8 files changed, 33 insertions, 23 deletions
diff --git a/newlib/libc/include/sys/lock.h b/newlib/libc/include/sys/lock.h
index 984bc5f80..c05814a2a 100644
--- a/newlib/libc/include/sys/lock.h
+++ b/newlib/libc/include/sys/lock.h
@@ -8,15 +8,15 @@ typedef int _LOCK_RECURSIVE_T;
 
 #define __LOCK_INIT(class,lock) static int lock = 0;
 #define __LOCK_INIT_RECURSIVE(class,lock) static int lock = 0;
-#define __lock_init(lock) {}
-#define __lock_init_recursive(lock) {}
-#define __lock_close(lock) {}
-#define __lock_close_recursive(lock) {}
-#define __lock_acquire(lock) {}
-#define __lock_acquire_recursive(lock) {}
-#define __lock_try_acquire(lock) {}
-#define __lock_try_acquire_recursive(lock) {}
-#define __lock_release(lock) {}
-#define __lock_release_recursive(lock) {}
+#define __lock_init(lock) (0)
+#define __lock_init_recursive(lock) (0)
+#define __lock_close(lock) (0)
+#define __lock_close_recursive(lock) (0)
+#define __lock_acquire(lock) (0)
+#define __lock_acquire_recursive(lock) (0)
+#define __lock_try_acquire(lock) (0)
+#define __lock_try_acquire_recursive(lock) (0)
+#define __lock_release(lock) (0)
+#define __lock_release_recursive(lock) (0)
 
 #endif /* __SYS_LOCK_H__ */
diff --git a/newlib/libc/include/sys/stdio.h b/newlib/libc/include/sys/stdio.h
index c0cf33893..fa9cd5d0a 100644
--- a/newlib/libc/include/sys/stdio.h
+++ b/newlib/libc/include/sys/stdio.h
@@ -5,10 +5,12 @@
 #include <sys/reent.h>
 
 /* Internal locking macros, used to protect stdio functions.  In the
-   general case, expand to nothing. */
+   general case, expand to nothing. Use __SSTR flag in FILE _flags to
+   detect if FILE is private to sprintf/sscanf class of functions; if
+   set then do nothing as lock is not initialised. */
 #if !defined(_flockfile)
 #ifndef __SINGLE_THREAD__
-#  define _flockfile(fp) __lock_acquire_recursive(fp->_lock)
+#  define _flockfile(fp) (((fp)->_flags & __SSTR) ? 0 : __lock_acquire_recursive((fp)->_lock))
 #else
 #  define _flockfile(fp)
 #endif
@@ -16,7 +18,7 @@
 
 #if !defined(_funlockfile)
 #ifndef __SINGLE_THREAD__
-#  define _funlockfile(fp) __lock_release_recursive(fp->_lock)
+#  define _funlockfile(fp) (((fp)->_flags & __SSTR) ? 0 : __lock_release_recursive((fp)->_lock))
 #else
 #  define _funlockfile(fp)
 #endif
diff --git a/newlib/libc/stdio/local.h b/newlib/libc/stdio/local.h
index e3d5da573..e62f3418d 100644
--- a/newlib/libc/stdio/local.h
+++ b/newlib/libc/stdio/local.h
@@ -48,11 +48,11 @@ extern int   _EXFUN(__srefill,(FILE *fp));
 /* Called by the main entry point fns to ensure stdio has been initialized.  */
 
 #define CHECK_INIT(fp) \
-  do					\
-    {					\
-      if (!_REENT->__sdidinit)		\
-	__sinit (_REENT);		\
-    }					\
+  do						\
+    {						\
+      if (_REENT && !_REENT->__sdidinit)	\
+	__sinit (_REENT);			\
+    }						\
   while (0)
 
