| /////////////////////////////////////////////////////////////////////////////// |
| // \author (c) Marco Paland (info@paland.com) |
| // 2014-2019, PALANDesign Hannover, Germany |
| // |
| // \license The MIT License (MIT) |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a copy |
| // of this software and associated documentation files (the "Software"), to deal |
| // in the Software without restriction, including without limitation the rights |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| // copies of the Software, and to permit persons to whom the Software is |
| // furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included in |
| // all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| // THE SOFTWARE. |
| // |
| // \brief Tiny printf, sprintf and (v)snprintf implementation, optimized for speed on |
| // embedded systems with a very limited resources. These routines are thread |
| // safe and reentrant! |
| // Use this instead of the bloated standard/newlib printf cause these use |
| // malloc for printf (and may not be thread safe). |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| |
| #include "pico.h" |
| #include "pico/printf.h" |
| |
| // PICO_CONFIG: PICO_PRINTF_NTOA_BUFFER_SIZE, Define printf ntoa buffer size, min=0, max=128, default=32, group=pico_printf |
| // 'ntoa' conversion buffer size, this must be big enough to hold one converted |
| // numeric number including padded zeros (dynamically created on stack) |
| #ifndef PICO_PRINTF_NTOA_BUFFER_SIZE |
| #define PICO_PRINTF_NTOA_BUFFER_SIZE 32U |
| #endif |
| |
| // PICO_CONFIG: PICO_PRINTF_FTOA_BUFFER_SIZE, Define printf ftoa buffer size, min=0, max=128, default=32, group=pico_printf |
| // 'ftoa' conversion buffer size, this must be big enough to hold one converted |
| // float number including padded zeros (dynamically created on stack) |
| #ifndef PICO_PRINTF_FTOA_BUFFER_SIZE |
| #define PICO_PRINTF_FTOA_BUFFER_SIZE 32U |
| #endif |
| |
| // PICO_CONFIG: PICO_PRINTF_SUPPORT_FLOAT, Enable floating point printing, type=bool, default=1, group=pico_printf |
| // support for the floating point type (%f) |
| #ifndef PICO_PRINTF_SUPPORT_FLOAT |
| #define PICO_PRINTF_SUPPORT_FLOAT 1 |
| #endif |
| |
| // PICO_CONFIG: PICO_PRINTF_SUPPORT_EXPONENTIAL, Enable exponential floating point printing, type=bool, default=1, group=pico_printf |
| // support for exponential floating point notation (%e/%g) |
| #ifndef PICO_PRINTF_SUPPORT_EXPONENTIAL |
| #define PICO_PRINTF_SUPPORT_EXPONENTIAL 1 |
| #endif |
| |
| // PICO_CONFIG: PICO_PRINTF_DEFAULT_FLOAT_PRECISION, Define default floating point precision, min=1, max=16, default=6, group=pico_printf |
| #ifndef PICO_PRINTF_DEFAULT_FLOAT_PRECISION |
| #define PICO_PRINTF_DEFAULT_FLOAT_PRECISION 6U |
| #endif |
| |
| // PICO_CONFIG: PICO_PRINTF_MAX_FLOAT, Define the largest float suitable to print with %f, min=1, max=1e9, default=1e9, group=pico_printf |
| #ifndef PICO_PRINTF_MAX_FLOAT |
| #define PICO_PRINTF_MAX_FLOAT 1e9 |
| #endif |
| |
| // PICO_CONFIG: PICO_PRINTF_SUPPORT_LONG_LONG, Enable support for long long types (%llu or %p), type=bool, default=1, group=pico_printf |
| #ifndef PICO_PRINTF_SUPPORT_LONG_LONG |
| #define PICO_PRINTF_SUPPORT_LONG_LONG 1 |
| #endif |
| |
| // PICO_CONFIG: PICO_PRINTF_SUPPORT_PTRDIFF_T, Enable support for the ptrdiff_t type (%t), type=bool, default=1, group=pico_printf |
| // ptrdiff_t is normally defined in <stddef.h> as long or long long type |
| #ifndef PICO_PRINTF_SUPPORT_PTRDIFF_T |
| #define PICO_PRINTF_SUPPORT_PTRDIFF_T 1 |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| // internal flag definitions |
