add support for external command mutating files which have effective coverage feedback
diff --git a/cmdline.c b/cmdline.c
index fe40c86..9d203fa 100644
--- a/cmdline.c
+++ b/cmdline.c
@@ -274,6 +274,7 @@
                 .fuzzStdin = false,
                 .externalCommand = NULL,
                 .postExternalCommand = NULL,
+                .feedbackMutateCommand = NULL,
                 .persistent = false,
                 .netDriver = false,
                 .asLimit = 0U,
@@ -420,6 +421,7 @@
         { { "stackhash_bl", required_argument, NULL, 'B' }, "Stackhashes blacklist file (one entry per line)" },
         { { "mutate_cmd", required_argument, NULL, 'c' }, "External command producing fuzz files (instead of internal mutators)" },
         { { "pprocess_cmd", required_argument, NULL, 0x104 }, "External command postprocessing files produced by internal mutators" },
+        { { "ffmutate_cmd", required_argument, NULL, 0x110 }, "External command mutating files which have effective coverage feedback" },
         { { "run_time", required_argument, NULL, 0x109 }, "Number of seconds this fuzzing session will last (default: 0 [no limit])" },
         { { "iterations", required_argument, NULL, 'N' }, "Number of fuzzing iterations (default: 0 [no limit])" },
         { { "rlimit_as", required_argument, NULL, 0x100 }, "Per process RLIMIT_AS in MiB (default: 0 [no limit])" },
@@ -594,6 +596,9 @@
             case 0x104:
                 hfuzz->exe.postExternalCommand = optarg;
                 break;
+            case 0x110:
+                hfuzz->exe.feedbackMutateCommand = optarg;
+                break;    
             case 0x105:
                 if ((strcasecmp(optarg, "0") == 0) || (strcasecmp(optarg, "false") == 0)) {
                     hfuzz->cfg.monitorSIGABRT = false;