Add db_dump.cpp to the cxx tests

git-svn-id: file:///svn/tokudb@1201 c7de825b-a66e-492c-adef-691d508d4ae1

cxx/tests/db_dump.cpp

+#include <assert.h>
+#include <db_cxx.h>
+
+void hexdump(Dbt *d) {
+    unsigned char *cp = (unsigned char *) d->get_data();
+    int n = d->get_size();
+    printf(" ");
+    for (int i=0; i<n; i++)
+        printf("%2.2x", cp[i]);
+    printf("\n");
+}
+
+int dbdump(char *dbfile, char *dbname) {
+    int r;
+
+#if USE_ENV
+    DbEnv env(DB_CXX_NO_EXCEPTIONS);
+    r = env.open(".", DB_INIT_MPOOL + DB_CREATE + DB_PRIVATE, 0777); assert(r == 0);
+    Db db(&env, DB_CXX_NO_EXCEPTIONS);
+#else
+    Db db(0, DB_CXX_NO_EXCEPTIONS);
+#endif
+    r = db.open(0, dbfile, dbname, DB_BTREE, 0, 0777); 
+    if (r != 0) {
+        printf("cant open %s:%s\n", dbfile, dbname);
+#if USE_ENV
+        r = env.close(0); assert(r == 0);
+#endif
+        return 1;
+    }
+
+    Dbc *cursor;
+    r = db.cursor(0, &cursor, 0); assert(r == 0);
+
+    for (;;) {
+        Dbt key; key.set_flags(DB_DBT_MALLOC);
+        Dbt val; val.set_flags(DB_DBT_MALLOC);
+        r = cursor->get(&key, &val, DB_NEXT);
+        if (r != 0) break;
+        // printf("%.*s\n", key.get_size(), (char *)key.get_data());
+        hexdump(&key);
+        free(key.get_data());
+        // printf("%.*s\n", val.get_size(), (char *)val.get_data());
+        hexdump(&val);
+        free(val.get_data());
+    }
+    r = cursor->close(); assert(r == 0);
+    r = db.close(0); assert(r == 0);
+#if USE_ENV
+    r = env.close(0); assert(r == 0);
+#endif
+    return 0;
+}
+
+int usage() {
+    printf("db_dump [-s DBNAME] DBFILE\n");
+    return 1;
+}
+
+int main(int argc, char *argv[]) {
+    int i;
+
+    char *dbname = 0;
+    for (i=1; i<argc; i++) {
+        char *arg = argv[i];
+        if (0 == strcmp(arg, "-h") || 0 == strcmp(arg, "--help")) 
+            return usage();
+        if (0 == strcmp(arg, "-s")) {
+            i++;
+            if (i >= argc)
+                return usage();
+            dbname = argv[i];
+            continue;
+        }
+        break;
+    }
+
+    if (i >= argc)
+        return usage();
+    return dbdump(argv[i], dbname);
+}
+