Created student weenix repository

1 files changed, 72 insertions, 0 deletions

diff --git a/user/lib/ld-weenix/ldutil.c b/user/lib/ld-weenix/ldutil.c
new file mode 100644
index 0000000..b6509a3
--- /dev/null
+++ b/user/lib/ld-weenix/ldutil.c
@@ -0,0 +1,72 @@
+/*
+ *  File: ldutil.c
+ *  Date: 15 March 1998
+ *  Acct: David Powell (dep)
+ *  Desc: Functions that didn't fit anywhere else
+ *
+ *
+ *  Acct: Sandy Harvie (charvie)
+ *  Date: 27 March 2019
+ *  Desc: Modified for x86-64
+ */
+
+/* LINTLIBRARY */
+
+#include "fcntl.h"
+#include "stdio.h"
+#include "stdlib.h"
+#include "string.h"
+#include "unistd.h"
+
+#include "ldtypes.h"
+#include "ldutil.h"
+
+static const char *err_zero = "ld.so.1: panic - unable to open /dev/zero\n";
+
+/* I wrote this back before I had printf... maybe it should disappear. */
+
+void _ldverify(int test, const char *msg)
+{
+    if (test)
+    {
+        (void)write(STDERR_FILENO, msg, strlen(msg));
+        exit(LD_ERR_EXIT);
+    }
+}
+
+/* This function simply attempts to open /dev/zero, exiting if the call
+ * to open failed.  The file descriptor of the newly opened file is
+ * returned. */
+
+int _ldzero()
+{
+    int zfd;
+
+    if ((zfd = open("/dev/zero", O_RDONLY, 0)) < 0)
+    {
+        printf("%s", err_zero);
+        exit(1);
+    }
+
+    return zfd;
+}
+
+/* This is the hash operation used for the string-to-symbol hash
+ * table in dynamic ELF binaries.  This function is taken more or less
+ * directly from the LLM */
+
+unsigned long _ldelfhash(const char *name)
+{
+    uint32_t h = 0, g;
+
+    while (*name)
+    {
+        h = (h << 4) + *name++;
+        /* LINTED */
+        if ((g = h & 0xf0000000))
+            h ^= g >> 24;
+        h &= ~g;
+    }
+
+    return h;
+}