libs/libc/stdio: In the recent changes we lost the implementation of vsscanf(). This commit restores vsscanf(). sscanf() is not just a front end for vsscanf().

libs/libc/stdio/Make.defs

@@ -43,7 +43,8 @@ CSRCS += lib_vsnprintf.c lib_dprintf.c lib_vdprintf.c
 CSRCS += lib_meminstream.c lib_memoutstream.c lib_memsistream.c
 CSRCS += lib_memsostream.c lib_lowoutstream.c
 CSRCS += lib_zeroinstream.c lib_nullinstream.c lib_nulloutstream.c
-CSRCS += lib_sscanf.c lib_libsscanf.c lib_libnoflush.c lib_libsnoflush.c
+CSRCS += lib_sscanf.c lib_vsscanf.c lib_libsscanf.c lib_libnoflush.c
+CSRCS += lib_libsnoflush.c
 
 ifeq ($(CONFIG_NANO_PRINTF),y)
 

libs/libc/stdio/lib_fscanf.c

@@ -38,6 +38,8 @@
  ****************************************************************************/
 
 #include <stdio.h>
+#include <stdarg.h>
+#include "libc.h"
 
 /****************************************************************************
  * Public Functions
@@ -52,7 +54,7 @@ int fscanf(FAR FILE *stream, FAR const IPTR char *fmt, ...)
   va_list ap;
   int n;
 
-  /* vfprintf into the stream */
+  /* vscanf from the stream */
 
   va_start(ap, fmt);
   n = vfscanf(stream, fmt, ap);

libs/libc/stdio/lib_libsscanf.c

@@ -52,6 +52,8 @@
 #include <errno.h>
 #include <debug.h>
 
+#include <nuttx/streams.h>
+
 #include "libc.h"
 
 /****************************************************************************
@@ -74,17 +76,6 @@
 #  define MAX(a,b) (((a) > (b)) ? (a) : (b))
 #endif
 
-/****************************************************************************
- * Public Function Prototypes
- ****************************************************************************/
-
-int lib_vsscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
-                FAR const IPTR char *fmt, va_list ap);
-
-/****************************************************************************
- * Private Data
- ****************************************************************************/
-
 /****************************************************************************
  * Private Functions
  ****************************************************************************/

libs/libc/stdio/lib_sscanf.c

@@ -40,6 +40,7 @@
 
 #include <stdio.h>
 #include <stdarg.h>
+#include <nuttx/streams.h>
 #include "libc.h"
 
 /****************************************************************************
@@ -52,20 +53,14 @@
 
 int sscanf(FAR const char *buf, FAR const IPTR char *fmt, ...)
 {
-  struct lib_meminstream_s meminstream;
   va_list ap;
   int n;
 
-  /* Initialize a memory stream to write to the buffer */
-
-  lib_meminstream((FAR struct lib_meminstream_s *)&meminstream, buf,
-                  LIB_BUFLEN_UNKNOWN);
-
-  /* Then let lib_vsscanf do the real work */
+  /* vsscanf from the buffer */
 
   va_start(ap, fmt);
-  n = lib_vsscanf((FAR struct lib_instream_s *)&meminstream.public, NULL,
-                  fmt, ap);
+  n = vsscanf(buf, fmt, ap);
   va_end(ap);
+
   return n;
 }

libs/libc/stdio/lib_vfscanf.c

@@ -42,6 +42,8 @@
 #include <stdio.h>
 #include <semaphore.h>
 
+#include <nuttx/streams.h>
+
 #include "libc.h"
 
 /****************************************************************************