1 ///////////////////////////////////////////////////////////////////////////////
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2 // \author (c) Marco Paland (info@paland.com)
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3 // 2014-2019, PALANDesign Hannover, Germany
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5 // \license The MIT License (MIT)
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7 // Permission is hereby granted, free of charge, to any person obtaining a copy
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8 // of this software and associated documentation files (the "Software"), to deal
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9 // in the Software without restriction, including without limitation the rights
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10 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 // copies of the Software, and to permit persons to whom the Software is
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12 // furnished to do so, subject to the following conditions:
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14 // The above copyright notice and this permission notice shall be included in
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15 // all copies or substantial portions of the Software.
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17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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25 // \brief Tiny printf, sprintf and (v)snprintf implementation, optimized for speed on
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26 // embedded systems with a very limited resources. These routines are thread
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27 // safe and reentrant!
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28 // Use this instead of the bloated standard/newlib printf cause these use
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29 // malloc for printf (and may not be thread safe).
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31 ///////////////////////////////////////////////////////////////////////////////
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33 #include <stdbool.h>
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39 // define this globally (e.g. gcc -DPRINTF_INCLUDE_CONFIG_H ...) to include the
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40 // printf_config.h header file
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41 // default: undefined
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42 #ifdef PRINTF_INCLUDE_CONFIG_H
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43 #include "printf_config.h"
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47 // 'ntoa' conversion buffer size, this must be big enough to hold one converted
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48 // numeric number including padded zeros (dynamically created on stack)
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50 #ifndef PRINTF_NTOA_BUFFER_SIZE
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51 #define PRINTF_NTOA_BUFFER_SIZE 32U
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54 // 'ftoa' conversion buffer size, this must be big enough to hold one converted
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55 // float number including padded zeros (dynamically created on stack)
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57 #ifndef PRINTF_FTOA_BUFFER_SIZE
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58 #define PRINTF_FTOA_BUFFER_SIZE 32U
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61 // support for the floating point type (%f)
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62 // default: activated
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63 #ifndef PRINTF_DISABLE_SUPPORT_FLOAT
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64 #define PRINTF_SUPPORT_FLOAT
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67 // support for exponential floating point notation (%e/%g)
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68 // default: activated
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69 #ifndef PRINTF_DISABLE_SUPPORT_EXPONENTIAL
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70 #define PRINTF_SUPPORT_EXPONENTIAL
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73 // define the default floating point precision
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74 // default: 6 digits
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75 #ifndef PRINTF_DEFAULT_FLOAT_PRECISION
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76 #define PRINTF_DEFAULT_FLOAT_PRECISION 6U
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79 // define the largest float suitable to print with %f
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81 #ifndef PRINTF_MAX_FLOAT
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82 #define PRINTF_MAX_FLOAT 1e9
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85 // support for the long long types (%llu or %p)
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86 // default: activated
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87 #ifndef PRINTF_DISABLE_SUPPORT_LONG_LONG
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88 #define PRINTF_SUPPORT_LONG_LONG
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91 // support for the ptrdiff_t type (%t)
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92 // ptrdiff_t is normally defined in <stddef.h> as long or long long type
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93 // default: activated
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94 #ifndef PRINTF_DISABLE_SUPPORT_PTRDIFF_T
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95 #define PRINTF_SUPPORT_PTRDIFF_T
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98 ///////////////////////////////////////////////////////////////////////////////
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100 // internal flag definitions
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101 #define FLAGS_ZEROPAD (1U << 0U)
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102 #define FLAGS_LEFT (1U << 1U)
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103 #define FLAGS_PLUS (1U << 2U)
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104 #define FLAGS_SPACE (1U << 3U)
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105 #define FLAGS_HASH (1U << 4U)
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106 #define FLAGS_UPPERCASE (1U << 5U)
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107 #define FLAGS_CHAR (1U << 6U)
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108 #define FLAGS_SHORT (1U << 7U)
