31631: Use cygwin_conv_path if available.

Prefer it to cygwin_conv_to_posix_path.

ChangeLog

@@ -1,3 +1,8 @@
+2013-08-05  Peter Stephenson  <p.w.stephenson@ntlworld.com>
+
+	* 31631: configure.ac, Src/builtin.c: use cygwin_conv_path in
+	preference to cygwin_conv_to_posix_path if available.
+
 2013-08-04  Peter Stephenson  <p.w.stephenson@ntlworld.com>
 
 	* Yuusuke Yoshimoto: 31632: Completion/Unix/Type/_java_class:

Src/builtin.c

@@ -939,11 +939,16 @@ cd_do_chdir(char *cnam, char *dest, int hard)
      * DOS style names with drives in them
      */
     static char buf[PATH_MAX];
+#ifdef HAVE_CYGWIN_CONV_PATH
+    cygwin_conv_path(CCP_WIN_A_TO_POSIX | CCP_RELATIVE, dest, buf,
+		     PATH_MAX);
+#else
 #ifndef _SYS_CYGWIN_H
     void cygwin_conv_to_posix_path(const char *, char *);
 #endif
 
     cygwin_conv_to_posix_path(dest, buf);
+#endif
     dest = buf;
 #endif
     nocdpath = dest[0] == '.' &&

configure.ac

@@ -1237,7 +1237,8 @@ AC_CHECK_FUNCS(strftime strptime mktime timelocal \
 	       regcomp regexec regerror regfree \
 	       gdbm_open getxattr \
 	       realpath canonicalize_file_name \
-	       symlink getcwd)
+	       symlink getcwd \
+	       cygwin_conv_path)
 AC_FUNC_STRCOLL
 
 if test x$enable_cap = xyes; then