Add support for Fire STM32v3; sscanf fixes from Kate

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5168 42af7a65-404d-4744-a932-0658087f49c3

10 files changed, 205 insertions, 62 deletions

diff --git a/apps/netutils/webserver/Kconfig b/apps/netutils/webserver/Kconfig
index 78b0ff12c..edca8dfdd 100644
--- a/apps/netutils/webserver/Kconfig
+++ b/apps/netutils/webserver/Kconfig
@@ -6,6 +6,7 @@
 config NETUTILS_WEBSERVER
 	bool "uIP web server"
 	default n
+	depends on NET_TCP
 	---help---
 		Enable support for the uIP web server.  This tiny web server was
 		from uIP 1.0, but has undergone many changes.  It is, however,
@@ -74,10 +75,11 @@ config NETUTILS_HTTPD_SERVERHEADER_DISABLE
 config NETUTILS_HTTPD_TIMEOUT
 	int "Receive Timeout (sec)"
 	default 0
+	depends on NET_SOCKOPTS
 	---help---
 		Receive timeout setting (in seconds).  A timeout value of zero
 		disables the timeout.  An HTTP 408 error is generated if the timeout
-		expires.
+		expires.  This option depends on support for socket options (sockopts).
 
 choice
 	prompt "File Transfer Method"
diff --git a/nuttx/ChangeLog b/nuttx/ChangeLog
index 7ad830d89..42110fd79 100644
--- a/nuttx/ChangeLog
+++ b/nuttx/ChangeLog
@@ -3377,3 +3377,12 @@
 	  commands used in the build (Contributed by Richard Cochran).
 	* drivers/net/enc28j60.c:  The ENC28J60 Ethernet driver is
 	  now functional.
+	* configs/fire-stm32v2:  Add support or the fire-stm32v3 board as
+	  well (untested because I do not have a v3 board).
+	* lib/stdio/lib_sscanf.c:  Add %n psuedo-format (from Kate).
+	* lib/stdio/lib_sscanf.c:  There is an issue of handling input
+	  when (1) no fieldwidth is provided and (2) there is no space
+	  seperating the input values.  No solutions is in place for this
+	  case now (either space or a fieldwidth must be provided).  But
+	  at least some of the bad logic that attempted to handle this
+	  case has been removed (noted by Kate).
diff --git a/nuttx/Documentation/NuttX.html b/nuttx/Documentation/NuttX.html
index 6b120f4e2..b51b5e7b3 100644
--- a/nuttx/Documentation/NuttX.html
+++ b/nuttx/Documentation/NuttX.html
@@ -1753,7 +1753,7 @@
         STM32F103VCT chip.  Contributed by Laurent Latil.
       </li>
       <li>
-         This M3 Wildfire development board (STM32F103VET6), version 2.
+         The M3 Wildfire development board (STM32F103VET6), version 2.
          See <a href="http://firestm32.taobao.com">http://firestm32.taobao.com</a> (the current board is version 3).
       </li>
     </ol>
@@ -1787,7 +1787,9 @@
           Support for the Wildfire board was included in version 6.22 of NuttX.
           The board port is basically functional.
           Not all features have been verified.
-          The ENC28J60 network is not yet functional.
+          Support for FAT file system on an an SD card had been verified.
+          The ENC28J60 network is functional (but required lifting the chip select pin on the W25x16 part).
+          Customizations for the v3 version of the Wildfire board a selectable (but untested).
         </li>
       </ul>
       <p>
diff --git a/nuttx/configs/Kconfig b/nuttx/configs/Kconfig
index 12cc41ea7..752a5b098 100644
--- a/nuttx/configs/Kconfig
+++ b/nuttx/configs/Kconfig
@@ -130,8 +130,8 @@ config ARCH_BOARD_EZ80F910200ZCO
 		development kit, eZ80F091 part, and the Zilog ZDS-II Windows command line
 		tools.  The development environment is Cygwin under WinXP.
 
