FreeRTOS/Demo/Common/drivers/LuminaryMicro/ustdlib.c - third_party/github/FreeRTOS/FreeRTOS-Kernel - Git at Google

 //*****************************************************************************
 //
 // ustdlib.c - Simple standard library functions.
 //
 // Copyright (c) 2007 Luminary Micro, Inc.  All rights reserved.
 //
 // Software License Agreement
 //
 // Luminary Micro, Inc. (LMI) is supplying this software for use solely and
 // exclusively on LMI's microcontroller products.
 //
 // The software is owned by LMI and/or its suppliers, and is protected under
 // applicable copyright laws.  All rights are reserved.  Any use in violation
 // of the foregoing restrictions may subject the user to criminal sanctions
 // under applicable laws, as well as to civil liability for the breach of the
 // terms and conditions of this license.
 //
 // THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
 // OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
 // LMI SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
 // CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
 //
 //*****************************************************************************

 #include <stdarg.h>
 #include <string.h>
 #include "debug.h"

 //*****************************************************************************
 //
 //! \addtogroup utilities_api
 //! @{
 //
 //*****************************************************************************

 //*****************************************************************************
 //
 // A mapping from an integer between 0 and 15 to its ASCII character
 // equivalent.
 //
 //*****************************************************************************
 static const char * const g_pcHex = "0123456789abcdef";

 //*****************************************************************************
 //
 //! A simple vsnprintf function supporting \%c, \%d, \%s, \%u, \%x, and \%X.
 //!
 //! \param pcBuf points to the buffer where the converted string is stored.
 //! \param ulSize is the size of the buffer.
 //! \param pcString is the format string.
 //! \param vaArgP is the list of optional arguments, which depend on the
 //! contents of the format string.
 //!
 //! This function is very similar to the C library <tt>vsnprintf()</tt>
 //! function. Only the following formatting characters are supported:
 //!
 //! - \%c to print a character
 //! - \%d to print a decimal value
 //! - \%s to print a string
 //! - \%u to print an unsigned decimal value
 //! - \%x to print a hexadecimal value using lower case letters
 //! - \%X to print a hexadecimal value using lower case letters (not upper case
 //! letters as would typically be used)
 //! - \%\% to print out a \% character
 //!
 //! For \%d, \%u, \%x, and \%X, an optional number may reside between the \%
 //! and the format character, which specifies the minimum number of characters
 //! to use for that value; if preceeded by a 0 then the extra characters will
 //! be filled with zeros instead of spaces.  For example, ``\%8d'' will use
 //! eight characters to print the decimal value with spaces added to reach
 //! eight; ``\%08d'' will use eight characters as well but will add zeros
 //! instead of spaces.
 //!
 //! The type of the arguments after \b pcString must match the requirements of
 //! the format string.  For example, if an integer was passed where a string
 //! was expected, an error of some kind will most likely occur.
 //!
 //! The \b ulSize parameter limits the number of characters that will be
 //! stored in the buffer pointed to by \b pcBuf to prevent the possibility
 //! of a buffer overflow.  The buffer size should be large enough to hold
 //! the expected converted output string, including the null termination
 //! character.
 //!
 //! The function will return the number of characters that would be
 //! converted as if there were no limit on the buffer size.  Therefore
 //! it is possible for the function to return a count that is greater than
 //! the specified buffer size.  If this happens, it means that the output
 //! was truncated.
 //!
 //! \return the number of characters that were to be stored, not including
 //! the NULL termination character, regardless of space in the buffer.
 //
 //*****************************************************************************
 int
 uvsnprintf(char *pcBuf, unsigned long ulSize, const char *pcString,
            va_list vaArgP)
 {
     unsigned long ulIdx, ulValue, ulCount, ulBase;
     char *pcStr, cFill;
     int iConvertCount = 0;

     //
     // Check the arguments.
     //
     ASSERT(pcString != 0);
     ASSERT(pcBuf != 0);
     ASSERT(ulSize != 0);

     //
     // Adjust buffer size limit to allow one space for null termination.
     //
     if(ulSize)
     {
         ulSize--;
     }

     //
     // Initialize the count of characters converted.
     //
     iConvertCount = 0;

