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Utilities/misc/stm32_tiny_vsnprintf.c
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Utilities/misc/stm32_tiny_vsnprintf.c
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/**
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Copyright (C) 2002 Michael Ringgaard. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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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 project nor the names of its contributors
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||||
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 AND CONTRIBUTORS "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 OWNER OR CONTRIBUTORS 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.
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||||
*/
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/**
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******************************************************************************
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* @file stm32_tiny_vsnprintf.c
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* @author MCD Application Team
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* @brief Tiny implementation of vsnprintf like function
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******************************************************************************
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* @attention
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*
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||||
* Copyright (c) 2019 STMicroelectronics.
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||||
* All rights reserved.
|
||||
*
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||||
* This software is licensed under terms that can be found in the LICENSE file
|
||||
* in the root directory of this software component.
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||||
* If no LICENSE file comes with this software, it is provided AS-IS.
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||||
*
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||||
******************************************************************************
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||||
*/
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||||
/*
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* Following implementation is adapted from original one
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||||
* https://github.com/jpbonn/coremark_lm32/blob/master/ee_printf.c
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32_tiny_vsnprintf.h"
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/* Private typedef -----------------------------------------------------------*/
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/* Private defines -----------------------------------------------------------*/
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#define TINY_PRINTF
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#define ZEROPAD (1<<0) /* Pad with zero */
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#define SIGN (1<<1) /* Unsigned/signed long */
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#define UPPERCASE (1<<6) /* 'ABCDEF' */
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#ifdef TINY_PRINTF
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#else
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#define PLUS (1<<2) /* Show plus */
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#define HEX_PREP (1<<5) /* 0x */
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#define SPACE (1<<3) /* Spacer */
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#define LEFT (1<<4) /* Left justified */
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#endif
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#define is_digit(c) ((c) >= '0' && (c) <= '9')
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|
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/* Private macros ------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Global variables ----------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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|
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static char *lower_digits = "0123456789abcdefghijklmnopqrstuvwxyz";
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static char *upper_digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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|
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/* Functions Definition ------------------------------------------------------*/
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#ifdef TINY_PRINTF
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#else
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static size_t strnlen(const char *s, size_t count);
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static size_t strnlen(const char *s, size_t count)
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{
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const char *sc;
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for (sc = s; *sc != '\0' && count--; ++sc);
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return sc - s;
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}
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#endif
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static int ee_skip_atoi(const char **s)
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{
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int i = 0;
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while (is_digit(**s)) i = i*10 + *((*s)++) - '0';
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return i;
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}
