1 /*
2  * Copyright (c) 2008 Travis Geiselbrecht
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining
5  * a copy of this software and associated documentation files
6  * (the "Software"), to deal in the Software without restriction,
7  * including without limitation the rights to use, copy, modify, merge,
8  * publish, distribute, sublicense, and/or sell copies of the Software,
9  * and to permit persons to whom the Software is furnished to do so,
10  * subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice shall be
13  * included in all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22  */
23 #ifndef __LIB_PRINTF_H
24 #define __LIB_PRINTF_H
25 
26 #include <stdarg.h>
27 #include <lk/compiler.h>
28 #include <stddef.h>
29 
30 __BEGIN_CDECLS
31 
32 /* printf engine that parses the format string and generates output */
33 
34 /* function pointer to pass the printf engine, called back during the formatting.
35  * input is a string to output, length bytes to output,
36  * return code is number of characters that would have been written, or error code (if negative)
37  */
38 typedef int (*_printf_engine_output_func)(const char *str, size_t len, void *state);
39 
40 int _printf_engine(_printf_engine_output_func out, void *state, const char *fmt, va_list ap);
41 
42 __END_CDECLS
43 
44 #endif
45