Do some tests based on the type of floating-point arithmetic tcpdump does.

[tcpdump] / tcpdump.c

diff --git a/tcpdump.c b/tcpdump.c
index 64aad1603d2a2cc771eb8ec3d77f5a5549375de9..40505b2c28c75a3cbda8c6144920738d4e4efb5f 100644 (file)
--- a/tcpdump.c
+++ b/tcpdump.c
@@ -150,6 +150,8 @@ The Regents of the University of California.  All rights reserved.\n";
 
 #include "print.h"
 
+#include "fptype.h"
+
 #ifndef PATH_MAX
 #define PATH_MAX 1024
 #endif
@@ -687,6 +689,7 @@ show_remote_devices_and_exit(void)
 #define OPTION_LIST_REMOTE_INTERFACES  132
 #define OPTION_TSTAMP_MICRO            133
 #define OPTION_TSTAMP_NANO             134
+#define OPTION_FP_TYPE                 135
 
 static const struct option longopts[] = {
 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
@@ -730,6 +733,7 @@ static const struct option longopts[] = {
        { "debug-filter-parser", no_argument, NULL, 'Y' },
 #endif
        { "relinquish-privileges", required_argument, NULL, 'Z' },
+       { "fp-type", no_argument, NULL, OPTION_FP_TYPE },
        { "number", no_argument, NULL, '#' },
        { "print", no_argument, NULL, OPTION_PRINT },
        { "version", no_argument, NULL, OPTION_VERSION },
@@ -1891,6 +1895,26 @@ main(int argc, char **argv)
                        break;
 #endif
 
+               case OPTION_FP_TYPE:
+                       /*
+                        * Print out the type of floating-point arithmetic
+                        * we're doing; it's probably IEEE, unless somebody
+                        * tries to run this on a VAX, but the precision
+                        * may differ (e.g., it might be 32-bit, 64-bit,
+                        * or 80-bit).
+                        */
+                       switch (float_type_check(0x4e93312d)) {
+
+                       case 0x461a5794:
+                               printf("FPTYPE1\n");
+                               break;
+
+                       default:
+                               printf("FPTYPE2\n");
+                               break;
+                       }
+                       return 0;
+
                default:
                        print_usage();
                        exit_tcpdump(S_ERR_HOST_PROGRAM);