libkernaux/include/kernaux/printf.h

#ifndef KERNAUX_INCLUDED_PRINTF
#define KERNAUX_INCLUDED_PRINTF

#ifdef __cplusplus
extern "C" {
#endif

#include <stdarg.h>
#include <stddef.h>

/**
 * Tiny [v]fprintf implementation
 * \param out An output function
 * \param data Additional data for the output function
 * \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 are sent to the output function, not counting the terminating null character
 */
int  kernaux_fprintf(void (*out)(char, void*), void *data, const char* format, ...);
int kernaux_vfprintf(void (*out)(char, void*), void *data, const char* format, va_list va);

/**
 * Tiny [v]snprintf 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  kernaux_snprintf(char* buffer, size_t count, const char* format, ...);
int kernaux_vsnprintf(char* buffer, size_t count, const char* format, va_list va);

/**
 * Tiny sprintf implementation
 * Due to security reasons (buffer overflow) YOU SHOULD CONSIDER USING (V)SNPRINTF INSTEAD!
 * \param buffer A pointer to the buffer where to store the formatted string. MUST be big enough to store the output!
 * \param format A string that specifies the format of the output
 * \return The number of characters that are WRITTEN into the buffer, not counting the terminating null character
 */
int kernaux_sprintf(char* buffer, const char* format, ...);

#ifdef __cplusplus
}
#endif

#endif