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628 lines
18 KiB
C
628 lines
18 KiB
C
///////////////////////////////////////////////////////////////////////////////
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// \author (c) Marco Paland (info@paland.com)
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// 2014-2017, PALANDesign Hannover, Germany
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//
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// \license The MIT License (MIT)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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// \brief Tiny printf, sprintf and snprintf implementation, optimized for speed on
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// embedded systems with a very limited resources. These routines are thread
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// safe and reentrant!
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// Use this instead of the bloated standard/newlib printf cause these use
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// malloc for printf (and may not be thread safe).
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "printf.h"
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// buffer size used for printf (created on stack)
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#define PRINTF_BUFFER_SIZE 128U
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// ntoa conversion buffer size, this must be big enough to hold one converted numeric number (created on stack)
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#define PRINTF_NTOA_BUFFER_SIZE 32U
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// ftoa conversion buffer size, this must be big enough to hold one converted float number (created on stack)
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#define PRINTF_FTOA_BUFFER_SIZE 32U
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// define this to support floating point (%f)
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#define PRINTF_FLOAT_SUPPORT
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// define this to support long long types (%llu or %p)
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#define PRINTF_LONG_LONG_SUPPORT
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///////////////////////////////////////////////////////////////////////////////
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// internal flag definitions
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#define FLAGS_ZEROPAD (1U << 0U)
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#define FLAGS_LEFT (1U << 1U)
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#define FLAGS_PLUS (1U << 2U)
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#define FLAGS_SPACE (1U << 3U)
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#define FLAGS_HASH (1U << 4U)
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#define FLAGS_UPPERCASE (1U << 5U)
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#define FLAGS_LONG (1U << 6U)
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#define FLAGS_LONG_LONG (1U << 7U)
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#define FLAGS_PRECISION (1U << 8U)
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#define FLAGS_WIDTH (1U << 9U)
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// internal strlen
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// \return The length of the string (excluding the terminating 0)
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static inline size_t _strlen(const char* str)
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{
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const char* s;
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for (s = str; *s; ++s);
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return (size_t)(s - str);
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}
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// internal test if char is a digit (0-9)
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// \return true if char is a digit
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static inline bool _is_digit(char ch)
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{
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return (ch >= '0') && (ch <= '9');
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}
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// internal ASCII string to unsigned int conversion
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static inline unsigned int _atoi(const char** str)
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{
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unsigned int i = 0U;
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while (_is_digit(**str)) {
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i = i * 10U + (unsigned int)(*((*str)++) - '0');
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}
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return i;
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}
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// internal itoa format
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static size_t _ntoa_format(char* buffer, char* buf, size_t len, bool negative, unsigned int base, size_t maxlen, unsigned int prec, unsigned int width, unsigned int flags)
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{
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if (maxlen == 0U) {
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return 0U;
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}
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if (base > 16U) {
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return 0U;
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}
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// pad leading zeros
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while (!(flags & FLAGS_LEFT) && (len < prec) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
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buf[len++] = '0';
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}
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while (!(flags & FLAGS_LEFT) && (flags & FLAGS_ZEROPAD) && (len < width) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
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buf[len++] = '0';
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}
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// handle hash
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if (flags & FLAGS_HASH) {
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if (((len == prec) || (len == width)) && (len > 0U)) {
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len--;
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if ((base == 16U) && (len > 0U)) {
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len--;
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}
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}
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if ((base == 16U) && !(flags & FLAGS_UPPERCASE) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
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buf[len++] = 'x';
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}
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if ((base == 16U) && (flags & FLAGS_UPPERCASE) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
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buf[len++] = 'X';
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}
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if (len < PRINTF_NTOA_BUFFER_SIZE) {
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buf[len++] = '0';
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}
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}
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// handle sign
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if ((len == width) && (negative || (flags & FLAGS_PLUS) || (flags & FLAGS_SPACE))) {
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len--;
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}
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if (len < PRINTF_NTOA_BUFFER_SIZE) {
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if (negative) {
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buf[len++] = '-';
