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music: DMX's "GUS instrument mappings bug" emulation

--- a/src/gusconf.c

+++ b/src/gusconf.c

@@ -35,7 +35,9 @@

 typedef struct

 {

     char *patch_names[MAX_INSTRUMENTS];

+    int used[MAX_INSTRUMENTS];

     int mapping[MAX_INSTRUMENTS];

+    unsigned int count;

 } gus_config_t;

 char *gus_patch_path = "";

@@ -109,6 +111,7 @@

 static void ParseLine(gus_config_t *config, char *line)

 {

     char *fields[6];

+    unsigned int i;

     unsigned int num_fields;

     unsigned int instr_id, mapped_id;

@@ -120,11 +123,33 @@

     }

     instr_id = atoi(fields[0]);

+

+    // Skip non GM percussions.

+    if ((instr_id >= 128 && instr_id < 128 + 35) || instr_id > 128 + 81)

+    {

+        return;

+    }

+

     mapped_id = atoi(fields[MappingIndex()]);

-    free(config->patch_names[instr_id]);

-    config->patch_names[instr_id] = M_StringDuplicate(fields[5]);

-    config->mapping[instr_id] = mapped_id;

+    for (i = 0; i < config->count; i++)

+    {

+        if (config->used[i] == mapped_id)

+        {

+            break;

+        }

+    }

+    

+    if (i == config->count)

+    {

+        // DMX uses wrong patch name (we should use name of 'mapped_id'

+        // instrument, but DMX uses name of 'instr_id' instead).

+        free(config->patch_names[i]);

+        config->patch_names[i] = M_StringDuplicate(fields[5]);

+        config->used[i] = mapped_id;

+        config->count++;

+    }

+    config->mapping[instr_id] = i;

 }

 static void ParseDMXConfig(char *dmxconf, gus_config_t *config)

@@ -137,8 +162,11 @@

     for (i = 0; i < MAX_INSTRUMENTS; ++i)

     {

         config->mapping[i] = -1;

+        config->used[i] = -1;

     }

+    config->count = 0;

+

     p = dmxconf;

     for (;;)

@@ -225,8 +253,8 @@

     }

     fprintf(fstream, "\ndrumset 0\n\n");

-

-    for (i = 128 + 25; i < MAX_INSTRUMENTS; ++i)

+    

+    for (i = 128 + 35; i <= 128 + 81; ++i)

     {

         if (config->mapping[i] >= 0 && config->mapping[i] < MAX_INSTRUMENTS

          && config->patch_names[config->mapping[i]] != NULL)