mirror of
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Post-cleanup 2: minimize _G_config.h.
Nearly everything in _G_config.h is either junk or more appropriately defined elsewhere: * _G_fpos_t, _G_fpos64_t, and _G_BUFSIZ are already completely unused. * All remaining uses of _G_va_list have been changed to __gnuc_va_list. * The definition of _G_HAVE_ST_BLKSIZE/_IO_HAVE_ST_BLKSIZE has been inlined into its sole use. * The complete definition of _G_iconv_t has been moved to libio.h and renamed _IO_iconv_t (all actual users used that name). * _G_IO_IO_FILE_VERSION is vestigial; some code cares whether _IO_stdin_used exists, but nothing looks at its value. I've preserved the value as a hardwired constant in csu/init.c. This means csu/init.c no longer needs to include anything. * Many of the headers included by _G_config.h were already being included directly by either either libio.h or stdio.h; the remaining ones were moved to libio.h. * _G_HAVE_MREMAP is still relevant, because mremap genuinely is a Linux extension; it's not in POSIX and as far as I can tell it's not available on the Hurd either. I also preserved _G_HAVE_MMAP, since it's conceivable someone would want to port glibc to a MMU-less, mmap-less environment in the future. Both are now always defined to 1/0 as is the current convention, instead of the older 1/undef convention. These are the only symbols still defined in _G_config.h. * The actual inclusion of _G_config.h moves from libio.h to libioP.h, as this is where a potential override of _G_HAVE_MMAP happens. * The #ifdef logic in libioP.h controlling _IO_JUMPS_OFFSET has been simplified. After this patch, the only surviving _G_ symbols are the struct tag names _G_fpos_t and _G_fpos64_t, which are preserved for the sake of C++ mangled names in applications, and _G_HAVE_MMAP and _G_HAVE_MREMAP, which do not seem worth renaming. Installed stripped libraries are unchanged by this patch. * bits/_G_config.h: Move back to sysdeps/generic/_G_config.h. Delete all contents except for definitions of _G_HAVE_MMAP and _G_HAVE_MREMAP. Add commentary explaining those two symbols. * sysdeps/unix/sysv/linux/bits/_G_config.h: Move back to sysdeps/unix/sysv/linux/_G_config.h. Make same content change as above. * libio/libio.h: Don't include bits/_G_config.h here. Include stddef.h with __need_wchar_t defined. Include bits/types/__mbstate_t.h, bits/types/wint_t.h, and gconv.h. Define _IO_iconv_t here, directly. Don't define _IO_HAVE_ST_BLKSIZE. * libio/libioP.h: Include _G_config.h here. Move include of shlib-compat.h up with rest of includes. Simplify conditionals controlling definition of _IO_JUMPS_OFFSET. * csu/init.c: Remove always-true #if around entire file. Don't include stdio.h. Set _IO_stdin_used to hardwired constant 0x20001, and update commentary. * include/stdio.h, sysdeps/ieee754/ldbl-opt/nldbl-compat.h: Replace all uses of _G_va_list with __gnuc_va_list. * libio/filedoalloc.c: Use #if defined _STATBUF_ST_BLKSIZE instead of #if _IO_HAVE_ST_BLKSIZE. * libio/fileops.c: Test _G_HAVE_MREMAP with #if, not #ifdef. * libio/iofdopen.c, libio/iofopen.c: Test _G_HAVE_MMAP with #if, not #ifdef.
This commit is contained in:
parent
6c6c962a20
commit
63fb8f9aa9
27
ChangeLog
27
ChangeLog
@ -1,5 +1,32 @@
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2018-02-07 Zack Weinberg <zackw@panix.com>
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* bits/_G_config.h: Move back to sysdeps/generic/_G_config.h.
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Delete all contents except for definitions of _G_HAVE_MMAP and
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_G_HAVE_MREMAP. Add commentary explaining those two symbols.
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* sysdeps/unix/sysv/linux/bits/_G_config.h: Move back to
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sysdeps/unix/sysv/linux/_G_config.h. Make same content
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change as above.
