display information about struct timestamp

1 files changed, 21 insertions, 5 deletions

diff --git a/src/ftdump.c b/src/ftdump.c
index 849d6ee..2871537 100644
--- a/src/ftdump.c
+++ b/src/ftdump.c
@@ -12,7 +12,7 @@ static void dump(struct timestamp* ts, size_t count)
         struct timestamp *x;
         while (count--) {
                 x = ts++;
-                printf("event:%d seq:%u cpu:%d type:%d\n", 
+                printf("event:%d seq:%u cpu:%d type:%d\n",
                        (int) x->event, x->seq_no, x->cpu, x->task_type);
         }
 }
@@ -21,15 +21,31 @@ static void die(char* msg)
 {
         if (errno)
                 perror("error: ");
-        fprintf(stderr, "%s\n", msg);   
+        fprintf(stderr, "%s\n", msg);
         exit(1);
 }
 
-int main(int argc, char** argv) 
+#define offset(type, member)  ((unsigned int) &((type *) 0)->member)
+
+int main(int argc, char** argv)
 {
         void* mapped;
         size_t size, count;
-        struct timestamp* ts;   
+        struct timestamp* ts;
+
+        printf("struct timestamp:\n"
+               "\t size              = %3lu\n"
+               "\t offset(timestamp) = %3u\n"
+               "\t offset(seq_no)    = %3u\n"
+               "\t offset(cpu)       = %3u\n"
+               "\t offset(event)     = %3u\n"
+               "\t offset(task_type) = %3u\n",
+               sizeof(struct timestamp),
+               offset(struct timestamp, timestamp),
+               offset(struct timestamp, seq_no),
+               offset(struct timestamp, cpu),
+               offset(struct timestamp, event),
+               offset(struct timestamp, task_type));
 
         if (argc != 2)
                 die("Usage: ftdump  <logfile>");
@@ -37,7 +53,7 @@ int main(int argc, char** argv)
                 die("could not map file");
 
         ts    = (struct timestamp*) mapped;
-        count = size / sizeof(struct timestamp);                
+        count = size / sizeof(struct timestamp);
 
         dump(ts, count);
         return 0;