Air quality sensor
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/**
* Console IO functions.
*
* This header is included internally by console.h
*
* Created on 2020/04/09.
*/
#ifndef LIBCONSOLE_IO_H
#define LIBCONSOLE_IO_H
#ifndef LIBCONSOLE_H
#error Include console.h!
#endif
#include <stdarg.h>
// ------ If the FILE based IO streams option is OFF, these are extern -------
/**
* Write to console context.
*
* In command context, the more convenient "console_write", "console_print", "console_println"
* and "console_printf" functions can be used instead.
*
* This function is a Linenoise write callback.
*
* Return number of characters written, -1 on error.
*/
extern int console_write_ctx(console_ctx_t *ctx, const char *text, size_t len);
/**
* Read from console context's input stream.
*
* In command context, the more convenient "console_read" function and the
* "console_can_read" and "console_have_stdin" helper functions can be used instead.
*
* This is also a Linenoise read callback.
*
* Return number of characters read, -1 on error
*/
extern int console_read_ctx(console_ctx_t *ctx, char *dest, size_t count);
/**
* Check if console input stream has bytes ready.
*
* @return number of queued bytes, 0 if none, -1 on error.
*/
extern int console_can_read_ctx(console_ctx_t *ctx);
/**
* Test if console context is not NULL and has stdin stream available
*
* @return have stdin
*/
extern bool console_have_stdin_ctx(console_ctx_t *ctx);
// ----- end extern interface -----
/**
* Print zero-terminated string to to console output
*
* @param text - characters to write
* @return number of characters written, or -1 on error
*/
int console_print_ctx(console_ctx_t *ctx, const char *text);
/**
* Print zero-terminated string to console output, followed by a newline
*
* @param text - characters to write
* @return number of characters written, or -1 on error
*/
ssize_t console_println_ctx(console_ctx_t *ctx, const char *text);
/**
* Console printf
*
* @param ctx - console context
* @param color - color to use, COLOR_RESET = default
* @param format
* @param ...
* @return bytes written, or -1 on error
*/
ssize_t console_printf_ctx(console_ctx_t *ctx, console_color_t color, const char *format, ...) __attribute__((format(printf,3,4)));
/**
* Console vprintf
*
* @param ctx - console context
* @param color - color to use, COLOR_RESET = default
* @param format - format string
* @param args - varargs passed as a va_list
* @return bytes written, or -1 on error
*/
ssize_t console_vprintf_ctx(console_ctx_t *ctx, console_color_t color, const char *format, va_list args);
/**
* Write to console output
*
* @attention Can only be used within a console command context
*
* @param text - characters to write
* @param len - text length
* @return number of characters written, or -1 on error
*/
ssize_t console_write(const char *text, size_t len);
// -------------------- Convenience functions -------------------------
/**
* Test if we are in the console command context.
*
* @return in command context
*/
static inline bool console_context_available(void) {
return console_active_ctx != NULL;
}
/**
* Test if we are in the console command context AND the console context has an input stream
* (input stream may be used in interactive commands)
*
* @return have stdin
*/
bool console_have_stdin(void);
/**
* Console printf. Defined as a macro to pass variadic arguments
*
* @attention Can only be used within a console command context
*
* @param format
* @param ...
* @return bytes written, or -1 on error
*/
#define console_printf(format, ...) console_printf_ctx(console_active_ctx, COLOR_RESET, format, ##__VA_ARGS__)
/**
* Console printf with colors. Defined as a macro to pass variadic arguments
*
* @attention Can only be used within a console command context
*
* @param color - from console_colors_t enum
* @param format
* @param ...
* @return bytes written, or -1 on error
*/
#define console_color_printf(color, format, ...) console_printf_ctx(console_active_ctx, color, format, ##__VA_ARGS__)
/**
* Read from console input
*
* @attention Can only be used within a console command context
*
* @param dest - destination buffer
* @param count - how many characters to read
* @return number of characters read, or -1 on error
*/
ssize_t console_read(char *dest, size_t count);
/**
* Check if console input stream has bytes ready.
*
* @attention Can only be used within a console command context
*
* @return number of queued bytes, 0 if none, -1 on error.
*/
int console_can_read(void);
/**
* Print zero-terminated string to to console output
*
* @attention Can only be used within a console command context
*
* @param text - characters to write
* @return number of characters written, or -1 on error
*/
static inline int console_print(const char *text) {
return console_print_ctx(console_active_ctx, text);
}
/**
* Print zero-terminated string to console output, followed by a newline
*
* @attention Can only be used within a console command context
*
* @param text - characters to write
* @return number of characters written, or -1 on error
*/
ssize_t console_println(const char *text);
#endif //LIBCONSOLE_IO_H