1 ?RCS: $Id: d_safebcpy.U,v 3.0.1.4 1997/02/28 15:40:58 ram Exp $
3 ?RCS: Copyright (c) 1991-1993, Raphael Manfredi
5 ?RCS: You may redistribute only under the terms of the Artistic Licence,
6 ?RCS: as specified in the README file that comes with the distribution.
7 ?RCS: You may reuse parts of this distribution only within the terms of
8 ?RCS: that same Artistic Licence; a copy of which may be found at the root
9 ?RCS: of the source tree for dist 3.0.
11 ?RCS: $Log: d_safebcpy.U,v $
12 ?RCS: Revision 3.0.1.4 1997/02/28 15:40:58 ram
13 ?RCS: patch61: improved overlapping copy check
14 ?RCS: patch61: comfort them if they have memmove
15 ?RCS: patch61: added ?F: metalint hint
17 ?RCS: Revision 3.0.1.3 1995/07/25 13:58:40 ram
18 ?RCS: patch56: re-arranged compile line to include ldflags before objects
20 ?RCS: Revision 3.0.1.2 1995/01/11 15:29:23 ram
21 ?RCS: patch45: added 'ldflags' to the test compile line (ADO)
23 ?RCS: Revision 3.0.1.1 1994/05/06 14:49:03 ram
24 ?RCS: patch23: ensure string is not optimized in read-only memory (ADO)
26 ?RCS: Revision 3.0 1993/08/18 12:06:58 ram
27 ?RCS: Baseline for dist 3.0 netwide release.
29 ?MAKE:d_safebcpy: cat d_bcopy Compile rm_try run \
30 d_memmove i_memory i_stdlib i_string i_unistd Oldconfig Setvar
31 ?MAKE: -pick add $@ %<
33 ?S: This variable conditionally defines the HAS_SAFE_BCOPY symbol if
34 ?S: the bcopy() routine can do overlapping copies. Normally, you
35 ?S: should probably use memmove().
37 ?C:HAS_SAFE_BCOPY (SAFE_BCOPY):
38 ?C: This symbol, if defined, indicates that the bcopy routine is available
39 ?C: to copy potentially overlapping memory blocks. Normally, you should
40 ?C: probably use memmove() or memcpy(). If neither is defined, roll your
43 ?H:#$d_safebcpy HAS_SAFE_BCOPY /**/
47 : can bcopy handle overlapping blocks?
52 "$define") echo "I'll use memmove() instead of bcopy() for overlapping copies." ;;
55 echo "Checking to see if bcopy() can do overlapping copies..." >&4
76 # include <unistd.h> /* Needed for NetBSD */
80 char buf[128], abc[128];
86 /* Copy "abcde..." string to char abc[] so that gcc doesn't
87 try to store the string in read-only memory. */
88 bcopy("abcdefghijklmnopqrstuvwxyz0123456789", abc, 36);
90 for (align = 7; align >= 0; align--) {
91 for (len = 36; len; len--) {
94 for (off = 1; off <= len; off++) {
97 if (bcmp(b, abc, len))
106 if eval $compile_ok; then
107 if $run ./try 2>/dev/null; then
111 echo "It can't, sorry."
114 echo "(I can't compile the test program, so we'll assume not...)"