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109 #define FLAGS_LONG (1U << 8U)
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110 #define FLAGS_LONG_LONG (1U << 9U)
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111 #define FLAGS_PRECISION (1U << 10U)
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112 #define FLAGS_ADAPT_EXP (1U << 11U)
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115 // import float.h for DBL_MAX
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116 #if defined(PRINTF_SUPPORT_FLOAT)
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121 // output function type
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122 typedef void (*out_fct_type)(char character, void* buffer, size_t idx, size_t maxlen);
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125 // wrapper (used as buffer) for output function type
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127 void (*fct)(char character, void* arg);
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129 } out_fct_wrap_type;
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132 // internal buffer output
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133 static inline void _out_buffer(char character, void* buffer, size_t idx, size_t maxlen)
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135 if (idx < maxlen) {
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136 ((char*)buffer)[idx] = character;
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141 // internal null output
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142 static inline void _out_null(char character, void* buffer, size_t idx, size_t maxlen)
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144 (void)character; (void)buffer; (void)idx; (void)maxlen;
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148 // internal _putchar wrapper
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149 static inline void _out_char(char character, void* buffer, size_t idx, size_t maxlen)
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151 (void)buffer; (void)idx; (void)maxlen;
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153 _putchar(character);
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158 // internal output function wrapper
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159 static inline void _out_fct(char character, void* buffer, size_t idx, size_t maxlen)
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161 (void)idx; (void)maxlen;
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163 // buffer is the output fct pointer
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164 ((out_fct_wrap_type*)buffer)->fct(character, ((out_fct_wrap_type*)buffer)->arg);
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169 // internal secure strlen
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170 // \return The length of the string (excluding the terminating 0) limited by 'maxsize'
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171 static inline unsigned int _strnlen_s(const char* str, size_t maxsize)
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174 for (s = str; *s && maxsize--; ++s);
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175 return (unsigned int)(s - str);
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179 // internal test if char is a digit (0-9)
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180 // \return true if char is a digit
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181 static inline bool _is_digit(char ch)
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183 return (ch >= '0') && (ch <= '9');
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187 // internal ASCII string to unsigned int conversion
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188 static unsigned int _atoi(const char** str)
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190 unsigned int i = 0U;
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191 while (_is_digit(**str)) {
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192 i = i * 10U + (unsigned int)(*((*str)++) - '0');
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198 // output the specified string in reverse, taking care of any zero-padding
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199 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)
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201 const size_t start_idx = idx;
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203 // pad spaces up to given width
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204 if (!(flags & FLAGS_LEFT) && !(flags & FLAGS_ZEROPAD)) {
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205 for (size_t i = len; i < width; i++) {
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206 out(' ', buffer, idx++, maxlen);
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212 out(buf[--len], buffer, idx++, maxlen);
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215 // append pad spaces up to given width
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216 if (flags & FLAGS_LEFT) {
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217 while (idx - start_idx < width) {
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218 out(' ', buffer, idx++, maxlen);
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226 // internal itoa format
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227 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)
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229 // pad leading zeros
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230 if (!(flags & FLAGS_LEFT)) {
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231 if (width && (flags & FLAGS_ZEROPAD) && (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) {
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234 while ((len < prec) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
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237 while ((flags & FLAGS_ZEROPAD) && (len < width) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
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243 if (flags & FLAGS_HASH) {
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244 if (!(flags & FLAGS_PRECISION) && len && ((len == prec) || (len == width))) {
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246 if (len && (base == 16U)) {
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250 if ((base == 16U) && !(flags & FLAGS_UPPERCASE) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
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253 else if ((base == 16U) && (flags & FLAGS_UPPERCASE) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
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256 else if ((base == 2U) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
