Function mi_heap_strndup

3rd/mimalloc-2.0.9/src/alloc.c:781–791

// `strndup` using mi_malloc
mi_decl_nodiscard mi_decl_restrict char* mi_heap_strndup(mi_heap_t* heap, const char* s, size_t n) mi_attr_noexcept {
  if (s == NULL) return NULL;
  const char* end = (const char*)memchr(s, 0, n);  // find end of string in the first `n` characters (returns NULL if not found)
  const size_t m = (end != NULL ? (size_t)(end - s) : n);  // `m` is the minimum of `n` or the end-of-string
  mi_assert_internal(m <= n);
  char* t = (char*)mi_heap_malloc(heap, m+1);
  if (t == NULL) return NULL;
  _mi_memcpy(t, s, m);
  t[m] = 0;
  return t;
}

mi_decl_nodiscard mi_decl_restrict char* mi_strndup(const char* s, size_t n) mi_attr_noexcept {
  return mi_heap_strndup(mi_get_default_heap(),s,n);