     //
     // Loop while there are more characters in the format string.
     //
     while(*pcString)
     {
         //
         // Find the first non-% character, or the end of the string.
         //
         for(ulIdx = 0; (pcString[ulIdx] != '%') && (pcString[ulIdx] != '\0');
             ulIdx++)
         {
         }

         //
         // Write this portion of the string to the output buffer.  If
         // there are more characters to write than there is space in the
         // buffer, then only write as much as will fit in the buffer.
         //
         if(ulIdx > ulSize)
         {
             strncpy(pcBuf, pcString, ulSize);
             pcBuf += ulSize;
             ulSize = 0;
         }
         else
         {
             strncpy(pcBuf, pcString, ulIdx);
             pcBuf += ulIdx;
             ulSize -= ulIdx;
         }

         //
         // Update the conversion count.  This will be the number of
         // characters that should have been written, even if there was
         // not room in the buffer.
         //
         iConvertCount += ulIdx;

         //
         // Skip the portion of the format string that was written.
         //
         pcString += ulIdx;

         //
         // See if the next character is a %.
         //
         if(*pcString == '%')
         {
             //
             // Skip the %.
             //
             pcString++;

             //
             // Set the digit count to zero, and the fill character to space
             // (i.e. to the defaults).
             //
             ulCount = 0;
             cFill = ' ';

             //
             // It may be necessary to get back here to process more characters.
             // Goto's aren't pretty, but effective.  I feel extremely dirty for
             // using not one but two of the beasts.
             //
 again:

             //
             // Determine how to handle the next character.
             //
             switch(*pcString++)
             {
                 //
                 // Handle the digit characters.
                 //
                 case '0':
                 case '1':
                 case '2':
                 case '3':
                 case '4':
                 case '5':
                 case '6':
                 case '7':
                 case '8':
                 case '9':
                 {
                     //
                     // If this is a zero, and it is the first digit, then the
                     // fill character is a zero instead of a space.
                     //
                     if((pcString[-1] == '0') && (ulCount == 0))
                     {
                         cFill = '0';
                     }

                     //
                     // Update the digit count.
                     //
                     ulCount *= 10;
                     ulCount += pcString[-1] - '0';

                     //
                     // Get the next character.
                     //
                     goto again;
                 }

                 //
                 // Handle the %c command.
                 //
                 case 'c':
                 {
                     //
                     // Get the value from the varargs.
                     //
                     ulValue = va_arg(vaArgP, unsigned long);

                     //
                     // Copy the character to the output buffer, if
                     // there is room.  Update the buffer size remaining.
                     //
                     if(ulSize != 0)
                     {
                         *pcBuf++ = (char)ulValue;
                         ulSize--;
                     }

                     //
                     // Update the conversion count.
                     //
                     iConvertCount++;

                     //
                     // This command has been handled.
                     //
                     break;
                 }

                 //
                 // Handle the %d command.
                 //
                 case 'd':
                 {
                     //
                     // Get the value from the varargs.
                     //
                     ulValue = va_arg(vaArgP, unsigned long);

                     //
                     // If the value is negative, make it positive and stick a
                     // minus sign in the beginning of the buffer.
                     //
                     if((long)ulValue < 0)
                     {
                         ulValue = -(long)ulValue;

                         if(ulSize != 0)
                         {
                             *pcBuf++ = '-';
                             ulSize--;
                         }

                         //
                         // Update the conversion count.
                         //
                         iConvertCount++;
                     }

                     //
                     // Set the base to 10.
                     //
                     ulBase = 10;

                     //
                     // Convert the value to ASCII.
                     //
                     goto convert;
                 }

                 //
                 // Handle the %s command.
                 //
                 case 's':
                 {
                     //
                     // Get the string pointer from the varargs.
                     //
                     pcStr = va_arg(vaArgP, char *);

                     //
                     // Determine the length of the string.
                     //
                     for(ulIdx = 0; pcStr[ulIdx] != '\0'; ulIdx++)
                     {
                     }

