Compatibility shim for tools that export `ubrk_clone` (libicucore.A.dylib)

libicucore_shim.c

// Fix for dyld[8734]: Symbol not found: _ubrk_clone
// more info: https://github.com/oven-sh/bun/issues/6035

// cc -shared main.c -o libicucore_shim.dylib -Wl,-reexport-licucore -current_version 1.0.0 -compatibility_version 1.0.0
// install_name_tool -change /usr/lib/libicucore.A.dylib /usr/local/lib/libicucore_shim.dylib target_binary

#include <stdlib.h>
#include <stdint.h>

typedef struct UBreakIterator UBreakIterator;

typedef int32_t UErrorCode;
enum {
    U_ZERO_ERROR = 0,
    U_ILLEGAL_ARGUMENT_ERROR = 1,
    U_MEMORY_ALLOCATION_ERROR = 7
};

extern UBreakIterator *ubrk_safeClone(const UBreakIterator *bi, void *stackBuffer, int32_t *pBufferSize, UErrorCode *status);

__attribute__((visibility("default")))
UBreakIterator * ubrk_clone(const UBreakIterator *bi, UErrorCode *status) {
    if (status == NULL) return NULL;
    if (*status != U_ZERO_ERROR) return NULL;
    if (bi == NULL) {
        *status = U_ILLEGAL_ARGUMENT_ERROR;
        return NULL;
    }

    int32_t needed = 0;
    UBreakIterator *it = ubrk_safeClone(bi, NULL, &needed, status);
    if (it != NULL) return it;

    if (*status != U_ZERO_ERROR && *status != U_MEMORY_ALLOCATION_ERROR) {
        return NULL;
    }

    if (needed <= 0) {
        *status = U_MEMORY_ALLOCATION_ERROR;
        return NULL;
    }

    void *buf = malloc((size_t)needed);
    if (!buf) {
        *status = U_MEMORY_ALLOCATION_ERROR;
        return NULL;
    }

    *status = U_ZERO_ERROR;
    it = ubrk_safeClone(bi, buf, &needed, status);

    return it;
}