pub unsafe extern "C" fn switch_core_vsprintf(
pool: *mut switch_memory_pool_t,
fmt: *const c_char,
ap: *mut __va_list_tag,
) -> *mut c_charpub unsafe extern "C" fn switch_core_vsprintf(
pool: *mut switch_memory_pool_t,
fmt: *const c_char,
ap: *mut __va_list_tag,
) -> *mut c_char