-config ARCH_BOARD_FIRE_STM32V2
-	bool "M3 Wildfire STM32v2 board"
+config ARCH_BOARD_FIRE_STM32
+	bool "M3 Wildfire STM3 board (v2 or v3)"
 	depends on ARCH_CHIP_STM32F103VET6
 	select ARCH_HAVE_LEDS
 	select ARCH_HAVE_BUTTONS
@@ -607,7 +607,7 @@ config ARCH_BOARD
 	default "ekk-lm3s9b96"       if ARCH_BOARD_EKK_LM3S9B96
 	default "ez80f0910200kitg"   if ARCH_BOARD_EZ80F910200KITG
 	default "ez80f0910200zco"    if ARCH_BOARD_EZ80F910200ZCO
-	default "fire-stm32v2"       if ARCH_BOARD_FIRE_STM32V2
+	default "fire-stm32v2"       if ARCH_BOARD_FIRE_STM32
 	default "hymini-stm32v"      if ARCH_BOARD_HYMINI_STM32V
 	default "kwikstik-k40"       if ARCH_BOARD_KWIKSTIK_K40
 	default "lincoln60"          if ARCH_BOARD_LINCOLN60
@@ -747,7 +747,7 @@ endif
 if ARCH_BOARD_EZ80F910200ZCO
 source "configs/ez80f910200zco/Kconfig"
 endif
-if ARCH_BOARD_FIRE_STM32V2
+if ARCH_BOARD_FIRE_STM32
 source "configs/fire-stm32v2/Kconfig"
 endif
 if ARCH_BOARD_HYMINI_STM32V
diff --git a/nuttx/configs/README.txt b/nuttx/configs/README.txt
index b5ada6ee5..5bbec874f 100644
--- a/nuttx/configs/README.txt
+++ b/nuttx/configs/README.txt
@@ -1570,7 +1570,8 @@ configs/ez80f0910200zco
 
 configs/fire-stm32v2
   A configuration for the M3 Wildfire STM32 board.  This board is based on the
-  STM32F103VET6 chip.  See http://firestm32.taobao.com
+  STM32F103VET6 chip.  See http://firestm32.taobao.com .  Version 2 and 3 of
+  the boards are supported but only version 2 has been tested.
 
 configs/hymini-stm32v
   A configuration for the HY-Mini STM32v board.  This board is based on the
diff --git a/nuttx/configs/fire-stm32v2/Kconfig b/nuttx/configs/fire-stm32v2/Kconfig
index 3f4b857da..4249a3dbd 100644
--- a/nuttx/configs/fire-stm32v2/Kconfig
+++ b/nuttx/configs/fire-stm32v2/Kconfig
@@ -4,3 +4,25 @@
 #
 
 comment "M3 Wildfire Configuration"
+
+if ARCH_BOARD_FIRE_STM32
+
+choice
+	prompt "Select Wildfire STM32 version"
+	default ARCH_BOARD_FIRE_STM32V2
+	---help---
+		This port has logic differences to support either the Version 2 or 
+		Version 3 of the Wildfire board.
+
+config ARCH_BOARD_FIRE_STM32V2
+	bool "Wildfire STM32v2"
+	---help---
+		Selects the M3 Wildfire version 2.
+
+config ARCH_BOARD_FIRE_STM32V3
+	bool "Wildfire STM32v3"
+	---help---
+		Selects the M3 Wildfire version 3.
+
+endchoice
+endif
diff --git a/nuttx/configs/fire-stm32v2/README.txt b/nuttx/configs/fire-stm32v2/README.txt
index d9a4d14ca..6382a7363 100644
--- a/nuttx/configs/fire-stm32v2/README.txt
+++ b/nuttx/configs/fire-stm32v2/README.txt
@@ -4,6 +4,10 @@ README
 This README discusses issues unique to NuttX configurations for the M3
 Wildfire development board (STM32F103VET6).  See http://firestm32.taobao.com
 
+This configuration should support both the version 2 and version 3 of the
+Wildfire board (using NuttX configuration options).  However, only version 2
+has been verified.
+
 Contents
 ========
 
@@ -27,8 +31,10 @@ PIN NAME   SIGNAL         NOTES
 
 1   PE2    PE2-C-RCLK     Camera (P9)
 2   PE3    PE3-USB-M      USB2.0
-3   PE4    PE4-BEEP       LS1 Bell
-4   PE5    (no name)      10Mbps ENC28J60 Interrupt
+3   PE4    PE4-BEEP       LS1 Bell (v2)
+           PE4            10Mbps ENC28J60 Interrupt (v3)
+4   PE5    (no name)      10Mbps ENC28J60 Interrupt (v2)
+           PE5            KEY1, Low when closed (pulled high if open) (v3)
 5   PE6
 6   VBAT   BT1            Battery (BT1)
 7   PC13                  Header 7X2
@@ -64,7 +70,8 @@ PIN NAME   SIGNAL         NOTES
 32  PA7    PA7-SPI1-MOSI  2.4" TFT + Touchscreen, 10Mbit ENC28J60, SPI 2M FLASH
 33  PC4    PC4-LED2       LED2, Active low (pulled high)
 34  PC5    PC5-LED3       LED3, Active low (pulled high)
-35  PB0    PB0-KEY1       KEY1, Low when closed (pulled high if open)
+35  PB0    PB0-KEY1       KEY1, Low when closed (pulled high if open) (v2)
+           PB0            Header P5 (v3)
 36  PB1    PB1-KEY2       KEY2, Low when closed (pulled high if open)
 37  PB2    BOOT1/DGND
 38  PE7    PE7-FSMC_D4    2.4" TFT + Touchscreen
@@ -525,7 +532,8 @@ M3 Wildfire-specific Configuration Options
 
