Emulate `readlink' for DJGPP versions before 2.04.

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

3 files changed, 23 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index b49b7a2d3f1..3288a79e9c6 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +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.
+
 2011-02-26  Eli Zaretskii  <eliz@gnu.org>
 
         * s/msdos.h (HAVE_LSTAT): Define for DJGPP >= 2.04.
diff --git a/src/msdos.c b/src/msdos.c
index 8f0f6776aaa..f6ac1d32b9b 100644
--- a/src/msdos.c
+++ b/src/msdos.c
@@ -3922,6 +3922,18 @@ 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.  */