Release calc version 2.10.2t30

align32.c

@@ -0,0 +1,79 @@
+/*
+ * align32 - determine if 32 bit accesses must be aligned
+ *
+ * This file was written by:
+ *
+ *	 Landon Curt Noll  (chongo@toad.com)	chongo <was here> /\../\
+ *
+ * This code has been placed in the public domain.  Please do not
+ * copyright this code.
+ *
+ * LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH  REGARD  TO
+ * THIS  SOFTWARE,  INCLUDING  ALL IMPLIED WARRANTIES OF MER-
+ * CHANTABILITY AND FITNESS.  IN NO EVENT SHALL  LANDON  CURT
+ * NOLL  BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM  LOSS  OF
+ * USE,  DATA  OR  PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR  IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <signal.h>
+#include "longbits.h"
+
+#include "have_unistd.h"
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+
+static void buserr(void);	/* catch alignment errors */
+
+
+MAIN
+main(void)
+{
+	char byte[2*sizeof(USB32)];	/* mis-alignment buffer */
+	USB32 *p;			/* mis-alignment pointer */
+	int i;
+
+#if defined(MUST_ALIGN32)
+	/* force alignment */
+	printf("#define MUST_ALIGN32\t%c* forced to align 32 bit values *%c\n",
+	   '/', '/');
+#else
+	/* setup to catch alignment bus errors */
+	signal(SIGBUS, buserr);
+	signal(SIGSEGV, buserr);  /* some systems will generate SEGV instead! */
+
+	/* mis-align our long fetches */
+	for (i=0; i < sizeof(USB32); ++i) {
+		p = (USB32 *)(byte+i);
+		*p = i;
+		*p += 1;
+	}
+
+	/* if we got here, then we can mis-align longs */
+	printf("#undef MUST_ALIGN32\t%c* can mis-align 32 bit values *%c\n",
+	   '/', '/');
+
+#endif
+	exit(0);
+}
+
+
+/*
+ * buserr - catch an alignment error
+ *
+ * given:
+ *      arg             to keep ANSI C happy
+ */
+/*ARGSUSED*/
+static void
+buserr(int arg)
+{
+	/* alignment is required */
+	printf("#define MUST_ALIGN32\t%c* must align 32 bit values *%c\n",
+	  '/', '/');
+	exit(0);
+}