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+?RCS: $Id: d_safebcpy.U,v 1997/02/28 15:40:58 ram Exp $
+?RCS: Copyright (c) 1991-1993, Raphael Manfredi
+?RCS: You may redistribute only under the terms of the Artistic Licence,
+?RCS: as specified in the README file that comes with the distribution.
+?RCS: You may reuse parts of this distribution only within the terms of
+?RCS: that same Artistic Licence; a copy of which may be found at the root
+?RCS: of the source tree for dist 3.0.
+?RCS: $Log: d_safebcpy.U,v $
+?RCS: Revision 1997/02/28 15:40:58 ram
+?RCS: patch61: improved overlapping copy check
+?RCS: patch61: comfort them if they have memmove
+?RCS: patch61: added ?F: metalint hint
+?RCS: Revision 1995/07/25 13:58:40 ram
+?RCS: patch56: re-arranged compile line to include ldflags before objects
+?RCS: Revision 1995/01/11 15:29:23 ram
+?RCS: patch45: added 'ldflags' to the test compile line (ADO)
+?RCS: Revision 1994/05/06 14:49:03 ram
+?RCS: patch23: ensure string is not optimized in read-only memory (ADO)
+?RCS: Revision 3.0 1993/08/18 12:06:58 ram
+?RCS: Baseline for dist 3.0 netwide release.
+?MAKE:d_safebcpy: cat d_bcopy +cc +optimize +ccflags +ldflags +libs rm \
+ d_memmove i_memory i_stdlib i_string i_unistd Oldconfig Setvar
+?MAKE: -pick add $@ %<
+?S: This variable conditionally defines the HAS_SAFE_BCOPY symbol if
+?S: the bcopy() routine can do overlapping copies.
+?C: This symbol, if defined, indicates that the bcopy routine is available
+?C: to copy potentially overlapping memory blocks. Otherwise you should
+?C: probably use memmove() or memcpy(). If neither is defined, roll your
+?C: own version.
+?H:#$d_safebcpy HAS_SAFE_BCOPY /**/
+?LINT: set d_safebcpy
+: can bcopy handle overlapping blocks?
+?X: assume the worst
+case "$d_bcopy" in
+ echo " "
+ echo "Checking to see if your bcopy() can do overlapping copies..." >&4
+ $cat >foo.c <<EOCP
+#$i_memory I_MEMORY
+#$i_stdlib I_STDLIB
+#$i_string I_STRING
+#$i_unistd I_UNISTD
+ $cat >>foo.c <<'EOCP'
+#include <stdio.h>
+#ifdef I_MEMORY
+# include <memory.h>
+#ifdef I_STDLIB
+# include <stdlib.h>
+#ifdef I_STRING
+# include <string.h>
+# include <strings.h>
+#ifdef I_UNISTD
+# include <unistd.h> /* Needed for NetBSD */
+char buf[128], abc[128];
+char *b;
+int len;
+int off;
+int align;
+?X: Copy "abcde..." string to char abc[] so that gcc doesn't
+?X: try to store the string in read-only memory.
+bcopy("abcdefghijklmnopqrstuvwxyz0123456789", abc, 36);
+for (align = 7; align >= 0; align--) {
+ for (len = 36; len; len--) {
+ b = buf+align;
+ bcopy(abc, b, len);
+ for (off = 1; off <= len; off++) {
+ bcopy(b, b+off, len);
+ bcopy(b+off, b, len);
+ if (bcmp(b, abc, len))
+ exit(1);
+ }
+ }
+ if $cc $optimize $ccflags $ldflags foo.c \
+ -o safebcpy $libs >/dev/null 2>&1; then
+ if ./safebcpy 2>/dev/null; then
+ echo "Yes, it can."
+ val="$define"
+ else
+ echo "It can't, sorry."
+ case "$d_memmove" in
+ "$define") echo "But that's Ok since you have memmove()." ;;
+ esac
+ fi
+ else
+ echo "(I can't compile the test program, so we'll assume not...)"
+ case "$d_memmove" in
+ "$define") echo "But that's Ok since you have memmove()." ;;
+ esac
+ fi
+ ;;
+$rm -f foo.* safebcpy core
+set d_safebcpy
+eval $setvar