| #define FLAGS_ZEROPAD (1U << 0U) |
| #define FLAGS_LEFT (1U << 1U) |
| #define FLAGS_PLUS (1U << 2U) |
| #define FLAGS_SPACE (1U << 3U) |
| #define FLAGS_HASH (1U << 4U) |
| #define FLAGS_UPPERCASE (1U << 5U) |
| #define FLAGS_CHAR (1U << 6U) |
| #define FLAGS_SHORT (1U << 7U) |
| #define FLAGS_LONG (1U << 8U) |
| #define FLAGS_LONG_LONG (1U << 9U) |
| #define FLAGS_PRECISION (1U << 10U) |
| #define FLAGS_ADAPT_EXP (1U << 11U) |
| |
| // import float.h for DBL_MAX |
| #if PICO_PRINTF_SUPPORT_FLOAT |
| |
| #include <float.h> |
| |
| #endif |
| |
| // output function type |
| typedef void (*out_fct_type)(char character, void *buffer, size_t idx, size_t maxlen); |
| |
| #if !PICO_PRINTF_ALWAYS_INCLUDED |
| // we don't have a way to specify a truly weak symbol reference (the linker will always include targets in a single link step, |
| // so we make a function pointer that is initialized on the first printf called... if printf is not included in the binary |
| // (or has never been called - we can't tell) then this will be null. the assumption is that if you are using printf |
| // you are likely to have printed something. |
| static int (*lazy_vsnprintf)(out_fct_type out, char *buffer, const size_t maxlen, const char *format, va_list va); |
| #endif |
| |
| // wrapper (used as buffer) for output function type |
| typedef struct { |
| void (*fct)(char character, void *arg); |
| void *arg; |
| } out_fct_wrap_type; |
| |
| // internal buffer output |
| static inline void _out_buffer(char character, void *buffer, size_t idx, size_t maxlen) { |
| if (idx < maxlen) { |
| ((char *) buffer)[idx] = character; |
| } |
| } |
| |
| // internal null output |
| static inline void _out_null(char character, void *buffer, size_t idx, size_t maxlen) { |
| (void) character; |
| (void) buffer; |
| (void) idx; |
| (void) maxlen; |
| } |
| |
| // internal output function wrapper |
| static inline void _out_fct(char character, void *buffer, size_t idx, size_t maxlen) { |
| (void) idx; |
| (void) maxlen; |
| if (character) { |
| // buffer is the output fct pointer |
| ((out_fct_wrap_type *) buffer)->fct(character, ((out_fct_wrap_type *) buffer)->arg); |
| } |
| } |
| |
| |
| // internal secure strlen |
| // \return The length of the string (excluding the terminating 0) limited by 'maxsize' |
| static inline unsigned int _strnlen_s(const char *str, size_t maxsize) { |
| const char *s; |
| for (s = str; *s && maxsize--; ++s); |
| return (unsigned int) (s - str); |
| } |
| |
| |
| // internal test if char is a digit (0-9) |
| // \return true if char is a digit |
| static inline bool _is_digit(char ch) { |
| return (ch >= '0') && (ch <= '9'); |
| } |
| |
| |
| // internal ASCII string to unsigned int conversion |
| static unsigned int _atoi(const char **str) { |
| unsigned int i = 0U; |
| while (_is_digit(**str)) { |
| i = i * 10U + (unsigned int) (*((*str)++) - '0'); |
| } |
| return i; |
| } |
| |
| |
| // output the specified string in reverse, taking care of any zero-padding |
| static size_t _out_rev(out_fct_type out, char *buffer, size_t idx, size_t maxlen, const char *buf, size_t len, |
| unsigned int width, unsigned int flags) { |
| const size_t start_idx = idx; |
| |
| // pad spaces up to given width |
| if (!(flags & FLAGS_LEFT) && !(flags & FLAGS_ZEROPAD)) { |
| for (size_t i = len; i < width; i++) { |
| out(' ', buffer, idx++, maxlen); |
| } |
| } |
| |
| // reverse string |
| while (len) { |
| out(buf[--len], buffer, idx++, maxlen); |
| } |
| |
| // append pad spaces up to given width |
