1 files changed, 26 insertions, 0 deletions
diff --git a/kernel/libc/string/copy.c b/kernel/libc/string/copy.c
new file mode 100644
index 0000000..277c808
--- /dev/null
+++ b/kernel/libc/string/copy.c
@@ -0,0 +1,26 @@
+#include <assert.h>
+#include <kmalloc.h>
+#include <stddef.h>
+#include <string.h>
+
+char *copy_and_allocate_string(const char *s) {
+  size_t l = strlen(s);
+  char *r = kmalloc(l + 1);
+  if (!r)
+    return NULL;
+  return strncpy(r, s, l);
+}
+
+char *copy_and_allocate_user_string(const char *s) {
+  size_t len;
+  if (!is_valid_user_c_string(s, &len))
+    return NULL;
+  size_t real_len = strlen(s);
+  assert(real_len == len);
+  len = real_len;
+  char *r = kmalloc(len + 1);
+  if (!r)
+    return NULL;
+  strlcpy(r, s, len);
+  return r;
+}