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