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u-boot/include/stdio.h
Pali Rohár 974f48366f console: Implement flush() function
On certain places it is required to flush output print buffers to ensure
that text strings were sent to console or serial devices. For example when
printing message that U-Boot is going to boot kernel or when U-Boot is
going to change baudrate of terminal device.

Therefore introduce a new flush() and fflush() functions into console code.
These functions will call .flush callback of associated stdio_dev device.

As this function may increase U-Boot side, allow to compile U-Boot without
this function. For this purpose there is a new config CONSOLE_FLUSH_SUPPORT
which is enabled by default and can be disabled. It is a good idea to have
this option enabled for all boards which have enough space for it.

When option is disabled when U-Boot defines just empty static inline
function fflush() to avoid ifdefs in other code.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-09-24 10:47:01 -04:00

74 lines
1.5 KiB
C

#ifndef __STDIO_H
#define __STDIO_H
#include <stdarg.h>
#include <linux/compiler.h>
/* stdin */
int getchar(void);
int tstc(void);
/* stdout */
#if !defined(CONFIG_SPL_BUILD) || \
(defined(CONFIG_TPL_BUILD) && defined(CONFIG_TPL_SERIAL)) || \
(defined(CONFIG_SPL_BUILD) && !defined(CONFIG_TPL_BUILD) && \
defined(CONFIG_SPL_SERIAL))
void putc(const char c);
void puts(const char *s);
#ifdef CONFIG_CONSOLE_FLUSH_SUPPORT
void flush(void);
#else
static inline void flush(void) {}
#endif
int __printf(1, 2) printf(const char *fmt, ...);
int vprintf(const char *fmt, va_list args);
#else
static inline void putc(const char c)
{
}
static inline void puts(const char *s)
{
}
static inline void flush(void)
{
}
static inline int __printf(1, 2) printf(const char *fmt, ...)
{
return 0;
}
static inline int vprintf(const char *fmt, va_list args)
{
return 0;
}
#endif
/*
* FILE based functions (can only be used AFTER relocation!)
*/
#define stdin 0
#define stdout 1
#define stderr 2
#define MAX_FILES 3
/* stderr */
#define eputc(c) fputc(stderr, c)
#define eputs(s) fputs(stderr, s)
#define eflush() fflush(stderr)
#define eprintf(fmt, args...) fprintf(stderr, fmt, ##args)
int __printf(2, 3) fprintf(int file, const char *fmt, ...);
void fputs(int file, const char *s);
void fputc(int file, const char c);
#ifdef CONFIG_CONSOLE_FLUSH_SUPPORT
void fflush(int file);
#else
static inline void fflush(int file) {}
#endif
int ftstc(int file);
int fgetc(int file);
#endif /* __STDIO_H */