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#define ASSIGN_STR(_c) do { *str++ = (_c); max_size--; if (max_size == 0) return str; } while (0)
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static char *ee_number(char *str, int max_size, long num, int base, int size, int precision, int type)
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{
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char c;
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char sign, tmp[66];
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char *dig = lower_digits;
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int i;
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if (type & UPPERCASE) dig = upper_digits;
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#ifdef TINY_PRINTF
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#else
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if (type & LEFT) type &= ~ZEROPAD;
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#endif
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if (base < 2 || base > 36) return 0;
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|
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c = (type & ZEROPAD) ? '0' : ' ';
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sign = 0;
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if (type & SIGN)
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{
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if (num < 0)
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{
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sign = '-';
|
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num = -num;
|
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size--;
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}
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#ifdef TINY_PRINTF
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#else
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else if (type & PLUS)
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{
|
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sign = '+';
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size--;
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}
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else if (type & SPACE)
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{
|
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sign = ' ';
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size--;
|
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}
|
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#endif
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}
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|
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#ifdef TINY_PRINTF
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#else
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if (type & HEX_PREP)
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{
|
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if (base == 16)
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size -= 2;
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else if (base == 8)
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size--;
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}
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#endif
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i = 0;
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|
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if (num == 0)
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tmp[i++] = '0';
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else
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{
|
||||
while (num != 0)
|
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{
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tmp[i++] = dig[((unsigned long) num) % (unsigned) base];
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num = ((unsigned long) num) / (unsigned) base;
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}
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}
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if (i > precision) precision = i;
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size -= precision;
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if (!(type & (ZEROPAD /* TINY option | LEFT */))) while (size-- > 0) ASSIGN_STR(' ');
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if (sign) ASSIGN_STR(sign);
|
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|
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#ifdef TINY_PRINTF
|
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#else
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if (type & HEX_PREP)
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{
|
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if (base == 8)
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ASSIGN_STR('0');
|
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else if (base == 16)
|
||||
{
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ASSIGN_STR('0');
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ASSIGN_STR(lower_digits[33]);
|
||||
}
|
||||
}
|
||||
#endif
|
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|
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#ifdef TINY_PRINTF
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while (size-- > 0) ASSIGN_STR(c);
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||||
#else
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if (!(type & LEFT)) while (size-- > 0) ASSIGN_STR(c);
|
||||
#endif
|
||||
while (i < precision--) ASSIGN_STR('0');
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||||
while (i-- > 0) ASSIGN_STR(tmp[i]);
|
||||
while (size-- > 0) ASSIGN_STR(' ');
|
||||
|
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return str;
|
