/* * SPDX-License-Identifier: MIT * SPDX-FileCopyrightText: Copyright Marco Paland (info@paland.com), PALANDesign Hannover, Germany * SPDX-FileCopyrightText: Copyright TF-RMM Contributors. * * 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). */ /* * fine this globally (e.g. gcc -DPRINTF_INCLUDE_CONFIG_H ...) to include the * printf_config.h header file * default: undefined */ /* * support for the floating point type (%f) * default: activated */ #ifndef PRINTF_DISABLE_SUPPORT_FLOAT #define PRINTF_SUPPORT_FLOAT #endif /* import float.h for DBL_MAX */ #if defined(PRINTF_SUPPORT_FLOAT) #include #endif #ifdef PRINTF_INCLUDE_CONFIG_H #include "printf_config.h" #endif #include #include #include /* * 'ntoa' conversion buffer size, this must be big enough to hold one converted * numeric number including padded zeros (dynamically created on stack) * default: 32 byte */ #ifndef PRINTF_NTOA_BUFFER_SIZE #define PRINTF_NTOA_BUFFER_SIZE 32U #endif /* *'ftoa' conversion buffer size, this must be big enough to hold one converted * float number including padded zeros (dynamically created on stack) * default: 32 byte */ #ifndef PRINTF_FTOA_BUFFER_SIZE #define PRINTF_FTOA_BUFFER_SIZE 32U #endif /* * support for exponential floating point notation (%e/%g) * default: activated */ #ifndef PRINTF_DISABLE_SUPPORT_EXPONENTIAL #define PRINTF_SUPPORT_EXPONENTIAL #endif /* * define the default floating point precision * default: 6 digits */ #ifndef PRINTF_DEFAULT_FLOAT_PRECISION #define PRINTF_DEFAULT_FLOAT_PRECISION 6U #endif /* * define the largest float suitable to print with %f * default: 1e9 */ #ifndef PRINTF_MAX_FLOAT #define PRINTF_MAX_FLOAT 1e9 #endif /* * support for the long long types (%llu or %p) * default: activated */ #ifndef PRINTF_DISABLE_SUPPORT_LONG_LONG #define PRINTF_SUPPORT_LONG_LONG #endif /* * support for the ptrdiff_t type (%t) * ptrdiff_t is normally defined in as long or long long type * default: activated */ #ifndef PRINTF_DISABLE_SUPPORT_PTRDIFF_T #define PRINTF_SUPPORT_PTRDIFF_T #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) /* output function type */ typedef void (*out_fct_type)(char character, void *buffer, size_t idx, size_t maxlen); /* 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 _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); } } /* 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 < PRINTF_NTOA_BUFFER_SIZE)) { buf[len++] = '0'; } while ((flags & FLAGS_ZEROPAD) && (len < width) && (len < 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 < PRINTF_NTOA_BUFFER_SIZE)) { buf[len++] = 'x'; } else if ((base == 16U) && (flags & FLAGS_UPPERCASE) && (len < PRINTF_NTOA_BUFFER_SIZE)) { buf[len++] = 'X'; } else if ((base == 2U) && (len < PRINTF_NTOA_BUFFER_SIZE)) { buf[len++] = 'b'; } if (len < PRINTF_NTOA_BUFFER_SIZE) { buf[len++] = '0'; } } if (len < PRINTF_NTOA_BUFFER_SIZE) { if (negative) { buf[len++] = '-'; } else if (flags & FLAGS_PLUS) { /* ignore the space if the '+' exists */ buf[len++] = '+'; } 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[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++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10; value /= base; } while (value && (len < 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 defined(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[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++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10; value /= base; } while (value && (len < PRINTF_NTOA_BUFFER_SIZE)); } return _ntoa_format(out, buffer, idx, maxlen, buf, len, negative, (unsigned int)base, prec, width, flags); } #endif /* PRINTF_SUPPORT_LONG_LONG */ #if defined(PRINTF_SUPPORT_FLOAT) #if defined(PRINTF_SUPPORT_EXPONENTIAL) /* * forward declaration so that _ftoa can switch to exp notation for * values > 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 /* 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[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 (value != 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 > PRINTF_MAX_FLOAT) || (value < -PRINTF_MAX_FLOAT)) { #if defined(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 = PRINTF_DEFAULT_FLOAT_PRECISION; } /* * limit precision to 