history when getting line from user in knob

1 files changed, 11 insertions, 1 deletions

diff --git a/src/user/knob/block.c b/src/user/knob/block.c
index 4ec0564..94bd073 100644
--- a/src/user/knob/block.c
+++ b/src/user/knob/block.c
@@ -1,5 +1,6 @@
-#include <stdint.h>
 #include <stdbool.h>
+#include <stdint.h>
+#include <knob/heap.h>
 
 //unsophisticated, should copy by dwords where available
 void blockcpy(void *to, const void *from, uint32_t size) {
@@ -23,4 +24,13 @@ uint32_t strcpy(char *to, const char *from) {
     to[i] = from[i];
   while (from[i++]);
   return i - 1;
+}
+
+char *strdup(const char *from) {
+  const char *end = from;
+  while (*(end++))
+    ;
+  char *buf = get_block(end - from);
+  blockcpy(buf, from, end - from);
+  return buf;
 }
\ No newline at end of file