| if (flags & FLAGS_LEFT) { |
| while (idx - start_idx < width) { |
| out(' ', buffer, idx++, maxlen); |
| } |
| } |
| |
| return idx; |
| } |
| |
| |
| // internal itoa format |
| static size_t _ntoa_format(out_fct_type out, char *buffer, size_t idx, size_t maxlen, char *buf, size_t len, |
| bool negative, unsigned int base, unsigned int prec, unsigned int width, |
| unsigned int flags) { |
| // pad leading zeros |
| if (!(flags & FLAGS_LEFT)) { |
| if (width && (flags & FLAGS_ZEROPAD) && (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) { |
| width--; |
| } |
| while ((len < prec) && (len < PICO_PRINTF_NTOA_BUFFER_SIZE)) { |
| buf[len++] = '0'; |
| } |
| while ((flags & FLAGS_ZEROPAD) && (len < width) && (len < PICO_PRINTF_NTOA_BUFFER_SIZE)) { |
| buf[len++] = '0'; |
| } |
| } |
| |
| // handle hash |
| if (flags & FLAGS_HASH) { |
| if (!(flags & FLAGS_PRECISION) && len && ((len == prec) || (len == width))) { |
| len--; |
| if (len && (base == 16U)) { |
| len--; |
| } |
| } |
| if ((base == 16U) && !(flags & FLAGS_UPPERCASE) && (len < PICO_PRINTF_NTOA_BUFFER_SIZE)) { |
| buf[len++] = 'x'; |
| } else if ((base == 16U) && (flags & FLAGS_UPPERCASE) && (len < PICO_PRINTF_NTOA_BUFFER_SIZE)) { |
| buf[len++] = 'X'; |
| } else if ((base == 2U) && (len < PICO_PRINTF_NTOA_BUFFER_SIZE)) { |
| buf[len++] = 'b'; |
| } |
| if (len < PICO_PRINTF_NTOA_BUFFER_SIZE) { |
| buf[len++] = '0'; |
| } |
| } |
| |
| if (len < PICO_PRINTF_NTOA_BUFFER_SIZE) { |
| if (negative) { |
| buf[len++] = '-'; |
| } else if (flags & FLAGS_PLUS) { |
| buf[len++] = '+'; // ignore the space if the '+' exists |
| } else if (flags & FLAGS_SPACE) { |
| buf[len++] = ' '; |
| } |
| } |
| |
| return _out_rev(out, buffer, idx, maxlen, buf, len, width, flags); |
| } |
| |
| |
| // internal itoa for 'long' type |
| static size_t _ntoa_long(out_fct_type out, char *buffer, size_t idx, size_t maxlen, unsigned long value, bool negative, |
| unsigned long base, unsigned int prec, unsigned int width, unsigned int flags) { |
| char buf[PICO_PRINTF_NTOA_BUFFER_SIZE]; |
| size_t len = 0U; |
| |
| // no hash for 0 values |
| if (!value) { |
| flags &= ~FLAGS_HASH; |
| } |
| |
| // write if precision != 0 and value is != 0 |
| if (!(flags & FLAGS_PRECISION) || value) { |
| do { |
| const char digit = (char) (value % base); |
| buf[len++] = (char)(digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10); |
| value /= base; |
| } while (value && (len < PICO_PRINTF_NTOA_BUFFER_SIZE)); |
| } |
| |
| return _ntoa_format(out, buffer, idx, maxlen, buf, len, negative, (unsigned int) base, prec, width, flags); |
| } |
| |
| |
| // internal itoa for 'long long' type |
| #if PICO_PRINTF_SUPPORT_LONG_LONG |
| |
| static size_t _ntoa_long_long(out_fct_type out, char *buffer, size_t idx, size_t maxlen, unsigned long long value, |
| bool negative, unsigned long long base, unsigned int prec, unsigned int width, |
| unsigned int flags) { |
| char buf[PICO_PRINTF_NTOA_BUFFER_SIZE]; |
| size_t len = 0U; |
| |
| // no hash for 0 values |
| if (!value) { |
| flags &= ~FLAGS_HASH; |
| } |
| |
| // write if precision != 0 and value is != 0 |
| if (!(flags & FLAGS_PRECISION) || value) { |
| do { |
| const char digit = (char) (value % base); |
| buf[len++] = (char)(digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10); |
| value /= base; |
| } while (value && (len < PICO_PRINTF_NTOA_BUFFER_SIZE)); |
| } |
| |
| return _ntoa_format(out, buffer, idx, maxlen, buf, len, negative, (unsigned int) base, prec, width, flags); |
| } |
| |
| #endif // PICO_PRINTF_SUPPORT_LONG_LONG |
| |
| |
| #if PICO_PRINTF_SUPPORT_FLOAT |
