From 896376f4a8eb1e1bf6aeefb33a7fc00b8b5f2a4b Mon Sep 17 00:00:00 2001 From: Marco Paland Date: Fri, 13 Oct 2017 13:01:38 +0200 Subject: Several bug fixes --- printf.cpp | 1077 ++++++++++++++++++++++++++++++++---------------------------- 1 file changed, 580 insertions(+), 497 deletions(-) (limited to 'printf.cpp') diff --git a/printf.cpp b/printf.cpp index ca1faf3..22831d0 100644 --- a/printf.cpp +++ b/printf.cpp @@ -1,497 +1,580 @@ -/////////////////////////////////////////////////////////////////////////////// -// \author (c) Marco Paland (info@paland.com) -// 2014-2015, 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 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 -#include "printf.h" - - -// buffer size used for printf -#define PRINTF_BUFFER_SIZE 128U - -// ntoa conversion buffer size, this must be big enough to hold one converted numeric number -#define NTOA_BUFFER_SIZE 32U - -// ftoa conversion buffer size, this must be big enough to hold one converted float number -#define FTOA_BUFFER_SIZE 32U - -// define this to support floating point (%f) -#define PRINTF_FLOAT_SUPPORT - - -/////////////////////////////////////////////////////////////////////////////// - -// 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_LONG (1U << 6U) -#define FLAGS_LONG_LONG (1U << 7U) - - -// returns 1 if char is a digit, 0 if not -static inline unsigned int _is_digit(char ch) -{ - return (ch >= '0' && ch <= '9') ? 1U : 0U; -} - - -// internal ASCII to unsigned int conversion -static inline unsigned int _atoi(const char** str) -{ - unsigned int i = 0U; - while (_is_digit(**str)) { - i = i * 10U + *((*str)++) - '0'; - } - return i; -} - - -// internal itoa -template -static size_t _ntoa(T value, char* buffer, unsigned int base, size_t maxlen, unsigned int prec, unsigned int width, unsigned int flags) -{ - char buf[NTOA_BUFFER_SIZE]; - size_t len = 0U; - unsigned int negative = 0U; - - if (maxlen == 0U) { - return 0U; - } - if (base > 16U) { - return 0U; - } - if (value < 0) { - negative = 1U; - value = 0 - value; - } - - do { - char digit = (char)((unsigned)value % base); - buf[len++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10; - value /= (T)base; - } while ((len < maxlen) && (value > 0)); - - // pad zeros - while ((flags & FLAGS_ZEROPAD) && !(flags & FLAGS_LEFT) && (len < prec) && (len < width) && (len < maxlen)) { - buf[len++] = '0'; - } - - // handle sign - if ((len == width) && (negative || (flags & FLAGS_PLUS) || (flags & FLAGS_SPACE))) { - len = width - 1U; - } - if (negative) { - buf[len++] = '-'; - } - else if (flags & FLAGS_PLUS) { - buf[len++] = '+'; // ignore the space if the '+' exists - } - else if (flags & FLAGS_SPACE) { - buf[len++] = ' '; - } - - // pad spaces up to given width - if (!(flags & FLAGS_LEFT)) { - while ((len < width) && (len < maxlen)) { - buf[len++] = ' '; - } - } - - // reverse string - for (size_t i = 0U; (i < len) && (i < maxlen); ++i) { - buffer[i] = buf[len - i - 1]; - } - - // append pad spaces up to given width - if (flags & FLAGS_LEFT) { - while ((len < width) && (len < maxlen)) { - buffer[len++] = ' '; - } - } - - return len; -} - - -#if defined(PRINTF_FLOAT_SUPPORT) -static size_t _ftoa(double value, char* buffer, size_t maxlen, unsigned int prec, unsigned int width, unsigned int flags) -{ - // test for NaN - if (!