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259 if (len < PRINTF_NTOA_BUFFER_SIZE) {
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264 if (len < PRINTF_NTOA_BUFFER_SIZE) {
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268 else if (flags & FLAGS_PLUS) {
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269 buf[len++] = '+'; // ignore the space if the '+' exists
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271 else if (flags & FLAGS_SPACE) {
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276 return _out_rev(out, buffer, idx, maxlen, buf, len, width, flags);
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280 // internal itoa for 'long' type
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281 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)
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283 char buf[PRINTF_NTOA_BUFFER_SIZE];
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286 // no hash for 0 values
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288 flags &= ~FLAGS_HASH;
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291 // write if precision != 0 and value is != 0
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292 if (!(flags & FLAGS_PRECISION) || value) {
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294 const char digit = (char)(value % base);
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295 buf[len++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10;
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297 } while (value && (len < PRINTF_NTOA_BUFFER_SIZE));
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300 return _ntoa_format(out, buffer, idx, maxlen, buf, len, negative, (unsigned int)base, prec, width, flags);
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304 // internal itoa for 'long long' type
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305 #if defined(PRINTF_SUPPORT_LONG_LONG)
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306 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)
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308 char buf[PRINTF_NTOA_BUFFER_SIZE];
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311 // no hash for 0 values
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313 flags &= ~FLAGS_HASH;
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316 // write if precision != 0 and value is != 0
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317 if (!(flags & FLAGS_PRECISION) || value) {
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319 const char digit = (char)(value % base);
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320 buf[len++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10;
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322 } while (value && (len < PRINTF_NTOA_BUFFER_SIZE));
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325 return _ntoa_format(out, buffer, idx, maxlen, buf, len, negative, (unsigned int)base, prec, width, flags);
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327 #endif // PRINTF_SUPPORT_LONG_LONG
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330 #if defined(PRINTF_SUPPORT_FLOAT)
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332 #if defined(PRINTF_SUPPORT_EXPONENTIAL)
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333 // forward declaration so that _ftoa can switch to exp notation for values > PRINTF_MAX_FLOAT
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334 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);
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338 // internal ftoa for fixed decimal floating point
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339 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)
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341 char buf[PRINTF_FTOA_BUFFER_SIZE];
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346 static const double pow10[] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000 };
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348 // test for special values
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349 if (value != value)
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350 return _out_rev(out, buffer, idx, maxlen, "nan", 3, width, flags);
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351 if (value < -DBL_MAX)
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352 return _out_rev(out, buffer, idx, maxlen, "fni-", 4, width, flags);
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353 if (value > DBL_MAX)
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354 return _out_rev(out, buffer, idx, maxlen, (flags & FLAGS_PLUS) ? "fni+" : "fni", (flags & FLAGS_PLUS) ? 4U : 3U, width, flags);
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356 // test for very large values
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357 // standard printf behavior is to print EVERY whole number digit -- which could be 100s of characters overflowing your buffers == bad
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358 if ((value > PRINTF_MAX_FLOAT) || (value < -PRINTF_MAX_FLOAT)) {
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359 #if defined(PRINTF_SUPPORT_EXPONENTIAL)
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360 return _etoa(out, buffer, idx, maxlen, value, prec, width, flags);
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366 // test for negative
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367 bool negative = false;
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373 // set default precision, if not set explicitly
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374 if (!(flags & FLAGS_PRECISION)) {
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375 prec = PRINTF_DEFAULT_FLOAT_PRECISION;
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377 // limit precision to 9, cause a prec >= 10 can lead to overflow errors
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378 while ((len < PRINTF_FTOA_BUFFER_SIZE) && (prec > 9U)) {
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383 int whole = (int)value;
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384 double tmp = (value - whole) * pow10[prec];
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385 unsigned long frac = (unsigned long)tmp;
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390 // handle rollover, e.g. case 0.99 with prec 1 is 1.0
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391 if (frac >= pow10[prec]) {
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396 else if (diff < 0.5) {
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398 else if ((frac == 0U) || (frac & 1U)) {
