Added the POSIX functions opendir() and closedir().

git-svn-id: svn://svn.cc65.org/cc65/trunk@5666 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/cbm/opendir.c

@@ -0,0 +1,52 @@
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include "dir.h"
+
+
+
+DIR* __fastcall__ opendir (const char*)
+{
+    unsigned char buffer[8+16+1+7];
+    int count;
+    DIR d;
+    DIR* dir = 0;
+
+    /* Setup file name and offset */
+    d.name[0] = '$';
+    d.name[1] = '\0';
+    d.offs    = 0;
+
+    /* Open the directory on disk for reading */
+    d.fd = open (d.name, O_RDONLY);
+    if (d.fd >= 0) {
+
+        /* Skip the disk header */
+        count = read (d.fd, buffer, sizeof (buffer));
+        if (count == sizeof (buffer)) {
+
+            /* Allocate memory for the DIR structure returned */
+            dir = malloc (sizeof (*dir));
+
+            /* Copy the contents of d */
+            if (dir) {
+                memcpy (dir, &d, sizeof (d));
+            } else {
+                /* Set an appropriate error code */
+                errno = ENOMEM;
+            }
+        } else if (count >= 0) {
+            /* Short read - need to set an error code */
+            errno = EIO;
+        }
+    }
+
+    /* Done */
+    return dir;
+}
+
+
+