+/**
+ * Writes the contents of an array of mostly invariant characters.
+ * Characters 0..0x1f are printed as numbers,
+ * others as characters with single quotes: '%c'.
+ *
+ * The prefix and postfix are optional (can be NULL) and are written first/last.
+ * The prefix may contain a %ld or similar field for the array length.
+ * The {} and declaration etc. need to be included in prefix/postfix or
+ * printed before and after the array contents.
+ */
+U_CAPI void U_EXPORT2
+usrc_writeArrayOfMostlyInvChars(FILE *f,
+ const char *prefix,
+ const char *p, int32_t length,
+ const char *postfix);
+