#include <stddef.h>

void* memmove(void* dest, const void* src, unsigned long n) {
    unsigned char* d = (unsigned char*)dest;
    const unsigned char* s = (const unsigned char*)src;
    if (d < s) {
        while (n--) *d++ = *s++;
    } else {
        d += n; s += n;
        while (n--) *--d = *--s;
    }
    return dest;
}

void* memcpy(void* dest, const void* src, unsigned long n) {
    return memmove(dest, src, n);
}

void* memset(void* dest, int c, unsigned long n) {
    unsigned char* d = (unsigned char*)dest;
    while (n--) *d++ = (unsigned char)c;
    return dest;
}

// Stack protection
long __stack_chk_guard = (long)0xDEADBEEFCAFEBABEULL;
void __stack_chk_fail(void) { while (1); }

// Swift embedded uses putchar for print(); stub so it links but does nothing
int putchar(int c) { return c; }

// Swift runtime allocator stubs — should never be called in embedded mode
int posix_memalign(void** ptr, unsigned long align, unsigned long size) {
    (void)ptr; (void)align; (void)size;
    while (1);
}

void free(void* ptr) { (void)ptr; }