670 lines
14 KiB
C
670 lines
14 KiB
C
/******************************************************************************
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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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* <h2><center>© Copyright (c) 2019 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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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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/* 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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static char *lower_digits = "0123456789abcdefghijklmnopqrstuvwxyz";
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static char *upper_digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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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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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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#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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if (num == 0)
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tmp[i++] = '0';
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else
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{
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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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#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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{
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ASSIGN_STR('0');
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ASSIGN_STR(lower_digits[33]);
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}
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}
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#endif
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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);
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#endif
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while (i < precision--) ASSIGN_STR('0');
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while (i-- > 0) ASSIGN_STR(tmp[i]);
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while (size-- > 0) ASSIGN_STR(' ');
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return str;
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}
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#ifdef TINY_PRINTF
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#else
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static char *eaddr(char *str, unsigned char *addr, int size, int precision, int type)
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{
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char tmp[24];
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char *dig = lower_digits;
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int i, len;
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if (type & UPPERCASE) dig = upper_digits;
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len = 0;
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for (i = 0; i < 6; i++)
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{
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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];
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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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static char *iaddr(char *str, unsigned char *addr, int size, int precision, int type)
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{
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char tmp[24];
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int i, n, len;
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len = 0;
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for (i = 0; i < 4; i++)
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{
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if (i != 0) tmp[len++] = '.';
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n = addr[i];
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if (n == 0)
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tmp[len++] = lower_digits[0];
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else
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{
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if (n >= 100)
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{
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tmp[len++] = lower_digits[n / 100];
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n = n % 100;
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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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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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tmp[len++] = lower_digits[n];
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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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#ifdef HAS_FLOAT
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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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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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static void parse_float(double value, char *buffer, char fmt, int precision)
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{
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int decpt, sign, exp, pos;
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char *fdigits = NULL;
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char cvtbuf[80];
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int capexp = 0;
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int magnitude;
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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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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;
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}
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else
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{
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fmt = 'f';
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precision -= decpt;
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}
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}
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if (fmt == 'e')
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{
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fdigits = ecvtbuf(value, precision + 1, &decpt, &sign, cvtbuf);
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if (sign) *buffer++ = '-';
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*buffer++ = *fdigits;
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if (precision > 0) *buffer++ = '.';
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ee_bufcpy(buffer, fdigits + 1, precision);
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buffer += precision;
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*buffer++ = capexp ? 'E' : 'e';
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if (decpt == 0)
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{
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if (value == 0.0)
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exp = 0;
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else
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exp = -1;
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}
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else
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exp = decpt - 1;
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if (exp < 0)
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{
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*buffer++ = '-';
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exp = -exp;
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}
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else
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*buffer++ = '+';
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buffer[2] = (exp % 10) + '0';
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exp = exp / 10;
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buffer[1] = (exp % 10) + '0';
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exp = exp / 10;
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buffer[0] = (exp % 10) + '0';
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buffer += 3;
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}
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else if (fmt == 'f')
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{
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fdigits = fcvtbuf(value, precision, &decpt, &sign, cvtbuf);
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if (sign) *buffer++ = '-';
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if (*fdigits)
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{
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if (decpt <= 0)
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{
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*buffer++ = '0';
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*buffer++ = '.';
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for (pos = 0; pos < -decpt; pos++) *buffer++ = '0';
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while (*fdigits) *buffer++ = *fdigits++;
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}
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else
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{
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pos = 0;
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while (*fdigits)
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{
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if (pos++ == decpt) *buffer++ = '.';
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*buffer++ = *fdigits++;
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}
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}
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}
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else
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{
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*buffer++ = '0';
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if (precision > 0)
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{
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*buffer++ = '.';
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for (pos = 0; pos < precision; pos++) *buffer++ = '0';
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}
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}
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}
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*buffer = '\0';
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}
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static void decimal_point(char *buffer)
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{
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while (*buffer)
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{
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if (*buffer == '.') return;
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if (*buffer == 'e' || *buffer == 'E') break;
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buffer++;
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}
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if (*buffer)
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{
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int n = strnlen(buffer,256);
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while (n > 0)
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{
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buffer[n + 1] = buffer[n];
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n--;
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}
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*buffer = '.';
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}
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else
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{
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*buffer++ = '.';
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*buffer = '\0';
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}
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}
