libs/libc/stdio/nano_libvsprintf.c: Add long long support. CONFIG_LIBC_LONG_LONG needs at least CONFIG_NANO_PRINTLEVEL 2. Code size for compile without CONFIG_LIBC_LONG_LONG shouldn't be affected.

libs/libc/stdio/Kconfig

@@ -118,7 +118,6 @@ config NANO_PRINTF
 	bool "Use nano printf code"
 	default y if DEFAULT_SMALL
 	default n if !DEFAULT_SMALL
-	depends on !LIBC_LONG_LONG
 	---help---
 		Replace printf code with version from newlib-nano. Can be
 		signifcantly smaller, especially if floating support is enabled.
@@ -128,8 +127,10 @@ config NANO_PRINTLEVEL
 	int "Nano printf support level"
 	default 2 if !LIBC_FLOATINGPOINT
 	default 3 if LIBC_FLOATINGPOINT
-	range 1 2 if !LIBC_FLOATINGPOINT
+	range 1 2 if !LIBC_FLOATINGPOINT && !LIBC_LONG_LONG
-	range 1 3 if LIBC_FLOATINGPOINT
+	range 1 3 if LIBC_FLOATINGPOINT && !LIBC_LONG_LONG
+	range 2 2 if !LIBC_FLOATINGPOINT && LIBC_LONG_LONG
+	range 2 3 if LIBC_FLOATINGPOINT && LIBC_LONG_LONG
 	depends on NANO_PRINTF
 	---help---
 		Nano printf can be built into more than one support level.  The

libs/libc/stdio/nano_libvsprintf.c

@@ -326,7 +326,11 @@ int lib_vsprintf(FAR struct lib_outstream_s *stream,
   int prec;
   union
   {
+#  ifdef CONFIG_LIBC_LONG_LONG
+    unsigned char __buf[22];  /* Size for -1 in octal, without '\0' */
+#  else
     unsigned char __buf[11];  /* Size for -1 in octal, without '\0' */
+#  endif
 #  if PRINTF_LEVEL >= PRINTF_FLT
     struct dtoa_s __dtoa;
 #  endif
@@ -833,8 +837,16 @@ int lib_vsprintf(FAR struct lib_outstream_s *stream,
       if (c == 'd' || c == 'i')
         {
           long x;
+#ifdef CONFIG_LIBC_LONG_LONG
+          long long x;
 
-          if (flags & FL_LONG)
+          if ((flags & FL_LONGLONG) != 0)
+            {
+              x = va_arg(ap, long long);
+            }
+          else
+#endif
+          if ((flags & FL_LONG) != 0)
             {
               x = va_arg(ap, long);
             }
@@ -865,10 +877,18 @@ int lib_vsprintf(FAR struct lib_outstream_s *stream,
         }
       else
         {
-          int base;
           unsigned long x;
+          int base;
+#ifdef CONFIG_LIBC_LONG_LONG
+          unsigned long long x;
 
-          if (flags & FL_LONG)
+          if (flags & FL_LONGLONG) != 0)
+            {
+              x = va_arg(ap, unsigned long long);
+            }
+          else
+#endif
+          if ((flags & FL_LONG) != 0)
             {
               x = va_arg(ap, unsigned long);
             }
@@ -921,7 +941,7 @@ int lib_vsprintf(FAR struct lib_outstream_s *stream,
             }
           else
             {
-            c = __ultoa_invert(x, (char *)buf, base) - (char *)buf;
+              c = __ultoa_invert(x, (char *)buf, base) - (char *)buf;
             }
 
           flags &= ~FL_NEGATIVE;

libs/libc/stdio/nano_ultoa_invert.c

@@ -43,7 +43,11 @@
  * Public Functions
  ****************************************************************************/
 
+#ifdef CONFIG_LIBC_LONG_LONG
+FAR char *__ultoa_invert(unsigned long long val, FAR char *str, int base)
+#else
 FAR char *__ultoa_invert(unsigned long val, FAR char *str, int base)
+#endif
 {
   int upper = 0;
 

libs/libc/stdio/nano_ultoa_invert.h

@@ -42,6 +42,8 @@
 
 #include <nuttx/compiler.h>
 
+#include <nuttx/config.h>
+
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
@@ -57,6 +59,10 @@
 
 /* Internal function for use from `printf'. */
 
-FAR char *__ultoa_invert(unsigned long val, FAR char *s, int base);
+#ifdef CONFIG_LIBC_LONG_LONG
+FAR char *__ultoa_invert(unsigned long long val, FAR char *str, int base);
+#else
+FAR char *__ultoa_invert(unsigned long val, FAR char *str, int base);
+#endif
 
 #endif /* __LIBS_LIBC_STDIO_NANO_ULTOA_INVERT_H */