libs/libc/stdio: Remove unused, non-standard functions lib_sscanf() and lib_sprintf().

libs/libc/stdio/Make.defs

@@ -34,16 +34,15 @@
 ############################################################################
 
 # Add the stdio C files to the build
-# This first group of C files do not depend on having file descriptors or
-# C streams.
+# This first group of C files do not depend on having C streams.
 
 CSRCS += lib_fileno.c lib_printf.c lib_sprintf.c lib_asprintf.c
-CSRCS += lib_snprintf.c lib_libsprintf.c lib_vsprintf.c lib_vasprintf.c
-CSRCS += lib_vsnprintf.c lib_dprintf.c lib_vdprintf.c
+CSRCS += lib_snprintf.c lib_vsprintf.c lib_vasprintf.c lib_vsnprintf.c
+CSRCS += 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_vsscanf.c lib_libsscanf.c lib_libnoflush.c
+CSRCS += lib_sscanf.c lib_vsscanf.c lib_libvscanf.c lib_libnoflush.c
 CSRCS += lib_libsnoflush.c
 
 ifeq ($(CONFIG_NANO_PRINTF),y)
@@ -62,12 +61,7 @@ CSRCS += lib_libvsprintf.c
 
 endif
 
-# The remaining sources files depend upon file descriptors
-
-CSRCS += lib_rawinstream.c lib_rawoutstream.c lib_rawsistream.c
-CSRCS += lib_rawsostream.c lib_remove.c
-
-# And these depend upon both file descriptors and C streams
+# The remaining sources files depend upon C streams
 
 ifneq ($(CONFIG_NFILE_STREAMS),0)
 
@@ -79,7 +73,9 @@ CSRCS += lib_rdflush.c lib_wrflush.c lib_fputc.c lib_puts.c lib_fputs.c
 CSRCS += lib_ungetc.c lib_vprintf.c lib_fprintf.c lib_vfprintf.c
 CSRCS += lib_stdinstream.c lib_stdoutstream.c lib_stdsistream.c
 CSRCS += lib_stdsostream.c lib_perror.c lib_feof.c lib_ferror.c
-CSRCS += lib_clearerr.c lib_scanf.c lib_fscanf.c lib_vfscanf.c
+CSRCS += lib_rawinstream.c lib_rawoutstream.c lib_rawsistream.c
+CSRCS += lib_rawsostream.c lib_remove.c lib_clearerr.c lib_scanf.c
+CSRCS += lib_fscanf.c lib_vfscanf.c
 
 endif
 

libs/libc/stdio/lib_libvscanf.c

@@ -200,34 +200,15 @@ doexit:
  ****************************************************************************/
 
 /****************************************************************************
- * Name:  lib_sscanf
- *
- * Description:
- *    Stream-oriented version of sscanf.
- *
- ****************************************************************************/
-
-int lib_sscanf(FAR struct lib_instream_s *obj, FAR const IPTR char *fmt, ...)
-{
-  va_list ap;
-  int count;
-
-  va_start(ap, fmt);
-  count = lib_vsscanf(obj, NULL, fmt, ap);
-  va_end(ap);
-  return count;
-}
-
-/****************************************************************************
- * Name:  lib_vsscanf
+ * Name:  lib_vscanf
  *
  * Description:
  *    Stream-oriented version of vsscanf.
  *
  ****************************************************************************/
 
-int lib_vsscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
-                FAR const IPTR char *fmt, va_list ap)
+int lib_vscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
+               FAR const IPTR char *fmt, va_list ap)
 {
   int c;
   FAR char *tv;

libs/libc/stdio/lib_vfscanf.c

@@ -58,20 +58,20 @@ int vfscanf(FAR FILE *stream, FAR const IPTR char *fmt, va_list ap)
 
   if (stream)
     {
-      /* Wrap the stream in a stream object and let lib_vsscanf do the work. */
+      /* Wrap the stream in a stream object and let lib_vscanf do the work. */
 
       lib_stdinstream(&stdinstream, stream);
 
-      /* Hold the stream semaphore throughout the lib_vsscanf call so that
+      /* Hold the stream semaphore throughout the lib_vscanf call so that
        * this thread can get its entire message out before being pre-empted by
        * the next thread.
        */
 
       lib_take_semaphore(stream);
 
-      n = lib_vsscanf(&stdinstream.public, &lastc, fmt, ap);
+      n = lib_vscanf(&stdinstream.public, &lastc, fmt, ap);
 
-      /* The lib_vsscanf function reads always one character more, this
+      /* The lib_vscanf function reads always one character more, this
        * character needs to be written back.
        */
 

libs/libc/stdio/lib_vsscanf.c

@@ -1,8 +1,8 @@
 /****************************************************************************
- * libs/libc/stdio/lib_libsprintf.c
+ * libs/libc/stdio/lib_vscanf.c
  *
- *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *   Copyright (C) 2019 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@gnutt.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -37,27 +37,33 @@
  * Included Files
  ****************************************************************************/
 
+#include <nuttx/config.h>
+
 #include <stdio.h>
+#include <semaphore.h>
+
+#include <nuttx/streams.h>
+
 #include "libc.h"
 
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
 
-/****************************************************************************
- * Name: lib_sprintf
- ****************************************************************************/
-
-int lib_sprintf(FAR struct lib_outstream_s *obj, FAR const IPTR char *fmt,
-                ...)
+int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
 {
-  va_list ap;
-  int     n;
+  struct lib_meminstream_s meminstream;
+  int n;
 
-  /* Let lib_vsprintf do the real work */
+  /* Initialize a memory stream to freadm from the buffer */
 
-  va_start(ap, fmt);
-  n = lib_vsprintf(obj, fmt, ap);
-  va_end(ap);
+  lib_meminstream((FAR struct lib_meminstream_s *)&meminstream, buf,
+                  LIB_BUFLEN_UNKNOWN);
+
+  /* Then let lib_vscanf do the real work */
+
+
+  n = lib_vscanf((FAR struct lib_instream_s *)&meminstream.public, NULL,
+                  fmt, ap);
   return n;
 }