diff options
Diffstat (limited to 'U/d_safebcpy.U')
| -rw-r--r-- | U/d_safebcpy.U | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/U/d_safebcpy.U b/U/d_safebcpy.U new file mode 100644 index 0000000000..b7373a0791 --- /dev/null +++ b/U/d_safebcpy.U @@ -0,0 +1,81 @@ +?RCS: $Id: d_safebcpy.U,v 3.0 1993/08/18 12:06:58 ram Exp $ +?RCS: +?RCS: Copyright (c) 1991-1993, Raphael Manfredi +?RCS: +?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: +?RCS: $Log: d_safebcpy.U,v $ +?RCS: +?RCS: Copy "abcde..." string to char abc[] so that gcc doesn't +?RCS: try to store the string in read-only memory. +?RCS: +?RCS: Revision 3.0 1993/08/18 12:06:58 ram +?RCS: Baseline for dist 3.0 netwide release. +?RCS: +?MAKE:d_safebcpy: cat d_bcopy +cc +ccflags +libs rm Oldconfig Setvar +?MAKE: -pick add $@ %< +?S:d_safebcpy: +?S: This variable conditionally defines the HAS_SAFE_BCOPY symbol if +?S: the bcopy() routine can do overlapping copies. +?S:. +?C:HAS_SAFE_BCOPY (SAFE_BCOPY): +?C: This symbol, if defined, indicates that the bcopy routine is available +?C: to copy potentially overlapping memory blocks. Otherwise you should +?C: probably use memmove() or memcpy(). If neither is defined, roll your +?C: own version. +?C:. +?H:#$d_safebcpy HAS_SAFE_BCOPY /**/ +?H:. +?LINT: set d_safebcpy +: can bcopy handle overlapping blocks? +?X: assume the worst +val="$undef" +case "$d_bcopy" in +"$define") + echo " " + echo "Checking to see if your bcopy() can do overlapping copies..." >&4 + $cat >foo.c <<'EOCP' +main() +{ +char buf[128], abc[128]; +char *b; +int len; +int off; +int align; +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); + } + } +} +exit(0); +} +EOCP + if $cc foo.c -o safebcpy $ccflags $libs >/dev/null 2>&1 ; then + if ./safebcpy 2>/dev/null; then + echo "Yes, it can." + val="$define" + else + echo "It can't, sorry." + fi + else + echo "(I can't compile the test program, so we'll assume not...)" + fi + ;; +esac +$rm -f foo.* safebcpy core +set d_safebcpy +eval $setvar + |