| 1 | /* Copyright (C) 1998 Free Software Foundation, Inc.
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| 2 |
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| 3 | This program is free software; you can redistribute it and/or modify it
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| 4 | under the terms of the GNU General Public License as published by the
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| 5 | Free Software Foundation; either version 2, or (at your option) any
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| 6 | later version.
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| 7 |
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| 8 | This program is distributed in the hope that it will be useful,
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| 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 11 | GNU General Public License for more details.
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| 12 |
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| 13 | You should have received a copy of the GNU General Public License
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| 14 | along with this program; if not, write to the Free Software
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| 15 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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| 16 | USA. */
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| 17 |
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| 18 | /* Last ditch effort to support memmove: if user doesn't have
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| 19 | memmove or bcopy, we offer this sluggish implementation. */
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| 20 |
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| 21 | #include "config.h"
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| 22 | #ifndef HAVE_MEMMOVE
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| 23 |
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| 24 | #include <sys/types.h>
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| 25 | #ifdef HAVE_MEMORY_H
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| 26 | # include <memory.h>
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| 27 | #endif
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| 28 |
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| 29 | #ifndef VOID
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| 30 | # define VOID void
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| 31 | #endif
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| 32 |
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| 33 | VOID *
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| 34 | memmove(dest, src, len)
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| 35 | VOID *dest;
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| 36 | const VOID *src;
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| 37 | size_t len;
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| 38 | {
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| 39 | #ifdef HAVE_BCOPY
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| 40 | bcopy(src, dest, len);
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| 41 |
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| 42 | #else /*!HAVE_BCOPY*/
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| 43 | char *dp = dest;
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| 44 | const char *sp = src;
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| 45 |
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| 46 | # ifdef HAVE_MEMCPY
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| 47 | /* A special-case for non-overlapping regions, on the assumption
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| 48 | that there is some hope that the sytem's memcpy() implementaion
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| 49 | is better than our dumb fall-back one. */
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| 50 | if ((dp < sp && dp+len < sp) || (sp < dp && sp+len < dp))
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| 51 | return memcpy(dest, src, len);
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| 52 | # endif
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| 53 |
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| 54 | /* I tried real hard to avoid getting to this point.
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| 55 | You *really* ought to upgrade your system's libraries;
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| 56 | the performance of this implementation sucks. */
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| 57 | if (dp < sp)
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| 58 | {
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| 59 | while (len-- > 0)
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| 60 | *dp++ = *sp++;
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| 61 | }
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| 62 | else
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| 63 | {
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| 64 | if (dp == sp)
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| 65 | return dest;
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| 66 | dp += len;
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| 67 | sp += len;
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| 68 | while (len-- > 0)
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| 69 | *--dp = *--sp;
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| 70 | }
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| 71 | #endif /*!HAVE_BCOPY*/
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| 72 |
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| 73 | return dest;
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| 74 | }
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| 75 |
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| 76 | #endif /*!HAVE_MEMMOVE*/
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