libc: Add canonicalize_file_name function

Add canonicalize_file_name function and its related tests.
Required by elfutils and coreutils (readlink).

Signed-off-by: Salvatore Cro <salvatore.cro@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/libc/stdlib/canonicalize.c b/libc/stdlib/canonicalize.c
new file mode 100644
index 000000000..06e710ab7
--- /dev/null
+++ b/libc/stdlib/canonicalize.c
@@ -0,0 +1,38 @@
+/*
+ * canonicalize.c -- Return a malloc'd string containing the canonical
+ * absolute name of the named file.  The last file name component need
+ * not exist, and may be a symlink to a nonexistent file.
+ * Copyright (C) 2009 STMicroelectronics
+ * Author: Salvatore Cro <salvatore.cro@st.com>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <stdlib.h>
+#include <limits.h>
+
+#ifdef __USE_GNU
+
+#ifndef PATH_MAX
+# ifdef _POSIX_VERSION
+#  define PATH_MAX _POSIX_PATH_MAX
+# else
+#  ifdef MAXPATHLEN
+#   define PATH_MAX MAXPATHLEN
+#  else
+#   define PATH_MAX 1024
+#  endif
+# endif
+#endif
+
+char * canonicalize_file_name (const char *name)
+{
+	char *buf = (char *) malloc(PATH_MAX);
+
+	if(unlikely(buf == NULL))
+		return NULL;
+
+	*buf='\0';
+	return realpath (name, buf);
+}
+#endif