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author | Igor Pashev <pashev.igor@gmail.com> | 2012-06-24 22:28:35 +0000 |
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committer | Igor Pashev <pashev.igor@gmail.com> | 2012-06-24 22:28:35 +0000 |
commit | 3950ffe2a485479f6561c27364d3d7df5a21d124 (patch) | |
tree | 468c6e14449d1b1e279222ec32f676b0311917d2 /src/lib/libast/comp/memmove.c | |
download | ksh-upstream.tar.gz |
Imported Upstream version 93u+upstream
Diffstat (limited to 'src/lib/libast/comp/memmove.c')
-rw-r--r-- | src/lib/libast/comp/memmove.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/lib/libast/comp/memmove.c b/src/lib/libast/comp/memmove.c new file mode 100644 index 0000000..9d5ba59 --- /dev/null +++ b/src/lib/libast/comp/memmove.c @@ -0,0 +1,53 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2011 AT&T Intellectual Property * +* and is licensed under the * +* Eclipse Public License, Version 1.0 * +* by AT&T Intellectual Property * +* * +* A copy of the License is available at * +* http://www.eclipse.org/org/documents/epl-v10.html * +* (with md5 checksum b35adb5213ca9657e911e9befb180842) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped + +#include <ast.h> + +#if _lib_memmove + +NoN(memmove) + +#else + +void* +memmove(void* to, const void* from, register size_t n) +{ + register char* out = (char*)to; + register char* in = (char*)from; + + if (n <= 0) /* works if size_t is signed or not */ + ; + else if (in + n <= out || out + n <= in) + return(memcpy(to, from, n)); /* hope it's fast*/ + else if (out < in) + do *out++ = *in++; while (--n > 0); + else + { + out += n; + in += n; + do *--out = *--in; while(--n > 0); + } + return(to); +} + +#endif |