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}
|
||||
|
||||
#ifdef TINY_PRINTF
|
||||
#else
|
||||
static char *eaddr(char *str, unsigned char *addr, int size, int precision, int type)
|
||||
{
|
||||
char tmp[24];
|
||||
char *dig = lower_digits;
|
||||
int i, len;
|
||||
|
||||
if (type & UPPERCASE) dig = upper_digits;
|
||||
len = 0;
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||||
for (i = 0; i < 6; i++)
|
||||
{
|
||||
if (i != 0) tmp[len++] = ':';
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tmp[len++] = dig[addr[i] >> 4];
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||||
tmp[len++] = dig[addr[i] & 0x0F];
|
||||
}
|
||||
|
||||
if (!(type & LEFT)) while (len < size--) *str++ = ' ';
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for (i = 0; i < len; ++i) *str++ = tmp[i];
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||||
while (len < size--) *str++ = ' ';
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||||
|
||||
return str;
|
||||
}
|
||||
|
||||
static char *iaddr(char *str, unsigned char *addr, int size, int precision, int type)
|
||||
{
|
||||
char tmp[24];
|
||||
int i, n, len;
|
||||
|
||||
len = 0;
|
||||
for (i = 0; i < 4; i++)
|
||||
{
|
||||
if (i != 0) tmp[len++] = '.';
|
||||
n = addr[i];
|
||||
|
||||
if (n == 0)
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tmp[len++] = lower_digits[0];
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else
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||||
{
|
||||
if (n >= 100)
|
||||
{
|
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tmp[len++] = lower_digits[n / 100];
|
||||
n = n % 100;
|
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tmp[len++] = lower_digits[n / 10];
|
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n = n % 10;
|
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}
|
||||
else if (n >= 10)
|
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{
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tmp[len++] = lower_digits[n / 10];
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||||
n = n % 10;
|
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}
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|
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tmp[len++] = lower_digits[n];
|
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}
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}
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|
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if (!(type & LEFT)) while (len < size--) *str++ = ' ';
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for (i = 0; i < len; ++i) *str++ = tmp[i];
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while (len < size--) *str++ = ' ';
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return str;
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}
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#endif
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|
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#ifdef HAS_FLOAT
|
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|
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char *ecvtbuf(double arg, int ndigits, int *decpt, int *sign, char *buf);
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char *fcvtbuf(double arg, int ndigits, int *decpt, int *sign, char *buf);
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static void ee_bufcpy(char *d, char *s, int count);
|
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|
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void ee_bufcpy(char *pd, char *ps, int count) {
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char *pe=ps+count;
|
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while (ps!=pe)
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*pd++=*ps++;
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}
|
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|
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static void parse_float(double value, char *buffer, char fmt, int precision)
|
||||
{
|
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int decpt, sign, exp, pos;
|
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char *fdigits = NULL;
|
||||
char cvtbuf[80];
|
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int capexp = 0;
|
||||
int magnitude;
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|
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if (fmt == 'G' || fmt == 'E')
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{
|
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capexp = 1;
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fmt += 'a' - 'A';
|
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}
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|
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if (fmt == 'g')
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{
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fdigits = ecvtbuf(value, precision, &decpt, &sign, cvtbuf);
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magnitude = decpt - 1;
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if (magnitude < -4 || magnitude > precision - 1)
|
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{
|
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fmt = 'e';
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precision -= 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
fmt = 'f';
|
||||
precision -= decpt;
|
||||
}
|
||||
}
|
||||
|
||||
if (fmt == 'e')
|
||||
{
|
||||
fdigits = ecvtbuf(value, precision + 1, &decpt, &sign, cvtbuf);
|
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|
||||
if (sign) *buffer++ = '-';
|
||||
*buffer++ = *fdigits;
|
||||
if (precision > 0) *buffer++ = '.';
|
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ee_bufcpy(buffer, fdigits + 1, precision);
|
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buffer += precision;
