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examples/: check if sink_uri exists, add -f to force overwrite

--- a/examples/parse_args.h

+++ b/examples/parse_args.h

@@ -40,6 +40,8 @@

 extern smpl_t silence_threshold;

 extern uint_t mix_input;

+extern uint_t force_overwrite;

+

 // functions defined in utils.c

 extern void examples_common_init (int argc, char **argv);

 extern void examples_common_del (void);

@@ -78,6 +80,7 @@

       "       -s      --silence          select silence threshold\n"

 #ifdef PROG_HAS_OUTPUT

       "       -m      --mix-input        mix input signal with output signal\n"

+      "       -f      --force-overwrite  overwrite output file if\n"

 #endif

 #ifdef PROG_HAS_JACK

       "       -j      --jack             use Jack\n"

@@ -105,7 +108,7 @@

 #ifdef PROG_HAS_PITCH

     "p:u:l:"

 #endif /* PROG_HAS_PITCH */

-    "s:m";

+    "s:mf";

   int next_option;

   struct option long_options[] = {

     {"help",                  0, NULL, 'h'},

@@ -131,6 +134,7 @@

 #endif /* PROG_HAS_PITCH */

     {"silence",               1, NULL, 's'},

     {"mix-input",             0, NULL, 'm'},

+    {"force-overwrite",       0, NULL, 'f'},

     {NULL,                    0, NULL, 0}

   };

   prog_name = argv[0];

@@ -155,6 +159,9 @@

         break;

       case 'o':

         sink_uri = optarg;

+        break;

+      case 'f':                /* force_overwrite flag */

+        force_overwrite = 1;

         break;

       case 'r':

         samplerate = atoi (optarg);

--- a/examples/utils.c

+++ b/examples/utils.c

@@ -53,6 +53,8 @@

 smpl_t silence_threshold = -90.;

 uint_t mix_input = 0;

+uint_t force_overwrite = 0;

+

 //

 // internal memory stuff

 aubio_source_t *this_source = NULL;

@@ -88,6 +90,12 @@

       samplerate = aubio_source_get_samplerate(this_source);

     }

     if (sink_uri != NULL) {

+      uint_t sink_exists = (access(sink_uri, F_OK) == 0 );

+      if (!force_overwrite && sink_exists) {

+        outmsg ("Output file %s already exists, use -f to overwrite.\n",

+            sink_uri);

+        exit (1);

+      }

       this_sink = new_aubio_sink ((char_t*)sink_uri, samplerate);

       if (this_sink == NULL) {

         outmsg ("Could not open output file %s\n", sink_uri);