From f57e2eabe0a10c9732c83532e01654a499fb8dcf Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Mon, 21 Jun 2021 17:47:13 -0400
Subject: many, many changes; settings is broken

---
 src/user/knob/block.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

(limited to 'src/user/knob/block.c')

diff --git a/src/user/knob/block.c b/src/user/knob/block.c
index 9f3f353..8b9971f 100644
--- a/src/user/knob/block.c
+++ b/src/user/knob/block.c
@@ -1,4 +1,5 @@
 #include <knob/panic.h>
+#include <knob/block.h>
 #include <knob/heap.h>
 #include <stdbool.h>
 #include <stdint.h>
@@ -28,13 +29,22 @@ uint32_t strcpy(char *to, const char *from) {
 }
 
 char *strdup(const char *from) {
-  const char *end = from;
-  while (*(end++))
-    ;
-  char *buf = get_block(end - from);
-  if (!buf)
-    PANIC("get_block returned 0 in strdup");
-  blockcpy(buf, from, end - from);
+  const uint32_t len = strlen(from) + 1;
+  char *buf = get_block(len);
+  blockcpy(buf, from, len);
+  return buf;
+}
+
+char *strndup(const char *from, uint32_t n) {
+  uint32_t len = strlen(from) + 1;
+  if (n < len) {
+    char *buf = get_block(n + 1);
+    blockcpy(buf, from, n);
+    buf[n] = '\0';
+    return buf;
+  }
+  char *buf = get_block(len);
+  blockcpy(buf, from, len);
   return buf;
 }
 
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