                     //
                     // Copy the string to the output buffer.  Only copy
                     // as much as will fit in the buffer.  Update the
                     // output buffer pointer and the space remaining.
                     //
                     if(ulIdx > ulSize)
                     {
                         strncpy(pcBuf, pcStr, ulSize);
                         pcBuf += ulSize;
                         ulSize = 0;
                     }
                     else
                     {
                         strncpy(pcBuf, pcStr, ulIdx);
                         pcBuf += ulIdx;
                         ulSize -= ulIdx;
                     }

                     //
                     // Update the conversion count.  This will be the number of
                     // characters that should have been written, even if there
                     // was not room in the buffer.
                     //
                     iConvertCount += ulIdx;

                     //
                     //
                     // This command has been handled.
                     //
                     break;
                 }

                 //
                 // Handle the %u command.
                 //
                 case 'u':
                 {
                     //
                     // Get the value from the varargs.
                     //
                     ulValue = va_arg(vaArgP, unsigned long);

                     //
                     // Set the base to 10.
                     //
                     ulBase = 10;

                     //
                     // Convert the value to ASCII.
                     //
                     goto convert;
                 }

                 //
                 // Handle the %x and %X commands.  Note that they are treated
                 // identically; i.e. %X will use lower case letters for a-f
                 // instead of the upper case letters is should use.
                 //
                 case 'x':
                 case 'X':
                 {
                     //
                     // Get the value from the varargs.
                     //
                     ulValue = va_arg(vaArgP, unsigned long);

                     //
                     // Set the base to 16.
                     //
                     ulBase = 16;

                     //
                     // Determine the number of digits in the string version of
                     // the value.
                     //
 convert:
                     for(ulIdx = 1;
                         (((ulIdx * ulBase) <= ulValue) &&
                          (((ulIdx * ulBase) / ulBase) == ulIdx));
                         ulIdx *= ulBase, ulCount--)
                     {
                     }

                     //
                     // Provide additional padding at the beginning of the
                     // string conversion if needed.
                     //
                     if((ulCount > 1) && (ulCount < 16))
                     {
                         for(ulCount--; ulCount; ulCount--)
                         {
                             //
                             // Copy the character to the output buffer if
                             // there is room.
                             //
                             if(ulSize != 0)
                             {
                                 *pcBuf++ = cFill;
                                 ulSize--;
                             }

                             //
                             // Update the conversion count.
                             //
                             iConvertCount++;
                         }
                     }

                     //
                     // Convert the value into a string.
                     //
                     for(; ulIdx; ulIdx /= ulBase)
                     {
                         //
                         // Copy the character to the output buffer if
                         // there is room.
                         //
                         if(ulSize != 0)
                         {
                             *pcBuf++ = g_pcHex[(ulValue / ulIdx) % ulBase];
                             ulSize--;
                         }

                         //
                         // Update the conversion count.
                         //
                         iConvertCount++;
                     }

                     //
                     // This command has been handled.
                     //
                     break;
                 }

                 //
                 // Handle the %% command.
                 //
                 case '%':
                 {
                     //
                     // Simply write a single %.
                     //
                     if(ulSize != 0)
                     {
                         *pcBuf++ = pcString[-1];
                         ulSize--;
                     }

                     //
                     // Update the conversion count.
                     //
                     iConvertCount++;

                     //
                     // This command has been handled.
                     //
                     break;
                 }

                 //
                 // Handle all other commands.
                 //
                 default:
                 {
                     //
                     // Indicate an error.
                     //
                     if(ulSize >= 5)
                     {
                         strncpy(pcBuf, "ERROR", 5);
                         pcBuf += 5;
                         ulSize -= 5;
                     }
                     else
                     {
                         strncpy(pcBuf, "ERROR", ulSize);
                         pcBuf += ulSize;
                         ulSize = 0;
                     }

                     //
                     // Update the conversion count.
                     //
                     iConvertCount += 5;

                     //
                     // This command has been handled.
                     //
                     break;
                 }
             }
         }
     }

     //
     // Null terminate the string in the buffer.
     //
     *pcBuf = 0;
     return(iConvertCount);
 }