| |
| #if PICO_PRINTF_SUPPORT_EXPONENTIAL |
| // forward declaration so that _ftoa can switch to exp notation for values > PICO_PRINTF_MAX_FLOAT |
| static size_t _etoa(out_fct_type out, char *buffer, size_t idx, size_t maxlen, double value, unsigned int prec, |
| unsigned int width, unsigned int flags); |
| #endif |
| |
| #define is_nan __builtin_isnan |
| |
| // internal ftoa for fixed decimal floating point |
| static size_t _ftoa(out_fct_type out, char *buffer, size_t idx, size_t maxlen, double value, unsigned int prec, |
| unsigned int width, unsigned int flags) { |
| char buf[PICO_PRINTF_FTOA_BUFFER_SIZE]; |
| size_t len = 0U; |
| double diff = 0.0; |
| |
| // powers of 10 |
| static const double pow10[] = {1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000}; |
| |
| // test for special values |
| if (is_nan(value)) |
| return _out_rev(out, buffer, idx, maxlen, "nan", 3, width, flags); |
| if (value < -DBL_MAX) |
| return _out_rev(out, buffer, idx, maxlen, "fni-", 4, width, flags); |
| if (value > DBL_MAX) |
| return _out_rev(out, buffer, idx, maxlen, (flags & FLAGS_PLUS) ? "fni+" : "fni", (flags & FLAGS_PLUS) ? 4U : 3U, |
| width, flags); |
| |
| // test for very large values |
| // standard printf behavior is to print EVERY whole number digit -- which could be 100s of characters overflowing your buffers == bad |
| if ((value > PICO_PRINTF_MAX_FLOAT) || (value < -PICO_PRINTF_MAX_FLOAT)) { |
| #if PICO_PRINTF_SUPPORT_EXPONENTIAL |
| return _etoa(out, buffer, idx, maxlen, value, prec, width, flags); |
| #else |
| return 0U; |
| #endif |
| } |
| |
| // test for negative |
| bool negative = false; |
| if (value < 0) { |
| negative = true; |
| value = 0 - value; |
| } |
| |
| // set default precision, if not set explicitly |
| if (!(flags & FLAGS_PRECISION)) { |
| prec = PICO_PRINTF_DEFAULT_FLOAT_PRECISION; |
| } |
| // limit precision to 9, cause a prec >= 10 can lead to overflow errors |
| while ((len < PICO_PRINTF_FTOA_BUFFER_SIZE) && (prec > 9U)) { |
| buf[len++] = '0'; |
| prec--; |
| } |
| |
| int whole = (int) value; |
| double tmp = (value - whole) * pow10[prec]; |
| unsigned long frac = (unsigned long) tmp; |
| diff = tmp - frac; |
| |
| if (diff > 0.5) { |
| ++frac; |
| // handle rollover, e.g. case 0.99 with prec 1 is 1.0 |
| if (frac >= pow10[prec]) { |
| frac = 0; |
| ++whole; |
| } |
| } else if (diff < 0.5) { |
| } else if ((frac == 0U) || (frac & 1U)) { |
| // if halfway, round up if odd OR if last digit is 0 |
| ++frac; |
| } |
| |
| if (prec == 0U) { |
| diff = value - (double) whole; |
| if (!((diff < 0.5) || (diff > 0.5)) && (whole & 1)) { |
| // exactly 0.5 and ODD, then round up |
| // 1.5 -> 2, but 2.5 -> 2 |
| ++whole; |
| } |
| } else { |
| unsigned int count = prec; |
| // now do fractional part, as an unsigned number |
| while (len < PICO_PRINTF_FTOA_BUFFER_SIZE) { |
| --count; |
| buf[len++] = (char) (48U + (frac % 10U)); |
| if (!(frac /= 10U)) { |
| break; |
| } |
| } |
| // add extra 0s |
| while ((len < PICO_PRINTF_FTOA_BUFFER_SIZE) && (count-- > 0U)) { |
| buf[len++] = '0'; |
| } |
| if (len < PICO_PRINTF_FTOA_BUFFER_SIZE) { |
| // add decimal |
| buf[len++] = '.'; |
| } |
| } |
| |
| // do whole part, number is reversed |
| while (len < PICO_PRINTF_FTOA_BUFFER_SIZE) { |
| buf[len++] = (char) (48 + (whole % 10)); |
| if (!(whole /= 10)) { |
| break; |
| } |
| } |
| |
| // pad leading zeros |
| if (!(flags & FLAGS_LEFT) && (flags & FLAGS_ZEROPAD)) { |
| if (width && (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) { |
| width--; |
| } |
| while ((len < width) && (len < PICO_PRINTF_FTOA_BUFFER_SIZE)) { |
