+#include <sys/types.h>
+#include <db.h>
+
+#ifndef DB_VERSION_MAJOR
+size_t prefix_cb (const DBT *key1, const DBT *key2)
+{
+}
+BTREEINFO info;
+int main()
+{
+ info.prefix = prefix_cb;
+}
+#endif
+EOCP
+ if $cc $ccflags -c try.c >try.out 2>&1 ; then
+ if $contains warning try.out >>/dev/null 2>&1 ; then
+ db_prefixtype='int'
+ else
+ db_prefixtype='size_t'
+ fi
+ else
+ db_prefixtype='size_t'
+ : XXX Maybe we should just give up here.
+ $cat try.out >&4
+ echo "Help: I can't seem to compile the db test program." >&4
+ echo "Something's wrong, but I'll assume you use $db_prefixtype." >&4
+ fi
+ $rm_try
+ echo "Your version of Berkeley DB uses $db_prefixtype for prefix."
+ ;;
+*) db_prefixtype='size_t'
+ ;;
+esac
+
+: Check what kind of inf/nan your system has
+$echo "Checking the kind of infinities and nans you have..." >&4
+$cat >try.c <<EOP
+#define DOUBLESIZE $doublesize
+#$d_longdbl HAS_LONG_DOUBLE
+#ifdef HAS_LONG_DOUBLE
+#define LONGDBLSIZE $longdblsize
+#define LONGDBLKIND $longdblkind
+#endif
+#$i_math I_MATH
+#ifdef I_MATH
+#include <math.h>
+#endif
+#include <stdio.h>
+/* Note that whether the sign bit is on or off
+ * for NaN depends on the CPU/FPU, and possibly
+ * can be affected by the build toolchain.
+ *
+ * For example for older MIPS and HP-PA 2.0 the quiet NaN is:
+ * 0x7f, 0xf7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+ * 0x7f, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+ * (respectively) as opposed to the more usual
+ * 0x7f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+ */
+static void bytes(unsigned char *p, unsigned int n) {
+ int i;
+ for (i = 0; i < n; i++) {
+ printf("0x%02x%s", p[i], i < n - 1 ? ", " : "\n");
+ }
+}
+int main(int argc, char *argv[]) {
+ /* We cannot use 1.0/0.0 and 0.0/0.0 (with L suffixes for long double)
+ * because some compilers are 'smart' and not only warn but refuse to
+ * compile such 'illegal' values. */
+ double dinf = exp(1e9);
+ double dnan = sqrt(-1.0);
+#ifdef HAS_LONG_DOUBLE
+ long double ldinf = (long double)exp(1e9);
+ long double ldnan = (long double)sqrt(-1.0);
+#endif
+ if (argc == 2) {
+ switch (argv[1][0]) {
+ case '1': bytes(&dinf, sizeof(dinf)); break;
+ case '2': bytes(&dnan, sizeof(dnan)); break;
+#ifdef HAS_LONG_DOUBLE
+# if LONG_DOUBLEKIND == 3 || LONG_DOUBLEKIND == 4
+/* the 80-bit long doubles might have garbage in their excess bytes */
+ memset((char *)&ldinf + 10, '\0', LONG_DOUBLESIZE - 10);
+# endif
+ case '3': bytes(&ldinf, sizeof(ldinf)); break;
+ case '4': bytes(&ldnan, sizeof(ldnan)); break;
+#endif
+ }
+ }
+ return 0;
+}
+EOP
+set try
+if eval $compile; then
+ doubleinfbytes=`$run ./try 1`
+ doublenanbytes=`$run ./try 2`
+ case "$d_longdbl" in
+ $define)
+ longdblinfbytes=`$run ./try 3`
+ longdblnanbytes=`$run ./try 4`
+ ;;
+ esac
+else
+ # Defaults in case the above test program failed.