(value == value) && (maxlen > 2U)) { - buffer[0] = 'n'; buffer[1] = 'a'; buffer[2] = 'n'; - return (size_t)3U; - } - // if input is larger than thres_max, revert to exponential - const double thres_max = (double)0x7FFFFFFF; - - char buf[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}; - - // limit precision - if (prec == (unsigned int)-1) { - prec = 6U; // by default, precesion is 6 - } - if (prec > 9U) { - // precision of >= 10 can lead to overflow errors - prec = 9U; - } - - unsigned int negative = 0U; - if (value < 0) { - negative = 1U; - value = value * -1; - } - - 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) && ((frac == 0) || (frac & 1))) { - // if halfway, round up if odd, OR if last digit is 0 - ++frac; - } - - // for very large numbers switch back to native sprintf for exponentials. anyone want to write code to replace this? - // normal printf behavior is to print EVERY whole number digit which can be 100s of characters overflowing your buffers == bad - if (value > thres_max) { - return 0; - } - - if (prec == 0) { - diff = value - whole; - if (diff > 0.5) { - // greater than 0.5, round up, e.g. 1.6 -> 2 - ++whole; - } - else if (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 - do { - --count; - buf[len++] = (char)(48U + (frac % 10U)); - } while ((len < FTOA_BUFFER_SIZE) && (frac /= 10U)); - // add extra 0s - while ((len < FTOA_BUFFER_SIZE) && (count-- > 0U)) { - buf[len++] = '0'; - } - if (len < FTOA_BUFFER_SIZE) { - // add decimal - buf[len++] = '.'; - } - } - - // do whole part - // Take care of sign conversion. Number is reversed - size_t wlen = 0U; - do { - buf[len++] = (char)(48 + (whole % 10)); - wlen++; - } while ((len < FTOA_BUFFER_SIZE) && (whole /= 10)); - // pad zeros - while ((flags & FLAGS_ZEROPAD) && (wlen < width) && (len < FTOA_BUFFER_SIZE)) { - buf[len++] = '0'; - wlen++; - } - // handle sign - if (len < 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++] = ' '; - } - } - // pad spaces up to given width - while ((wlen < width) && (len < FTOA_BUFFER_SIZE)) { - buf[len++] = ' '; - wlen++; - } - - // reverse it - for (size_t i = 0U; (i < len) && (i < maxlen); ++i) { - buffer[i] = buf[len - i - 1]; - } - - return len; -} -#endif - - -// internal vsnprintf -static size_t vsnprintf(char* buffer, size_t buffer_len, const char* format, va_list va) -{ - unsigned int flags, width, precision, n; - size_t idx = 0U; - - while (idx < buffer_len) { - // end reached? - if (*format == '\0') { - buffer[idx] = '\0'; - break; - } - - // format specifier? %[flags][width][.precision][length] - if (*format != '%') { - // no - buffer[idx++] = *format; - 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 = 1U; - if (_is_digit(*format)) { - width = _atoi(&format); - } - else if (*format == '*') { - width = (unsigned int)va_arg(va, int); - format++; - } - - // evaluate precision field - precision = (unsigned int)-1; - if (*format == '.') { - format++; - if (_is_digit(*format)) { - precision = _atoi(&format); - } - else if (*format == '*') { - precision = (unsigned int)va_arg(va, int); - format++; - } - flags |= FLAGS_ZEROPAD; - } - - // evaluate length field - if (*format == 'l' || *format == 'L') { - flags |= FLAGS_LONG; - format++; - } - if ((*format == 'l') && (flags & FLAGS_LONG)) { - flags |= FLAGS_LONG_LONG; - format++; - } - - // evaluate specifier - switch (*format) { - case 'u' : - case 'x' : - case 'X' : - case 'o' : - case 'b' : - flags = flags & ~(FLAGS_PLUS | FLAGS_SPACE); - case 'd' : - case 'i' : { - // 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; - } - // uppercase - if (*format == 'X') { - flags |= FLAGS_UPPERCASE; - } - - if (flags & FLAGS_HASH) { - if (buffer_len - idx > 0U) { - buffer[idx++] = '0'; - } - if ((*format == 'x') && (buffer_len - idx > 0U)) { - buffer[idx++] = 'x'; - } - if ((*format == 'X') && (buffer_len - idx > 0U)) { - buffer[idx++] = 'X'; - } - } - - // convert the integer - if (*format == 'i' || *format == 'd') { - // signed - if (flags & FLAGS_LONG_LONG) { - idx += _ntoa(va_arg(va, long long), &buffer[idx], base, buffer_len - idx, precision, width, flags); - } - else if (flags & FLAGS_LONG) { - idx += _ntoa(va_arg(va, long), &buffer[idx], base, buffer_len - idx, precision, width, flags); - } - else { - idx += _ntoa(va_arg(va, int), &buffer[idx], base, buffer_len - idx, precision, width, flags); - } - } - else { - // unsigned - if (flags & FLAGS_LONG_LONG) { - idx += _ntoa(va_arg(va, unsigned long long), &buffer[idx], base, buffer_len - idx, precision, width, flags); - } - else if (flags & FLAGS_LONG) { - idx += _ntoa(va_arg(va, unsigned long), &buffer[idx], base, buffer_len - idx, precision, width, flags); - } - else { - idx += _ntoa(va_arg(va, unsigned int), &buffer[idx], base, buffer_len - idx, precision, width, flags); - } - } - format++; - break; - } -#if defined(PRINTF_FLOAT_SUPPORT) - case 'f' : - case 'F' : - idx += _ftoa(va_arg(va, double), &buffer[idx], buffer_len - idx, precision, width, flags); - format++; - break; -#endif - case 'c' : - buffer[idx++] = (char)va_arg(va, char); - format++; - break; - - case 's' : { - char* p = va_arg(va, char*); - while ((idx < buffer_len) && (*p != 0) && precision--) { - buffer[idx++] = *(p++); - } - format++; - break; - } - - case 'p' : { - width = sizeof(void*) * 2U; - flags |= FLAGS_ZEROPAD; - size_t size_void = sizeof(void*); - if (size_void > sizeof(long)) { - idx +=_ntoa(reinterpret_cast(va_arg(va, void*)), &buffer[idx], 16U, buffer_len - idx, precision, width, flags); - } - else { - idx += _ntoa(reinterpret_cast(va_arg(va, void*)), &buffer[idx], 16U, buffer_len - idx, precision, width, flags); - } - format++; - break; - } - - case '%' : - buffer[idx++] = '%'; - format++; - break; - - default : - buffer[idx++] = *format; - break; - } - } - - return idx; -} - -/////////////////////////////////////////////////////////////////////////////// - -int printf(const char* format, ...) -{ - va_list va; - va_start(va, format); - char buffer[PRINTF_BUFFER_SIZE]; - size_t ret = vsnprintf(buffer, PRINTF_BUFFER_SIZE, format, va); - va_end(va); - for (size_t i = 0U; i < ret; ++i) { - _putchar(buffer[i]); - } - return (int)ret; -} - - -int sprintf(char* buffer, const char* format, ...) -{ - va_list va; - va_start(va, format); - size_t ret = vsnprintf(buffer, (size_t)-1, format, va); - va_end(va); - return (int)ret; -} - - -int snprintf(char* buffer, size_t count, const char* format, ...) -{ - va_list va; - va_start(va, format); - size_t ret = vsnprintf(buffer, count, format, va); - va_end(va); - return (int)ret; -} +/////////////////////////////////////////////////////////////////////////////// +// \author (c) Marco Paland (info@paland.com) +// 2014-2017, 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 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 +#include "printf.h" + + +// buffer size used for printf +#define PRINTF_BUFFER_SIZE 128U + +// ntoa conversion buffer size, this must be big enough to hold one converted numeric number +#define NTOA_BUFFER_SIZE 32U + +// ftoa conversion buffer size, this must be big enough to hold one converted