lineconsole.c File Reference

Line-based console. More...

#include <stdint.h>
#include <stddef.h>
#include <ipxe/ansiesc.h>
#include <ipxe/lineconsole.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
size_t	line_putchar (struct line_console *line, int character)
	Print a character to a line-based console. More...

Detailed Description

Line-based console.

Definition in file lineconsole.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

line_putchar()

size_t line_putchar	(	struct line_console *	line,
		int	character
	)

Print a character to a line-based console.

Parameters

character

Character to be printed

Return values

print

Print line

Definition at line 43 of file lineconsole.c.

                                                                 {

        /* Strip ANSI escape sequences */
        character = ansiesc_process ( &line->ctx, character );
        if ( character < 0 )
                return 0;

        /* Handle backspace characters */
        if ( character == '\b' ) {
                if ( line->index )
                        line->index--;
                return 0;
        }

        /* Ignore carriage return */
        if ( character == '\r' )
                return 0;

        /* Treat newline as a terminator */
        if ( character == '\n' )
                character = 0;

        /* Add character to buffer */
        line->buffer[line->index++] = character;

        /* Do nothing more unless we reach end-of-line (or end-of-buffer) */
        if ( ( character != 0 ) &&
             ( line->index < ( line->len - 1 /* NUL */ ) ) ) {
                return 0;
        }

        /* Reset to start of buffer */
        line->index = 0;

        return 1;
}

References ansiesc_process(), line_console::buffer, line_console::ctx, line_console::index, and line_console::len.

Referenced by syslog_putchar(), syslogs_putchar(), and vmconsole_putchar().