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console: Implement flush() function

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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>
This commit is contained in:
Pali Rohár
2022-09-05 11:31:17 +02:00
committed by Tom Rini
parent 7df5b35334
commit 974f48366f
5 changed files with 92 additions and 0 deletions
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15
include/stdio.h
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@@ -15,6 +15,11 @@ int tstc(void);
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
@@ -26,6 +31,10 @@ static inline void puts(const char *s)
{
}
static inline void flush(void)
{
}
static inline int __printf(1, 2) printf(const char *fmt, ...)
{
return 0;
@@ -48,11 +57,17 @@ static inline int vprintf(const char *fmt, va_list args)
/* 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);