     CONFIG_ARCH_BOARD_name - For use in C code
 
-       CONFIG_ARCH_BOARD_FIRE_STM32V2=y
+       CONFIG_ARCH_BOARD_FIRE_STM32V2=y  (Version 2)
+       CONFIG_ARCH_BOARD_FIRE_STM32V3=y  (Version 3)
 
     CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation
        of delay loops
diff --git a/nuttx/configs/fire-stm32v2/nsh/defconfig b/nuttx/configs/fire-stm32v2/nsh/defconfig
index fd5187801..0802af3c9 100644
--- a/nuttx/configs/fire-stm32v2/nsh/defconfig
+++ b/nuttx/configs/fire-stm32v2/nsh/defconfig
@@ -150,6 +150,7 @@ CONFIG_STM32_USART2=y
 CONFIG_STM32_USB=y
 # CONFIG_STM32_WWDG is not set
 CONFIG_STM32_SPI=y
+CONFIG_STM32_I2C=y
 
 #
 # Alternate Pin Mapping
@@ -172,6 +173,15 @@ CONFIG_STM32_JTAG_FULL_ENABLE=y
 # CONFIG_STM32_SPI_DMA is not set
 
 #
+# I2C Configuration
+#
+# CONFIG_STM32_I2C_DYNTIMEO is not set
+CONFIG_STM32_I2CTIMEOSEC=0
+CONFIG_STM32_I2CTIMEOMS=500
+CONFIG_STM32_I2CTIMEOTICKS=500
+# CONFIG_STM32_I2C_DUTY16_9 is not set
+
+#
 # SDIO Configuration
 #
 CONFIG_SDIO_DMA=y
@@ -215,7 +225,7 @@ CONFIG_BOOT_RUNFROMFLASH=y
 #
 # Board Selection
 #
-CONFIG_ARCH_BOARD_FIRE_STM32V2=y
+CONFIG_ARCH_BOARD_FIRE_STM32=y
 # CONFIG_ARCH_BOARD_CUSTOM is not set
 CONFIG_ARCH_BOARD="fire-stm32v2"
 
@@ -238,6 +248,8 @@ CONFIG_NSH_MMCSDSPIPORTNO=0
 #
 # M3 Wildfire Configuration
 #
+CONFIG_ARCH_BOARD_FIRE_STM32V2=y
+# CONFIG_ARCH_BOARD_FIRE_STM32V3 is not set
 
 #
 # RTOS Features
@@ -316,6 +328,8 @@ CONFIG_I2C_TRANSFER=y
 # CONFIG_I2C_WRITEREAD is not set
 CONFIG_I2C_POLLED=y
 # CONFIG_I2C_TRACE is not set
+CONFIG_ARCH_HAVE_I2CRESET=y
+# CONFIG_I2C_RESET is not set
 CONFIG_SPI=y
 # CONFIG_SPI_OWNBUS is not set
 CONFIG_SPI_EXCHANGE=y
@@ -348,6 +362,7 @@ CONFIG_ENC28J60_SPIMODE=0
 CONFIG_ENC28J60_FREQUENCY=20000000
 # CONFIG_ENC28J60_STATS is not set
 # CONFIG_ENC28J60_HALFDUPPLEX is not set
+# CONFIG_ENC28J60_DUMPPACKET is not set
 # CONFIG_NET_E1000 is not set
 # CONFIG_NET_SLIP is not set
 # CONFIG_NET_VNET is not set
diff --git a/nuttx/configs/fire-stm32v2/src/fire-internal.h b/nuttx/configs/fire-stm32v2/src/fire-internal.h
index e9f7a8508..7ab78a08f 100644
--- a/nuttx/configs/fire-stm32v2/src/fire-internal.h
+++ b/nuttx/configs/fire-stm32v2/src/fire-internal.h
@@ -166,7 +166,8 @@
  * PIN NAME   SIGNAL         NOTES
  * --- ------ -------------- -------------------------------------------------------------------
  *
- * 35  PB0    PB0-KEY1       KEY1, Low when closed (pulled high if open)
+ * 35  PB0    PB0-KEY1       KEY1, Low when closed (pulled high if open) (v2)
+ * 35  PE5    PB0            KEY1, Low when closed (pulled high if open) (v3)
  * 36  PB1    PB1-KEY2       KEY2, Low when closed (pulled high if open)
  */
 