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* libio/libio.h: Don't include bits/_G_config.h here.
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Include stddef.h with __need_wchar_t defined. Include
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bits/types/__mbstate_t.h, bits/types/wint_t.h, and gconv.h.
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Define _IO_iconv_t here, directly.
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Don't define _IO_HAVE_ST_BLKSIZE.
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* libio/libioP.h: Include _G_config.h here. Move include of
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shlib-compat.h up with rest of includes. Simplify conditionals
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controlling definition of _IO_JUMPS_OFFSET.
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* csu/init.c: Remove always-true #if around entire file.
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Don't include stdio.h. Set _IO_stdin_used to hardwired
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constant 0x20001, and update commentary.
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* include/stdio.h, sysdeps/ieee754/ldbl-opt/nldbl-compat.h:
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Replace all uses of _G_va_list with __gnuc_va_list.
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* libio/filedoalloc.c: Use #if defined _STATBUF_ST_BLKSIZE
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instead of #if _IO_HAVE_ST_BLKSIZE.
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* libio/fileops.c: Test _G_HAVE_MREMAP with #if, not #ifdef.
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* libio/iofdopen.c, libio/iofopen.c: Test _G_HAVE_MMAP with #if,
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not #ifdef.
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* libio/bits/libio.h: Move back to libio/libio.h and adjust
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multiple-include guard to match.
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Merge contents of libio/bits/libio-ldbl.h and include/libio.h
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@ -1,54 +0,0 @@
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/* This file is needed by libio to define various configuration parameters.
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These are always the same in the GNU C library. */
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#ifndef _BITS_G_CONFIG_H
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#define _BITS_G_CONFIG_H 1
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/* Define types for libio in terms of the standard internal type names. */
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#include <bits/types.h>
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#define __need_size_t
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#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
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# define __need_wchar_t
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#endif
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#define __need_NULL
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#include <stddef.h>
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#include <bits/types/__mbstate_t.h>
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#include <bits/types/__fpos_t.h>
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#include <bits/types/__fpos64_t.h>
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#define _G_fpos_t __fpos_t
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#define _G_fpos64_t __fpos64_t
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#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
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# include <bits/types/wint_t.h>
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#endif
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#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
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# include <gconv.h>
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typedef union
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{
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struct __gconv_info __cd;
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struct
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{
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struct __gconv_info __cd;
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struct __gconv_step_data __data;
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} __combined;
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} _G_iconv_t;
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#endif
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/* These library features are always available in the GNU C library. */
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#define _G_va_list __gnuc_va_list
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#define _G_HAVE_MMAP 1
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#define _G_IO_IO_FILE_VERSION 0x20001
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/* This is defined by <bits/stat.h> if `st_blksize' exists. */
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#define _G_HAVE_ST_BLKSIZE defined (_STATBUF_ST_BLKSIZE)
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#define _G_BUFSIZ 8192
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#endif /* bits/_G_config.h */
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13
csu/init.c
13
csu/init.c
@ -16,11 +16,8 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#if defined __GNUC__ && __GNUC__ >= 2
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#include <stdio.h>
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/* This records which stdio is linked against in the application. */
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const int _IO_stdin_used = _G_IO_IO_FILE_VERSION;
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#endif
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/* Vestigial libio version number. Some code in libio checks whether
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this symbol exists in the executable, but nothing looks at its
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value anymore; the value it was historically set to has been
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preserved out of an abundance of caution. */
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const int _IO_stdin_used = 0x20001;
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@ -15,44 +15,44 @@ extern int __snprintf (char *__restrict __s, size_t __maxlen,
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__attribute__ ((__format__ (__printf__, 3, 4)));
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libc_hidden_proto (__snprintf)
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extern int __vsnprintf (char *__restrict __s, size_t __maxlen,
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const char *__restrict __format, _G_va_list __arg)
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const char *__restrict __format, __gnuc_va_list __arg)
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__attribute__ ((__format__ (__printf__, 3, 0)));
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extern int __vfscanf (FILE *__restrict __s,
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const char *__restrict __format,
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_G_va_list __arg)
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__gnuc_va_list __arg)
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__attribute__ ((__format__ (__scanf__, 2, 0)));
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libc_hidden_proto (__vfscanf)
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extern int __vscanf (const char *__restrict __format,
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_G_va_list __arg)
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__gnuc_va_list __arg)
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__attribute__ ((__format__ (__scanf__, 1, 0)));
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extern _IO_ssize_t __getline (char **__lineptr, size_t *__n,
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FILE *__stream) attribute_hidden;
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extern int __vsscanf (const char *__restrict __s,
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const char *__restrict __format,
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_G_va_list __arg)
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__gnuc_va_list __arg)
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__attribute__ ((__format__ (__scanf__, 2, 0)));
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extern int __sprintf_chk (char *, int, size_t, const char *, ...) __THROW;
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extern int __snprintf_chk (char *, size_t, int, size_t, const char *, ...)