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}
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else if (flags & FLAGS_PLUS) {
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buf[len++] = '+'; // ignore the space if the '+' exists
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}
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else if (flags & FLAGS_SPACE) {
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buf[len++] = ' ';
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}
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}
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// pad spaces up to given width
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size_t idx = 0U;
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if (!(flags & FLAGS_LEFT) && !(flags & FLAGS_ZEROPAD)) {
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for (size_t i = len; (i < width) && (i < maxlen); ++i) {
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buffer[idx++] = ' ';
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}
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}
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// reverse string
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for (size_t i = 0U; (i < len) && (i < maxlen); ++i) {
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buffer[idx++] = buf[len - i - 1U];
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}
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// append pad spaces up to given width
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if (flags & FLAGS_LEFT) {
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while ((idx < width) && (idx < maxlen)) {
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buffer[idx++] = ' ';
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}
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}
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return idx;
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}
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// internal itoa for 'long' type
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static size_t _ntoa_long(char* buffer, unsigned long value, bool negative, unsigned long base, size_t maxlen, unsigned int prec, unsigned int width, unsigned int flags)
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{
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char buf[PRINTF_NTOA_BUFFER_SIZE];
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size_t len = 0U;
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// write if precision != 0 and value is != 0
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if (!(flags & FLAGS_PRECISION) || value) {
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do {
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char digit = (char)(value % base);
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buf[len++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10;
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value /= base;
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} while ((len < PRINTF_NTOA_BUFFER_SIZE) && value);
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}
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return _ntoa_format(buffer, buf, len, negative, (unsigned int)base, maxlen, prec, width, flags);
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}
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// internal itoa for 'long long' type
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#if defined(PRINTF_LONG_LONG_SUPPORT)
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static size_t _ntoa_long_long(char* buffer, unsigned long long value, bool negative, unsigned long long base, size_t maxlen, unsigned int prec, unsigned int width, unsigned int flags)
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{
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char buf[PRINTF_NTOA_BUFFER_SIZE];
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size_t len = 0U;
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// write if precision != 0 and value is != 0
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if (!(flags & FLAGS_PRECISION) || value) {
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do {
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char digit = (char)(value % base);
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buf[len++] = digit < 10 ? '0' + digit : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10;
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value /= base;
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} while ((len < PRINTF_NTOA_BUFFER_SIZE) && value);
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}
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return _ntoa_format(buffer, buf, len, negative, (unsigned int)base, maxlen, prec, width, flags);
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}
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#endif // PRINTF_LONG_LONG_SUPPORT
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#if defined(PRINTF_FLOAT_SUPPORT)
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static size_t _ftoa(double value, char* buffer, size_t maxlen, unsigned int prec, unsigned int width, unsigned int flags)
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{
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char buf[PRINTF_FTOA_BUFFER_SIZE];
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size_t len = 0U;
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double diff = 0.0;
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// if input is larger than thres_max, revert to exponential
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const double thres_max = (double)0x7FFFFFFF;
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// powers of 10
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static const double pow10[] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000 };
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// test for negative
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bool negative = false;
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if (value < 0) {
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negative = true;
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value = 0 - value;
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}
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// limit precision
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if (!(flags & FLAGS_PRECISION)) {
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prec = 6U; // by default, precesion is 6
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}
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if (prec > 9U) {
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// precision of >= 10 can lead to overflow errors
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prec = 9U;
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}
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int whole = (int)value;
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double tmp = (value - whole) * pow10[prec];
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unsigned long frac = (unsigned long)tmp;
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diff = tmp - frac;
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if (diff > 0.5) {
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++frac;
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// handle rollover, e.g. case 0.99 with prec 1 is 1.0
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if (frac >= pow10[prec]) {
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frac = 0;
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++whole;
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}
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}
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else if ((diff == 0.5) && ((frac == 0) || (frac & 1))) {
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// if halfway, round up if odd, OR if last digit is 0
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++frac;
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}
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// for very large numbers switch back to native sprintf for exponentials. anyone want to write code to replace this?
