tiny_printf.c

/**
*****************************************************************************
**
**  File        : tiny_printf.c
**
**  Abstract    : Atollic TrueSTUDIO Minimal iprintf/siprintf/fiprintf
**                and puts/fputs.
**                Provides aliased declarations for printf/sprintf/fprintf
**                pointing to *iprintf variants.
**
**                The argument contains a format string that may include
**                conversion specifications. Each conversion specification
**                is introduced by the character %, and ends with a
**                conversion specifier.
**
**                The following conversion specifiers are supported
**                cdisuxX%
**
**                Usage:
**                c    character
**                d,i  signed integer (-sign added, + sign not supported)
**                s    character string
**                u    unsigned integer as decimal
**                x,X  unsigned integer as hexadecimal (uppercase letter)
**                %    % is written (conversion specification is '%%')
**
**                Note:
**                Character padding is not supported
**
**  Environment : Atollic TrueSTUDIO
**
**  Distribution: The file is distributed "as is", without any warranty
**                of any kind.
**
**  (c)Copyright Atollic AB.
**  You may use this file as-is or modify it according to the needs of your
**  project. This file may only be built (assembled or compiled and linked)
**  using the Atollic TrueSTUDIO(R) product. The use of this file together
**  with other tools than Atollic TrueSTUDIO(R) is not permitted.
**
*****************************************************************************
*/

/* Includes */
#include <stdarg.h>
#include <stdio.h>
#include <string.h>

/* Create aliases for *printf to integer variants *iprintf */
__attribute__ ((alias("iprintf"))) int printf(const char *fmt, ...);
__attribute__ ((alias("fiprintf"))) int fprintf(FILE* fp, const char *fmt, ...);
__attribute__ ((alias("siprintf"))) int sprintf(char* str, const char *fmt, ...);

/* External function prototypes (defined in syscalls.c) */
extern int _write(int fd, char *str, int len);

/* Private function prototypes */
void ts_itoa(char **buf, unsigned int d, int base);
int ts_formatstring(char *buf, const char *fmt, va_list va);
int ts_formatlength(const char *fmt, va_list va);

/* Private functions */

/**
**---------------------------------------------------------------------------
**  Abstract: Convert integer to ascii
**  Returns:  void
**---------------------------------------------------------------------------
*/
void ts_itoa(char **buf, unsigned int d, int base)