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FORTIFY_SOURCE: add snprintf, vsnprintf

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Add _FORTIFY_SOURCE support for snprintf, vsnprintf

At this time, we opt out of these protections for clang, as clang
does not implement __builtin_va_arg_pack().

http://clang.llvm.org/docs/UsersManual.html#c_unimpl_gcc

Change-Id: I73ebe5ec8dad1dca8898a76d6afb693a25f75375
This commit is contained in:
Nick Kralevich
2012-06-11 15:50:57 -07:00
parent 85b06f9365
commit cffdf6693f
4 changed files with 149 additions and 0 deletions
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28
libc/include/stdio.h
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@@ -458,4 +458,32 @@ int vfdprintf(int, const char*, __va_list);
__END_DECLS
#endif /* _GNU_SOURCE */
#if defined(__BIONIC_FORTIFY_INLINE)
__BIONIC_FORTIFY_INLINE
__attribute__((__format__ (printf, 3, 0)))
__attribute__((__nonnull__ (3)))
int vsnprintf(char *str, size_t size, const char *format, __va_list ap)
{
return __builtin___vsnprintf_chk(str, size, 0, __builtin_object_size(str, 0), format, ap);
}
# if !defined(__clang__)
/*
* Clang doesn't have support for __builtin_va_arg_pack()
* http://clang.llvm.org/docs/UsersManual.html#c_unimpl_gcc
*/
__BIONIC_FORTIFY_INLINE
__attribute__((__format__ (printf, 3, 4)))
__attribute__((__nonnull__ (3)))
int snprintf(char *str, size_t size, const char *format, ...)
{
return __builtin___snprintf_chk(str, size, 0, __builtin_object_size(str, 0), format, __builtin_va_arg_pack());
}
# endif /* !defined(__clang__) */
#endif /* defined(__BIONIC_FORTIFY_INLINE) */
#endif /* _STDIO_H_ */