Function xmlMemMalloc 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlMemMalloc(size: usize) -> *mut c_void

Allocate memory (legacy name; same contract as xmlMalloc).

void *xmlMemMalloc(size_t size);

SAFETY

The function touches crate-global state only; it is safe as long as the caller respects the library’s global initialization/cleanup ordering (xmlInitParser before use, xmlCleanupParser only after all users are done).

Violating the global lifecycle ordering, or calling this after teardown or from a signal handler, is undefined behavior.