@@ -174,8 +175,13 @@
 #define MAX_IRQBUTTON   BUTTON_KEY2
 #define NUM_IRQBUTTONS  (MAX_IRQBUTTON - MIN_IRQBUTTON + 1)
 
-#define GPIO_BTN_KEY1   (GPIO_INPUT|GPIO_CNF_INFLOAT|GPIO_MODE_INPUT|\
+#ifdef CONFIG_ARCH_BOARD_FIRE_STM32V3
+#  define GPIO_BTN_KEY1 (GPIO_INPUT|GPIO_CNF_INFLOAT|GPIO_MODE_INPUT|\
+                         GPIO_EXTI|GPIO_PORTE|GPIO_PIN5)
+#else
+#  define GPIO_BTN_KEY1 (GPIO_INPUT|GPIO_CNF_INFLOAT|GPIO_MODE_INPUT|\
                          GPIO_EXTI|GPIO_PORTB|GPIO_PIN0)
+#endif
 #define GPIO_BTN_KEY2   (GPIO_INPUT|GPIO_CNF_INFLOAT|GPIO_MODE_INPUT|\
                          GPIO_EXTI|GPIO_PORTB|GPIO_PIN1)
 
@@ -207,7 +213,8 @@
  * 31  PA6    PA6-SPI1-MISO  2.4" TFT + Touchscreen, 10Mbit ENC28J60, SPI 2M FLASH
  * 32  PA7    PA7-SPI1-MOSI  2.4" TFT + Touchscreen, 10Mbit ENC28J60, SPI 2M FLASH
  * 98  PE1    PE1-FSMC_NBL1  2.4" TFT + Touchscreen, 10Mbit EN28J60 Reset
- * 4   PE5    (no name)      10Mbps ENC28J60 Interrupt
+ * 4   PE5    (no name)      10Mbps ENC28J60 Interrupt (v2)
+ * 4   PE4    PE4            10Mbps ENC28J60 Interrupt (v3)
  */
 
 #if defined(CONFIG_STM32_FSMC) && defined(CONFIG_ENC28J60)
@@ -224,9 +231,14 @@
                                GPIO_OUTPUT_SET|GPIO_PORTA|GPIO_PIN4)
 #  define GPIO_ENC28J60_RESET (GPIO_OUTPUT|GPIO_CNF_OUTPP|GPIO_MODE_50MHz|\
                                GPIO_OUTPUT_CLEAR|GPIO_PORTE|GPIO_PIN1)
+#ifdef CONFIG_ARCH_BOARD_FIRE_STM32V3
+#  define GPIO_ENC28J60_INTR  (GPIO_INPUT|GPIO_CNF_INFLOAT|GPIO_MODE_INPUT|\
+                               GPIO_EXTI|GPIO_PORTE|GPIO_PIN4)
+#else /* CONFIG_ARCH_BOARD_FIRE_STM32V2 */
 #  define GPIO_ENC28J60_INTR  (GPIO_INPUT|GPIO_CNF_INFLOAT|GPIO_MODE_INPUT|\
                                GPIO_EXTI|GPIO_PORTE|GPIO_PIN5)
 #endif
+#endif
 
 /* MP3
  *
diff --git a/nuttx/lib/stdio/lib_sscanf.c b/nuttx/lib/stdio/lib_sscanf.c
index 01c96c21d..11b5f387e 100644
--- a/nuttx/lib/stdio/lib_sscanf.c
+++ b/nuttx/lib/stdio/lib_sscanf.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * lib/stdio/lib_sscanf.c
  *
- *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008, 2011-2012 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -63,7 +63,7 @@
  * Global Function Prototypes
  ****************************************************************************/
 
-int vsscanf(char *buf, const char *s, va_list ap);
+int vsscanf(char *buf, const char *fmt, va_list ap);
 
