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printf.h
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printf.h
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/*
* This is free and unencumbered software released into the public domain.
* See the LICENSE file for additional details.
*
* Designed by Chris Hooper in 2020.
*
* ---------------------------------------------------------------------
*
* printf() and other stdio emulation.
*/
#ifndef _PRINTF_H
#define _PRINTF_H
#include <stdint.h>
#include <stddef.h>
#include <stdarg.h>
#ifdef __cplusplus
extern "C" {
#endif
#define fprintf _stdio_fprintf
#define fputs _stdio_fputs
#define fputc _stdio_fputc
#define fread _stdio_fread
#define getchar _stdio_getchar
// #define printf _stdio_printf
#define putchar _stdio_putchar
#define puts _stdio_puts
#define snprintf _stdio_snprintf
#define sprintf _stdio_sprintf
#define ungetc _stdio_ungetc
#define vprintf _stdio_vprintf
#define vsnprintf _stdio_vsnprintf
#if 1
#include <stdio.h>
#endif
#undef fprintf
#undef fputs
#undef fputc
#undef fread
#undef getchar
#undef printf
#undef putchar
#undef puts
#undef snprintf
#undef sprintf
#undef stdin
#undef stdout
#undef stderr
#undef ungetc
#undef vprintf
#undef vsnprintf
#undef __sputc_r
#undef __sputc
/* Redefine stdio functions and definitions */
#define stdin ((FILE *) 0)
#define stdout ((FILE *) 1)
#define stderr ((FILE *) 2)
#define fileno(x) (x)
#define fflush(x)
/**
* vsnprintf() is a stdio compatible function which operates on a buffer, size
* format string, and variable argument list. Output is directed
* to the specified buffer.
*
* @param [out] buf - A pointer to the buffer where output is to be stored.
* @param [in] size - The length of the buffer where output is to be stored.
* @param [in] fmt - A string describing the format of the output. This
* format string is compatible with that of printf().
* @param [in] ap - A pointer to a variable list of arguments.
*
* @return The number of characters (not including the trailing '\\0')
* which would have been printed to the output buffer if enough
* space had been available. Thus, a return value greater than or
* equal to the given size indicates that the output was truncated.
*/
__attribute__((format(__printf__, 3, 0)))
int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap);
/**
* snprintf() is a stdio compatible function which operates on a buffer, size,
* format string, and variable argument list. Output is directed
* to the specified buffer.
*
* @param [out] buf - A pointer to the buffer where output is to be stored.
* @param [in] size - The length of the buffer where output is to be stored.
* @param [in] fmt - A string describing the format of the output. This
* format string is compatible with that of printf().
* @param [in] ... - A variable list of arguments.
*
* @return The number of characters (not including the trailing '\\0')
* which would have been printed to the output buffer if enough
* space had been available. Thus, a return value greater than or
* equal to the given size indicates that the output was truncated.
*/
__attribute__((format(__printf__, 3, 4)))
int snprintf(char *buf, size_t size, const char *fmt, ...);
/**
* sprintf() is a stdio compatible function which operates on a buffer,
* format string, and variable argument list. Output is directed
* to the specified buffer. A maximum of 80 characters (including the
* terminating '\\0') may be written to the buffer. Use snprintf() to
* write larger buffers.
*
* @param [out] buf - A pointer to the buffer where output is to be stored.
* @param [in] fmt - A string describing the format of the output. This
* format string is compatible with that of printf().
* @param [in] ... - A variable list of arguments.
*
* @return The number of characters (not including the trailing '\\0') that
* would have been written to the buffer if the output was not
* limited to 80 bytes.
*
* @see snprintf();
*/
__attribute__((format(__printf__, 2, 3)))
int sprintf(char *buf, const char *fmt, ...);
/**
* vprintf() is a stdio compatible function which operates on a format
* string and variable argument list. Output is directed to
* the serial console.
*
* @param [in] fmt - A string describing the format of the output. This
* format string is compatible with that of printf().
* @param [in] ap - A pointer to a variable list of arguments.
*
* @return The number of characters written to the serial console.
*/
__attribute__((format(__printf__, 1, 0)))
int vprintf(const char *fmt, va_list ap);
/**
* printf() is a stdio compatible function which operates on a format
* string and variable argument list. Output is directed to
* the serial console.
*
* @param [in] fmt - A string describing the format of the output. This
* format string is compatible with that of printf().
* @param [in] ... - A variable list of arguments.
*
* @return The number of characters written to the serial console.
*/
__attribute__((format(__printf__, 1, 2)))
int printf(const char *fmt, ...);
/*
* scanf() uses a format string to derive specified values from input buffer>
*
* @param [in] str - A file pointer which is used to describe the input
* buffer.
* @param [in] fmt - The scanf() format string to process.
* @param [out] ... - A variable list of arguments.
*
* @return The number of format items successfully matched and assigned.
*/
__attribute__((format(__scanf__, 1, 3)))
int sscanf(const char *str, char const *fmt, ...);
int putchar(int ch);
int puts(const char *str);
#ifdef __cplusplus
}
#endif
#undef DO_PRINTF_TEST
#ifdef DO_PRINTF_TEST
/**
* printf_test() is a quick function to test various printf() features.
* Output may be compared against the stdio printf() function
* by defining the CHECK_AGAINST_HOST_PRINTF macro in printf.h.
*
* This function requires no arguments.
*
* @return None.
*/
int printf_test(void);
#endif
#define EXIT_FAILURE 1
#endif /* _PRINTF_H */