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STM32CubeWL/Utilities/misc/stm32_tiny_vsnprintf.c

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/**
Copyright (C) 2002 Michael Ringgaard. All rights reserved.
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 project 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 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.
*/
/**
******************************************************************************
* @file stm32_tiny_vsnprintf.c
* @author MCD Application Team
* @brief Tiny implementation of vsnprintf like function
******************************************************************************
* @attention
*
* Copyright (c) 2019 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/*
* Following implementation is adapted from original one
* https://github.com/jpbonn/coremark_lm32/blob/master/ee_printf.c
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32_tiny_vsnprintf.h"
/* Private typedef -----------------------------------------------------------*/
/* Private defines -----------------------------------------------------------*/
#define TINY_PRINTF
#define ZEROPAD (1<<0) /* Pad with zero */
#define SIGN (1<<1) /* Unsigned/signed long */
#define UPPERCASE (1<<6) /* 'ABCDEF' */
#ifdef TINY_PRINTF
#else
#define PLUS (1<<2) /* Show plus */
#define HEX_PREP (1<<5) /* 0x */
#define SPACE (1<<3) /* Spacer */
#define LEFT (1<<4) /* Left justified */
#endif
#define is_digit(c) ((c) >= '0' && (c) <= '9')
/* Private macros ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Global variables ----------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static char *lower_digits = "0123456789abcdefghijklmnopqrstuvwxyz";
static char *upper_digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
/* Functions Definition ------------------------------------------------------*/
#ifdef TINY_PRINTF
#else
static size_t strnlen(const char *s, size_t count);
static size_t strnlen(const char *s, size_t count)
{
const char *sc;
for (sc = s; *sc != '\0' && count--; ++sc);
return sc - s;
}
#endif
static int ee_skip_atoi(const char **s)
{
int i = 0;
while (is_digit(**s)) i = i*10 + *((*s)++) - '0';
return i;
}
#define ASSIGN_STR(_c) do { *str++ = (_c); max_size--; if (max_size == 0) return str; } while (0)
static char *ee_number(char *str, int max_size, long num, int base, int size, int precision, int type)
{
char c;
char sign, tmp[66];
char *dig = lower_digits;
int i;
if (type & UPPERCASE) dig = upper_digits;
#ifdef TINY_PRINTF
#else
if (type & LEFT) type &= ~ZEROPAD;
#endif
if (base < 2 || base > 36) return 0;
c = (type & ZEROPAD) ? '0' : ' ';
sign = 0;
if (type & SIGN)
{
if (num < 0)
{
sign = '-';
num = -num;
size--;
}
#ifdef TINY_PRINTF
#else
else if (type & PLUS)
{
sign = '+';
size--;
}
else if (type & SPACE)
{
sign = ' ';
size--;
}
#endif
}
#ifdef TINY_PRINTF
#else
if (type & HEX_PREP)
{
if (base == 16)
size -= 2;
else if (base == 8)
size--;
}
#endif
i = 0;
if (num == 0)
tmp[i++] = '0';
else
{
while (num != 0)
{
tmp[i++] = dig[((unsigned long) num) % (unsigned) base];
num = ((unsigned long) num) / (unsigned) base;
}
}
if (i > precision) precision = i;
size -= precision;
if (!(type & (ZEROPAD /* TINY option | LEFT */))) while (size-- > 0) ASSIGN_STR(' ');
if (sign) ASSIGN_STR(sign);
#ifdef TINY_PRINTF
#else
if (type & HEX_PREP)
{
if (base == 8)
ASSIGN_STR('0');
else if (base == 16)
{
ASSIGN_STR('0');
ASSIGN_STR(lower_digits[33]);
}
}
#endif
#ifdef TINY_PRINTF
while (size-- > 0) ASSIGN_STR(c);
#else
if (!(type & LEFT)) while (size-- > 0) ASSIGN_STR(c);
#endif
while (i < precision--) ASSIGN_STR('0');
while (i-- > 0) ASSIGN_STR(tmp[i]);
while (size-- > 0) ASSIGN_STR(' ');
return str;
}
#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;
for (i = 0; i < 6; i++)
{
if (i != 0) tmp[len++] = ':';
tmp[len++] = dig[addr[i] >> 4];
tmp[len++] = dig[addr[i] & 0x0F];
}
if (!(type & LEFT)) while (len < size--) *str++ = ' ';
for (i = 0; i < len; ++i) *str++ = tmp[i];
while (len < size--) *str++ = ' ';
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)
tmp[len++] = lower_digits[0];
else
{
if (n >= 100)
{
tmp[len++] = lower_digits[n / 100];
n = n % 100;
tmp[len++] = lower_digits[n / 10];
n = n % 10;
}
else if (n >= 10)
{
tmp[len++] = lower_digits[n / 10];
n = n % 10;
}
tmp[len++] = lower_digits[n];
}
}
if (!(type & LEFT)) while (len < size--) *str++ = ' ';
for (i = 0; i < len; ++i) *str++ = tmp[i];
while (len < size--) *str++ = ' ';
return str;
}
#endif
#ifdef HAS_FLOAT
char *ecvtbuf(double arg, int ndigits, int *decpt, int *sign, char *buf);
char *fcvtbuf(double arg, int ndigits, int *decpt, int *sign, char *buf);
static void ee_bufcpy(char *d, char *s, int count);
void ee_bufcpy(char *pd, char *ps, int count) {
char *pe=ps+count;
while (ps!=pe)
*pd++=*ps++;
}
static void parse_float(double value, char *buffer, char fmt, int precision)
{
int decpt, sign, exp, pos;
char *fdigits = NULL;
char cvtbuf[80];
int capexp = 0;
int magnitude;
if (fmt == 'G' || fmt == 'E')
{
capexp = 1;
fmt += 'a' - 'A';
}
if (fmt == 'g')
{
fdigits = ecvtbuf(value, precision, &decpt, &sign, cvtbuf);
magnitude = decpt - 1;
if (magnitude < -4 || magnitude > precision - 1)
{
fmt = 'e';
precision -= 1;
}
else
{
fmt = 'f';
precision -= decpt;
}
}
if (fmt == 'e')
{
fdigits = ecvtbuf(value, precision + 1, &decpt, &sign, cvtbuf);
if (sign) *buffer++ = '-';
*buffer++ = *fdigits;
if (precision > 0) *buffer++ = '.';
ee_bufcpy(buffer, fdigits + 1, precision);
buffer += precision;
*buffer++ = capexp ? 'E' : 'e';
if (decpt == 0)
{
if (value == 0.0)
exp = 0;
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;
}
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