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examples/utils.c: add --bufsize option and short message when option parsing went wrong (should never happen)

--- a/examples/utils.c

+++ b/examples/utils.c

@@ -104,6 +104,7 @@

                         "       -t      --threshold     Set onset detection threshold.\n"

                         "       -s      --silence       Select silence threshold.\n"

                         "       -p      --pitch         Select pitch detection algorithm.\n"

+                        "       -B      --bufsize       Set buffer size.\n"

                         "       -H      --hopsize       Set hopsize.\n"

                         "       -a      --averaging     Use averaging.\n"

                );

@@ -111,7 +112,7 @@

 }

 int parse_args (int argc, char **argv) {

-        const char *options = "hvjo:i:O:t:s:p:H:a";

+        const char *options = "hvjo:i:O:t:s:p:B:H:a";

         int next_option;

         struct option long_options[] =

         {

@@ -125,6 +126,7 @@

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

                 {"pitch"    , 1, NULL, 'p'},

                 {"averaging", 0, NULL, 'a'},

+                {"bufsize",   1, NULL, 'B'},

                 {"hopsize",   1, NULL, 'H'},

                 {NULL       , 0, NULL, 0}

         };

@@ -211,6 +213,9 @@

                         case 'a':

                                 averaging = 1;

                                 break; 

+                        case 'B':

+                                buffer_size = atoi(optarg);

+                                break;

                         case 'H':

                                 overlap_size = atoi(optarg);

                                 break;

@@ -220,6 +225,7 @@

                         case -1: /* done with options */

                                 break;

                         default: /*something else unexpected */

+                                fprintf(stderr, "Error parsing option '%c'\n", next_option);

                                 abort ();

                 }

         }