 /**************************************************************************
  * Global Constant Data
@@ -109,67 +109,81 @@ int sscanf(FAR const char *buf, FAR const char *fmt, ...)
  *    ANSI standard vsscanf implementation.
  *
  ****************************************************************************/
-int vsscanf(FAR char *buf, FAR const char *s, va_list ap)
+
+int vsscanf(FAR char *buf, FAR const char *fmt, va_list ap)
 {
+  FAR char       *bufstart;
+  FAR char       *tv;
+  FAR const char *tc;
   int             count;
   int             noassign;
   int             width;
   int             base = 10;
   int             lflag;
-  FAR char       *tv;
-  FAR const char *tc;
   char            tmp[MAXLN];
 
-  lvdbg("vsscanf: buf=\"%s\" fmt=\"%s\"\n", buf, s);
+  lvdbg("vsscanf: buf=\"%s\" fmt=\"%s\"\n", buf, fmt);
+
+  /* Remember the start of the input buffer.  We will need this for %n
+   * calculations.
+   */
 
-  count = noassign = width = lflag = 0;
-  while (*s && *buf)
+  bufstart = buf;
+
+  /* Parse the format, extracting values from the input buffer as needed */
+
+  count    = 0;
+  noassign = 0;
+  width    = 0;
+  lflag    = 0;
+
+  while (*fmt && *buf)
     {
       /* Skip over white space */
 
-      while (isspace(*s))
+      while (isspace(*fmt))
         {
-          s++;
+          fmt++;
         }
 
       /* Check for a conversion specifier */
 
-      if (*s == '%')
+      if (*fmt == '%')
         {
           lvdbg("vsscanf: Specifier found\n");
 
           /* Check for qualifiers on the conversion specifier */
-          s++;
-          for (; *s; s++)
+          fmt++;
+          for (; *fmt; fmt++)
             {
-              lvdbg("vsscanf: Processing %c\n", *s);
+              lvdbg("vsscanf: Processing %c\n", *fmt);
 
-              if (strchr("dibouxcsefg%", *s))
+              if (strchr("dibouxcsefgn%", *fmt))
                 {
                   break;
                 }
 
-              if (*s == '*')
+              if (*fmt == '*')
                 {
                   noassign = 1;
                 }
-              else if (*s == 'l' || *s == 'L')
+              else if (*fmt == 'l' || *fmt == 'L')
                 {
                   lflag = 1;
                 }
-              else if (*s >= '1' && *s <= '9')
+              else if (*fmt >= '1' && *fmt <= '9')
                 {
-                  for (tc = s; isdigit(*s); s++);
-                  strncpy(tmp, tc, s - tc);
-                  tmp[s - tc] = '\0';
+                  for (tc = fmt; isdigit(*fmt); fmt++);
+                  strncpy(tmp, tc, fmt - tc);
+                  tmp[fmt - tc] = '\0';
                   width = atoi(tmp);
-                  s--;
+                  fmt--;
                 }
             }
 
           /* Process %s:  String conversion */
 
-          if (*s == 's')
+          if (*fmt == 's')
             {
               lvdbg("vsscanf: Performing string conversion\n");
 
@@ -178,9 +192,26 @@ int vsscanf(FAR char *buf, FAR const char *s, va_list ap)
                   buf++;
                 }
 
+              /* Was a fieldwidth specified? */
+
               if (!width)
                 {
-                  width = strcspn(buf, spaces);
+                  /* No... is there a space after the format? */
+
+#if 0 /* Needs more thought */
+                  if (isspace(*(s + 1)) || *(s + 1) == 0)
+#endif
+                    {
+                      /* Use the input up until the first white space is
+                       * encountered.  NOTE:  This means that values on the
+                       * input line must be separated by whitespace or they
+                       * will get combined! This is a bug.  We have no good
+                       * way of determining the width of the data if there
+                       * is no field with and no space separating the input.
+                       */
+
+                      width = strcspn(buf, spaces);
+                    }
                 }
 
               if (!noassign)
@@ -189,17 +220,22 @@ int vsscanf(FAR char *buf, FAR const char *s, va_list ap)
                   strncpy(tv, buf, width);
                   tv[width] = '\0';
                 }
+
               buf += width;
             }
 
           /* Process %c:  Character conversion */
 
-          else if (*s == 'c')
+          else if (*fmt == 'c')
             {
               lvdbg("vsscanf: Performing character conversion\n");
 
+              /* Was a fieldwidth specified? */
+
               if (!width)
                 {
+                  /* No, then width is this one single character */
+
                   width = 1;
                 }
 