 //*****************************************************************************
 //
 //! A simple sprintf function supporting \%c, \%d, \%s, \%u, \%x, and \%X.
 //!
 //! \param pcBuf is the buffer where the converted string is stored.
 //! \param pcString is the format string.
 //! \param ... are the optional arguments, which depend on the contents of the
 //! format string.
 //!
 //! This function is very similar to the C library <tt>sprintf()</tt> function.
 //! Only the following formatting characters are supported:
 //!
 //! - \%c to print a character
 //! - \%d to print a decimal value
 //! - \%s to print a string
 //! - \%u to print an unsigned decimal value
 //! - \%x to print a hexadecimal value using lower case letters
 //! - \%X to print a hexadecimal value using lower case letters (not upper case
 //! letters as would typically be used)
 //! - \%\% to print out a \% character
 //!
 //! For \%d, \%u, \%x, and \%X, an optional number may reside between the \%
 //! and the format character, which specifies the minimum number of characters
 //! to use for that value; if preceeded by a 0 then the extra characters will
 //! be filled with zeros instead of spaces.  For example, ``\%8d'' will use
 //! eight characters to print the decimal value with spaces added to reach
 //! eight; ``\%08d'' will use eight characters as well but will add zeros
 //! instead of spaces.
 //!
 //! The type of the arguments after \b pcString must match the requirements of
 //! the format string.  For example, if an integer was passed where a string
 //! was expected, an error of some kind will most likely occur.
 //!
 //! The caller must ensure that the buffer pcBuf is large enough to hold the
 //! entire converted string, including the null termination character.
 //!
 //! \return The count of characters that were written to the output buffer,
 //! not including the NULL termination character.
 //
 //*****************************************************************************
 int
 usprintf(char *pcBuf, const char *pcString, ...)
 {
     va_list vaArgP;
     int iRet;

     //
     // Start the varargs processing.
     //
     va_start(vaArgP, pcString);

     //
     // Call vsnprintf to perform the conversion.  Use a
     // large number for the buffer size.
     //
     iRet = uvsnprintf(pcBuf, 0xffff, pcString, vaArgP);

     //
     // End the varargs processing.
     //
     va_end(vaArgP);

     //
     // Return the conversion count.
     //
     return(iRet);
 }

 //*****************************************************************************
 //
 //! A simple snprintf function supporting \%c, \%d, \%s, \%u, \%x, and \%X.
 //!
 //! \param pcBuf is the buffer where the converted string is stored.
 //! \param ulSize is the size of the buffer.
 //! \param pcString is the format string.
 //! \param ... are the optional arguments, which depend on the contents of the
 //! format string.
 //!
 //! This function is very similar to the C library <tt>sprintf()</tt> function.
 //! Only the following formatting characters are supported:
 //!
 //! - \%c to print a character
 //! - \%d to print a decimal value
 //! - \%s to print a string
 //! - \%u to print an unsigned decimal value
 //! - \%x to print a hexadecimal value using lower case letters
 //! - \%X to print a hexadecimal value using lower case letters (not upper case
 //! letters as would typically be used)
 //! - \%\% to print out a \% character
 //!
 //! For \%d, \%u, \%x, and \%X, an optional number may reside between the \%
 //! and the format character, which specifies the minimum number of characters
 //! to use for that value; if preceeded by a 0 then the extra characters will
 //! be filled with zeros instead of spaces.  For example, ``\%8d'' will use
 //! eight characters to print the decimal value with spaces added to reach
 //! eight; ``\%08d'' will use eight characters as well but will add zeros
 //! instead of spaces.
 //!
 //! The type of the arguments after \b pcString must match the requirements of
 //! the format string.  For example, if an integer was passed where a string
 //! was expected, an error of some kind will most likely occur.
 //!
 //! The function will copy at most \b ulSize - 1 characters into the
 //! buffer \b pcBuf.  One space is reserved in the buffer for the null
 //! termination character.
 //!
 //! The function will return the number of characters that would be
 //! converted as if there were no limit on the buffer size.  Therefore
 //! it is possible for the function to return a count that is greater than
 //! the specified buffer size.  If this happens, it means that the output
 //! was truncated.
 //!
 //! \return the number of characters that were to be stored, not including
 //! the NULL termination character, regardless of space in the buffer.
 //
 //*****************************************************************************
 int
 usnprintf(char *pcBuf, unsigned long ulSize, const char *pcString, ...)
 {
 int iRet;

     va_list vaArgP;