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399 // if halfway, round up if odd OR if last digit is 0
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404 diff = value - (double)whole;
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405 if ((!(diff < 0.5) || (diff > 0.5)) && (whole & 1)) {
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406 // exactly 0.5 and ODD, then round up
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407 // 1.5 -> 2, but 2.5 -> 2
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412 unsigned int count = prec;
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413 // now do fractional part, as an unsigned number
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414 while (len < PRINTF_FTOA_BUFFER_SIZE) {
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416 buf[len++] = (char)(48U + (frac % 10U));
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417 if (!(frac /= 10U)) {
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422 while ((len < PRINTF_FTOA_BUFFER_SIZE) && (count-- > 0U)) {
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425 if (len < PRINTF_FTOA_BUFFER_SIZE) {
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431 // do whole part, number is reversed
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432 while (len < PRINTF_FTOA_BUFFER_SIZE) {
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433 buf[len++] = (char)(48 + (whole % 10));
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434 if (!(whole /= 10)) {
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439 // pad leading zeros
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440 if (!(flags & FLAGS_LEFT) && (flags & FLAGS_ZEROPAD)) {
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441 if (width && (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) {
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444 while ((len < width) && (len < PRINTF_FTOA_BUFFER_SIZE)) {
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449 if (len < PRINTF_FTOA_BUFFER_SIZE) {
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453 else if (flags & FLAGS_PLUS) {
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454 buf[len++] = '+'; // ignore the space if the '+' exists
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456 else if (flags & FLAGS_SPACE) {
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461 return _out_rev(out, buffer, idx, maxlen, buf, len, width, flags);
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465 #if defined(PRINTF_SUPPORT_EXPONENTIAL)
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466 // internal ftoa variant for exponential floating-point type, contributed by Martijn Jasperse <m.jasperse@gmail.com>
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467 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)
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469 // check for NaN and special values
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470 if ((value != value) || (value > DBL_MAX) || (value < -DBL_MAX)) {
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471 return _ftoa(out, buffer, idx, maxlen, value, prec, width, flags);
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474 // determine the sign
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475 const bool negative = value < 0;
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480 // default precision
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481 if (!(flags & FLAGS_PRECISION)) {
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482 prec = PRINTF_DEFAULT_FLOAT_PRECISION;
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485 // determine the decimal exponent
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486 // based on the algorithm by David Gay (https://www.ampl.com/netlib/fp/dtoa.c)
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493 int exp2 = (int)((conv.U >> 52U) & 0x07FFU) - 1023; // effectively log2
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494 conv.U = (conv.U & ((1ULL << 52U) - 1U)) | (1023ULL << 52U); // drop the exponent so conv.F is now in [1,2)
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495 // now approximate log10 from the log2 integer part and an expansion of ln around 1.5
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496 int expval = (int)(0.1760912590558 + exp2 * 0.301029995663981 + (conv.F - 1.5) * 0.289529654602168);
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497 // now we want to compute 10^expval but we want to be sure it won't overflow
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498 exp2 = (int)(expval * 3.321928094887362 + 0.5);
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499 const double z = expval * 2.302585092994046 - exp2 * 0.6931471805599453;
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500 const double z2 = z * z;
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501 conv.U = (uint64_t)(exp2 + 1023) << 52U;
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502 // compute exp(z) using continued fractions, see https://en.wikipedia.org/wiki/Exponential_function#Continued_fractions_for_ex
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503 conv.F *= 1 + 2 * z / (2 - z + (z2 / (6 + (z2 / (10 + z2 / 14)))));
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504 // correct for rounding errors
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505 if (value < conv.F) {
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510 // the exponent format is "%+03d" and largest value is "307", so set aside 4-5 characters
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511 unsigned int minwidth = ((expval < 100) && (expval > -100)) ? 4U : 5U;
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513 // in "%g" mode, "prec" is the number of *significant figures* not decimals
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514 if (flags & FLAGS_ADAPT_EXP) {
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515 // do we want to fall-back to "%f" mode?
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516 if ((value >= 1e-4) && (value < 1e6)) {
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517 if ((int)prec > expval) {
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518 prec = (unsigned)((int)prec - expval - 1);
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523 flags |= FLAGS_PRECISION; // make sure _ftoa respects precision
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524 // no characters in exponent
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529 // we use one sigfig for the whole part
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530 if ((prec > 0) && (flags & FLAGS_PRECISION)) {
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536 // will everything fit?