float number +#define FTOA_BUFFER_SIZE 32U + +// define this to support floating point (%f) +#define PRINTF_FLOAT_SUPPORT + + +/////////////////////////////////////////////////////////////////////////////// + +// 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_LONG (1U << 6U) +#define FLAGS_LONG_LONG (1U << 7U) +#define FLAGS_PRECISION (1U << 8U) +#define FLAGS_WIDTH (1U << 9U) + + +// internal strlen, returns the length of the string +static inline size_t _strlen(const char* str) +{ + size_t len = 0U; + while (str[len] != '\0') { + len++; + } + return len; +} + + +// returns 1 if char is a digit, 0 if not +static inline unsigned int _is_digit(char ch) +{ + return (ch >= '0' && ch <= '9') ? 1U : 0U; +} + + +// internal ASCII to unsigned int conversion +static inline unsigned int _atoi(const char** str) +{ + unsigned int i = 0U; + while (_is_digit(**str)) { + i = i * 10U + *((*str)++) - '0'; + } + return i; +} + + +// internal itoa +template +static size_t _ntoa(T value, char* buffer, unsigned int base, size_t maxlen, unsigned int prec, unsigned int width, unsigned int flags) +{ + char buf[NTOA_BUFFER_SIZE]; + size_t len = 0U; + unsigned int negative = 0U; + + if (maxlen == 0U) { + return 0U; + } + if (base > 16U) { + return 0U; + } + if (value < 0) { + negative = 1U; + value = 0 - value; + } + + // write if precision != 0 and value is != 0 + if (!(flags & FLAGS_PRECISION) || (value != 0)) { + do { + char digit = (char)((unsigned)value % base); + buf[len++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10; + value /= (T)base; + } while ((len < NTOA_BUFFER_SIZE) && (value > 0)); + } + + // pad leading zeros + while (!(flags & FLAGS_LEFT) && (len < prec) && (len < NTOA_BUFFER_SIZE)) { + buf[len++] = '0'; + } + while (!(flags & FLAGS_LEFT) && (flags & FLAGS_ZEROPAD) && (len < width) && (len < NTOA_BUFFER_SIZE)) { + buf[len++] = '0'; + } + + // handle hash + if (flags & FLAGS_HASH) { + if (((len == prec) || (len == width)) && (len > 0U)) { + len--; + if ((base == 16U) && (len > 0U)) { + len--; + } + } + if ((base == 16U) && !(flags & FLAGS_UPPERCASE) && (len < NTOA_BUFFER_SIZE)) { + buf[len++] = 'x'; + } + if ((base == 16U) && (flags & FLAGS_UPPERCASE) && (len < NTOA_BUFFER_SIZE)) { + buf[len++] = 'X'; + } + if (len < NTOA_BUFFER_SIZE) { + buf[len++] = '0'; + } + } + + // handle sign + if ((len == width) && (negative || (flags & FLAGS_PLUS) || (flags & FLAGS_SPACE))) { + len--; + } + if (len < 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++] = ' '; + } + } + + // pad spaces up to given width + if (!(flags & FLAGS_LEFT) && !(flags & FLAGS_ZEROPAD)) { + while ((len < width) && (len < NTOA_BUFFER_SIZE)) { + buf[len++] = ' '; + } + } + + // reverse string + for (size_t i = 0U; (i < len) && (i < maxlen); ++i) { + buffer[i] = buf[len - i - 1]; + } + + // append pad spaces up to given width + if (flags & FLAGS_LEFT) { + while ((len < width) && (len < maxlen)) { + buffer[len++] = ' '; + } + } + + return len; +} + + +#if defined(PRINTF_FLOAT_SUPPORT) +static size_t _ftoa(double value, char* buffer, size_t maxlen, unsigned int prec, unsigned int width, unsigned int flags) +{ + // test for NaN + if (!(value == value) && (maxlen > 2U)) { + buffer[0] = 'n'; buffer[1] = 'a'; buffer[2] = 'n'; + return (size_t)3U; + } + // if input is larger than thres_max, revert to exponential + const double thres_max = (double)0x7FFFFFFF; + + char buf[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 }; + + // limit precision + if (!