diff -r e79a60b3a7cb -r 7c3ff86ee9d4 ucx/cx/printf.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/cx/printf.h	Tue May 23 11:11:28 2023 +0200
@@ -0,0 +1,166 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * \file printf.h
+ * \brief Wrapper for write functions with a printf-like interface.
+ * \author Mike Becker
+ * \author Olaf Wintermann
+ * \version 3.0
+ * \copyright 2-Clause BSD License
+ */
+
+#ifndef UCX_PRINTF_H
+#define UCX_PRINTF_H
+
+#include "common.h"
+#include "string.h"
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * A \c fprintf like function which writes the output to a stream by
+ * using a write_func.
+ *
+ * @param stream the stream the data is written to
+ * @param wfc the write function
+ * @param fmt format string
+ * @param ... additional arguments
+ * @return the total number of bytes written
+ */
+__attribute__((__nonnull__(1, 2, 3), __format__(printf, 3, 4)))
+int cx_fprintf(
+        void *stream,
+        cx_write_func wfc,
+        char const *fmt,
+        ...
+);
+
+/**
+ * A \c vfprintf like function which writes the output to a stream by
+ * using a write_func.
+ *
+ * @param stream the stream the data is written to
+ * @param wfc the write function
+ * @param fmt format string
+ * @param ap argument list
+ * @return the total number of bytes written
+ * @see cx_fprintf()
+ */
+__attribute__((__nonnull__))
+int cx_vfprintf(
+        void *stream,
+        cx_write_func wfc,
+        char const *fmt,
+        va_list ap
+);
+
+/**
+ * A \c asprintf like function which allocates space for a string
+ * the result is written to.
+ *
+ * \note The resulting string is guaranteed to be zero-terminated.
+ *
+ * @param allocator the CxAllocator used for allocating the string
+ * @param fmt format string
+ * @param ... additional arguments
+ * @return the formatted string
+ * @see cx_strfree_a()
+ */
+__attribute__((__nonnull__(1, 2), __format__(printf, 2, 3)))
+cxmutstr cx_asprintf_a(
+        CxAllocator const *allocator,
+        char const *fmt,
+        ...
+);
+
+/**
+ * A \c asprintf like function which allocates space for a string
+ * the result is written to.
+ *
+ * \note The resulting string is guaranteed to be zero-terminated.
+ *
+ * @param fmt format string
+ * @param ... additional arguments
+ * @return the formatted string
+ * @see cx_strfree()
+ */
+#define cx_asprintf(fmt, ...) \
+    cx_asprintf_a(cxDefaultAllocator, fmt, __VA_ARGS__)
+
+/**
+* A \c vasprintf like function which allocates space for a string
+ * the result is written to.
+ *
+ * \note The resulting string is guaranteed to be zero-terminated.
+ *
+ * @param allocator the CxAllocator used for allocating the string
+ * @param fmt format string
+ * @param ap argument list
+ * @return the formatted string
+ * @see cx_asprintf_a()
+ */
+__attribute__((__nonnull__))
+cxmutstr cx_vasprintf_a(
+        CxAllocator const *allocator,
+        char const *fmt,
+        va_list ap
+);
+
+/**
+* A \c vasprintf like function which allocates space for a string
+ * the result is written to.
+ *
+ * \note The resulting string is guaranteed to be zero-terminated.
+ *
+ * @param fmt format string
+ * @param ap argument list
+ * @return the formatted string
+ * @see cx_asprintf()
+ */
+#define cx_vasprintf(fmt, ap) cx_vasprintf_a(cxDefaultAllocator, fmt, ap)
+
+/**
+ * A \c printf like function which writes the output to a CxBuffer.
+ *
+ * @param buffer a pointer to the buffer the data is written to
+ * @param fmt the format string
+ * @param ... additional arguments
+ * @return the total number of bytes written
+ * @see ucx_fprintf()
+ */
+#define cx_bprintf(buffer, fmt, ...) cx_fprintf((CxBuffer*)buffer, \
+    (cx_write_func) cxBufferWrite, fmt, __VA_ARGS__)
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif //UCX_PRINTF_H