     //
     // Start the varargs processing.
     //
     va_start(vaArgP, pcString);

     //
     // Call vsnprintf to perform the conversion.
     //
     iRet = uvsnprintf(pcBuf, ulSize, pcString, vaArgP);

     //
     // End the varargs processing.
     //
     va_end(vaArgP);

     //
     // Return the conversion count.
     //
     return(iRet);
 }

 //*****************************************************************************
 //
 // Close the Doxygen group.
 //! @}
 //
 //*****************************************************************************
	//*****************************************************************************
	//
	// ustdlib.c - Simple standard library functions.
	//
	// Copyright (c) 2007 Luminary Micro, Inc. All rights reserved.
	//
	// Software License Agreement
	//
	// Luminary Micro, Inc. (LMI) is supplying this software for use solely and
	// exclusively on LMI's microcontroller products.
	//
	// The software is owned by LMI and/or its suppliers, and is protected under
	// applicable copyright laws. All rights are reserved. Any use in violation
	// of the foregoing restrictions may subject the user to criminal sanctions
	// under applicable laws, as well as to civil liability for the breach of the
	// terms and conditions of this license.
	//
	// THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
	// OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
	// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
	// LMI SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
	// CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
	//
	//*****************************************************************************

	#include <stdarg.h>
	#include <string.h>
	#include "debug.h"

	//*****************************************************************************
	//
	//! \addtogroup utilities_api
	//! @{
	//
	//*****************************************************************************

	//*****************************************************************************
	//
	// A mapping from an integer between 0 and 15 to its ASCII character
	// equivalent.
	//
	//*****************************************************************************
	static const char * const g_pcHex = "0123456789abcdef";

	//*****************************************************************************
	//
	//! A simple vsnprintf function supporting \%c, \%d, \%s, \%u, \%x, and \%X.
	//!
	//! \param pcBuf points to the buffer where the converted string is stored.
	//! \param ulSize is the size of the buffer.
	//! \param pcString is the format string.
	//! \param vaArgP is the list of optional arguments, which depend on the
	//! contents of the format string.
	//!
	//! This function is very similar to the C library <tt>vsnprintf()</tt>
	//! function. Only the following formatting characters are supported:
	//!
	//! - \%c to print a character
	//! - \%d to print a decimal value
	//! - \%s to print a string
	//! - \%u to print an unsigned decimal value
	//! - \%x to print a hexadecimal value using lower case letters
	//! - \%X to print a hexadecimal value using lower case letters (not upper case
	//! letters as would typically be used)
	//! - \%\% to print out a \% character
	//!
	//! For \%d, \%u, \%x, and \%X, an optional number may reside between the \%
	//! and the format character, which specifies the minimum number of characters
	//! to use for that value; if preceeded by a 0 then the extra characters will
	//! be filled with zeros instead of spaces. For example, ``\%8d'' will use
	//! eight characters to print the decimal value with spaces added to reach
	//! eight; ``\%08d'' will use eight characters as well but will add zeros
	//! instead of spaces.
	//!
	//! The type of the arguments after \b pcString must match the requirements of
	//! the format string. For example, if an integer was passed where a string
	//! was expected, an error of some kind will most likely occur.
	//!
	//! The \b ulSize parameter limits the number of characters that will be
	//! stored in the buffer pointed to by \b pcBuf to prevent the possibility
	//! of a buffer overflow. The buffer size should be large enough to hold
	//! the expected converted output string, including the null termination
	//! character.
	//!
	//! The function will return the number of characters that would be
	//! converted as if there were no limit on the buffer size. Therefore
	//! it is possible for the function to return a count that is greater than
	//! the specified buffer size. If this happens, it means that the output
	//! was truncated.
	//!
	//! \return the number of characters that were to be stored, not including
	//! the NULL termination character, regardless of space in the buffer.
	//
	//*****************************************************************************
	int
	uvsnprintf(char pcBuf, unsigned long ulSize, const char pcString,
	va_list vaArgP)
	{
	unsigned long ulIdx, ulValue, ulCount, ulBase;
	char *pcStr, cFill;
	int iConvertCount = 0;

	//
	// Check the arguments.
	//
	ASSERT(pcString != 0);
	ASSERT(pcBuf != 0);
	ASSERT(ulSize != 0);