(flags & FLAGS_PRECISION)) { + prec = 6U; // by default, precesion is 6 + } + if (prec > 9U) { + // precision of >= 10 can lead to overflow errors + prec = 9U; + } + + unsigned int negative = 0U; + if (value < 0) { + negative = 1U; + value = 0 - value; + } + + 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) && ((frac == 0) || (frac & 1))) { + // if halfway, round up if odd, OR if last digit is 0 + ++frac; + } + + // for very large numbers switch back to native sprintf for exponentials. anyone want to write code to replace this? + // normal printf behavior is to print EVERY whole number digit which can be 100s of characters overflowing your buffers == bad + if (value > thres_max) { + return 0; + } + + if (prec == 0) { + diff = value - whole; + if (diff > 0.5) { + // greater than 0.5, round up, e.g. 1.6 -> 2 + ++whole; + } + else if (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 + do { + --count; + buf[len++] = (char)(48U + (frac % 10U)); + } while ((len < FTOA_BUFFER_SIZE) && (frac /= 10U)); + // add extra 0s + while ((len < FTOA_BUFFER_SIZE) && (count-- > 0U)) { + buf[len++] = '0'; + } + if (len < FTOA_BUFFER_SIZE) { + // add decimal + buf[len++] = '.'; + } + } + + // do whole part + // Take care of sign conversion. Number is reversed + size_t wlen = 0U; + do { + buf[len++] = (char)(48 + (whole % 10)); + wlen++; + } while ((len < FTOA_BUFFER_SIZE) && (whole /= 10)); + + // pad leading zeros + while (!(flags & FLAGS_LEFT) && (len < prec) && (len < FTOA_BUFFER_SIZE)) { + buf[len++] = '0'; + } + while (!(flags & FLAGS_LEFT) && (flags & FLAGS_ZEROPAD) && (len < width) && (len < FTOA_BUFFER_SIZE)) { + buf[len++] = '0'; + } + + // handle sign + if (len < 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++] = ' '; + } + } + + // pad spaces up to given width + if (!(flags & FLAGS_LEFT) && !(flags & FLAGS_ZEROPAD)) { + while ((len < width) && (len < FTOA_BUFFER_SIZE)) { + buf[len++] = ' '; + } + } + + // reverse string + for (size_t i = 0U; (i < len) && (i < maxlen); ++i) { + buffer[i] = buf[len - i - 1]; + } + + // append pad spaces up to given width + if (flags & FLAGS_LEFT) { + while ((len < width) && (len < maxlen)) { + buffer[len++] = ' '; + } + } + + return len; +} +#endif // PRINTF_FLOAT_SUPPORT + + +// internal vsnprintf +static size_t vsnprintf(char* buffer, size_t buffer_len, const char* format, va_list va) +{ + unsigned int flags, width, precision, n; + size_t idx = 0U; + + while (idx < buffer_len) { + // end reached? + if (*format == '\0') { + buffer[idx] = '\0'; + break; + } + + // format specifier? %[flags][width][.precision][length] + if (*format != '%') { + // no + buffer[idx++] = *format; + 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 = (unsigned int)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 == '*') { + precision = (unsigned int)va_arg(va, int); + format++; + } + } + + // evaluate length field + if (*format == 'l' || *format == 'L') { + flags |= FLAGS_LONG; + format++; + } + if ((*format == 'l') && (flags & FLAGS_LONG)) { + flags |= FLAGS_LONG_LONG; + format++; + } + + // evaluate specifier + switch (*format) { + case 'u' : + case 'x' : + case 'X' : + case 'o' : + case 'b' : + // no plus or space flag for the types above + flags &= ~(FLAGS_PLUS | FLAGS_SPACE); + case 'd' : + case 'i' : { + // 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; + flags &= ~FLAGS_HASH; // no hash for bin format + } + else { + base = 10U; + flags &= ~FLAGS_HASH; // no hash