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__THROW;
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extern int __vsprintf_chk (char *, int, size_t, const char *,
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_G_va_list) __THROW;
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__gnuc_va_list) __THROW;
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extern int __vsnprintf_chk (char *, size_t, int, size_t, const char *,
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_G_va_list) __THROW;
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__gnuc_va_list) __THROW;
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extern int __printf_chk (int, const char *, ...);
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extern int __fprintf_chk (FILE *, int, const char *, ...);
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extern int __vprintf_chk (int, const char *, _G_va_list);
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extern int __vfprintf_chk (FILE *, int, const char *, _G_va_list);
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extern int __vprintf_chk (int, const char *, __gnuc_va_list);
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extern int __vfprintf_chk (FILE *, int, const char *, __gnuc_va_list);
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extern char *__fgets_unlocked_chk (char *buf, size_t size, int n, FILE *fp);
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extern char *__fgets_chk (char *buf, size_t size, int n, FILE *fp);
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extern int __asprintf_chk (char **, int, const char *, ...) __THROW;
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extern int __vasprintf_chk (char **, int, const char *, _G_va_list) __THROW;
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extern int __vasprintf_chk (char **, int, const char *, __gnuc_va_list) __THROW;
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extern int __dprintf_chk (int, int, const char *, ...);
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extern int __vdprintf_chk (int, int, const char *, _G_va_list);
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extern int __vdprintf_chk (int, int, const char *, __gnuc_va_list);
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extern int __obstack_printf_chk (struct obstack *, int, const char *, ...)
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__THROW;
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extern int __obstack_vprintf_chk (struct obstack *, int, const char *,
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_G_va_list) __THROW;
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__gnuc_va_list) __THROW;
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extern int __isoc99_fscanf (FILE *__restrict __stream,
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const char *__restrict __format, ...) __wur;
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@ -61,12 +61,12 @@ extern int __isoc99_sscanf (const char *__restrict __s,
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const char *__restrict __format, ...) __THROW;
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extern int __isoc99_vfscanf (FILE *__restrict __s,
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const char *__restrict __format,
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_G_va_list __arg) __wur;
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__gnuc_va_list __arg) __wur;
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extern int __isoc99_vscanf (const char *__restrict __format,
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_G_va_list __arg) __wur;
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__gnuc_va_list __arg) __wur;
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extern int __isoc99_vsscanf (const char *__restrict __s,
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const char *__restrict __format,
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_G_va_list __arg) __THROW;
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__gnuc_va_list __arg) __THROW;
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libc_hidden_proto (__isoc99_vsscanf)
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libc_hidden_proto (__isoc99_vfscanf)
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@ -93,7 +93,7 @@ _IO_file_doallocate (_IO_FILE *fp)
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local_isatty (fp->_fileno))
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fp->_flags |= _IO_LINE_BUF;
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}
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#if _IO_HAVE_ST_BLKSIZE
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#if defined _STATBUF_ST_BLKSIZE
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if (st.st_blksize > 0 && st.st_blksize < _IO_BUFSIZ)
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size = st.st_blksize;
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#endif
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@ -582,7 +582,7 @@ mmap_remap_check (_IO_FILE *fp)
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{
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/* The file added some pages. We need to remap it. */
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void *p;
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#ifdef _G_HAVE_MREMAP
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#if _G_HAVE_MREMAP
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p = __mremap (fp->_IO_buf_base, ROUNDED (fp->_IO_buf_end
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- fp->_IO_buf_base),
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ROUNDED (st.st_size), MREMAP_MAYMOVE);
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@ -126,13 +126,13 @@ _IO_new_fdopen (int fd, const char *mode)
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new_f->fp.file._lock = &new_f->lock;
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#endif