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537 unsigned int fwidth = width;
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538 if (width > minwidth) {
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539 // we didn't fall-back so subtract the characters required for the exponent
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540 fwidth -= minwidth;
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542 // not enough characters, so go back to default sizing
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545 if ((flags & FLAGS_LEFT) && minwidth) {
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546 // if we're padding on the right, DON'T pad the floating part
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550 // rescale the float value
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555 // output the floating part
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556 const size_t start_idx = idx;
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557 idx = _ftoa(out, buffer, idx, maxlen, negative ? -value : value, prec, fwidth, flags & ~FLAGS_ADAPT_EXP);
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559 // output the exponent part
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561 // output the exponential symbol
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562 out((flags & FLAGS_UPPERCASE) ? 'E' : 'e', buffer, idx++, maxlen);
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563 // output the exponent value
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564 idx = _ntoa_long(out, buffer, idx, maxlen, (expval < 0) ? -expval : expval, expval < 0, 10, 0, minwidth-1, FLAGS_ZEROPAD | FLAGS_PLUS);
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565 // might need to right-pad spaces
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566 if (flags & FLAGS_LEFT) {
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567 while (idx - start_idx < width) out(' ', buffer, idx++, maxlen);
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572 #endif // PRINTF_SUPPORT_EXPONENTIAL
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573 #endif // PRINTF_SUPPORT_FLOAT
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576 // internal vsnprintf
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577 static int _vsnprintf(out_fct_type out, char* buffer, const size_t maxlen, const char* format, va_list va)
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579 unsigned int flags, width, precision, n;
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583 // use null output function
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589 // format specifier? %[flags][width][.precision][length]
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590 if (*format != '%') {
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592 out(*format, buffer, idx++, maxlen);
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597 // yes, evaluate it
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605 case '0': flags |= FLAGS_ZEROPAD; format++; n = 1U; break;
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606 case '-': flags |= FLAGS_LEFT; format++; n = 1U; break;
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607 case '+': flags |= FLAGS_PLUS; format++; n = 1U; break;
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608 case ' ': flags |= FLAGS_SPACE; format++; n = 1U; break;
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609 case '#': flags |= FLAGS_HASH; format++; n = 1U; break;
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610 default : n = 0U; break;
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614 // evaluate width field
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616 if (_is_digit(*format)) {
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617 width = _atoi(&format);
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619 else if (*format == '*') {
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620 const int w = va_arg(va, int);
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622 flags |= FLAGS_LEFT; // reverse padding
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623 width = (unsigned int)-w;
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626 width = (unsigned int)w;
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631 // evaluate precision field
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633 if (*format == '.') {
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634 flags |= FLAGS_PRECISION;
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636 if (_is_digit(*format)) {
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637 precision = _atoi(&format);
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639 else if (*format == '*') {
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640 const int prec = (int)va_arg(va, int);
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641 precision = prec > 0 ? (unsigned int)prec : 0U;
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646 // evaluate length field
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649 flags |= FLAGS_LONG;
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651 if (*format == 'l') {
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652 flags |= FLAGS_LONG_LONG;
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657 flags |= FLAGS_SHORT;
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659 if (*format == 'h') {
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660 flags |= FLAGS_CHAR;
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664 #if defined(PRINTF_SUPPORT_PTRDIFF_T)
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666 flags |= (sizeof(ptrdiff_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
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671 flags |= (sizeof(intmax_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
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675 flags |= (sizeof(size_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
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682 // evaluate specifier
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693 if (*format == 'x' || *format == 'X') {
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696 else if (*format == 'o') {
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699 else if (*format == 'b') {
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704 flags &= ~FLAGS_HASH; // no hash for dec format
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707 if (*format == 'X') {
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708 flags |= FLAGS_UPPERCASE;
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711 // no plus or space flag for u, x, X, o, b
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712 if ((*format != 'i') && (*format != 'd')) {
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713 flags &= ~(FLAGS_PLUS | FLAGS_SPACE);
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716 // ignore '0' flag when precision is given
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717 if (flags & FLAGS_PRECISION) {
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718 flags &= ~FLAGS_ZEROPAD;
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721 // convert the integer
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722 if ((*format == 'i') || (*format == 'd')) {
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724 if (flags & FLAGS_LONG_LONG) {
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725 #if defined(PRINTF_SUPPORT_LONG_LONG)
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726 const long long value = va_arg(va, long long);
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727 idx = _ntoa_long_long(out, buffer, idx, maxlen, (unsigned long long)(value > 0 ? value : 0 - value), value < 0, base, precision, width, flags);
