STM32_Servo_Controller/stdio/printf.c at master · dccharacter/STM32_Servo_Controller · GitHub

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/**************************************************************************//*****

* @file printf.c

* @brief Implementation of several stdio.h methods, such as printf(),

* sprintf() and so on. This reduces the memory footprint of the

* binary when using those methods, compared to the libc implementation.

********************************************************************************/

#include <stdio.h>

#include <stdarg.h>

#include "stm32f10x_usart.h"

/**

* @brief Transmit a char, if you want to use printf(),

* you need implement this function

* @param pStr Storage string.

* @param c Character to write.

void PrintChar(char c)

{

/* Send a char like:

while(Transfer not completed);

Transmit a char;

while (!USART_GetFlagStatus(USART3, USART_FLAG_TXE));

USART_SendData(USART3, c);

}

/** Maximum string size allowed (in bytes). */

#define MAX_STRING_SIZE 100

/** Required for proper compilation. */

struct _reent r = {0, (FILE *) 0, (FILE *) 1, (FILE *) 0};

struct _reent *_impure_ptr = &r;

/**

* @brief Writes a character inside the given string. Returns 1.

* @param pStr Storage string.

* @param c Character to write.

signed int PutChar(char *pStr, char c)

{

*pStr = c;

return 1;

}

/**

* @brief Writes a string inside the given string.

* @param pStr Storage string.

* @param pSource Source string.

* @return The size of the written

signed int PutString(char *pStr, const char *pSource)

{

signed int num = 0;

while (*pSource != 0) {

*pStr++ = *pSource++;

num++;

}

return num;

}

/**

* @brief Writes an unsigned int inside the given string, using the provided fill &

* width parameters.

* @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) {

PutChar(pStr, fill);

pStr++;

num++;

width--;

}

/* Write lower digit */

num += PutChar(pStr, (value % 10) + '0');

return num;

}

/**

* @brief Writes a signed int inside the given string, using the provided fill & width

* parameters.

* @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) {

PutChar(pStr, fill);

pStr++;

num++;

width--;

}

/* Write sign */

if (value < 0) {

num += PutChar(pStr, '-');

pStr++;

}

/* Write lower digit */

num += PutChar(pStr, (absolute % 10) + '0');

return num;

}

/**

* @brief Writes an hexadecimal value into a string, using the given fill, width &

* capital parameters.

* @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.

* @return The number of char written

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) {

PutChar(pStr, fill);

pStr++;

num++;

width--;

}

/* Write current digit */

if ((value & 0xF) < 10) {

PutChar(pStr, (value & 0xF) + '0');

}

else if (maj) {

PutChar(pStr, (value & 0xF) - 10 + 'A');

}

else {

PutChar(pStr, (value & 0xF) - 10 + 'a');

}

num++;

return num;

}

/* Global Functions ----------------------------------------------------------- */

/**

* @brief Stores the result of a formatted string into another string. Format

* arguments are given in a va_list instance.

* @param pStr Destination string.

* @param length Length of Destination string.

* @param pFormat Format string.

* @param ap Argument list.

* @return The number of characters written.

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++;

}

/* 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, va_arg(ap, char *)); break;

case 'c': num = PutChar(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;

}

/**

* @brief Stores the result of a formatted string into another string. Format

* arguments are given in a va_list instance.

* @param pStr Destination string.

* @param length Length of Destination string.

* @param pFormat Format string.

* @param ... Other arguments

* @return The number of characters written.

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;

}

/**

* @brief Stores the result of a formatted string into another string. Format

* arguments are given in a va_list instance.

* @param pString Destination string.

* @param length Length of Destination string.

* @param pFormat Format string.

* @param ap Argument list.

* @return The number of characters written.

signed int vsprintf(char *pString, const char *pFormat, va_list ap)

{

return vsnprintf(pString, MAX_STRING_SIZE, pFormat, ap);

}

/**

* @brief Outputs a formatted string on the given stream. Format arguments are given

* in a va_list instance.

* @param pStream Output stream.

* @param pFormat Format string

* @param ap Argument list.

signed int vfprintf(FILE *pStream, const char *pFormat, va_list ap)

{

char pStr[MAX_STRING_SIZE];

char pError[] = "stdio.c: increase MAX_STRING_SIZE\n\r";

/* Write formatted string in buffer */

if (vsprintf(pStr, pFormat, ap) >= MAX_STRING_SIZE) {

fputs(pError, stderr);

while (1); /* Increase MAX_STRING_SIZE */

}

/* Display string */

return fputs(pStr, pStream);

}

/**

* @brief 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)

{

return vfprintf(stdout, pFormat, ap);

}

/**

* @brief Outputs a formatted string on the given stream, using a variable

* number of arguments.

* @param pStream Output stream.

* @param pFormat Format string.

signed int fprintf(FILE *pStream, const char *pFormat, ...)

{

va_list ap;

signed int result;

/* Forward call to vfprintf */

va_start(ap, pFormat);

result = vfprintf(pStream, pFormat, ap);

va_end(ap);

return result;

}

/**

* @brief 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;

}

/**

* @brief Writes a formatted string inside another string.

* @param pStr torage 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;

}

/**

* @brief Outputs a string on stdout.

* @param pStr String to output.

signed int puts(const char *pStr)

{

return fputs(pStr, stdout);

}

/**

* @brief Implementation of fputc using the DBGU as the standard output. Required

* for printf().

* @param c Character to write.

* @param pStream Output stream.

* @param The character written if successful, or -1 if the output stream is

* not stdout or stderr.

signed int fputc(signed int c, FILE *pStream)

{

if ((pStream == stdout) || (pStream == stderr)) {

PrintChar(c);

return c;

}

else {

return EOF;

}

/**

* @brief Implementation of fputs using the DBGU as the standard output. Required

* for printf().

* @param pStr String to write.

* @param pStream Output stream.

* @return Number of characters written if successful, or -1 if the output

* stream is not stdout or stderr.

signed int fputs(const char *pStr, FILE *pStream)

{

signed int num = 0;

while (*pStr != 0) {

if (fputc(*pStr, pStream) == -1) {

return -1;

}

num++;

pStr++;

}

return num;

}

/* --------------------------------- End Of File ------------------------------ */

STM32_Servo_Controller/stdio/printf.c at master · dccharacter/STM32_Servo_Controller · GitHub

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