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974f48366f
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>
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
#ifndef __STDIO_H
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#define __STDIO_H
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#include <stdarg.h>
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#include <linux/compiler.h>
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/* stdin */
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int getchar(void);
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int tstc(void);
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/* stdout */
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#if !defined(CONFIG_SPL_BUILD) || \
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(defined(CONFIG_TPL_BUILD) && defined(CONFIG_TPL_SERIAL)) || \
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(defined(CONFIG_SPL_BUILD) && !defined(CONFIG_TPL_BUILD) && \
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defined(CONFIG_SPL_SERIAL))
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void putc(const char c);
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void puts(const char *s);
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#ifdef CONFIG_CONSOLE_FLUSH_SUPPORT
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void flush(void);
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#else
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static inline void flush(void) {}
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#endif
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int __printf(1, 2) printf(const char *fmt, ...);
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int vprintf(const char *fmt, va_list args);
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#else
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static inline void putc(const char c)
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{
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}
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static inline void puts(const char *s)
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{
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}
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static inline void flush(void)
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{
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}
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static inline int __printf(1, 2) printf(const char *fmt, ...)
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{
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return 0;
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}
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static inline int vprintf(const char *fmt, va_list args)
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{
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return 0;
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}
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#endif
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/*
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* FILE based functions (can only be used AFTER relocation!)
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*/
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#define stdin 0
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#define stdout 1
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#define stderr 2
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#define MAX_FILES 3
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/* stderr */
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#define eputc(c) fputc(stderr, c)
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#define eputs(s) fputs(stderr, s)
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#define eflush() fflush(stderr)
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#define eprintf(fmt, args...) fprintf(stderr, fmt, ##args)
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int __printf(2, 3) fprintf(int file, const char *fmt, ...);
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void fputs(int file, const char *s);
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void fputc(int file, const char c);
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#ifdef CONFIG_CONSOLE_FLUSH_SUPPORT
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void fflush(int file);
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#else
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static inline void fflush(int file) {}
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#endif
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int ftstc(int file);
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int fgetc(int file);
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#endif /* __STDIO_H */
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