	//
	// Adjust buffer size limit to allow one space for null termination.
	//
	if(ulSize)
	{
	ulSize--;
	}

	//
	// Initialize the count of characters converted.
	//
	iConvertCount = 0;

	//
	// Loop while there are more characters in the format string.
	//
	while(*pcString)
	{
	//
	// Find the first non-% character, or the end of the string.
	//
	for(ulIdx = 0; (pcString[ulIdx] != '%') && (pcString[ulIdx] != '\0');
	ulIdx++)
	{
	}

	//
	// Write this portion of the string to the output buffer. If
	// there are more characters to write than there is space in the
	// buffer, then only write as much as will fit in the buffer.
	//
	if(ulIdx > ulSize)
	{
	strncpy(pcBuf, pcString, ulSize);
	pcBuf += ulSize;
	ulSize = 0;
	}
	else
	{
	strncpy(pcBuf, pcString, ulIdx);
	pcBuf += ulIdx;
	ulSize -= ulIdx;
	}

	//
	// Update the conversion count. This will be the number of
	// characters that should have been written, even if there was
	// not room in the buffer.
	//
	iConvertCount += ulIdx;

	//
	// Skip the portion of the format string that was written.
	//
	pcString += ulIdx;

	//
	// See if the next character is a %.
	//
	if(*pcString == '%')
	{
	//
	// Skip the %.
	//
	pcString++;

	//
	// Set the digit count to zero, and the fill character to space
	// (i.e. to the defaults).
	//
	ulCount = 0;
	cFill = ' ';

	//
	// It may be necessary to get back here to process more characters.
	// Goto's aren't pretty, but effective. I feel extremely dirty for
	// using not one but two of the beasts.
	//
	again:

	//
	// Determine how to handle the next character.
	//
	switch(*pcString++)
	{
	//
	// Handle the digit characters.
	//
	case '0':
	case '1':
	case '2':
	case '3':
	case '4':
	case '5':
	case '6':
	case '7':
	case '8':
	case '9':
	{
	//
	// If this is a zero, and it is the first digit, then the
	// fill character is a zero instead of a space.
	//
	if((pcString[-1] == '0') && (ulCount == 0))
	{
	cFill = '0';
	}

	//
	// Update the digit count.
	//
	ulCount *= 10;
	ulCount += pcString[-1] - '0';

	//
	// Get the next character.
	//
	goto again;
	}

	//
	// Handle the %c command.
	//
	case 'c':
	{
	//
	// Get the value from the varargs.
	//
	ulValue = va_arg(vaArgP, unsigned long);

	//
	// Copy the character to the output buffer, if
	// there is room. Update the buffer size remaining.
	//
	if(ulSize != 0)
	{
	*pcBuf++ = (char)ulValue;
	ulSize--;
	}

	//
	// Update the conversion count.
	//
	iConvertCount++;

	//
	// This command has been handled.
	//
	break;
	}

	//
	// Handle the %d command.
	//
	case 'd':
	{
	//
	// Get the value from the varargs.
	//
	ulValue = va_arg(vaArgP, unsigned long);

	//
	// If the value is negative, make it positive and stick a
	// minus sign in the beginning of the buffer.
	//
	if((long)ulValue < 0)
	{
	ulValue = -(long)ulValue;

	if(ulSize != 0)
	{
	*pcBuf++ = '-';
	ulSize--;
	}

	//
	// Update the conversion count.
	//
	iConvertCount++;
	}

	//
	// Set the base to 10.
	//
	ulBase = 10;

	//
	// Convert the value to ASCII.
	//
	goto convert;
	}

	//
	// Handle the %s command.
	//
	case 's':
	{
	//
	// Get the string pointer from the varargs.
	//
	pcStr = va_arg(vaArgP, char *);

	//
	// Determine the length of the string.
	//
	for(ulIdx = 0; pcStr[ulIdx] != '\0'; ulIdx++)
	{
	}

