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Fix variable argument list traversal for doubles. 

* include/stdarg.h (va_align): New macro.
(va_arg8): New macro.
* lib/stdio/vfprintf.c (vfprintf): Use it.
* lib/stdio/vsnprintf.c (vsnprintf): Use it.
This commit is contained in:
Danny Milosavljevic 2019-03-15 03:04:56 +01:00 committed by Jan Nieuwenhuizen
parent 4d55c843dc
commit 809aa3f03a
No known key found for this signature in database
GPG Key ID: F3C1A0D9C1D65273
3 changed files with 4 additions and 2 deletions
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2
include/stdarg.h
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@ -34,6 +34,8 @@
typedef char *va_list;
#define va_start(ap, last) (void)((ap) = (char*)(&(last) + 1))
#define va_arg(ap, type) (type)(((long*)((ap) = ((ap) + sizeof (void*))))[-1])
#define va_align(ap, alignment) ((((unsigned long) (unsigned char*) ap) + (alignment) - 1) &~ (alignment - 1))
#define va_arg8(ap, type) (type)(((double*)((ap) = (va_align((ap), 8) + sizeof(double))))[-1])
#define va_end(ap) (void)((ap) = 0)
#define va_copy(dest, src) dest = src

2
lib/stdio/vfprintf.c
View File

@ -188,7 +188,7 @@ vfprintf (FILE * f, char const *format, va_list ap)
case 'g':
case 'G':
{
double d = va_arg (ap, double);
double d = va_arg8 (ap, double);
char *s = dtoab (d, 10, 1);
if (c == 'E' || c == 'G')
strupr (s);

2
lib/stdio/vsnprintf.c
View File

@ -204,7 +204,7 @@ vsnprintf (char *str, size_t size, char const *format, va_list ap)
case 'g':
case 'G':
{
double d = va_arg (ap, double);
double d = va_arg8 (ap, double);
char *s = dtoab (d, 10, 1);
if (c == 'E' || c == 'G')
strupr (s);