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Diffstat (limited to 'mcon/U/d_sanemcmp.U')
| -rw-r--r-- | mcon/U/d_sanemcmp.U | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/mcon/U/d_sanemcmp.U b/mcon/U/d_sanemcmp.U new file mode 100644 index 0000000..07d1f84 --- /dev/null +++ b/mcon/U/d_sanemcmp.U @@ -0,0 +1,88 @@ +?RCS: $Id$ +?RCS: +?RCS: Copyright (c) 1991-1997, 2004-2006, 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 4.0. +?RCS: +?RCS: $Log: d_sanemcmp.U,v $ +?RCS: Revision 3.0.1.1 1997/02/28 15:41:19 ram +?RCS: patch61: created +?RCS: +?RCS: +?MAKE:d_sanemcmp: cat d_memcmp +cc +optimize +ccflags +libs +ldflags rm \ + i_memory i_stdlib i_string i_unistd Oldconfig Setvar +?MAKE: -pick add $@ %< +?S:d_sanemcmp: +?S: This variable conditionally defines the HAS_SANE_MEMCMP symbol if +?S: the memcpy() routine is available and can be used to compare relative +?S: magnitudes of chars with their high bits set. +?S:. +?C:HAS_SANE_MEMCMP: +?C: This symbol, if defined, indicates that the memcmp routine is available +?C: and can be used to compare relative magnitudes of chars with their high +?C: bits set. If it is not defined, roll your own version. +?C:. +?H:#$d_sanemcmp HAS_SANE_MEMCMP /**/ +?H:. +?F:!sanemcmp +?LINT: set d_sanemcmp +: can memcmp be trusted to compare relative magnitude? +?X: assume the worst +val="$undef" +case "$d_memcmp" in +"$define") + echo " " + echo \ + "Checking to see if your memcmp() can compare relative magnitude..." >&4 + $cat >foo.c <<EOCP +#$i_memory I_MEMORY +#$i_stdlib I_STDLIB +#$i_string I_STRING +#$i_unistd I_UNISTD +EOCP + $cat >>foo.c <<'EOCP' +#include <stdio.h> +#ifdef I_MEMORY +# include <memory.h> +#endif +#ifdef I_STDLIB +# include <stdlib.h> +#endif +#ifdef I_STRING +# include <string.h> +#else +# include <strings.h> +#endif +#ifdef I_UNISTD +# include <unistd.h> /* Needed for NetBSD */ +#endif +int main() +{ +char a = -1; +char b = 0; +if ((a < b) && memcmp(&a, &b, 1) < 0) + exit(1); +exit(0); +} +EOCP + if $cc $optimize $ccflags $ldflags \ + -o sanemcmp foo.c $libs >/dev/null 2>&1; then + if ./sanemcmp 2>/dev/null; then + echo "Yes, it can." + val="$define" + else + echo "No, it can't (it uses signed chars)." + fi + else + echo "(I can't compile the test program, so we'll assume not...)" + fi + ;; +esac +$rm -f foo.* sanemcmp core +set d_sanemcmp +eval $setvar + |