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Add safe vsnprintf and snprintf library functions

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From: Sonny Rao <sonnyrao@chromium.org>

These functions are useful in U-Boot because they allow a graceful failure
rather than an unpredictable stack overflow when printf() buffers are
exceeded.

Mostly copied from the Linux kernel. I copied vscnprintf and
scnprintf so we can change printf and vprintf to use the safe
implementation but still return the correct values.

(Simon Glass <sjg@chromium.org> modified this commit a little)

Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
This commit is contained in:
Sonny Rao
2011-11-02 09:52:08 +00:00
committed by Wolfgang Denk
parent 9785c905cf
commit 046a37bd53
3 changed files with 241 additions and 52 deletions
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19
include/vsprintf.h
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@@ -36,4 +36,23 @@ int sprintf(char *buf, const char *fmt, ...)
int vsprintf(char *buf, const char *fmt, va_list args);
char *simple_itoa(ulong i);
#ifdef CONFIG_SYS_VSNPRINTF
int snprintf(char *buf, size_t size, const char *fmt, ...)
__attribute__ ((format (__printf__, 3, 4)));
int scnprintf(char *buf, size_t size, const char *fmt, ...)
__attribute__ ((format (__printf__, 3, 4)));
int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
#else
/*
* Use macros to silently drop the size parameter. Note that the 'cn'
* versions are the same as the 'n' versions since the functions assume
* there is always enough buffer space when !CONFIG_SYS_VSNPRINTF
*/
#define snprintf(buf, size, fmt, args...) sprintf(buf, fmt, ##args)
#define scnprintf(buf, size, fmt, args...) sprintf(buf, fmt, ##args)
#define vsnprintf(buf, size, fmt, args...) vsprintf(buf, fmt, ##args)
#define vscnprintf(buf, size, fmt, args...) vsprintf(buf, fmt, ##args)
#endif /* CONFIG_SYS_VSNPRINTF */
#endif