	//
	// Copy the string to the output buffer. Only copy
	// as much as will fit in the buffer. Update the
	// output buffer pointer and the space remaining.
	//
	if(ulIdx > ulSize)
	{
	strncpy(pcBuf, pcStr, ulSize);
	pcBuf += ulSize;
	ulSize = 0;
	}
	else
	{
	strncpy(pcBuf, pcStr, ulIdx);
	pcBuf += ulIdx;
	ulSize -= ulIdx;
	}

	//
	// Update the conversion count. This will be the number of
	// characters that should have been written, even if there
	// was not room in the buffer.
	//
	iConvertCount += ulIdx;

	//
	//
	// This command has been handled.
	//
	break;
	}

	//
	// Handle the %u command.
	//
	case 'u':
	{
	//
	// Get the value from the varargs.
	//
	ulValue = va_arg(vaArgP, unsigned long);

	//
	// Set the base to 10.
	//
	ulBase = 10;

	//
	// Convert the value to ASCII.
	//
	goto convert;
	}

	//
	// Handle the %x and %X commands. Note that they are treated
	// identically; i.e. %X will use lower case letters for a-f
	// instead of the upper case letters is should use.
	//
	case 'x':
	case 'X':
	{
	//
	// Get the value from the varargs.
	//
	ulValue = va_arg(vaArgP, unsigned long);

	//
	// Set the base to 16.
	//
	ulBase = 16;

	//
	// Determine the number of digits in the string version of
	// the value.
	//
	convert:
	for(ulIdx = 1;
	(((ulIdx * ulBase) <= ulValue) &&
	(((ulIdx * ulBase) / ulBase) == ulIdx));
	ulIdx *= ulBase, ulCount--)
	{
	}

	//
	// Provide additional padding at the beginning of the
	// string conversion if needed.
	//
	if((ulCount > 1) && (ulCount < 16))
	{
	for(ulCount--; ulCount; ulCount--)
	{
	//
	// Copy the character to the output buffer if
	// there is room.
	//
	if(ulSize != 0)
	{
	*pcBuf++ = cFill;
	ulSize--;
	}

	//
	// Update the conversion count.
	//
	iConvertCount++;
	}
	}

	//
	// Convert the value into a string.
	//
	for(; ulIdx; ulIdx /= ulBase)
	{
	//
	// Copy the character to the output buffer if
	// there is room.
	//
	if(ulSize != 0)
	{
	*pcBuf++ = g_pcHex[(ulValue / ulIdx) % ulBase];
	ulSize--;
	}

	//
	// Update the conversion count.
	//
	iConvertCount++;
	}

	//
	// This command has been handled.
	//
	break;
	}

	//
	// Handle the %% command.
	//
	case '%':
	{
	//
	// Simply write a single %.
	//
	if(ulSize != 0)
	{
	*pcBuf++ = pcString[-1];
	ulSize--;
	}

	//
	// Update the conversion count.
	//
	iConvertCount++;

	//
	// This command has been handled.
	//
	break;
	}

	//
	// Handle all other commands.
	//
	default:
	{
	//
	// Indicate an error.
	//
	if(ulSize >= 5)
	{
	strncpy(pcBuf, "ERROR", 5);
	pcBuf += 5;
	ulSize -= 5;
	}
	else
	{
	strncpy(pcBuf, "ERROR", ulSize);
	pcBuf += ulSize;
	ulSize = 0;
	}

	//
	// Update the conversion count.
	//
	iConvertCount += 5;

	//
	// This command has been handled.
	//
	break;
	}
	}
	}
	}

	//
	// Null terminate the string in the buffer.
	//
	*pcBuf = 0;
	return(iConvertCount);
	}

