plugin argparse update to add userdata to callback

fix a couple of gotchas if you aren't using NULL terminated strings

Change-Id: If5d2a60c0c3e1653e26df50bfda7d3191989bca9

apps/plugins/lib/arg_helper.c

@@ -44,6 +44,11 @@ int string_parse(const char **parameter, char* buf, size_t buf_sz)
     char stopchars[] = "\'\"";
     int skipped = 0;
     int found = 0;
+    if (!parameter || !*parameter)
+    {
+        *buf = '\0';
+        return 0;
+    }
     const char* start = *parameter;
 
     if (strchr(stopchars, *start))
@@ -95,6 +100,8 @@ int bool_parse(const char **parameter, bool *choice)
 /* determine true false using the first character the rest are skipped/ignored */
     int found = 0;
     const char tf_val[]="fn0ty1";/* false chars on left f/t should be balanced fffttt */
+    if (!parameter || !*parameter)
+        return 0;
     const char* start = *parameter;
 
 
@@ -133,6 +140,8 @@ int longnum_parse(const char **parameter, long *number, long *decimal)
     int neg = 0;
     int digits = 0;
     //logf ("n: %s\n", *parameter);
+    if (!parameter || !*parameter)
+        return 0;
     const char* start = *parameter;
 
     if (*start == '-')
@@ -209,7 +218,8 @@ int num_parse(const char **parameter, int *number, int *decimal)
 * Note: WS at beginning is stripped, **parameter starts at the first NON WS char
 * return 0 for arg_callback to quit parsing immediately
 */
-void argparse(const char *parameter, int parameter_len, int (*arg_callback)(char argchar, const char **parameter))
+void argparse(const char *parameter, int parameter_len, void *userdata,
+        int (*arg_callback)(char argchar, const char **parameter, void *userdata))
 {
     bool lastchr;
     char argchar;
@@ -222,7 +232,10 @@ void argparse(const char *parameter, int parameter_len, int (*arg_callback)(char
             {
                 if ((*parameter) == '\0')
                     return;
-                logf ("%s\n",parameter);
+
+                if (parameter_len < 0) { logf ("%s\n", parameter); }
+                else { logf ("%.*s\n", plen, parameter); }
+
                 argchar = *parameter;
                 lastchr = (*(parameter + 1) == '\0');
                 while (*++parameter || lastchr)
@@ -230,7 +243,7 @@ void argparse(const char *parameter, int parameter_len, int (*arg_callback)(char
                     lastchr = false;
                     if (isspace(*parameter))
                         continue; /* eat spaces at beginning */
-                    if (!arg_callback(argchar, &parameter))
+                    if (!arg_callback(argchar, &parameter, userdata))
                         return;
                     break;
                 }

apps/plugins/lib/arg_helper.h

@@ -54,7 +54,7 @@ int num_parse(const char **parameter, int *number, int *decimal);
 * Note: WS at beginning is stripped, **parameter starts at the first NON WS char
 * return 0 for arg_callback to quit parsing immediately
 */
-void argparse(const char *parameter, int parameter_len,
+void argparse(const char *parameter, int parameter_len, void *userdata,
-              int (*arg_callback)(char argchar, const char **parameter));
+         int (*arg_callback)(char argchar, const char **parameter, void *userdata));
 
 #endif /* _LIB_ARG_HELPER_H_ */

apps/plugins/pitch_screen.c

@@ -1120,8 +1120,9 @@ int gui_syncpitchscreen_run(void)
     return 0;
 }
 
-static int arg_callback(char argchar, const char **parameter)
+static int arg_callback(char argchar, const char **parameter, void *userdata)
 {
+    (void)userdata;
     int ret;
     long num, dec;
     bool bret;
@@ -1232,7 +1233,7 @@ enum plugin_status plugin_start(const void* parameter)
         struct pvars cur;
         fill_pitchvars(&cur);
         fill_pitchvars(&pitch_vars);
-        argparse((const char*) parameter, -1, &arg_callback);
+        argparse((const char*) parameter, -1, NULL, &arg_callback);
         if (pitch_vars.pitch != cur.pitch)
         {
             rb->sound_set_pitch(pitch_vars.pitch);