Patchwork [3/9] Use SCANF_ISOC99_A instead of _IO_FLAGS2_SCANF_STD.

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Submitter Zack Weinberg
Date March 7, 2018, 7:31 p.m.
Message ID <20180307193205.4751-4-zackw@panix.com>
Download mbox | patch
Permalink /patch/26227/
State New
Headers show

Comments

Zack Weinberg - March 7, 2018, 7:31 p.m.
Change the callers of __vfscanf_internal and __vfwscanf_internal that
want C99-compliant behavior to communicate this via the new flags
argument, rather than setting bits on the FILE object.  This also
means these functions do not need to do their own locking.

	* stdio-common/isoc99_scanf.c
	* stdio-common/isoc99_fscanf.c
	* stdio-common/isoc99_sscanf.c
	* stdio-common/isoc99_vscanf.c
	* stdio-common/isoc99_vfscanf.c
	* stdio-common/isoc99_vsscanf.c
	* wcsmbs/isoc99_wscanf.c
	* wcsmbs/isoc99_fwscanf.c
	* wcsmbs/isoc99_swscanf.c
	* wcsmbs/isoc99_vwscanf.c
	* wcsmbs/isoc99_vfwscanf.c
	* wcsmbs/isoc99_vswscanf.c:
	Pass SCANF_ISOC99_A to __vfscanf_internal and/or __vfwscanf_internal.
	Do not set _IO_FLAGS2_SCANF_STD on the FILE passed to that function.
	No need to lock and unlock the FILE passed to that function.

	* stdio-common/vfscanf-internal.c
	(__vfscanf_internal, __vfwscanf_internal):
	Don't look at _IO_FLAGS2_SCANF_STD.
	* libio/libioP.h (_IO_acquire_lock_clear_flags2_fct)
	(_IO_release_lock): Don't clear _IO_FLAGS2_SCANF_STD.
	* libio/libio.h (_IO_FLAGS2_SCANF_STD): Delete.
---
 libio/libio.h                   |  1 -
 libio/libioP.h                  |  5 ++---
 stdio-common/isoc99_fscanf.c    |  6 +-----
 stdio-common/isoc99_scanf.c     | 13 ++-----------
 stdio-common/isoc99_sscanf.c    |  3 +--
 stdio-common/isoc99_vfscanf.c   |  8 +-------
 stdio-common/isoc99_vscanf.c    |  8 +-------
 stdio-common/isoc99_vsscanf.c   |  3 +--
 stdio-common/vfscanf-internal.c |  2 --
 wcsmbs/isoc99_fwscanf.c         |  6 +-----
 wcsmbs/isoc99_swscanf.c         |  3 +--
 wcsmbs/isoc99_vfwscanf.c        |  8 +-------
 wcsmbs/isoc99_vswscanf.c        |  3 +--
 wcsmbs/isoc99_vwscanf.c         |  8 +-------
 wcsmbs/isoc99_wscanf.c          |  6 +-----
 15 files changed, 15 insertions(+), 68 deletions(-)
Gabriel F. T. Gomes - March 26, 2018, 3:35 p.m.
On Wed, 07 Mar 2018, Zack Weinberg wrote:

>Change the callers of __vfscanf_internal and __vfwscanf_internal that
>want C99-compliant behavior to communicate this via the new flags
>argument, rather than setting bits on the FILE object.  This also
>means these functions do not need to do their own locking.

Looks good to me.

