30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/* Copy memory to memory until the specified number of bytes
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has been copied. Overlap is handled correctly.
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Copyright (C) 1991-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <string.h>
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#include <memcopy.h>
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/* All this is so that bcopy.c can #include
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this file after defining some things. */
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#ifndef a1
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#define a1 dest /* First arg is DEST. */
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#define a1const
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#define a2 src /* Second arg is SRC. */
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#define a2const const
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#undef memmove
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#endif
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#if !defined(RETURN) || !defined(rettype)
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#define RETURN(s) return (s) /* Return DEST. */
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#define rettype void *
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#endif
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#ifndef MEMMOVE
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#define MEMMOVE memmove
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#endif
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rettype
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inhibit_loop_to_libcall
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MEMMOVE (a1const void *a1, a2const void *a2, size_t len)
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{
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unsigned long int dstp = (long int) dest;
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unsigned long int srcp = (long int) src;
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/* This test makes the forward copying code be used whenever possible.
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Reduces the working set. */
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if (dstp - srcp >= len) /* *Unsigned* compare! */
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{
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/* Copy from the beginning to the end. */
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#if MEMCPY_OK_FOR_FWD_MEMMOVE
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dest = memcpy (dest, src, len);
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#else
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/* If there not too few bytes to copy, use word copy. */
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if (len >= OP_T_THRES)
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{
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/* Copy just a few bytes to make DSTP aligned. */
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len -= (-dstp) % OPSIZ;
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BYTE_COPY_FWD (dstp, srcp, (-dstp) % OPSIZ);
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/* Copy whole pages from SRCP to DSTP by virtual address
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manipulation, as much as possible. */
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PAGE_COPY_FWD_MAYBE (dstp, srcp, len, len);
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/* Copy from SRCP to DSTP taking advantage of the known
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alignment of DSTP. Number of bytes remaining is put
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in the third argument, i.e. in LEN. This number may
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vary from machine to machine. */
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WORD_COPY_FWD (dstp, srcp, len, len);
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/* Fall out and copy the tail. */
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}
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/* There are just a few bytes to copy. Use byte memory operations. */
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BYTE_COPY_FWD (dstp, srcp, len);
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#endif /* MEMCPY_OK_FOR_FWD_MEMMOVE */
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}
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else
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{
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/* Copy from the end to the beginning. */
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srcp += len;
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dstp += len;
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/* If there not too few bytes to copy, use word copy. */
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if (len >= OP_T_THRES)
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{
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/* Copy just a few bytes to make DSTP aligned. */
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len -= dstp % OPSIZ;
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BYTE_COPY_BWD (dstp, srcp, dstp % OPSIZ);
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/* Copy from SRCP to DSTP taking advantage of the known
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alignment of DSTP. Number of bytes remaining is put
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in the third argument, i.e. in LEN. This number may
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vary from machine to machine. */
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WORD_COPY_BWD (dstp, srcp, len, len);
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/* Fall out and copy the tail. */
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}
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/* There are just a few bytes to copy. Use byte memory operations. */
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BYTE_COPY_BWD (dstp, srcp, len);
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}
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RETURN (dest);
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}
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#ifndef memmove
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libc_hidden_builtin_def (memmove)
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#endif
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