+ case "$doublekind" in
+ 1) # IEEE 754 32-bit LE
+ doubleinfbytes='0x00, 0x00, 0xf0, 0x7f'
+ doublenanbytes='0x00, 0x00, 0xf8, 0x7f'
+ ;;
+ 2) # IEEE 754 32-bit BE
+ doubleinfbytes='0x7f, 0xf0, 0x00, 0x00'
+ doublenanbytes='0x7f, 0xf8, 0x00, 0x00'
+ ;;
+ 3) # IEEE 754 64-bit LE
+ doubleinfbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x7f'
+ doublenanbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x7f'
+ ;;
+ 4) # IEEE 754 64-bit BE
+ doubleinfbytes='0x7f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ doublenanbytes='0x7f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ ;;
+ 5) # IEEE 754 128-bit LE
+ doubleinfbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x7f'
+ doublenanbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x7f'
+ ;;
+ 6) # IEEE 754 128-bit BE
+ doubleinfbytes='0x7f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ doublenanbytes='0x7f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ ;;
+ 7) # IEEE 754 64-bit mixed: 32-bit LEs in BE
+ doubleinfbytes='0x00, 0x00, 0xf0, 0x7f, 0x00, 0x00, 0x00, 0x00'
+ doublenanbytes='0x00, 0x00, 0xf8, 0x7f, 0x00, 0x00, 0x00, 0x00'
+ ;;
+ 8) # IEEE 754 64-bit mixed: 32-bit BEs in LE
+ doubleinfbytes='0x00, 0x00, 0x00, 0x00, 0x7f, 0xf0, 0x00, 0x00'
+ doublenanbytes='0x00, 0x00, 0x00, 0x00, 0x7f, 0xf8, 0x00, 0x00'
+ ;;
+ *) # No idea.
+ doubleinfbytes=$undef
+ doublenanbytes=$undef
+ ;;
+ esac
+ case "$longdblkind" in
+ 1) # IEEE 754 128-bit LE
+ longdblinfbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x7f'
+ longdblnanbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xff, 0x7f'
+ ;;
+ 2) # IEEE 754 128-bit BE
+ longdblinfbytes='0x7f, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ longdblnanbytes='0x7f, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ ;;
+ 3) # IEEE 754 80-bit LE, 12 or 16 bytes (x86)
+ case "$longdblsize" in
+ 12) # x86 32-bit (96 bits, or 4 x 32, or 12 x 8)
+ longdblinfbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xff, 0x7f, 0x00, 0x00'
+ longdblnanbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xff, 0x7f, 0x00, 0x00'
+ ;;
+ 16) # x86_64
+ longdblinfbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ longdblnanbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ ;;
+ *) # No idea.
+ longdblinfbytes=$undef
+ longdblnanbytes=$undef
+ ;;
+ esac
+ ;;
+ 4) # IEEE 754 80-bit BE, 12 or 16 bytes
+ case "$longdblsize" in
+ 12) # 32-bit system
+ longdblinfbytes='0x7f, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ longdblnanbytes='0x7f, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ ;;
+ 16) # 64-bit system
+ longdblinfbytes='0x7f, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ longdblnanbytes='0x7f, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ ;;
+ *) # No idea.
+ longdblinfbytes=$undef
+ longdblnanbytes=$undef
+ ;;
+ esac
+ ;;
+ 5) # 128-bit LE-LE "double double"
+ longdblinfbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x7f'
+ longdblnanbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x7f'
+ ;;
+ 6) # 128-bit BE-BE "double double"
+ longdblinfbytes='0x7f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ longdblnanbytes='0x7f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ ;;
+ 7) # 128-bit LE-BE "double double"
+ longdblinfbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ longdblnanbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ ;;
+ 8) # 128-bit BE-LE "double double"
+ longdblinfbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ longdblnanbytes='0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00'
+ ;;
+ *) # No idea.
+ longdblinfbytes=$undef
+ longdblnanbytes=$undef
+ ;;
+ esac
+fi
+$rm_try
+
+: Check the length of the double mantissa
+$echo "Checking how many mantissa bits your doubles have..." >&4
+$cat >try.c <<EOP
+#$i_float I_FLOAT
+#$i_sunmath I_SUNMATH
+#ifdef I_FLOAT
+# include <float.h>
+#endif
+#ifdef I_SUNMATH
+# include <sunmath.h>
+#endif
+#ifdef DBL_MANT_DIG
+# define BITS (DBL_MANT_DIG - 1) /* the implicit bit does not count */
+#endif
+#include <stdio.h>
+int main(int argc, char *argv[]) {
+#ifdef BITS
+ printf("%d\n", BITS);
+#endif
+ return 0;