From 4e922e81942c4f339d5b014c769f4591620add44 Mon Sep 17 00:00:00 2001
From: Unknown <gelotus@gmail.com>
Date: Thu, 25 Jun 2020 23:32:03 +0200
Subject: [PATCH] sends lib log to /dev/null in posix and added option (v) to
 reactivate

There in an error handling and messaging inside
---
 utils/nfc-mfclassic.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/utils/nfc-mfclassic.c b/utils/nfc-mfclassic.c
index a159990..28444c5 100644
--- a/utils/nfc-mfclassic.c
+++ b/utils/nfc-mfclassic.c
@@ -54,6 +54,12 @@
 #include <string.h>
 #include <ctype.h>
 
+#ifndef _WIN32
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#endif
+
 #include <nfc/nfc.h>
 
 #include "mifare.h"
@@ -571,7 +577,11 @@ static void
 print_usage(const char *pcProgramName)
 {
   printf("Usage: ");
+  #ifndef _WIN32
+  printf("%s f|r|R|w|W a|b u|U<01ab23cd> <dump.mfd> [<keys.mfd> [f] [v]]\n", pcProgramName);
+  #else
   printf("%s f|r|R|w|W a|b u|U<01ab23cd> <dump.mfd> [<keys.mfd> [f]]\n", pcProgramName);
+  #endif
   printf("  f|r|R|w|W     - Perform format (f) or read from (r) or unlocked read from (R) or write to (w) or unlocked write to (W) card\n");
   printf("                  *** format will reset all keys to FFFFFFFFFFFF and all data to 00 and all ACLs to default\n");
   printf("                  *** unlocked read does not require authentication and will reveal A and B keys\n");
@@ -582,7 +592,9 @@ print_usage(const char *pcProgramName)
   printf("  <dump.mfd>    - MiFare Dump (MFD) used to write (card to MFD) or (MFD to card)\n");
   printf("  <keys.mfd>    - MiFare Dump (MFD) that contain the keys (optional)\n");
   printf("  f             - Force using the keyfile even if UID does not match (optional)\n");
-
+  #ifndef _WIN32
+  printf("  v             - Sends libnfc log output to console (optional)\n");
+  #endif
   printf("Examples: \n\n");
   printf("  Read card to file, using key A:\n\n");
   printf("    %s r a u mycard.mfd\n\n", pcProgramName);
@@ -706,6 +718,21 @@ main(int argc, const char *argv[])
     tag_uid = NULL;
   }
 
+  #ifndef _WIN32
+    // Send noise from lib to /dev/null
+    bool verbose = false;
+    if (argv[7]) {
+      if (strcmp(argv[7], "v") == 0) verbose = true;
+    } else {
+      if (strcmp(argv[6], "v") == 0) verbose = true;
+    }
+    if (!verbose) {
+      int fd = open("/dev/null", O_WRONLY);
+      dup2(fd, 2);
+      close(fd);
+    }
+  #endif
+
   if (atAction == ACTION_USAGE) {
     print_usage(argv[0]);
     exit(EXIT_FAILURE);