From 39db5071532630f38bc617e3b7d36dc3005ce3e1 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Wed, 1 Oct 2025 14:56:15 -0400
Subject: kern: ptrbox: Add string duplication

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 src/sys/include/lib/ptrbox.h | 12 ++++++++++++
 src/sys/lib/ptrbox.c         | 24 ++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

(limited to 'src')

diff --git a/src/sys/include/lib/ptrbox.h b/src/sys/include/lib/ptrbox.h
index a84a760..025ac06 100644
--- a/src/sys/include/lib/ptrbox.h
+++ b/src/sys/include/lib/ptrbox.h
@@ -96,4 +96,16 @@ int ptrbox_terminate(struct ptrbox *box);
  */
 void *ptrbox_alloc(size_t len, struct ptrbox *box);
 
+/*
+ * Duplicate a string and store it in a
+ * pointer box
+ *
+ * @s: String to duplicate
+ * @box: Box to do tracking
+ *
+ * Returns new heap string on success, otherwise NULL
+ * on failure
+ */
+char *ptrbox_strdup(const char *s, struct ptrbox *box);
+
 #endif  /* !_PTRBOX_H_ */
diff --git a/src/sys/lib/ptrbox.c b/src/sys/lib/ptrbox.c
index b8370e5..bc84145 100644
--- a/src/sys/lib/ptrbox.c
+++ b/src/sys/lib/ptrbox.c
@@ -116,3 +116,27 @@ ptrbox_init(struct ptrbox **box_res)
     *box_res = box;
     return 0;
 }
+
+/*
+ * String duplication
+ */
+char *
+ptrbox_strdup(const char *s, struct ptrbox *box)
+{
+    size_t len;
+    char *s_new;
+
+    if (s == NULL || box == NULL) {
+        return NULL;
+    }
+
+    len = strlen(s);
+    s_new = ptrbox_alloc(len + 1, box);
+    if (s_new == NULL) {
+        return NULL;
+    }
+
+    memcpy(s_new, s, len);
+    s_new[len] = '\0';
+    return s_new;
+}
-- 
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