.  In the former case it gives
    NullS as the value, in the latter a pointer to just after the place
    where "chr" was moved to in dst.  Note that copying stops after the
    first instance of "chr", and that remaining characters in "dst" are
    not changed in any way, no NUL being inserted or anything.

    See the "Character Comparison" section in the READ-ME file.
*/

#include "strings.h"

char *memccpy(dst, src, chr, len)
    register char *dst, *src;
    register int chr;		/* should be char */
    register int len;
    {
	while (--len >= 0)
	    if ((*dst++ = *src++) == chr) return dst;
	return NullS;
    }