| buf[len++] = '0'; |
| } |
| } |
| |
| if (len < PICO_PRINTF_FTOA_BUFFER_SIZE) { |
| if (negative) { |
| buf[len++] = '-'; |
| } else if (flags & FLAGS_PLUS) { |
| buf[len++] = '+'; // ignore the space if the '+' exists |
| } else if (flags & FLAGS_SPACE) { |
| buf[len++] = ' '; |
| } |
| } |
| |
| return _out_rev(out, buffer, idx, maxlen, buf, len, width, flags); |
| } |
| |
| |
| #if PICO_PRINTF_SUPPORT_EXPONENTIAL |
| |
| // internal ftoa variant for exponential floating-point type, contributed by Martijn Jasperse <m.jasperse@gmail.com> |
| static size_t _etoa(out_fct_type out, char *buffer, size_t idx, size_t maxlen, double value, unsigned int prec, |
| unsigned int width, unsigned int flags) { |
| // check for NaN and special values |
| if (is_nan(value) || (value > DBL_MAX) || (value < -DBL_MAX)) { |
| return _ftoa(out, buffer, idx, maxlen, value, prec, width, flags); |
| } |
| |
| // determine the sign |
| const bool negative = value < 0; |
| if (negative) { |
| value = -value; |
| } |
| |
| // default precision |
| if (!(flags & FLAGS_PRECISION)) { |
| prec = PICO_PRINTF_DEFAULT_FLOAT_PRECISION; |
| } |
| |
| // determine the decimal exponent |
| // based on the algorithm by David Gay (https://www.ampl.com/netlib/fp/dtoa.c) |
| union { |
| uint64_t U; |
| double F; |
| } conv; |
| |
| conv.F = value; |
| int expval; |
| if (conv.U) { |
| int exp2 = (int) ((conv.U >> 52U) & 0x07FFU) - 1023; // effectively log2 |
| conv.U = (conv.U & ((1ULL << 52U) - 1U)) | (1023ULL << 52U); // drop the exponent so conv.F is now in [1,2) |
| // now approximate log10 from the log2 integer part and an expansion of ln around 1.5 |
| expval = (int) (0.1760912590558 + exp2 * 0.301029995663981 + (conv.F - 1.5) * 0.289529654602168); |
| // now we want to compute 10^expval but we want to be sure it won't overflow |
| exp2 = (int) (expval * 3.321928094887362 + 0.5); |
| const double z = expval * 2.302585092994046 - exp2 * 0.6931471805599453; |
| const double z2 = z * z; |
| conv.U = (uint64_t) (exp2 + 1023) << 52U; |
| // compute exp(z) using continued fractions, see https://en.wikipedia.org/wiki/Exponential_function#Continued_fractions_for_ex |
| conv.F *= 1 + 2 * z / (2 - z + (z2 / (6 + (z2 / (10 + z2 / 14))))); |
| // correct for rounding errors |
| if (value < conv.F) { |
| expval--; |
| conv.F /= 10; |
| } |
| } else { |
| expval = 0; |
| } |
| |
| // the exponent format is "%+03d" and largest value is "307", so set aside 4-5 characters |
| unsigned int minwidth = ((expval < 100) && (expval > -100)) ? 4U : 5U; |
| |
| // in "%g" mode, "prec" is the number of *significant figures* not decimals |
| if (flags & FLAGS_ADAPT_EXP) { |
| // do we want to fall-back to "%f" mode? |
| if ((conv.U == 0) || ((value >= 1e-4) && (value < 1e6))) { |
| if ((int) prec > expval) { |
| prec = (unsigned) ((int) prec - expval - 1); |
| } else { |
| prec = 0; |
| } |
| flags |= FLAGS_PRECISION; // make sure _ftoa respects precision |
| // no characters in exponent |
| minwidth = 0U; |
| expval = 0; |
| } else { |
| // we use one sigfig for the whole part |
| if ((prec > 0) && (flags & FLAGS_PRECISION)) { |
| --prec; |
| } |
| } |
| } |
| |
| // will everything fit? |
| unsigned int fwidth = width; |
| if (width > minwidth) { |
| // we didn't fall-back so subtract the characters required for the exponent |
| fwidth -= minwidth; |
| } else { |
| // not enough characters, so go back to default sizing |
| fwidth = 0U; |
| } |
| if ((flags & FLAGS_LEFT) && minwidth) { |
| // if we're padding on the right, DON'T pad the floating part |
| fwidth = 0U; |