@@ -209,12 +245,13 @@ int vsscanf(FAR char *buf, FAR const char *s, va_list ap)
                   strncpy(tv, buf, width);
                   tv[width] = '\0';
                 }
+
               buf += width;
             }
 
           /* Process %d, %o, %b, %x, %u:  Various integer conversions */
 
-          else if (strchr("dobxu", *s))
+          else if (strchr("dobxu", *fmt))
             {
               lvdbg("vsscanf: Performing integer conversion\n");
 
@@ -229,37 +266,47 @@ int vsscanf(FAR char *buf, FAR const char *s, va_list ap)
                * conversion specification.
                */
 
-              if (*s == 'd' || *s == 'u')
+              if (*fmt == 'd' || *fmt == 'u')
                 {
                   base = 10;
                 }
-              else if (*s == 'x')
+              else if (*fmt == 'x')
                 {
                   base = 16;
                 }
-              else if (*s == 'o')
+              else if (*fmt == 'o')
                 {
                   base = 8;
                 }
-              else if (*s == 'b')
+              else if (*fmt == 'b')
                 {
                   base = 2;
                 }
 
-              /* Copy the integer string into a temporary working buffer. */
+              /* Was a fieldwidth specified? */
 
               if (!width)
                 {
+                  /* No... is there a space after the format? */
+
+#if 0 /* Needs more thought */
                   if (isspace(*(s + 1)) || *(s + 1) == 0)
+#endif
                     {
+                      /* Use the input up until the first white space is
+                       * encountered.  NOTE:  This means that values on the
+                       * input line must be separated by whitespace or they
+                       * will get combined! This is a bug.  We have no good
+                       * way of determining the width of the data if there
+                       * is no field with and no space separating the input.
+                       */
+
                       width = strcspn(buf, spaces);
                     }
-                  else
-                    {
-                      width = strchr(buf, *(s + 1)) - buf;
-                    }
                 }
 
+              /* Copy the numeric string into a temporary working buffer. */
+
               strncpy(tmp, buf, width);
               tmp[width] = '\0';
 
@@ -284,7 +331,7 @@ int vsscanf(FAR char *buf, FAR const char *s, va_list ap)
 
           /* Process %f:  Floating point conversion */
 
-          else if (*s == 'f')
+          else if (*fmt == 'f')
             {
 #ifndef CONFIG_LIBC_FLOATINGPOINT
               /* No floating point conversions */
@@ -303,20 +350,30 @@ int vsscanf(FAR char *buf, FAR const char *s, va_list ap)
                   buf++;
                 }
 
-              /* Copy the real string into a temporary working buffer. */
+              /* Was a fieldwidth specified? */
 
               if (!width)
                 {
+                  /* No... is there a space after the format? */
+
+#if 0 /* Needs more thought */
                   if (isspace(*(s + 1)) || *(s + 1) == 0)
+#endif
                     {
-                      width = strcspn(buf, spaces);
-                    }
-                  else
-                    {
-                      width = strchr(buf, *(s + 1)) - buf;
+                      /* Use the input up until the first white space is
+                       * encountered.  NOTE:  This means that values on the
+                       * input line must be separated by whitespace or they
+                       * will get combined! This is a bug.  We have no good
+                       * way of determining the width of the data if there
+                       * is no field with and no space separating the input.
+                       */
+
+                     width = strcspn(buf, spaces);
                     }
                 }
 
+              /* Copy the real string into a temporary working buffer. */
+
               strncpy(tmp, buf, width);
               tmp[width] = '\0';
               buf += width;
@@ -356,13 +413,28 @@ int vsscanf(FAR char *buf, FAR const char *s, va_list ap)
 #endif
             }
 
-          if (!noassign)
+          /* Process %n:  Character count */
+
+          else if (*fmt == 'n')
+            {
+              lvdbg("vsscanf: Performing character count\n");
+
+              if (!noassign)
+                {
+                  int *pint = va_arg(ap, int*);
+                  *pint = (int)(buf - bufstart) - 1;
+                }
+            }
+
+          /* Note %n does not count as a conversion */
+
+          if (!noassign && *fmt != 'n')
             {
               count++;
             }
 
           width = noassign = lflag = 0;
-          s++;
+          fmt++;
         }
 
     /* Its is not a conversion specifier */
@@ -374,13 +446,13 @@ int vsscanf(FAR char *buf, FAR const char *s, va_list ap)
               buf++;
             }
 
-          if (*s != *buf)
+          if (*fmt != *buf)
             {
               break;
             }
           else
             {
-              s++;
+              fmt++;
               buf++;
             }
         }