Function xstrndup

gguf-tools/deepseek4-quantize.c:101–106

static void *xrealloc(void *p, size_t n) {
    void *q = realloc(p, n ? n : 1);
    if (!q) die("out of memory");
    return q;
}

static char *xstrdup(const char *s) {
    size_t n = strlen(s);
    char *p = xmalloc(n + 1);
    memcpy(p, s, n + 1);