crashtest-r0ket/firmware/core/libc/stdio.c

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2011-05-15 11:27:49 +00:00
/*
* Software License Agreement (BSD License)
*
* Based on original stdio.c released by Atmel
* Copyright (c) 2008, Atmel Corporation
* All rights reserved.
*
* Modified by Roel Verdult, Copyright (c) 2010
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
//------------------------------------------------------------------------------
// Headers
//------------------------------------------------------------------------------
#include <stdio.h>
#include <stdarg.h>
#include <stdint.h>
//------------------------------------------------------------------------------
// Local Definitions
//------------------------------------------------------------------------------
// Maximum string size allowed (in bytes).
#define MAX_STRING_SIZE 255
//------------------------------------------------------------------------------
// Global Variables
//------------------------------------------------------------------------------
// Required for proper compilation.
//struct _reent r = {0, (FILE*) 0, (FILE*) 1, (FILE*) 0};
//struct _reent *_impure_ptr = &r;
//------------------------------------------------------------------------------
// Local Functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// Writes a character inside the given string. Returns 1.
// \param pStr Storage string.
// \param c Character to write.
//------------------------------------------------------------------------------
signed int append_char(char *pStr, char c)
{
*pStr = c;
return 1;
}
//------------------------------------------------------------------------------
// Writes a string inside the given string.
// Returns the size of the written
// string.
// \param pStr Storage string.
// \param pSource Source string.
//------------------------------------------------------------------------------
signed int PutString(char *pStr, char fill, signed int width, const char *pSource)
{
signed int num = 0;
while (*pSource != 0) {
*pStr++ = *pSource++;
num++;
}
width -= num;
while (width > 0) {
*pStr++ = fill;
num++;
width--;
}
return num;
}
//------------------------------------------------------------------------------
// Writes an unsigned int inside the given string, using the provided fill &
// width parameters.
// Returns the size in characters of the written integer.
// \param pStr Storage string.
// \param fill Fill character.
// \param width Minimum integer width.
// \param value Integer value.
//------------------------------------------------------------------------------
signed int PutUnsignedInt(
char *pStr,
char fill,
signed int width,
unsigned int value)
{
signed int num = 0;
// Take current digit into account when calculating width
width--;
// Recursively write upper digits
if ((value / 10) > 0) {
num = PutUnsignedInt(pStr, fill, width, value / 10);
pStr += num;
}
// Write filler characters
else {
while (width > 0) {
append_char(pStr, fill);
pStr++;
num++;
width--;
}
}
// Write lower digit
num += append_char(pStr, (value % 10) + '0');
return num;
}
//------------------------------------------------------------------------------
// Writes a signed int inside the given string, using the provided fill & width
// parameters.
// Returns the size of the written integer.
// \param pStr Storage string.
// \param fill Fill character.
// \param width Minimum integer width.
// \param value Signed integer value.
//------------------------------------------------------------------------------
signed int PutSignedInt(
char *pStr,
char fill,
signed int width,
signed int value)
{
signed int num = 0;
unsigned int absolute;
// Compute absolute value
if (value < 0) {
absolute = -value;
}
else {
absolute = value;
}
// Take current digit into account when calculating width
width--;
// Recursively write upper digits
if ((absolute / 10) > 0) {
if (value < 0) {
num = PutSignedInt(pStr, fill, width, -(absolute / 10));
}
else {
num = PutSignedInt(pStr, fill, width, absolute / 10);
}
pStr += num;
}
else {
// Reserve space for sign
if (value < 0) {
width--;
}
// Write filler characters
while (width > 0) {
append_char(pStr, fill);
pStr++;
num++;
width--;
}
// Write sign
if (value < 0) {
num += append_char(pStr, '-');
pStr++;
}
}
// Write lower digit
num += append_char(pStr, (absolute % 10) + '0');
return num;
}
//------------------------------------------------------------------------------
// Writes an hexadecimal value into a string, using the given fill, width &
// capital parameters.
// Returns the number of char written.
// \param pStr Storage string.
// \param fill Fill character.
// \param width Minimum integer width.
// \param maj Indicates if the letters must be printed in lower- or upper-case.
// \param value Hexadecimal value.
//------------------------------------------------------------------------------
signed int PutHexa(
char *pStr,
char fill,
signed int width,
unsigned char maj,
unsigned int value)
{
signed int num = 0;
// Decrement width
width--;
// Recursively output upper digits
if ((value >> 4) > 0) {
num += PutHexa(pStr, fill, width, maj, value >> 4);
pStr += num;
}
// Write filler chars
else {
while (width > 0) {
append_char(pStr, fill);
pStr++;
num++;
width--;
}
}
// Write current digit
if ((value & 0xF) < 10) {
append_char(pStr, (value & 0xF) + '0');
}
else if (maj) {
append_char(pStr, (value & 0xF) - 10 + 'A');
}
else {
append_char(pStr, (value & 0xF) - 10 + 'a');
}
num++;
return num;
}
//------------------------------------------------------------------------------
// Global Functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
/// Stores the result of a formatted string into another string. Format
/// arguments are given in a va_list instance.