Patch

diff --git a/libio/libio.h b/libio/libio.h
index d4eba2df54..30cb7d784f 100644
--- a/libio/libio.h
+++ b/libio/libio.h
@@ -92,7 +92,6 @@  typedef union
 #define _IO_FLAGS2_NOTCANCEL 2
 #define _IO_FLAGS2_FORTIFY 4
 #define _IO_FLAGS2_USER_WBUF 8
-#define _IO_FLAGS2_SCANF_STD 16
 #define _IO_FLAGS2_NOCLOSE 32
 #define _IO_FLAGS2_CLOEXEC 64
 #define _IO_FLAGS2_NEED_LOCK 128
diff --git a/libio/libioP.h b/libio/libioP.h
index a471c90be8..0772fb1431 100644
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -773,7 +773,7 @@  __attribute__ ((__always_inline__))
 _IO_acquire_lock_clear_flags2_fct (FILE **p)
 {
   FILE *fp = *p;
-  fp->_flags2 &= ~(_IO_FLAGS2_FORTIFY | _IO_FLAGS2_SCANF_STD);
+  fp->_flags2 &= ~(_IO_FLAGS2_FORTIFY);
   if ((fp->_flags & _IO_USER_LOCK) == 0)
     _IO_funlockfile (fp);
 }
@@ -787,8 +787,7 @@  _IO_acquire_lock_clear_flags2_fct (FILE **p)
     FILE *_IO_acquire_lock_file = (_fp)
 # define _IO_release_lock(_fp)						      \
     if (_IO_acquire_lock_file != NULL)					      \
-      _IO_acquire_lock_file->_flags2 &= ~(_IO_FLAGS2_FORTIFY		      \
-                                          | _IO_FLAGS2_SCANF_STD);	      \
+      _IO_acquire_lock_file->_flags2 &= ~(_IO_FLAGS2_FORTIFY);		      \
   } while (0)
 #endif
 
diff --git a/stdio-common/isoc99_fscanf.c b/stdio-common/isoc99_fscanf.c
index 4210d11f2b..e788ac47bb 100644
--- a/stdio-common/isoc99_fscanf.c
+++ b/stdio-common/isoc99_fscanf.c
@@ -27,13 +27,9 @@  __isoc99_fscanf (FILE *stream, const char *format, ...)
   va_list arg;
   int done;
 
-  _IO_acquire_lock_clear_flags2 (stream);
-  stream->_flags2 |= _IO_FLAGS2_SCANF_STD;
-
   va_start (arg, format);
-  done = __vfscanf_internal (stream, format, arg, 0);
+  done = __vfscanf_internal (stream, format, arg, SCANF_ISOC99_A);
   va_end (arg);
 
-  _IO_release_lock (stream);
   return done;
 }
diff --git a/stdio-common/isoc99_scanf.c b/stdio-common/isoc99_scanf.c
index 64c873eed9..98b0a19e89 100644
--- a/stdio-common/isoc99_scanf.c
+++ b/stdio-common/isoc99_scanf.c
@@ -19,26 +19,17 @@ 
 #include <stdio.h>
 #include <libioP.h>
 
-
 /* Read formatted input from stdin according to the format string FORMAT.  */
-/* VARARGS1 */
+
 int
 __isoc99_scanf (const char *format, ...)
 {
   va_list arg;
   int done;
 
-#ifdef _IO_MTSAFE_IO
-  _IO_acquire_lock_clear_flags2 (stdin);
-#endif
-  stdin->_flags2 |= _IO_FLAGS2_SCANF_STD;
-
   va_start (arg, format);
-  done = __vfscanf_internal (stdin, format, arg, 0);
+  done = __vfscanf_internal (stdin, format, arg, SCANF_ISOC99_A);
   va_end (arg);
 
-#ifdef _IO_MTSAFE_IO
-  _IO_release_lock (stdin);
-#endif
   return done;
 }
diff --git a/stdio-common/isoc99_sscanf.c b/stdio-common/isoc99_sscanf.c
index 95b94a68b5..c53130e4ff 100644
--- a/stdio-common/isoc99_sscanf.c
+++ b/stdio-common/isoc99_sscanf.c
@@ -27,10 +27,9 @@  __isoc99_sscanf (const char *s, const char *format, ...)
   int done;
   _IO_strfile sf;
   FILE *f = _IO_strfile_read (&sf, s);
-  f->_flags2 |= _IO_FLAGS2_SCANF_STD;
 
   va_start (arg, format);
-  done = __vfscanf_internal (f, format, arg, 0);
+  done = __vfscanf_internal (f, format, arg, SCANF_ISOC99_A);
   va_end (arg);
 