| } |
| |
| // rescale the float value |
| if (expval) { |
| value /= conv.F; |
| } |
| |
| // output the floating part |
| const size_t start_idx = idx; |
| idx = _ftoa(out, buffer, idx, maxlen, negative ? -value : value, prec, fwidth, flags & ~FLAGS_ADAPT_EXP); |
| |
| // output the exponent part |
| if (minwidth) { |
| // output the exponential symbol |
| out((flags & FLAGS_UPPERCASE) ? 'E' : 'e', buffer, idx++, maxlen); |
| // output the exponent value |
| idx = _ntoa_long(out, buffer, idx, maxlen, (uint)((expval < 0) ? -expval : expval), expval < 0, 10, 0, minwidth - 1, |
| FLAGS_ZEROPAD | FLAGS_PLUS); |
| // might need to right-pad spaces |
| if (flags & FLAGS_LEFT) { |
| while (idx - start_idx < width) out(' ', buffer, idx++, maxlen); |
| } |
| } |
| return idx; |
| } |
| |
| #endif // PICO_PRINTF_SUPPORT_EXPONENTIAL |
| #endif // PICO_PRINTF_SUPPORT_FLOAT |
| |
| // internal vsnprintf |
| static int _vsnprintf(out_fct_type out, char *buffer, const size_t maxlen, const char *format, va_list va) { |
| #if !PICO_PRINTF_ALWAYS_INCLUDED |
| lazy_vsnprintf = _vsnprintf; |
| #endif |
| unsigned int flags, width, precision, n; |
| size_t idx = 0U; |
| |
| if (!buffer) { |
| // use null output function |
| out = _out_null; |
| } |
| |
| while (*format) { |
| // format specifier? %[flags][width][.precision][length] |
| if (*format != '%') { |
| // no |
| out(*format, buffer, idx++, maxlen); |
| format++; |
| continue; |
| } else { |
| // yes, evaluate it |
| format++; |
| } |
| |
| // evaluate flags |
| flags = 0U; |
| do { |
| switch (*format) { |
| case '0': |
| flags |= FLAGS_ZEROPAD; |
| format++; |
| n = 1U; |
| break; |
| case '-': |
| flags |= FLAGS_LEFT; |
| format++; |
| n = 1U; |
| break; |
| case '+': |
| flags |= FLAGS_PLUS; |
| format++; |
| n = 1U; |
| break; |
| case ' ': |
| flags |= FLAGS_SPACE; |
| format++; |
| n = 1U; |
| break; |
| case '#': |
| flags |= FLAGS_HASH; |
| format++; |
| n = 1U; |
| break; |
| default : |
| n = 0U; |
| break; |
| } |
| } while (n); |
| |
| // evaluate width field |
| width = 0U; |
| if (_is_digit(*format)) { |
| width = _atoi(&format); |
| } else if (*format == '*') { |
| const int w = va_arg(va, int); |
| if (w < 0) { |
| flags |= FLAGS_LEFT; // reverse padding |
| width = (unsigned int) -w; |
| } else { |
| width = (unsigned int) w; |
| } |
| format++; |
| } |
| |
| // evaluate precision field |
| precision = 0U; |
| if (*format == '.') { |
| flags |= FLAGS_PRECISION; |
| format++; |
| if (_is_digit(*format)) { |
| precision = _atoi(&format); |
| } else if (*format == '*') { |
| const int prec = (int) va_arg(va, int); |
| precision = prec > 0 ? (unsigned int) prec : 0U; |
| format++; |
| } |
| } |
| |
| // evaluate length field |
| switch (*format) { |
| case 'l' : |
| flags |= FLAGS_LONG; |
| format++; |
| if (*format == 'l') { |
| flags |= FLAGS_LONG_LONG; |
| format++; |
| } |
| break; |
| case 'h' : |
| flags |= FLAGS_SHORT; |
| format++; |
| if (*format == 'h') { |
| flags |= FLAGS_CHAR; |
| format++; |
| } |
| break; |
| #if PICO_PRINTF_SUPPORT_PTRDIFF_T |
| case 't' : |
| flags |= (sizeof(ptrdiff_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG); |
| format++; |
| break; |
| #endif |
| case 'j' : |
| flags |= (sizeof(intmax_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG); |
| format++; |
| break; |
| case 'z' : |
| flags |= (sizeof(size_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG); |
| format++; |
| break; |
| default : |
| break; |
| } |
| |
| // evaluate specifier |
| switch (*format) { |
| case 'd' : |
| case 'i' : |
| case 'u' : |