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// normal printf behavior is to print EVERY whole number digit which can be 100s of characters overflowing your buffers == bad
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if (value > thres_max) {
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return 0U;
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}
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if (prec == 0U) {
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diff = value - whole;
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if (diff > 0.5) {
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// greater than 0.5, round up, e.g. 1.6 -> 2
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++whole;
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}
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else if ((diff == 0.5) && (whole & 1)) {
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// exactly 0.5 and ODD, then round up
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// 1.5 -> 2, but 2.5 -> 2
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++whole;
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}
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}
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else {
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unsigned int count = prec;
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// now do fractional part, as an unsigned number
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do {
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--count;
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buf[len++] = (char)(48U + (frac % 10U));
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} while ((len < PRINTF_FTOA_BUFFER_SIZE) && (frac /= 10U));
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// add extra 0s
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while ((len < PRINTF_FTOA_BUFFER_SIZE) && (count-- > 0U)) {
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buf[len++] = '0';
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}
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if (len < PRINTF_FTOA_BUFFER_SIZE) {
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// add decimal
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buf[len++] = '.';
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}
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}
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// do whole part, number is reversed
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while (len < PRINTF_FTOA_BUFFER_SIZE) {
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buf[len++] = (char)(48 + (whole % 10));
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if (!(whole /= 10)) {
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break;
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}
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}
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// pad leading zeros
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while (!(flags & FLAGS_LEFT) && (len < prec) && (len < PRINTF_FTOA_BUFFER_SIZE)) {
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buf[len++] = '0';
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}
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while (!(flags & FLAGS_LEFT) && (flags & FLAGS_ZEROPAD) && (len < width) && (len < PRINTF_FTOA_BUFFER_SIZE)) {
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buf[len++] = '0';
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}
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// handle sign
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if (len < PRINTF_FTOA_BUFFER_SIZE) {
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if (negative) {
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buf[len++] = '-';
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}
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else if (flags & FLAGS_PLUS) {
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buf[len++] = '+'; // ignore the space if the '+' exists
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}
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else if (flags & FLAGS_SPACE) {
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buf[len++] = ' ';
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}
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}
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// pad spaces up to given width
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size_t idx = 0U;
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if (!(flags & FLAGS_LEFT) && !(flags & FLAGS_ZEROPAD)) {
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for (size_t i = len; (i < width) && (i < maxlen); ++i) {
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buffer[idx++] = ' ';
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}
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}
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// reverse string
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for (size_t i = 0U; (i < len) && (i < maxlen); ++i) {
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buffer[idx++] = buf[len - i - 1U];
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}
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// append pad spaces up to given width
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if (flags & FLAGS_LEFT) {
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while ((idx < width) && (idx < maxlen)) {
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buffer[idx++] = ' ';
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}
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}
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return idx;
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}
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#endif // PRINTF_FLOAT_SUPPORT
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// internal vsnprintf
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static size_t _vsnprintf(char* buffer, size_t buffer_len, const char* format, va_list va)
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{
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unsigned int flags, width, precision, n;
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size_t idx = 0U;
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// check if buffer is valid
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if (!buffer) {
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return 0U;
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}
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while ((idx < buffer_len) && *format)
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{
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// format specifier? %[flags][width][.precision][length]
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if (*format != '%') {
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// no
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buffer[idx++] = *format;
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format++;
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continue;
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}
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else {
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// yes, evaluate it
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format++;
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}
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// evaluate flags
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flags = 0U;
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do {
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switch (*format) {
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case '0': flags |= FLAGS_ZEROPAD; format++; n = 1U; break;
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case '-': flags |= FLAGS_LEFT; format++; n = 1U; break;
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case '+': flags |= FLAGS_PLUS; format++; n = 1U; break;
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case ' ': flags |= FLAGS_SPACE; format++; n = 1U; break;
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case '#': flags |= FLAGS_HASH; format++; n = 1U; break;
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default : n = 0U; break;
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}
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} while (n);
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// evaluate width field
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width = 0U;
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if (_is_digit(*format)) {
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width = _atoi(&format);
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}
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else if (*format == '*') {
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const int w = va_arg(va, int);
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if (w < 0) {
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flags |= FLAGS_LEFT; // reverse padding
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width = (unsigned int)-w;
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}
