c1a2bb4f83
If the console output buffer is exhausted, characters are silently dropped from the end. Detect this condition and report an error when reading back the characters. Signed-off-by: Simon Glass <sjg@chromium.org>
150 lines
3.9 KiB
C
150 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2000-2009
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*/
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#ifndef __CONSOLE_H
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#define __CONSOLE_H
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#include <stdbool.h>
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#include <stdio_dev.h>
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#include <linux/errno.h>
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extern char console_buffer[];
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/* common/console.c */
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int console_init_f(void); /* Before relocation; uses the serial stuff */
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int console_init_r(void); /* After relocation; uses the console stuff */
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int console_start(int file, struct stdio_dev *sdev); /* Start a console device */
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void console_stop(int file, struct stdio_dev *sdev); /* Stop a console device */
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int console_assign(int file, const char *devname); /* Assign the console */
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int ctrlc(void);
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int had_ctrlc(void); /* have we had a Control-C since last clear? */
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void clear_ctrlc(void); /* clear the Control-C condition */
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int disable_ctrlc(int); /* 1 to disable, 0 to enable Control-C detect */
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int confirm_yesno(void); /* 1 if input is "y", "Y", "yes" or "YES" */
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/**
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* console_search_dev() - search for stdio device with given flags and name
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* @flags: device flags as per input/output/system
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* @name: device name
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*
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* Iterates over registered STDIO devices and match them with given @flags
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* and @name.
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*
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* @return pointer to the &struct stdio_dev if found, or NULL otherwise
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*/
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struct stdio_dev *console_search_dev(int flags, const char *name);
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#ifdef CONFIG_CONSOLE_RECORD
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/**
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* console_record_init() - set up the console recording buffers
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*
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* This should be called as soon as malloc() is available so that the maximum
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* amount of console output can be recorded.
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*
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* @return 0 if OK, -ENOMEM if out of memory
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*/
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int console_record_init(void);
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/**
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* console_record_reset() - reset the console recording buffers
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*
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* Removes any data in the buffers
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*/
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void console_record_reset(void);
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/**
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* console_record_reset_enable() - reset and enable the console buffers
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*
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* This should be called to enable the console buffer.
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*
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* @return 0 (always)
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*/
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int console_record_reset_enable(void);
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/**
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* console_record_readline() - Read a line from the console output
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*
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* This reads the next available line from the console output previously
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* recorded.
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*
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* @str: Place to put string
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* @maxlen: Maximum length of @str including nul terminator
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* @return length of string returned, or -ENOSPC if the console buffer was
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* overflowed by the output
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*/
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int console_record_readline(char *str, int maxlen);
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/**
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* console_record_avail() - Get the number of available bytes in console output
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*
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* @return available bytes (0 if empty)
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*/
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int console_record_avail(void);
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#else
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static inline int console_record_init(void)
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{
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/* Always succeed, since it is not enabled */
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return 0;
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}
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static inline void console_record_reset(void)
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{
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/* Nothing to do here */
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}
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static inline int console_record_reset_enable(void)
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{
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/* Cannot enable it as it is not supported */
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return -ENOSYS;
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}
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static inline int console_record_readline(char *str, int maxlen)
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{
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/* Nothing to read */
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return 0;
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}
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static inline int console_record_avail(void)
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{
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/* There is never anything available */
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return 0;
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}
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#endif /* !CONFIG_CONSOLE_RECORD */
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/**
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* console_announce_r() - print a U-Boot console on non-serial consoles
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*
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* When U-Boot starts up with a display it generally does not announce itself
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* on the display. The banner is instead emitted on the UART before relocation.
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* This function prints a banner on devices which (we assume) did not receive
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* it before relocation.
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*
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* @return 0 (meaning no errors)
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*/
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int console_announce_r(void);
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/**
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* console_puts_select_stderr() - Output a string to selected console devices
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*
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* This writes to stderr only. It is useful for outputting errors
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*
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* @serial_only: true to output only to serial, false to output to everything
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* else
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* @s: String to output
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*/
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void console_puts_select_stderr(bool serial_only, const char *s);
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/*
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* CONSOLE multiplexing.
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*/
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#ifdef CONFIG_CONSOLE_MUX
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#include <iomux.h>
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#endif
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#endif
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