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include/liblvgl/misc/lv_printf.h

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+///////////////////////////////////////////////////////////////////////////////
+// \author (c) Marco Paland ([email protected])
+//             2014-2019, PALANDesign Hannover, Germany
+//
+// \license The MIT License (MIT)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+// \brief Tiny printf, sprintf and snprintf implementation, optimized for speed on
+//        embedded systems with a very limited resources.
+//        Use this instead of bloated standard/newlib printf.
+//        These routines are thread safe and reentrant.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+/*Original repository: https://github.com/mpaland/printf*/
+
+#ifndef _LV_PRINTF_H_
+#define _LV_PRINTF_H_
+
+#if defined(__has_include)
+    #if __has_include(<inttypes.h>)
+        #include <inttypes.h>
+        /* platform-specific printf format for int32_t, usually "d" or "ld" */
+        #define LV_PRId32 PRId32
+        #define LV_PRIu32 PRIu32
+    #else
+        #define LV_PRId32 "d"
+        #define LV_PRIu32 "u"
+    #endif
+#else
+    /* hope this is correct for ports without __has_include or without inttypes.h */
+    #define LV_PRId32 "d"
+    #define LV_PRIu32 "u"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "../lv_conf_internal.h"
+
+#if LV_SPRINTF_CUSTOM == 0
+
+#include <stdarg.h>
+#include <stddef.h>
+
+#include "lv_types.h"
+
+typedef struct {
+    const char * fmt;
+    va_list * va;
+} lv_vaformat_t;
+
+/**
+ * Tiny snprintf/vsnprintf implementation
+ * \param buffer A pointer to the buffer where to store the formatted string
+ * \param count The maximum number of characters to store in the buffer, including a terminating null character
+ * \param format A string that specifies the format of the output
+ * \param va A value identifying a variable arguments list
+ * \return The number of characters that COULD have been written into the buffer, not counting the terminating
+ *         null character. A value equal or larger than count indicates truncation. Only when the returned value
+ *         is non-negative and less than count, the string has been completely written.
+ */
+int  lv_snprintf(char * buffer, size_t count, const char * format, ...) LV_FORMAT_ATTRIBUTE(3, 4);
+int lv_vsnprintf(char * buffer, size_t count, const char * format, va_list va) LV_FORMAT_ATTRIBUTE(3, 0);
+
+#else
+#include LV_SPRINTF_INCLUDE
+#endif
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif  // _LV_PRINTF_H_