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else {
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width = (unsigned int)w;
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}
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format++;
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}
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// evaluate precision field
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precision = 0U;
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if (*format == '.') {
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flags |= FLAGS_PRECISION;
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format++;
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if (_is_digit(*format)) {
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precision = _atoi(&format);
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}
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else if (*format == '*') {
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precision = (unsigned int)va_arg(va, int);
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format++;
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}
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}
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// evaluate length field
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if (*format == 'l' || *format == 'L') {
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flags |= FLAGS_LONG;
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format++;
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}
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if ((*format == 'l') && (flags & FLAGS_LONG)) {
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flags |= FLAGS_LONG_LONG;
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format++;
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}
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if (*format == 'z') {
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flags |= (sizeof(size_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
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format++;
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}
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// evaluate specifier
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switch (*format) {
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case 'd' :
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case 'i' :
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case 'u' :
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case 'x' :
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case 'X' :
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case 'o' :
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case 'b' : {
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// set the base
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unsigned int base;
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if (*format == 'x' || *format == 'X') {
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base = 16U;
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}
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else if (*format == 'o') {
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base = 8U;
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}
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else if (*format == 'b') {
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base = 2U;
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flags &= ~FLAGS_HASH; // no hash for bin format
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}
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else {
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base = 10U;
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flags &= ~FLAGS_HASH; // no hash for dec format
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}
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// uppercase
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if (*format == 'X') {
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flags |= FLAGS_UPPERCASE;
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}
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// no plus or space flag for u, x, X, o, b
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if ((*format != 'i') && (*format != 'd')) {
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flags &= ~(FLAGS_PLUS | FLAGS_SPACE);
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}
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// convert the integer
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if ((*format == 'i') || (*format == 'd')) {
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// signed
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if (flags & FLAGS_LONG_LONG) {
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#if defined(PRINTF_LONG_LONG_SUPPORT)
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const long long value = va_arg(va, long long);
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idx += _ntoa_long_long(&buffer[idx], (unsigned long long)(value > 0 ? value : 0 - value), value < 0, base, buffer_len - idx, precision, width, flags);
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#endif
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}
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else if (flags & FLAGS_LONG) {
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const long value = va_arg(va, long);
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idx += _ntoa_long(&buffer[idx], (unsigned long)(value > 0 ? value : 0 - value), value < 0, base, buffer_len - idx, precision, width, flags);
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}
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else {
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const int value = va_arg(va, int);
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idx += _ntoa_long(&buffer[idx], (unsigned int)(value > 0 ? value : 0 - value), value < 0, base, buffer_len - idx, precision, width, flags);
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}
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}
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else {
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// unsigned
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if (flags & FLAGS_LONG_LONG) {
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#if defined(PRINTF_LONG_LONG_SUPPORT)
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idx += _ntoa_long_long(&buffer[idx], va_arg(va, unsigned long long), false, base, buffer_len - idx, precision, width, flags);
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#endif
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}
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else if (flags & FLAGS_LONG) {
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idx += _ntoa_long(&buffer[idx], va_arg(va, unsigned long), false, base, buffer_len - idx, precision, width, flags);
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}
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else {
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idx += _ntoa_long(&buffer[idx], va_arg(va, unsigned int), false, base, buffer_len - idx, precision, width, flags);
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}
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}
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format++;
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break;
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}
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#if defined(PRINTF_FLOAT_SUPPORT)
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case 'f' :
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case 'F' :
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idx += _ftoa(va_arg(va, double), &buffer[idx], buffer_len - idx, precision, width, flags);
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format++;
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break;
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#endif // PRINTF_FLOAT_SUPPORT
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case 'c' : {
|
|
size_t l = 1U;
|
|
// pre padding
|
|
if (!(flags & FLAGS_LEFT)) {
|
|
while ((idx < buffer_len) && (l++ < width)) {
|
|
buffer[idx++] = ' ';
|
|
}
|
|
}
|
|
// char output
|
|
buffer[idx++] = (char)va_arg(va, int);
|
|
// 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 | FLAGS_UPPERCASE;
|
|
if (sizeof(uintptr_t) == sizeof(long long)) {
|
|
#if defined(PRINTF_LONG_LONG_SUPPORT)
|
|
idx += _ntoa_long_long(&buffer[idx], (uintptr_t)va_arg(va, void*), false, 16U, buffer_len - idx, precision, width, flags);
|
|
#endif
|
|
}
|
|
else {
|
|
idx += _ntoa_long(&buffer[idx], (unsigned long)((uintptr_t)va_arg(va, void*)), false, 16U, buffer_len - idx, precision, width, flags);
|
|
}
|
|
format++;
|
|
break;
|
|
}
|
|
|
|
case '%' :
|
|
buffer[idx++] = '%';
|
|
format++;
|
|
break;
|
|
|
|
default :
|
|
buffer[idx++] = *format;
|
|
format++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// termination
|
|
if (buffer_len > 0U) {
|
|
buffer[idx == buffer_len ? buffer_len - 1U : idx] = (char)0;
|
|
}
|
|
|
|
// return written chars without terminating \0
|
|
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;
|
|
}
|