| case 'x' : |
| case 'X' : |
| case 'o' : |
| case 'b' : { |
| // set the base |
| unsigned int base; |
| if (*format == 'x' || *format == 'X') { |
| base = 16U; |
| } else if (*format == 'o') { |
| base = 8U; |
| } else if (*format == 'b') { |
| base = 2U; |
| } else { |
| base = 10U; |
| flags &= ~FLAGS_HASH; // no hash for dec format |
| } |
| // uppercase |
| if (*format == 'X') { |
| flags |= FLAGS_UPPERCASE; |
| } |
| |
| // no plus or space flag for u, x, X, o, b |
| if ((*format != 'i') && (*format != 'd')) { |
| flags &= ~(FLAGS_PLUS | FLAGS_SPACE); |
| } |
| |
| // ignore '0' flag when precision is given |
| if (flags & FLAGS_PRECISION) { |
| flags &= ~FLAGS_ZEROPAD; |
| } |
| |
| // convert the integer |
| if ((*format == 'i') || (*format == 'd')) { |
| // signed |
| if (flags & FLAGS_LONG_LONG) { |
| #if PICO_PRINTF_SUPPORT_LONG_LONG |
| const long long value = va_arg(va, long long); |
| idx = _ntoa_long_long(out, buffer, idx, maxlen, |
| (unsigned long long) (value > 0 ? value : 0 - value), value < 0, base, |
| precision, width, flags); |
| #endif |
| } else if (flags & FLAGS_LONG) { |
| const long value = va_arg(va, long); |
| idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned long) (value > 0 ? value : 0 - value), |
| value < 0, base, precision, width, flags); |
| } else { |
| const int value = (flags & FLAGS_CHAR) ? (char) va_arg(va, int) : (flags & FLAGS_SHORT) |
| ? (short int) va_arg(va, int) |
| : va_arg(va, int); |
| idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned int) (value > 0 ? value : 0 - value), |
| value < 0, base, precision, width, flags); |
| } |
| } else { |
| // unsigned |
| if (flags & FLAGS_LONG_LONG) { |
| #if PICO_PRINTF_SUPPORT_LONG_LONG |
| idx = _ntoa_long_long(out, buffer, idx, maxlen, va_arg(va, unsigned long long), false, base, |
| precision, width, flags); |
| #endif |
| } else if (flags & FLAGS_LONG) { |
| idx = _ntoa_long(out, buffer, idx, maxlen, va_arg(va, unsigned long), false, base, precision, |
| width, flags); |
| } else { |
| const unsigned int value = (flags & FLAGS_CHAR) ? (unsigned char) va_arg(va, unsigned int) |
| : (flags & FLAGS_SHORT) |
| ? (unsigned short int) va_arg(va, |
| unsigned int) |
| : va_arg(va, unsigned int); |
| idx = _ntoa_long(out, buffer, idx, maxlen, value, false, base, precision, width, flags); |
| } |
| } |
| format++; |
| break; |
| } |
| case 'f' : |
| case 'F' : |
| #if PICO_PRINTF_SUPPORT_FLOAT |
| if (*format == 'F') flags |= FLAGS_UPPERCASE; |
| idx = _ftoa(out, buffer, idx, maxlen, va_arg(va, double), precision, width, flags); |
| #else |
| for(int i=0;i<2;i++) out('?', buffer, idx++, maxlen); |
| va_arg(va, double); |
| #endif |
| format++; |
| break; |
| case 'e': |
| case 'E': |
| case 'g': |
| case 'G': |
| #if PICO_PRINTF_SUPPORT_FLOAT && PICO_PRINTF_SUPPORT_EXPONENTIAL |
| if ((*format == 'g') || (*format == 'G')) flags |= FLAGS_ADAPT_EXP; |
| if ((*format == 'E') || (*format == 'G')) flags |= FLAGS_UPPERCASE; |
| idx = _etoa(out, buffer, idx, maxlen, va_arg(va, double), precision, width, flags); |
| #else |
| for(int i=0;i<2;i++) out('?', buffer, idx++, maxlen); |
| va_arg(va, double); |
| #endif |
| format++; |
| break; |
| case 'c' : { |
| unsigned int l = 1U; |
| // pre padding |
| if (!(flags & FLAGS_LEFT)) { |
| while (l++ < width) { |
| out(' ', buffer, idx++, maxlen); |
| } |
| } |
| // char output |
| out((char) va_arg(va, int), buffer, idx++, maxlen); |
| // post padding |
| if (flags & FLAGS_LEFT) { |
| while (l++ < width) { |
| out(' ', buffer, idx++, maxlen); |
| } |
| } |
| format++; |
| break; |
| } |
| |