9, cause a prec >= 10 can lead to overflow * errors */ while ((len < 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) { /* skip */ } 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 < PRINTF_FTOA_BUFFER_SIZE) { --count; buf[len++] = (char)(48U + (frac % 10U)); frac /= 10U; if (!frac) { break; } } /* add extra 0s */ while ((len < PRINTF_FTOA_BUFFER_SIZE) && (count-- > 0U)) { buf[len++] = '0'; } if (len < PRINTF_FTOA_BUFFER_SIZE) { /* add decimal */ buf[len++] = '.'; } } /* do whole part, number is reversed */ while (len < PRINTF_FTOA_BUFFER_SIZE) { buf[len++] = (char)(48 + (whole % 10)); whole /= 10; if (!whole) { break; } } /* pad leading zeros */ if (!(flags & FLAGS_LEFT) && (flags & FLAGS_ZEROPAD)) { if (width && (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) { width--; } while ((len < width) && (len < PRINTF_FTOA_BUFFER_SIZE)) { buf[len++] = '0'; } } if (len < PRINTF_FTOA_BUFFER_SIZE) { if (negative) { buf[len++] = '-'; } else if (flags & FLAGS_PLUS) { /* ignore the space if the '+' exists */ buf[len++] = '+'; } else if (flags & FLAGS_SPACE) { buf[len++] = ' '; } } return _out_rev(out, buffer, idx, maxlen, buf, len, width, flags); } #if defined(PRINTF_SUPPORT_EXPONENTIAL) /* * internal ftoa variant for exponential floating-point type, contributed by * Martijn Jasperse */ 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 ((value != 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 = 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; /* effectively log2 */ int exp2 = (int)((conv.U >> 52U) & 0x07FFU) - 1023; /* drop the exponent so conv.F is now in [1,2) */ conv.U = (conv.U & ((1ULL << 52U) - 1U)) | (1023ULL << 52U); /* * now approximate log10 from the log2 integer part and an expansion * of ln around 1.5 */ int 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; } /* * 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 ((value >= 1e-4) && (value < 1e6)) { if ((int)prec > expval) { prec = (unsigned int)((int)prec - expval - 1); } else { prec = 0; } /* make sure _ftoa respects precision */ flags |= FLAGS_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, (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 /* PRINTF_SUPPORT_EXPONENTIAL */ #endif /* PRINTF_SUPPORT_FLOAT */ /* internal vsnprintf */ static int _vsnprintf(out_fct_type out, char *buffer, const size_t maxlen, const char *format, va_list va) { 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 defined(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; /* no hash for dec format */ flags &= ~FLAGS_HASH; } /* 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 defined(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 defined(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; } #if defined(PRINTF_SUPPORT_FLOAT) case 'f': case 'F': if (*format == 'F') { flags |= FLAGS_UPPERCASE; } idx = _ftoa(out, buffer, idx, maxlen, va_arg(va, double), precision, width, flags); format++; break; #if defined(PRINTF_SUPPORT_EXPONENTIAL) case 'e': case 'E': case 'g': case 'G': 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); format++; break; #endif /* PRINTF_SUPPORT_EXPONENTIAL */ #endif /* PRINTF_SUPPORT_FLOAT */ 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 defined(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 defined(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 printf_(const char *format, ...) { va_list va; va_start(va, format); char buffer[1]; const int ret = _vsnprintf(_out_char, buffer, (size_t)-1, format, va); va_end(va); return ret; } int 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 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 vprintf_(const char *format, va_list va) { char buffer[1]; return _vsnprintf(_out_char, buffer, (size_t)-1, format, va); } int vsnprintf_(char *buffer, size_t count, const char *format, va_list va) { return _vsnprintf(_out_buffer, buffer, count, format, va); } int fctprintf(void (*out)(char character, void *arg), void *arg, const char *format, ...) { va_list va; va_start(va, format); const out_fct_wrap_type out_fct_wrap = { out, arg }; const int ret = _vsnprintf(_out_fct, (char *)(uintptr_t)&out_fct_wrap, (size_t)-1, format, va); va_end(va); return ret; }