mirror of https://github.com/python/cpython
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
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/***********************************************************
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Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
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Amsterdam, The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* A perhaps slow but I hope correct implementation of memmove */
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extern char *memcpy();
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char *
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memmove(dst, src, n)
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char *dst;
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char *src;
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int n;
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{
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char *realdst = dst;
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if (n <= 0)
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return dst;
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if (src >= dst+n || dst >= src+n)
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return memcpy(dst, src, n);
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if (src > dst) {
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while (--n >= 0)
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*dst++ = *src++;
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}
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else if (src < dst) {
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src += n;
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dst += n;
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while (--n >= 0)
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*--dst = *--src;
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}
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return realdst;
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}
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