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stdio: Remove __libc_message alloca usage

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Use a fixed size array instead.  The maximum number of arguments
is set by macro tricks.

Co-authored-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Joe Simmons-Talbott
2023-09-11 16:16:49 +00:00
parent a43003ebf6
commit 5f798d38e9
2 changed files with 41 additions and 35 deletions
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29
include/stdio.h
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@@ -172,10 +172,37 @@ extern int __gen_tempname (char *__tmpl, int __suffixlen, int __flags,
and abort. */
extern void __libc_fatal (const char *__message)
__attribute__ ((__noreturn__));
_Noreturn void __libc_message (const char *__fnt, ...) attribute_hidden;
extern void __fortify_fail (const char *msg) __attribute__ ((__noreturn__));
libc_hidden_proto (__fortify_fail)
/* The maximum number of varargs allowed in a __libc_message format string */
#define LIBC_MESSAGE_MAX_ARGS 4
_Noreturn void __libc_message_impl (const char *__fnt, ...) attribute_hidden
__attribute__ ((__format__ (__printf__, 1, 2)));
#define __libc_message0(fmt) \
__libc_message_impl (fmt)
#define __libc_message1(fmt, a1) \
__libc_message_impl (fmt, a1)
#define __libc_message2(fmt, a1, a2) \
__libc_message_impl (fmt, a1, a2)
#define __libc_message3(fmt, a1, a2, a3) \
__libc_message_impl (fmt, a1, a2, a3)
#define __libc_message4(fmt, a1, a2, a3, a4) \
__libc_message_impl (fmt, a1, a2, a3, a4)
#define __libc_message_concat_x(a,b) a##b
#define __libc_message_concat(a,b) __libc_message_concat_x (a, b)
#define __libc_message_nargs_x(a0,a1,a2,a3,a4,a5,a6,...) a6
#define __libc_message_nargs(b, ...) \
__libc_message_nargs_x (__VA_ARGS__,6,5,4,3,2,1,0,)
#define __libc_message_disp(b, ...) \
__libc_message_concat (b, __libc_message_nargs (__VA_ARGS__))(__VA_ARGS__)
#define __libc_message(...) \
__libc_message_disp (__libc_message, __VA_ARGS__)
/* Acquire ownership of STREAM. */
extern void __flockfile (FILE *__stream) attribute_hidden;