1 /////////////////////////////////////////////////////////////////////////////// 2 // \author (c) Marco Paland (info@paland.com) 3 // 2014-2019, PALANDesign Hannover, Germany 4 // 5 // \license The MIT License (MIT) 6 // 7 // Permission is hereby granted, free of charge, to any person obtaining a copy 8 // of this software and associated documentation files (the "Software"), to deal 9 // in the Software without restriction, including without limitation the rights 10 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 // copies of the Software, and to permit persons to whom the Software is 12 // furnished to do so, subject to the following conditions: 13 // 14 // The above copyright notice and this permission notice shall be included in 15 // all copies or substantial portions of the Software. 16 // 17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 20 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 // THE SOFTWARE. 24 // 25 // \brief Tiny printf, sprintf and snprintf implementation, optimized for speed on 26 // embedded systems with a very limited resources. 27 // Use this instead of bloated standard/newlib printf. 28 // These routines are thread safe and reentrant. 29 // 30 /////////////////////////////////////////////////////////////////////////////// 31 32 #ifndef _LV_PRINTF_H_ 33 #define _LV_PRINTF_H_ 34 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 #include "../lv_conf_internal.h" 41 42 #if LV_SPRINTF_CUSTOM == 0 43 44 #include <stdarg.h> 45 #include <stddef.h> 46 47 /** 48 * Tiny snprintf/vsnprintf implementation 49 * \param buffer A pointer to the buffer where to store the formatted string 50 * \param count The maximum number of characters to store in the buffer, including a terminating null character 51 * \param format A string that specifies the format of the output 52 * \param va A value identifying a variable arguments list 53 * \return The number of characters that COULD have been written into the buffer, not counting the terminating 54 * null character. A value equal or larger than count indicates truncation. Only when the returned value 55 * is non-negative and less than count, the string has been completely written. 56 */ 57 int lv_snprintf(char * buffer, size_t count, const char * format, ...); 58 int lv_vsnprintf(char * buffer, size_t count, const char * format, va_list va); 59 60 #else 61 #include LV_SPRINTF_INCLUDE 62 #endif 63 64 65 #ifdef __cplusplus 66 } 67 #endif 68 69 70 #endif // _PRINTF_H_ 71