| case 's' : { |
| const char *p = va_arg(va, char*); |
| unsigned int l = _strnlen_s(p, precision ? precision : (size_t) -1); |
| // pre padding |
| if (flags & FLAGS_PRECISION) { |
| l = (l < precision ? l : precision); |
| } |
| if (!(flags & FLAGS_LEFT)) { |
| while (l++ < width) { |
| out(' ', buffer, idx++, maxlen); |
| } |
| } |
| // string output |
| while ((*p != 0) && (!(flags & FLAGS_PRECISION) || precision--)) { |
| out(*(p++), buffer, idx++, maxlen); |
| } |
| // post padding |
| if (flags & FLAGS_LEFT) { |
| while (l++ < width) { |
| out(' ', buffer, idx++, maxlen); |
| } |
| } |
| format++; |
| break; |
| } |
| |
| case 'p' : { |
| width = sizeof(void *) * 2U; |
| flags |= FLAGS_ZEROPAD | FLAGS_UPPERCASE; |
| #if PICO_PRINTF_SUPPORT_LONG_LONG |
| const bool is_ll = sizeof(uintptr_t) == sizeof(long long); |
| if (is_ll) { |
| idx = _ntoa_long_long(out, buffer, idx, maxlen, (uintptr_t) va_arg(va, void*), false, 16U, |
| precision, width, flags); |
| } else { |
| #endif |
| idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned long) ((uintptr_t) va_arg(va, void*)), false, |
| 16U, precision, width, flags); |
| #if PICO_PRINTF_SUPPORT_LONG_LONG |
| } |
| #endif |
| format++; |
| break; |
| } |
| |
| case '%' : |
| out('%', buffer, idx++, maxlen); |
| format++; |
| break; |
| |
| default : |
| out(*format, buffer, idx++, maxlen); |
| format++; |
| break; |
| } |
| } |
| |
| // termination |
| out((char) 0, buffer, idx < maxlen ? idx : maxlen - 1U, maxlen); |
| |
| // return written chars without terminating \0 |
| return (int) idx; |
| } |
| |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| int WRAPPER_FUNC(sprintf)(char *buffer, const char *format, ...) { |
| va_list va; |
| va_start(va, format); |
| const int ret = _vsnprintf(_out_buffer, buffer, (size_t) -1, format, va); |
| va_end(va); |
| return ret; |
| } |
| |
| int WRAPPER_FUNC(snprintf)(char *buffer, size_t count, const char *format, ...) { |
| va_list va; |
| va_start(va, format); |
| const int ret = _vsnprintf(_out_buffer, buffer, count, format, va); |
| va_end(va); |
| return ret; |
| } |
| |
| int WRAPPER_FUNC(vsnprintf)(char *buffer, size_t count, const char *format, va_list va) { |
| return _vsnprintf(_out_buffer, buffer, count, format, va); |
| } |
| |
| int vfctprintf(void (*out)(char character, void *arg), void *arg, const char *format, va_list va) { |
| const out_fct_wrap_type out_fct_wrap = {out, arg}; |
| return _vsnprintf(_out_fct, (char *) (uintptr_t) &out_fct_wrap, (size_t) -1, format, va); |
| } |
| |
| #if LIB_PICO_PRINTF_PICO |
| #if !PICO_PRINTF_ALWAYS_INCLUDED |
| /** |
| * Output a character to a custom device like UART, used by the printf() function |
| * This function is declared here only. You have to write your custom implementation somewhere |
| * \param character Character to output |
| */ |
| static void _putchar(char character) { |
| putchar(character); |
| } |
| |
| // internal _putchar wrapper |
| static inline void _out_char(char character, void *buffer, size_t idx, size_t maxlen) { |
| (void) buffer; |
| (void) idx; |
| (void) maxlen; |
| if (character) { |
| _putchar(character); |
| } |
| } |
| |
| bool weak_raw_printf(const char *fmt, ...) { |
| va_list va; |
| va_start(va, fmt); |
| bool rc = weak_raw_vprintf(fmt, va); |
| va_end(va); |
| return rc; |
| } |
| |
| bool weak_raw_vprintf(const char *fmt, va_list args) { |
| if (lazy_vsnprintf) { |
| char buffer[1]; |
| lazy_vsnprintf(_out_char, buffer, (size_t) -1, fmt, args); |
| return true; |
| } else { |
| puts(fmt); |
| return false; |
| } |
| } |
| #endif |
| #endif |