 /* Return true iff the given FILE cannot be written now.  */
diff --git a/newlib/libc/stdio/siprintf.c b/newlib/libc/stdio/siprintf.c
index 95ff8084f..838200805 100644
--- a/newlib/libc/stdio/siprintf.c
+++ b/newlib/libc/stdio/siprintf.c
@@ -85,6 +85,7 @@ siprintf(str, fmt, va_alist)
   f._flags = __SWR | __SSTR;
   f._bf._base = f._p = (unsigned char *) str;
   f._bf._size = f._w = INT_MAX;
+  f._file = -1;  /* No file. */
 #ifdef _HAVE_STDC
   va_start (ap, fmt);
 #else
@@ -119,6 +120,7 @@ _siprintf_r(rptr, str, fmt, va_alist)
   f._flags = __SWR | __SSTR;
   f._bf._base = f._p = (unsigned char *) str;
   f._bf._size = f._w = INT_MAX;
+  f._file = -1;  /* No file. */
 #ifdef _HAVE_STDC
   va_start (ap, fmt);
 #else
diff --git a/newlib/libc/stdio/snprintf.c b/newlib/libc/stdio/snprintf.c
index fc818d2e9..9c5c7cbb4 100644
--- a/newlib/libc/stdio/snprintf.c
+++ b/newlib/libc/stdio/snprintf.c
@@ -51,6 +51,7 @@ _snprintf_r(ptr, str, size, fmt, va_alist)
   f._flags = __SWR | __SSTR;
   f._bf._base = f._p = (unsigned char *) str;
   f._bf._size = f._w = (size > 0 ? size - 1 : 0);
+  f._file = -1;  /* No file. */
 #ifdef _HAVE_STDC
   va_start (ap, fmt);
 #else
@@ -86,6 +87,7 @@ snprintf(str, size, fmt, va_alist)
   f._flags = __SWR | __SSTR;
   f._bf._base = f._p = (unsigned char *) str;
   f._bf._size = f._w = (size > 0 ? size - 1 : 0);
+  f._file = -1;  /* No file. */
 #ifdef _HAVE_STDC
   va_start (ap, fmt);
 #else
diff --git a/newlib/libc/stdio/sscanf.c b/newlib/libc/stdio/sscanf.c
index 1aca40507..687f53edf 100644
--- a/newlib/libc/stdio/sscanf.c
+++ b/newlib/libc/stdio/sscanf.c
@@ -402,12 +402,13 @@ sscanf(str, fmt, va_alist)
   va_list ap;
   FILE f;
 
-  f._flags = __SRD;
+  f._flags = __SRD | __SSTR;
   f._bf._base = f._p = (unsigned char *) str;
   f._bf._size = f._r = strlen (str);
   f._read = eofread;
   f._ub._base = NULL;
   f._lb._base = NULL;
+  f._file = -1;  /* No file. */
 #ifdef _HAVE_STDC
   va_start (ap, fmt);
 #else
@@ -439,12 +440,13 @@ _sscanf_r(ptr, str, fmt, va_alist)
   va_list ap;
   FILE f;
 
-  f._flags = __SRD;
+  f._flags = __SRD | __SSTR;
   f._bf._base = f._p = (unsigned char *) str;
   f._bf._size = f._r = strlen (str);
   f._read = eofread;
   f._ub._base = NULL;
   f._lb._base = NULL;
+  f._file = -1;  /* No file. */
 #ifdef _HAVE_STDC
   va_start (ap, fmt);
 #else
diff --git a/newlib/libc/stdio/vsnprintf.c b/newlib/libc/stdio/vsnprintf.c
index fb80f4192..9fc1b2d89 100644
--- a/newlib/libc/stdio/vsnprintf.c
+++ b/newlib/libc/stdio/vsnprintf.c
@@ -45,6 +45,7 @@ _DEFUN(vsnprintf, (str, size, fmt, ap),
   f._flags = __SWR | __SSTR;
   f._bf._base = f._p = (unsigned char *) str;
   f._bf._size = f._w = (size > 0 ? size - 1 : 0);
+  f._file = -1;  /* No file. */
   ret = _vfprintf_r (_REENT, &f, fmt, ap);
   if (size > 0)
     *f._p = 0;
@@ -67,6 +68,7 @@ _DEFUN(_vsnprintf_r, (ptr, str, size, fmt, ap),
   f._flags = __SWR | __SSTR;
   f._bf._base = f._p = (unsigned char *) str;
   f._bf._size = f._w = (size > 0 ? size - 1 : 0);
+  f._file = -1;  /* No file. */
   ret = _vfprintf_r (ptr, &f, fmt, ap);
   if (size > 0)
     *f._p = 0;
diff --git a/newlib/libc/stdio/vsscanf.c b/newlib/libc/stdio/vsscanf.c
index c6237112c..22ed9cdf7 100644
--- a/newlib/libc/stdio/vsscanf.c
+++ b/newlib/libc/stdio/vsscanf.c
@@ -63,12 +63,12 @@ _DEFUN(_vsscanf_r, (ptr, str, fmt, ap),
 {
   FILE f;
 
-  f._flags = __SRD;
+  f._flags = __SRD | __SSTR;
   f._bf._base = f._p = (unsigned char *) str;
   f._bf._size = f._r = strlen (str);
   f._read = eofread1;
   f._ub._base = NULL;
   f._lb._base = NULL;
-  return __svfscanf_r (ptr, &f, fmt, ap);    
+  f._file = -1;  /* No file. */
+  return __svfscanf_r (ptr, &f, fmt, ap);
 }
-