for dec format + } + // uppercase + if (*format == 'X') { + flags |= FLAGS_UPPERCASE; + } + + // convert the integer + if (*format == 'i' || *format == 'd') { + // signed + if (flags & FLAGS_LONG_LONG) { + idx += _ntoa(va_arg(va, long long), &buffer[idx], base, buffer_len - idx, precision, width, flags); + } + else if (flags & FLAGS_LONG) { + idx += _ntoa(va_arg(va, long), &buffer[idx], base, buffer_len - idx, precision, width, flags); + } + else { + idx += _ntoa(va_arg(va, int), &buffer[idx], base, buffer_len - idx, precision, width, flags); + } + } + else { + // unsigned + if (flags & FLAGS_LONG_LONG) { + idx += _ntoa(va_arg(va, unsigned long long), &buffer[idx], base, buffer_len - idx, precision, width, flags); + } + else if (flags & FLAGS_LONG) { + idx += _ntoa(va_arg(va, unsigned long), &buffer[idx], base, buffer_len - idx, precision, width, flags); + } + else { + idx += _ntoa(va_arg(va, unsigned int), &buffer[idx], base, buffer_len - idx, precision, width, flags); + } + } + format++; + break; + } +#if defined(PRINTF_FLOAT_SUPPORT) + case 'f' : + case 'F' : + idx += _ftoa(va_arg(va, double), &buffer[idx], buffer_len - idx, precision, width, flags); + format++; + break; +#endif // PRINTF_FLOAT_SUPPORT + case 'c' : { + size_t l = 1U; + // pre padding + if (!(flags & FLAGS_LEFT)) { + while ((idx < buffer_len) && (l++ < width)) { + buffer[idx++] = ' '; + } + } + // char output + buffer[idx++] = va_arg(va, char); + // post padding + if (flags & FLAGS_LEFT) { + while ((idx < buffer_len) && (l++ < width)) { + buffer[idx++] = ' '; + } + } + format++; + break; + } + + case 's' : { + char* p = va_arg(va, char*); + size_t l = _strlen(p); + // pre padding + if (flags & FLAGS_PRECISION) { + l = (l < precision ? l : precision); + } + if (!(flags & FLAGS_LEFT)) { + while ((idx < buffer_len) && (l++ < width)) { + buffer[idx++] = ' '; + } + } + // string output + while ((idx < buffer_len) && (*p != 0) && (!(flags & FLAGS_PRECISION) || precision--)) { + buffer[idx++] = *(p++); + } + // post padding + if (flags & FLAGS_LEFT) { + while ((idx < buffer_len) && (l++ < width)) { + buffer[idx++] = ' '; + } + } + format++; + break; + } + + case 'p' : { + width = sizeof(void*) * 2U; + flags |= FLAGS_ZEROPAD; + size_t size_void = sizeof(void*); + if (size_void > sizeof(long)) { + idx +=_ntoa(reinterpret_cast(va_arg(va, void*)), &buffer[idx], 16U, buffer_len - idx, precision, width, flags); + } + else { + idx += _ntoa(reinterpret_cast(va_arg(va, void*)), &buffer[idx], 16U, buffer_len - idx, precision, width, flags); + } + format++; + break; + } + + case '%' : + buffer[idx++] = '%'; + format++; + break; + + default : + buffer[idx++] = *format; + break; + } + } + + return idx; +} + +/////////////////////////////////////////////////////////////////////////////// + +int printf(const char* format, ...) +{ + va_list va; + va_start(va, format); + char buffer[PRINTF_BUFFER_SIZE]; + size_t ret = vsnprintf(buffer, PRINTF_BUFFER_SIZE, format, va); + va_end(va); + for (size_t i = 0U; i < ret; ++i) { + _putchar(buffer[i]); + } + return (int)ret; +} + + +int sprintf(char* buffer, const char* format, ...) +{ + va_list va; + va_start(va, format); + size_t ret = vsnprintf(buffer, (size_t)-1, format, va); + va_end(va); + return (int)ret; +} + + +int snprintf(char* buffer, size_t count, const char* format, ...) +{ + va_list va; + va_start(va, format); + size_t ret = vsnprintf(buffer, count, format, va); + va_end(va); + return (int)ret; +} -- cgit v1.2.3