	//*****************************************************************************
	//
	//! A simple sprintf function supporting \%c, \%d, \%s, \%u, \%x, and \%X.
	//!
	//! \param pcBuf is the buffer where the converted string is stored.
	//! \param pcString is the format string.
	//! \param ... are the optional arguments, which depend on the contents of the
	//! format string.
	//!
	//! This function is very similar to the C library <tt>sprintf()</tt> function.
	//! Only the following formatting characters are supported:
	//!
	//! - \%c to print a character
	//! - \%d to print a decimal value
	//! - \%s to print a string
	//! - \%u to print an unsigned decimal value
	//! - \%x to print a hexadecimal value using lower case letters
	//! - \%X to print a hexadecimal value using lower case letters (not upper case
	//! letters as would typically be used)
	//! - \%\% to print out a \% character
	//!
	//! For \%d, \%u, \%x, and \%X, an optional number may reside between the \%
	//! and the format character, which specifies the minimum number of characters
	//! to use for that value; if preceeded by a 0 then the extra characters will
	//! be filled with zeros instead of spaces. For example, ``\%8d'' will use
	//! eight characters to print the decimal value with spaces added to reach
	//! eight; ``\%08d'' will use eight characters as well but will add zeros
	//! instead of spaces.
	//!
	//! The type of the arguments after \b pcString must match the requirements of
	//! the format string. For example, if an integer was passed where a string
	//! was expected, an error of some kind will most likely occur.
	//!
	//! The caller must ensure that the buffer pcBuf is large enough to hold the
	//! entire converted string, including the null termination character.
	//!
	//! \return The count of characters that were written to the output buffer,
	//! not including the NULL termination character.
	//
	//*****************************************************************************
	int
	usprintf(char pcBuf, const char pcString, ...)
	{
	va_list vaArgP;
	int iRet;

	//
	// Start the varargs processing.
	//
	va_start(vaArgP, pcString);

	//
	// Call vsnprintf to perform the conversion. Use a
	// large number for the buffer size.
	//
	iRet = uvsnprintf(pcBuf, 0xffff, pcString, vaArgP);

	//
	// End the varargs processing.
	//
	va_end(vaArgP);

	//
	// Return the conversion count.
	//
	return(iRet);
	}

	//*****************************************************************************
	//
	//! A simple snprintf function supporting \%c, \%d, \%s, \%u, \%x, and \%X.
	//!
	//! \param pcBuf is the buffer where the converted string is stored.
	//! \param ulSize is the size of the buffer.
	//! \param pcString is the format string.
	//! \param ... are the optional arguments, which depend on the contents of the
	//! format string.
	//!
	//! This function is very similar to the C library <tt>sprintf()</tt> function.
	//! Only the following formatting characters are supported:
	//!
	//! - \%c to print a character
	//! - \%d to print a decimal value
	//! - \%s to print a string
	//! - \%u to print an unsigned decimal value
	//! - \%x to print a hexadecimal value using lower case letters
	//! - \%X to print a hexadecimal value using lower case letters (not upper case
	//! letters as would typically be used)
	//! - \%\% to print out a \% character
	//!
	//! For \%d, \%u, \%x, and \%X, an optional number may reside between the \%
	//! and the format character, which specifies the minimum number of characters
	//! to use for that value; if preceeded by a 0 then the extra characters will
	//! be filled with zeros instead of spaces. For example, ``\%8d'' will use
	//! eight characters to print the decimal value with spaces added to reach
	//! eight; ``\%08d'' will use eight characters as well but will add zeros
	//! instead of spaces.
	//!
	//! The type of the arguments after \b pcString must match the requirements of
	//! the format string. For example, if an integer was passed where a string
	//! was expected, an error of some kind will most likely occur.
	//!
	//! The function will copy at most \b ulSize - 1 characters into the
	//! buffer \b pcBuf. One space is reserved in the buffer for the null
	//! termination character.
	//!
	//! The function will return the number of characters that would be
	//! converted as if there were no limit on the buffer size. Therefore
	//! it is possible for the function to return a count that is greater than
	//! the specified buffer size. If this happens, it means that the output
	//! was truncated.
	//!
	//! \return the number of characters that were to be stored, not including
	//! the NULL termination character, regardless of space in the buffer.
	//
	//*****************************************************************************
	int
	usnprintf(char pcBuf, unsigned long ulSize, const char pcString, ...)
	{
	int iRet;

	va_list vaArgP;

	//
	// Start the varargs processing.
	//
	va_start(vaArgP, pcString);

	//
	// Call vsnprintf to perform the conversion.
	//
	iRet = uvsnprintf(pcBuf, ulSize, pcString, vaArgP);

	//
	// End the varargs processing.
	//
	va_end(vaArgP);

	//
	// Return the conversion count.
	//
	return(iRet);
	}

	//*****************************************************************************
	//
	// Close the Doxygen group.
	//! @}
	//
	//*****************************************************************************