   return done;
diff --git a/stdio-common/isoc99_vfscanf.c b/stdio-common/isoc99_vfscanf.c
index c96ca831ae..0bc2ad911e 100644
--- a/stdio-common/isoc99_vfscanf.c
+++ b/stdio-common/isoc99_vfscanf.c
@@ -23,12 +23,6 @@ 
 int
 __isoc99_vfscanf (FILE *stream, const char *format, va_list args)
 {
-  int done;
-
-  _IO_acquire_lock_clear_flags2 (stream);
-  stream->_flags2 |= _IO_FLAGS2_SCANF_STD;
-  done = __vfscanf_internal (stream, format, args, 0);
-  _IO_release_lock (stream);
-  return done;
+  return __vfscanf_internal (stream, format, args, SCANF_ISOC99_A);
 }
 libc_hidden_def (__isoc99_vfscanf)
diff --git a/stdio-common/isoc99_vscanf.c b/stdio-common/isoc99_vscanf.c
index 72ae72ddee..1a270b0e0c 100644
--- a/stdio-common/isoc99_vscanf.c
+++ b/stdio-common/isoc99_vscanf.c
@@ -23,11 +23,5 @@ 
 int
 __isoc99_vscanf (const char *format, va_list args)
 {
-  int done;
-
-  _IO_acquire_lock_clear_flags2 (stdin);
-  stdin->_flags2 |= _IO_FLAGS2_SCANF_STD;
-  done = __vfscanf_internal (stdin, format, args, 0);
-  _IO_release_lock (stdin);
-  return done;
+  return __vfscanf_internal (stdin, format, args, SCANF_ISOC99_A);
 }
diff --git a/stdio-common/isoc99_vsscanf.c b/stdio-common/isoc99_vsscanf.c
index 02bc0f50e6..dfc394bb51 100644
--- a/stdio-common/isoc99_vsscanf.c
+++ b/stdio-common/isoc99_vsscanf.c
@@ -31,7 +31,6 @@  __isoc99_vsscanf (const char *string, const char *format, va_list args)
 {
   _IO_strfile sf;
   FILE *f = _IO_strfile_read (&sf, string);
-  f->_flags2 |= _IO_FLAGS2_SCANF_STD;
-  return __vfscanf_internal (f, format, args, 0);
+  return __vfscanf_internal (f, format, args, SCANF_ISOC99_A);
 }
 libc_hidden_def (__isoc99_vsscanf)
diff --git a/stdio-common/vfscanf-internal.c b/stdio-common/vfscanf-internal.c
index 93b07ad4bc..9f99d237d2 100644
--- a/stdio-common/vfscanf-internal.c
+++ b/stdio-common/vfscanf-internal.c
@@ -336,8 +336,6 @@  __vfscanf_internal (FILE *s, const char *format, va_list argptr,
   /* Temporarily honor the environmental mode bits.  */
   if (__ldbl_is_dbl)
     mode_flags |= SCANF_LDBL_IS_DBL;
-  if (s->_flags2 & _IO_FLAGS2_SCANF_STD)
-    mode_flags |= SCANF_ISOC99_A;
 
 #ifdef __va_copy
   __va_copy (arg, argptr);
diff --git a/wcsmbs/isoc99_fwscanf.c b/wcsmbs/isoc99_fwscanf.c
index 00b07dd48e..b01826e5ac 100644
--- a/wcsmbs/isoc99_fwscanf.c
+++ b/wcsmbs/isoc99_fwscanf.c
@@ -28,13 +28,9 @@  __isoc99_fwscanf (FILE *stream, const wchar_t *format, ...)
   va_list arg;
   int done;
 
-  _IO_acquire_lock_clear_flags2 (stream);
-  stream->_flags2 |= _IO_FLAGS2_SCANF_STD;
-
   va_start (arg, format);
-  done = __vfwscanf_internal (stream, format, arg, 0);
+  done = __vfwscanf_internal (stream, format, arg, SCANF_ISOC99_A);
   va_end (arg);
 