/// Return the number of characters written.
/// \param pStr Destination string.
/// \param length Length of Destination string.
/// \param pFormat Format string.
/// \param ap Argument list.
//------------------------------------------------------------------------------
signed int vsnprintf(char *pStr, size_t length, const char *pFormat, va_list ap)
{
char fill;
unsigned char width;
signed int num = 0;
signed int size = 0;
// Clear the string
if (pStr) {
*pStr = 0;
}
// Phase string
while (*pFormat != 0 && size < length) {
// Normal character
if (*pFormat != '%') {
*pStr++ = *pFormat++;
size++;
}
// Escaped '%'
else if (*(pFormat+1) == '%') {
*pStr++ = '%';
pFormat += 2;
size++;
}
// Token delimiter
else {
fill = ' ';
width = 0;
pFormat++;
// Parse filler
if (*pFormat == '0') {
fill = '0';
pFormat++;
}
// Ignore justifier
if (*pFormat == '-') {
pFormat++;
}
// Parse width
while ((*pFormat >= '0') && (*pFormat <= '9')) {
width = (width*10) + *pFormat-'0';
pFormat++;
}
// Check if there is enough space
if (size + width > length) {
width = length - size;
}
// Parse type
switch (*pFormat) {
case 'd':
case 'i': num = PutSignedInt(pStr, fill, width, va_arg(ap, signed int)); break;
case 'u': num = PutUnsignedInt(pStr, fill, width, va_arg(ap, unsigned int)); break;
case 'x': num = PutHexa(pStr, fill, width, 0, va_arg(ap, unsigned int)); break;
case 'X': num = PutHexa(pStr, fill, width, 1, va_arg(ap, unsigned int)); break;
case 's': num = PutString(pStr, fill, width, va_arg(ap, char *)); break;
case 'c': num = append_char(pStr, va_arg(ap, unsigned int)); break;
default:
return EOF;
}
pFormat++;
pStr += num;
size += num;
}
}
// NULL-terminated (final \0 is not counted)
if (size < length) {
*pStr = 0;
}
else {
*(--pStr) = 0;
size--;
}
return size;
}
//------------------------------------------------------------------------------
/// Stores the result of a formatted string into another string. Format
/// arguments are given in a va_list instance.
/// Return the number of characters written.
/// \param pString Destination string.
/// \param length Length of Destination string.
/// \param pFormat Format string.
/// \param ... Other arguments
//------------------------------------------------------------------------------
signed int snprintf(char *pString, size_t length, const char *pFormat, ...)
{
va_list ap;
signed int rc;
va_start(ap, pFormat);
rc = vsnprintf(pString, length, pFormat, ap);
va_end(ap);
return rc;
}
//------------------------------------------------------------------------------
/// Stores the result of a formatted string into another string. Format
/// arguments are given in a va_list instance.
/// Return the number of characters written.
/// \param pString Destination string.
/// \param pFormat Format string.
/// \param ap Argument list.
//------------------------------------------------------------------------------
signed int vsprintf(char *pString, const char *pFormat, va_list ap)
{
return vsnprintf(pString, MAX_STRING_SIZE, pFormat, ap);
}
//------------------------------------------------------------------------------
/// Outputs a formatted string on the DBGU stream. Format arguments are given
/// in a va_list instance.
/// \param pFormat Format string
/// \param ap Argument list.
//------------------------------------------------------------------------------
signed int vprintf(const char *pFormat, va_list ap)
{
char pStr[MAX_STRING_SIZE];
char pError[] = "stdio.c: increase MAX_STRING_SIZE\r\n";
// Write formatted string in buffer
if (vsprintf(pStr, pFormat, ap) >= MAX_STRING_SIZE) {
puts(pError);
while (1); // Increase MAX_STRING_SIZE
}
// Display string
return puts(pStr);
}
//------------------------------------------------------------------------------
/// Outputs a formatted string on the DBGU stream, using a variable number of
/// arguments.
/// \param pFormat Format string.
//------------------------------------------------------------------------------
signed int printf(const char *pFormat, ...)
{
va_list ap;
signed int result;
// Forward call to vprintf
va_start(ap, pFormat);
result = vprintf(pFormat, ap);
va_end(ap);
return result;
}
//------------------------------------------------------------------------------
/// Writes a formatted string inside another string.
/// \param pStr Storage string.
/// \param pFormat Format string.
//------------------------------------------------------------------------------
signed int sprintf(char *pStr, const char *pFormat, ...)
{
va_list ap;
signed int result;
// Forward call to vsprintf
va_start(ap, pFormat);
result = vsprintf(pStr, pFormat, ap);
va_end(ap);
return result;
}