|
||||
*buffer++ = capexp ? 'E' : 'e';
|
||||
|
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if (decpt == 0)
|
||||
{
|
||||
if (value == 0.0)
|
||||
exp = 0;
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||||
else
|
||||
exp = -1;
|
||||
}
|
||||
else
|
||||
exp = decpt - 1;
|
||||
|
||||
if (exp < 0)
|
||||
{
|
||||
*buffer++ = '-';
|
||||
exp = -exp;
|
||||
}
|
||||
else
|
||||
*buffer++ = '+';
|
||||
|
||||
buffer[2] = (exp % 10) + '0';
|
||||
exp = exp / 10;
|
||||
buffer[1] = (exp % 10) + '0';
|
||||
exp = exp / 10;
|
||||
buffer[0] = (exp % 10) + '0';
|
||||
buffer += 3;
|
||||
}
|
||||
else if (fmt == 'f')
|
||||
{
|
||||
fdigits = fcvtbuf(value, precision, &decpt, &sign, cvtbuf);
|
||||
if (sign) *buffer++ = '-';
|
||||
if (*fdigits)
|
||||
{
|
||||
if (decpt <= 0)
|
||||
{
|
||||
*buffer++ = '0';
|
||||
*buffer++ = '.';
|
||||
for (pos = 0; pos < -decpt; pos++) *buffer++ = '0';
|
||||
while (*fdigits) *buffer++ = *fdigits++;
|
||||
}
|
||||
else
|
||||
{
|
||||
pos = 0;
|
||||
while (*fdigits)
|
||||
{
|
||||
if (pos++ == decpt) *buffer++ = '.';
|
||||
*buffer++ = *fdigits++;
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
*buffer++ = '0';
|
||||
if (precision > 0)
|
||||
{
|
||||
*buffer++ = '.';
|
||||
for (pos = 0; pos < precision; pos++) *buffer++ = '0';
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
*buffer = '\0';
|
||||
}
|
||||
|
||||
static void decimal_point(char *buffer)
|
||||
{
|
||||
while (*buffer)
|
||||
{
|
||||
if (*buffer == '.') return;
|
||||
if (*buffer == 'e' || *buffer == 'E') break;
|
||||
buffer++;
|
||||
}
|
||||
|
||||
if (*buffer)
|
||||
{
|
||||
int n = strnlen(buffer,256);
|
||||
while (n > 0)
|
||||
{
|
||||
buffer[n + 1] = buffer[n];
|
||||
n--;
|
||||
}
|
||||
|
||||
*buffer = '.';
|
||||
}
|
||||
else
|
||||
{
|
||||
*buffer++ = '.';
|
||||
*buffer = '\0';
|
||||
}
|
||||
}
|
||||
|
||||
static void cropzeros(char *buffer)
|
||||
{
|
||||
char *stop;
|
||||
|
||||
while (*buffer && *buffer != '.') buffer++;
|
||||
if (*buffer++)
|
||||
{
|
||||
while (*buffer && *buffer != 'e' && *buffer != 'E') buffer++;
|
||||
stop = buffer--;
|
||||
while (*buffer == '0') buffer--;
|
||||
if (*buffer == '.') buffer--;
|
||||
while (buffer!=stop)
|
||||
*++buffer=0;
|
||||
}
|
||||
}
|
||||
|
||||
static char *flt(char *str, double num, int size, int precision, char fmt, int flags)
|
||||
{
|
||||
char tmp[80];
|
||||
char c, sign;
|
||||
int n, i;
|
||||
|
||||
// Left align means no zero padding
|
||||
#ifdef TINY_PRINTF
|
||||
#else
|
||||
if (flags & LEFT) flags &= ~ZEROPAD;
|
||||
#endif
|
||||
|
||||
// Determine padding and sign char
|
||||
c = (flags & ZEROPAD) ? '0' : ' ';
|
||||
sign = 0;
|
||||
if (flags & SIGN)
|
||||
{
|
||||
if (num < 0.0)
|
||||
{
|
||||
sign = '-';
|
||||
num = -num;
|
||||
size--;
|
||||
}
|
||||
#ifdef TINY_PRINTF
|
||||
#else
|
||||
else if (flags & PLUS)
|
||||
{
|
||||
sign = '+';
|
||||
size--;
|
||||
}
|
||||
else if (flags & SPACE)
|
||||
{
|
||||
sign = ' ';
|
||||
size--;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
// Compute the precision value
|
||||
if (precision < 0)
|
||||
precision = 6; // Default precision: 6
|
||||
|
||||
// Convert floating point number to text
|
||||
parse_float(num, tmp, fmt, precision);
|
||||
|
||||
#ifdef TINY_PRINTF
|
||||
#else
|
||||
if ((flags & HEX_PREP) && precision == 0) decimal_point(tmp);
|
||||
#endif
|
||||
if (fmt == 'g' && !(flags & HEX_PREP)) cropzeros(tmp);
|
||||
|
||||
n = strnlen(tmp,256);
|
||||
|
||||
// Output number with alignment and padding
|
||||
size -= n;
|
||||
if (!(flags & (ZEROPAD | LEFT))) while (size-- > 0) *str++ = ' ';
|
||||
if (sign) *str++ = sign;
|
||||
if (!(flags & LEFT)) while (size-- > 0) *str++ = c;
|
||||
for (i = 0; i < n; i++) *str++ = tmp[i];
|
||||
while (size-- > 0) *str++ = ' ';
|
||||
|
||||
return str;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#define CHECK_STR_SIZE(_buf, _str, _size) \
|
||||
if ((((_str) - (_buf)) >= ((_size)-1))) { break; }
|
||||
|
||||
int tiny_vsnprintf_like(char *buf, const int size, const char *fmt, va_list args)
|
||||
{
|
||||
unsigned long num;
|
||||
int base;
|
||||
char *str;
|
||||
int len;
|
||||
int i;
|
||||
char *s;
|
||||
|
||||
int flags; // Flags to number()
|
||||
|
||||
int field_width; // Width of output field
|
||||
int precision; // Min. # of digits for integers; max number of chars for from string
|
||||
int qualifier; // 'h', 'l', or 'L' for integer fields
|
||||
|
||||
if (size <= 0)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
for (str = buf; *fmt || ((str - buf) >= size-1); fmt++)
|
||||
{
|
||||
CHECK_STR_SIZE(buf, str, size);
|
||||
|
||||
if (*fmt != '%')
|
||||
{
|
||||
*str++ = *fmt;
|
||||
continue;
|
||||
}
|
||||
|
||||
// Process flags
|
||||
flags = 0;
|
||||
#ifdef TINY_PRINTF
|
||||
/* Support %0, but not %-, %+, %space and %# */
|
||||
fmt++;
|
||||
if (*fmt == '0')
|
||||
{
|
||||
flags |= ZEROPAD;
|
||||
}
|
||||
#else
|
||||
repeat:
|
||||
fmt++; // This also skips first '%'
|
||||
switch (*fmt)
|
||||
{
|
||||
case '-': flags |= LEFT; goto repeat;
|
||||
case '+': flags |= PLUS; goto repeat;
|
||||
case ' ': flags |= SPACE; goto repeat;
|
||||
case '#': flags |= HEX_PREP; goto repeat;
|
||||
case '0': flags |= ZEROPAD; goto repeat;
|
||||
}
|
||||
#endif
|
||||
|
||||
// Get field width
|
||||
field_width = -1;
|
||||
if (is_digit(*fmt))
|
||||
field_width = ee_skip_atoi(&fmt);
|
||||
#ifdef TINY_PRINTF
|
||||
/* Does not support %* */
|
||||
#else
|
||||
else if (*fmt == '*')
|
||||
{
|
||||
fmt++;
|
||||
field_width = va_arg(args, int);
|
||||
if (field_width < 0)
|
||||
{
|
||||
field_width = -field_width;
|
||||
flags |= LEFT;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
// Get the precision
|
||||
precision = -1;
|
||||
#ifdef TINY_PRINTF
|
||||
/* Does not support %. */
|
||||
#else
|
||||
if (*fmt == '.')
