Implement stub emulation of `readlink' for MS-DOS.

 src/msdos.c (readlink) [DJGPP < 2.04]: New stub function.
 src/msdos.h: (readlink) [DJGPP < 2.04]: Declare prototype.

3 files changed, 21 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index f3710495c4a..a7c9d4c7e3c 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,9 @@
 2011-02-27  Eli Zaretskii  <eliz@gnu.org>
 
+        * msdos.c (readlink) [DJGPP < 2.04]: New stub function.
+
+        * msdos.h: (readlink) [DJGPP < 2.04]: Declare prototype.
+
         * w32.c (symlink, readlink): New stub functions.
 
 2011-02-27  Paul Eggert  <eggert@cs.ucla.edu>
diff --git a/src/msdos.c b/src/msdos.c
index df51c5fdb88..261a09ac859 100644
--- a/src/msdos.c
+++ b/src/msdos.c
@@ -3920,6 +3920,18 @@ croak (char *badfunc)
  */
 int setpgrp (void) {return 0; }
 int setpriority (int x, int y, int z) { return 0; }
+
+#if __DJGPP__ == 2 && __DJGPP_MINOR__ < 4
+ssize_t
+readlink (const char *name, char *dummy1, size_t dummy2)
+{
+  /* `access' is much faster than `stat' on MS-DOS.  */
+  if (access (name, F_OK) == 0)
+    errno = EINVAL;
+  return -1;
+}
+#endif
+
 
 #if __DJGPP__ == 2 && __DJGPP_MINOR__ < 2
 
diff --git a/src/msdos.h b/src/msdos.h
index 6b076c1722b..4bbe9b134de 100644
--- a/src/msdos.h
+++ b/src/msdos.h
@@ -40,6 +40,11 @@ void mouse_init (void);
 void mouse_on (void);
 void mouse_off (void);
 void mouse_moveto (int, int);
+
+#if __DJGPP__ == 2 && __DJGPP_MINOR__ < 4
+int readlink (const char *, char *, size_t);
+#endif
+
 
 #ifndef HAVE_X_WINDOWS
 /* Dummy types.  */