Move everything into a new repo.

1 files changed, 22 insertions, 0 deletions

diff --git a/userland/libc/string/strndup.c b/userland/libc/string/strndup.c
new file mode 100644
index 0000000..ffb2088
--- /dev/null
+++ b/userland/libc/string/strndup.c
@@ -0,0 +1,22 @@
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+// The strndup() function shall be equivalent to the strdup() function,
+// duplicating the provided s in a new block of memory allocated as if
+// by using malloc(), with the exception being that strndup() copies at
+// most size plus one bytes into the newly allocated memory, terminating
+// the new string with a NUL character. If the length of s is larger
+// than size, only size bytes shall be duplicated. If size is larger
+// than the length of s, all bytes in s shall be copied into the new
+// memory buffer, including the terminating NUL character. The newly
+// created string shall always be properly terminated.
+char *strndup(const char *s, size_t size) {
+  size_t l = strlen(s);
+  size_t real_l = min(l, size);
+  char *r = malloc(real_l + 1);
+  if (!r)
+    return NULL;
+  strlcpy(r, s, real_l);
+  return r;
+}