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static void cropzeros(char *buffer)
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{
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char *stop;
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while (*buffer && *buffer != '.') buffer++;
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if (*buffer++)
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{
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while (*buffer && *buffer != 'e' && *buffer != 'E') buffer++;
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stop = buffer--;
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while (*buffer == '0') buffer--;
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if (*buffer == '.') buffer--;
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while (buffer!=stop)
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*++buffer=0;
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}
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}
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static char *flt(char *str, double num, int size, int precision, char fmt, int flags)
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{
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char tmp[80];
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char c, sign;
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int n, i;
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// Left align means no zero padding
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#ifdef TINY_PRINTF
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#else
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if (flags & LEFT) flags &= ~ZEROPAD;
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#endif
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// Determine padding and sign char
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c = (flags & ZEROPAD) ? '0' : ' ';
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sign = 0;
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if (flags & SIGN)
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{
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if (num < 0.0)
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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 (flags & 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 (flags & 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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// Compute the precision value
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if (precision < 0)
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precision = 6; // Default precision: 6
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// Convert floating point number to text
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parse_float(num, tmp, fmt, precision);
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#ifdef TINY_PRINTF
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#else
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if ((flags & HEX_PREP) && precision == 0) decimal_point(tmp);
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#endif
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if (fmt == 'g' && !(flags & HEX_PREP)) cropzeros(tmp);
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n = strnlen(tmp,256);
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// Output number with alignment and padding
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size -= n;
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if (!(flags & (ZEROPAD | LEFT))) while (size-- > 0) *str++ = ' ';
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if (sign) *str++ = sign;
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if (!(flags & LEFT)) while (size-- > 0) *str++ = c;
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for (i = 0; i < n; i++) *str++ = tmp[i];
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while (size-- > 0) *str++ = ' ';
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return str;
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}
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#endif
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#define CHECK_STR_SIZE(_buf, _str, _size) \
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if ((((_str) - (_buf)) >= ((_size)-1))) { break; }
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int tiny_vsnprintf_like(char *buf, const int size, const char *fmt, va_list args)
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{
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unsigned long num;
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int base;
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char *str;
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int len;
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int i;
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char *s;
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int flags; // Flags to number()
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int field_width; // Width of output field
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int precision; // Min. # of digits for integers; max number of chars for from string
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int qualifier; // 'h', 'l', or 'L' for integer fields
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if (size <= 0)
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{
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return 0;
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}
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for (str = buf; *fmt || ((str - buf) >= size-1); fmt++)
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{
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CHECK_STR_SIZE(buf, str, size);
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if (*fmt != '%')
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{
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*str++ = *fmt;
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continue;
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}
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// Process flags
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flags = 0;
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#ifdef TINY_PRINTF
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/* Support %0, but not %-, %+, %space and %# */
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fmt++;
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if (*fmt == '0')
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{
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flags |= ZEROPAD;
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}
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#else
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repeat:
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fmt++; // This also skips first '%'
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switch (*fmt)
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{
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case '-': flags |= LEFT; goto repeat;
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case '+': flags |= PLUS; goto repeat;
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case ' ': flags |= SPACE; goto repeat;
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case '#': flags |= HEX_PREP; goto repeat;
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case '0': flags |= ZEROPAD; goto repeat;
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}
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#endif
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// Get field width
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field_width = -1;
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if (is_digit(*fmt))
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field_width = ee_skip_atoi(&fmt);
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#ifdef TINY_PRINTF
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/* Does not support %* */
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#else
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else if (*fmt == '*')
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{
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fmt++;
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field_width = va_arg(args, int);
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if (field_width < 0)
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{
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field_width = -field_width;
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flags |= LEFT;
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}
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}
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#endif
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// Get the precision
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precision = -1;
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#ifdef TINY_PRINTF
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/* Does not support %. */
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#else
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if (*fmt == '.')
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{
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++fmt;
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if (is_digit(*fmt))
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precision = ee_skip_atoi(&fmt);
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else if (*fmt == '*')
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{
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++fmt;
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precision = va_arg(args, int);
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}
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if (precision < 0) precision = 0;
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}
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#endif
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// Get the conversion qualifier
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qualifier = -1;
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#ifdef TINY_PRINTF
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/* Does not support %l and %L */
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#else
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if (*fmt == 'l' || *fmt == 'L')
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{
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qualifier = *fmt;
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fmt++;
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}
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#endif
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// Default base
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base = 10;
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switch (*fmt)
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{
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case 'c':
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#ifdef TINY_PRINTF
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#else
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if (!(flags & LEFT))
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#endif
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while (--field_width > 0) *str++ = ' ';
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*str++ = (unsigned char) va_arg(args, int);
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#ifdef TINY_PRINTF
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#else
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while (--field_width > 0) *str++ = ' ';
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#endif
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continue;
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case 's':
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s = va_arg(args, char *);
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if (!s) s = "<NULL>";
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#ifdef TINY_PRINTF
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len = strlen(s);
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#else
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len = strnlen(s, precision);
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if (!(flags & LEFT))
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#endif
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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;
|
|
}
|
|
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
|