-  _IO_release_lock (stream);
   return done;
 }
diff --git a/wcsmbs/isoc99_swscanf.c b/wcsmbs/isoc99_swscanf.c
index 40401d0aa1..f90e56d97f 100644
--- a/wcsmbs/isoc99_swscanf.c
+++ b/wcsmbs/isoc99_swscanf.c
@@ -28,10 +28,9 @@  __isoc99_swscanf (const wchar_t *s, const wchar_t *format, ...)
   _IO_strfile sf;
   struct _IO_wide_data wd;
   FILE *f = _IO_strfile_readw (&sf, &wd, s);
-  f->_flags2 |= _IO_FLAGS2_SCANF_STD;
 
   va_start (arg, format);
-  done = __vfwscanf_internal (f, format, arg, 0);
+  done = __vfwscanf_internal (f, format, arg, SCANF_ISOC99_A);
   va_end (arg);
 
   return done;
diff --git a/wcsmbs/isoc99_vfwscanf.c b/wcsmbs/isoc99_vfwscanf.c
index f70c6b596d..f9d0a384f5 100644
--- a/wcsmbs/isoc99_vfwscanf.c
+++ b/wcsmbs/isoc99_vfwscanf.c
@@ -24,12 +24,6 @@ 
 int
 __isoc99_vfwscanf (FILE *stream, const wchar_t *format, va_list args)
 {
-  int done;
-
-  _IO_acquire_lock_clear_flags2 (stream);
-  stream->_flags2 |= _IO_FLAGS2_SCANF_STD;
-  done = __vfwscanf_internal (stream, format, args, 0);
-  _IO_release_lock (stream);
-  return done;
+  return __vfwscanf_internal (stream, format, args, SCANF_ISOC99_A);
 }
 libc_hidden_def (__isoc99_vfwscanf)
diff --git a/wcsmbs/isoc99_vswscanf.c b/wcsmbs/isoc99_vswscanf.c
index b91eb651a3..0d8ef7611a 100644
--- a/wcsmbs/isoc99_vswscanf.c
+++ b/wcsmbs/isoc99_vswscanf.c
@@ -33,7 +33,6 @@  __isoc99_vswscanf (const wchar_t *string, const wchar_t *format, va_list args)
   _IO_strfile sf;
   struct _IO_wide_data wd;
   FILE *f = _IO_strfile_readw (&sf, &wd, string);
-  f->_flags2 |= _IO_FLAGS2_SCANF_STD;
-  return __vfwscanf_internal (f, format, args, 0);
+  return __vfwscanf_internal (f, format, args, SCANF_ISOC99_A);
 }
 libc_hidden_def (__isoc99_vswscanf)
diff --git a/wcsmbs/isoc99_vwscanf.c b/wcsmbs/isoc99_vwscanf.c
index eb22c8acae..5e4f44d794 100644
--- a/wcsmbs/isoc99_vwscanf.c
+++ b/wcsmbs/isoc99_vwscanf.c
@@ -24,11 +24,5 @@ 
 int
 __isoc99_vwscanf (const wchar_t *format, va_list args)
 {
-  int done;
-
-  _IO_acquire_lock_clear_flags2 (stdin);
-  stdin->_flags2 |= _IO_FLAGS2_SCANF_STD;
-  done = __vfwscanf_internal (stdin, format, args, 0);
-  _IO_release_lock (stdin);
-  return done;
+  return __vfwscanf_internal (stdin, format, args, SCANF_ISOC99_A);
 }
diff --git a/wcsmbs/isoc99_wscanf.c b/wcsmbs/isoc99_wscanf.c
index 59f80d78fb..a0f24e1f49 100644
--- a/wcsmbs/isoc99_wscanf.c
+++ b/wcsmbs/isoc99_wscanf.c
@@ -29,13 +29,9 @@  __isoc99_wscanf (const wchar_t *format, ...)
   va_list arg;
   int done;
 
-  _IO_acquire_lock_clear_flags2 (stdin);
-  stdin->_flags2 |= _IO_FLAGS2_SCANF_STD;
-
   va_start (arg, format);
-  done = __vfwscanf_internal (stdin, format, arg, 0);
+  done = __vfwscanf_internal (stdin, format, arg, SCANF_ISOC99_A);
   va_end (arg);
 
-  _IO_release_lock (stdin);
   return done;
 }