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730 else if (flags & FLAGS_LONG) {
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731 const long value = va_arg(va, long);
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732 idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned long)(value > 0 ? value : 0 - value), value < 0, base, precision, width, flags);
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735 const int value = (flags & FLAGS_CHAR) ? (char)va_arg(va, int) : (flags & FLAGS_SHORT) ? (short int)va_arg(va, int) : va_arg(va, int);
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736 idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned int)(value > 0 ? value : 0 - value), value < 0, base, precision, width, flags);
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741 if (flags & FLAGS_LONG_LONG) {
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742 #if defined(PRINTF_SUPPORT_LONG_LONG)
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743 idx = _ntoa_long_long(out, buffer, idx, maxlen, va_arg(va, unsigned long long), false, base, precision, width, flags);
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746 else if (flags & FLAGS_LONG) {
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747 idx = _ntoa_long(out, buffer, idx, maxlen, va_arg(va, unsigned long), false, base, precision, width, flags);
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750 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);
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751 idx = _ntoa_long(out, buffer, idx, maxlen, value, false, base, precision, width, flags);
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757 #if defined(PRINTF_SUPPORT_FLOAT)
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760 if (*format == 'F') flags |= FLAGS_UPPERCASE;
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761 idx = _ftoa(out, buffer, idx, maxlen, va_arg(va, double), precision, width, flags);
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764 #if defined(PRINTF_SUPPORT_EXPONENTIAL)
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769 if ((*format == 'g')||(*format == 'G')) flags |= FLAGS_ADAPT_EXP;
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770 if ((*format == 'E')||(*format == 'G')) flags |= FLAGS_UPPERCASE;
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771 idx = _etoa(out, buffer, idx, maxlen, va_arg(va, double), precision, width, flags);
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774 #endif // PRINTF_SUPPORT_EXPONENTIAL
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775 #endif // PRINTF_SUPPORT_FLOAT
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777 unsigned int l = 1U;
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779 if (!(flags & FLAGS_LEFT)) {
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780 while (l++ < width) {
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781 out(' ', buffer, idx++, maxlen);
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785 out((char)va_arg(va, int), buffer, idx++, maxlen);
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787 if (flags & FLAGS_LEFT) {
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788 while (l++ < width) {
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789 out(' ', buffer, idx++, maxlen);
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797 const char* p = va_arg(va, char*);
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798 unsigned int l = _strnlen_s(p, precision ? precision : (size_t)-1);
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800 if (flags & FLAGS_PRECISION) {
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801 l = (l < precision ? l : precision);
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803 if (!(flags & FLAGS_LEFT)) {
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804 while (l++ < width) {
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805 out(' ', buffer, idx++, maxlen);
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809 while ((*p != 0) && (!(flags & FLAGS_PRECISION) || precision--)) {
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810 out(*(p++), buffer, idx++, maxlen);
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813 if (flags & FLAGS_LEFT) {
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814 while (l++ < width) {
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815 out(' ', buffer, idx++, maxlen);
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823 width = sizeof(void*) * 2U;
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824 flags |= FLAGS_ZEROPAD | FLAGS_UPPERCASE;
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825 #if defined(PRINTF_SUPPORT_LONG_LONG)
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826 const bool is_ll = sizeof(uintptr_t) == sizeof(long long);
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828 idx = _ntoa_long_long(out, buffer, idx, maxlen, (uintptr_t)va_arg(va, void*), false, 16U, precision, width, flags);
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832 idx = _ntoa_long(out, buffer, idx, maxlen, (unsigned long)((uintptr_t)va_arg(va, void*)), false, 16U, precision, width, flags);
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833 #if defined(PRINTF_SUPPORT_LONG_LONG)
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841 out('%', buffer, idx++, maxlen);
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846 out(*format, buffer, idx++, maxlen);
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853 out((char)0, buffer, idx < maxlen ? idx : maxlen - 1U, maxlen);
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855 // return written chars without terminating \0
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860 ///////////////////////////////////////////////////////////////////////////////
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862 int printf_(const char* format, ...)
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865 va_start(va, format);
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867 const int ret = _vsnprintf(_out_char, buffer, (size_t)-1, format, va);
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873 int sprintf_(char* buffer, const char* format, ...)
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876 va_start(va, format);
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877 const int ret = _vsnprintf(_out_buffer, buffer, (size_t)-1, format, va);
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883 int snprintf_(char* buffer, size_t count, const char* format, ...)
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886 va_start(va, format);
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887 const int ret = _vsnprintf(_out_buffer, buffer, count, format, va);
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893 int vprintf_(const char* format, va_list va)
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896 return _vsnprintf(_out_char, buffer, (size_t)-1, format, va);
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900 int vsnprintf_(char* buffer, size_t count, const char* format, va_list va)
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902 return _vsnprintf(_out_buffer, buffer, count, format, va);
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906 int fctprintf(void (*out)(char character, void* arg), void* arg, const char* format, ...)
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909 va_start(va, format);
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910 const out_fct_wrap_type out_fct_wrap = { out, arg };
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911 const int ret = _vsnprintf(_out_fct, (char*)(uintptr_t)&out_fct_wrap, (size_t)-1, format, va);
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