printf.h
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1 ///////////////////////////////////////////////////////////////////////////////
2 // \author (c) Marco Paland (info@paland.com)
3 // 2014-2019, PALANDesign Hannover, Germany
4 //
5 // \license The MIT License (MIT)
6 //
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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 _PRINTF_H_
33 #define _PRINTF_H_
34 
35 #include <stdarg.h>
36 #include <stddef.h>
37 
38 
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42 
43 
44 /**
45  * Output a character to a custom device like UART, used by the printf() function
46  * This function is declared here only. You have to write your custom implementation somewhere
47  * \param character Character to output
48  */
49 void _putchar(char character);
50 
51 
52 /**
53  * Tiny printf implementation
54  * You have to implement _putchar if you use printf()
55  * To avoid conflicts with the regular printf() API it is overridden by macro defines
56  * and internal underscore-appended functions like printf_() are used
57  * \param format A string that specifies the format of the output
58  * \return The number of characters that are written into the array, not counting the terminating null character
59  */
60 #define printf printf_
61 int printf_(const char* format, ...);
62 
63 
64 /**
65  * Tiny sprintf implementation
66  * Due to security reasons (buffer overflow) YOU SHOULD CONSIDER USING (V)SNPRINTF INSTEAD!
67  * \param buffer A pointer to the buffer where to store the formatted string. MUST be big enough to store the output!
68  * \param format A string that specifies the format of the output
69  * \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
70  */
71 #define sprintf sprintf_
72 int sprintf_(char* buffer, const char* format, ...);
73 
74 
75 /**
76  * Tiny snprintf/vsnprintf implementation
77  * \param buffer A pointer to the buffer where to store the formatted string
78  * \param count The maximum number of characters to store in the buffer, including a terminating null character
79  * \param format A string that specifies the format of the output
80  * \param va A value identifying a variable arguments list
81  * \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
82  * If the formatted string is truncated the buffer size (count) is returned
83  */
84 #define snprintf snprintf_
85 #define vsnprintf vsnprintf_
86 int snprintf_(char* buffer, size_t count, const char* format, ...);
87 int vsnprintf_(char* buffer, size_t count, const char* format, va_list va);
88 
89 
90 /**
91  * Tiny vprintf implementation
92  * \param format A string that specifies the format of the output
93  * \param va A value identifying a variable arguments list
94  * \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
95  */
96 #define vprintf vprintf_
97 int vprintf_(const char* format, va_list va);
98 
99 
100 /**
101  * printf with output function
102  * You may use this as dynamic alternative to printf() with its fixed _putchar() output
103  * \param out An output function which takes one character and an argument pointer
104  * \param arg An argument pointer for user data passed to output function
105  * \param format A string that specifies the format of the output
106  * \return The number of characters that are sent to the output function, not counting the terminating null character
107  */
108 int fctprintf(void (*out)(char character, void* arg), void* arg, const char* format, ...);
109 
110 
111 /**
112  * vprintf with output function
113  * You may use this as dynamic alternative to vprintf() with its fixed _putchar() output
114  * \param out An output function which takes one character and an argument pointer
115  * \param arg An argument pointer for user data passed to output function
116  * \param format A string that specifies the format of the output
117  * \param va A value identifying a variable arguments list
118  * \return The number of characters that are sent to the output function, not counting the terminating null character
119  */
120 int fctvprintf(void (*out)(char character, void* arg), void* arg, const char* format, va_list va);
121 
122 #ifdef __cplusplus
123 }
124 #endif
125 
126 
127 #endif // _PRINTF_H_
_putchar
void _putchar(char character)
fctvprintf
int fctvprintf(void(*out)(char character, void *arg), void *arg, const char *format, va_list va)
Definition: printf.c:915
vprintf_
int vprintf_(const char *format, va_list va)
Definition: printf.c:892
fctprintf
int fctprintf(void(*out)(char character, void *arg), void *arg, const char *format,...)
Definition: printf.c:905
printf_
int printf_(const char *format,...)
Definition: printf.c:861
sprintf_
int sprintf_(char *buffer, const char *format,...)
Definition: printf.c:872
vsnprintf_
int vsnprintf_(char *buffer, size_t count, const char *format, va_list va)
Definition: printf.c:899
snprintf_
int snprintf_(char *buffer, size_t count, const char *format,...)
Definition: printf.c:882