cpukit: Add libdl with the Runtime Loader (RTL) code.

This is a merge of the RTL project.

cpukit/libdl/rtl-find-file.c

@@ -0,0 +1,110 @@
+/*
+ *  COPYRIGHT (c) 2012-2013 Chris Johns <chrisj@rtems.org>
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ */
+/**
+ * @file
+ *
+ * @ingroup rtl
+ *
+ * @brief RTEMS Run-Time Linker Error
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <rtems/libio_.h>
+
+#include <rtems/rtl/rtl.h>
+#include "rtl-find-file.h"
+#include "rtl-error.h"
+#include "rtl-string.h"
+#include "rtl-trace.h"
+
+#if WAF_BUILD
+#define rtems_filesystem_is_delimiter rtems_filesystem_is_separator
+#endif
+
+bool
+rtems_rtl_find_file (const char*  name,
+                     const char*  paths,
+                     const char** file_name,
+                     size_t*      size)
+{
+  struct stat sb;
+
+  *file_name = NULL;
+  *size = 0;
+
+  if (rtems_filesystem_is_delimiter (name[0]) || (name[0] == '.'))
+  {
+    if (stat (name, &sb) == 0)
+      *file_name = rtems_rtl_strdup (name);
+  }
+  else if (paths)
+  {
+    const char* start;
+    const char* end;
+    int         len;
+    char*       fname;
+
+    start = paths;
+    end = start + strlen (paths);
+    len = strlen (name);
+
+    while (!*file_name && (start != end))
+    {
+      const char* delimiter = strchr (start, ':');
+
+      if (delimiter == NULL)
+        delimiter = end;
+
+      /*
+       * Allocate the path fragment, separator, name, terminating nul. Form the
+       * path then see if the stat call works.
+       */
+
+      fname = rtems_rtl_alloc_new (RTEMS_RTL_ALLOC_OBJECT,
+                                   (delimiter - start) + 1 + len + 1, true);
+      if (!fname)
+      {
+        rtems_rtl_set_error (ENOMEM, "no memory searching for file");
+        return false;
+      }
+
+      memcpy (fname, start, delimiter - start);
+      fname[delimiter - start] = '/';
+      memcpy (fname + (delimiter - start) + 1, name, len);
+
+      if (rtems_rtl_trace (RTEMS_RTL_TRACE_LOAD))
+        printf ("rtl: find-file: path: %s\n", fname);
+
+      if (stat (fname, &sb) < 0)
+        rtems_rtl_alloc_del (RTEMS_RTL_ALLOC_OBJECT, fname);
+      else
+        *file_name = fname;
+
+      start = delimiter;
+      if (start != end)
+        ++start;
+    }
+  }
+
+  if (!*file_name)
+    return false;
+
+  *size = sb.st_size;
+
+  return true;
+}