|
||||
{
|
||||
++fmt;
|
||||
if (is_digit(*fmt))
|
||||
precision = ee_skip_atoi(&fmt);
|
||||
else if (*fmt == '*')
|
||||
{
|
||||
++fmt;
|
||||
precision = va_arg(args, int);
|
||||
}
|
||||
if (precision < 0) precision = 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
// Get the conversion qualifier
|
||||
qualifier = -1;
|
||||
#ifdef TINY_PRINTF
|
||||
/* Does not support %l and %L */
|
||||
#else
|
||||
if (*fmt == 'l' || *fmt == 'L')
|
||||
{
|
||||
qualifier = *fmt;
|
||||
fmt++;
|
||||
}
|
||||
#endif
|
||||
|
||||
// Default base
|
||||
base = 10;
|
||||
|
||||
switch (*fmt)
|
||||
{
|
||||
case 'c':
|
||||
#ifdef TINY_PRINTF
|
||||
#else
|
||||
if (!(flags & LEFT))
|
||||
#endif
|
||||
while (--field_width > 0) *str++ = ' ';
|
||||
*str++ = (unsigned char) va_arg(args, int);
|
||||
#ifdef TINY_PRINTF
|
||||
#else
|
||||
while (--field_width > 0) *str++ = ' ';
|
||||
#endif
|
||||
continue;
|
||||
|
||||
case 's':
|
||||
s = va_arg(args, char *);
|
||||
if (!s) s = "<NULL>";
|
||||
#ifdef TINY_PRINTF
|
||||
len = strlen(s);
|
||||
#else
|
||||
len = strnlen(s, precision);
|
||||
if (!(flags & LEFT))
|
||||
#endif
|
||||
while (len < field_width--) *str++ = ' ';
|
||||
for (i = 0; i < len; ++i) *str++ = *s++;
|
||||
#ifdef TINY_PRINTF
|
||||
#else
|
||||
while (len < field_width--) *str++ = ' ';
|
||||
#endif
|
||||
continue;
|
||||
|
||||
#ifdef TINY_PRINTF
|
||||
/* Does not support %p, %A, %a, %o */
|
||||
#else
|
||||
case 'p':
|
||||
if (field_width == -1)
|
||||
{
|
||||
field_width = 2 * sizeof(void *);
|
||||
flags |= ZEROPAD;
|
||||
}
|
||||
str = ee_number(str, (size - (str - buf)), (unsigned long) va_arg(args, void *), 16, field_width, precision, flags);
|
||||
continue;
|
||||
|
||||
case 'A':
|
||||
flags |= UPPERCASE;
|
||||
|
||||
case 'a':
|
||||
if (qualifier == 'l')
|
||||
str = eaddr(str, va_arg(args, unsigned char *), field_width, precision, flags);
|
||||
else
|
||||
str = iaddr(str, va_arg(args, unsigned char *), field_width, precision, flags);
|
||||
continue;
|
||||
|
||||
// Integer number formats - set up the flags and "break"
|
||||
case 'o':
|
||||
base = 8;
|
||||
break;
|
||||
#endif
|
||||
|
||||
case 'X':
|
||||
flags |= UPPERCASE;
|
||||
|
||||
case 'x':
|
||||
base = 16;
|
||||
break;
|
||||
|
||||
case 'd':
|
||||
case 'i':
|
||||
flags |= SIGN;
|
||||
|
||||
case 'u':
|
||||
break;
|
||||
|
||||
#ifdef HAS_FLOAT
|
||||
|
||||
case 'f':
|
||||
str = flt(str, va_arg(args, double), field_width, precision, *fmt, flags | SIGN);
|
||||
continue;
|
||||
|
||||
#endif
|
||||
|
||||
default:
|
||||
if (*fmt != '%') *str++ = '%';
|
||||
CHECK_STR_SIZE(buf, str, size);
|
||||
if (*fmt)
|
||||
*str++ = *fmt;
|
||||
else
|
||||
--fmt;
|
||||
CHECK_STR_SIZE(buf, str, size);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (qualifier == 'l')
|
||||
num = va_arg(args, unsigned long);
|
||||
else if (flags & SIGN)
|
||||
num = va_arg(args, int);
|
||||
else
|
||||
num = va_arg(args, unsigned int);
|
||||
|
||||
str = ee_number(str, ((size - 1) - (str - buf)), num, base, field_width, precision, flags);
|
||||
}
|
||||
|
||||
*str = '\0';
|
||||
return str - buf;
|
||||
}
|
||||
Reference in New Issue
Block a user