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_IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd,
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#ifdef _G_HAVE_MMAP
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#if _G_HAVE_MMAP
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(use_mmap && (read_write & _IO_NO_WRITES))
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? &_IO_wfile_jumps_maybe_mmap :
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#endif
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&_IO_wfile_jumps);
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_IO_JUMPS (&new_f->fp) =
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#ifdef _G_HAVE_MMAP
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#if _G_HAVE_MMAP
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(use_mmap && (read_write & _IO_NO_WRITES)) ? &_IO_file_jumps_maybe_mmap :
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#endif
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&_IO_file_jumps;
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@ -33,7 +33,7 @@
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_IO_FILE *
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__fopen_maybe_mmap (_IO_FILE *fp)
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{
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#ifdef _G_HAVE_MMAP
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#if _G_HAVE_MMAP
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if ((fp->_flags2 & _IO_FLAGS2_MMAP) && (fp->_flags & _IO_NO_WRITES))
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{
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/* Since this is read-only, we might be able to mmap the contents
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@ -41,8 +41,24 @@
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# error "Someone forgot to include stdio-lock.h"
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#endif
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#include <bits/_G_config.h>
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/* ALL of these should be defined in _G_config.h */
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#define __need_wchar_t
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#include <stddef.h>
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#include <bits/types/__mbstate_t.h>
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#include <bits/types/wint_t.h>
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#include <gconv.h>
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typedef union
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{
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struct __gconv_info __cd;
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struct
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{
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struct __gconv_info __cd;
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struct __gconv_step_data __data;
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} __combined;
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} _IO_iconv_t;
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/* Map the names used in libio to the names used in libc generally. */
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#define _IO_fpos_t __fpos_t
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#define _IO_fpos64_t __fpos64_t
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#define _IO_size_t size_t
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@ -51,8 +67,6 @@
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#define _IO_off64_t __off64_t
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#define _IO_pid_t __pid_t
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#define _IO_uid_t __uid_t
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#define _IO_iconv_t _G_iconv_t
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#define _IO_HAVE_ST_BLKSIZE _G_HAVE_ST_BLKSIZE
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#define _IO_BUFSIZ BUFSIZ
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#define _IO_wint_t wint_t
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#define _IO_va_list __gnuc_va_list
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@ -46,6 +46,12 @@
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#include <libio/libio.h>
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#include "iolibio.h"
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#include <shlib-compat.h>
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/* For historical reasons this is the name of the sysdeps header that
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adjusts the libio configuration. */
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#include <_G_config.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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@ -75,16 +81,10 @@ extern "C" {
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* object being acted on (i.e. the 'this' parameter).
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*/
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#include <shlib-compat.h>
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#if !SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
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/* Setting this macro disables the use of the _vtable_offset bias in
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_IO_JUMPS_FUNCS, below. That is only needed if we want to
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support old binaries (see oldfileops.c). */
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# define _G_IO_NO_BACKWARD_COMPAT 1
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#endif
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#if (!defined _IO_USE_OLD_IO_FILE \
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&& (!defined _G_IO_NO_BACKWARD_COMPAT || _G_IO_NO_BACKWARD_COMPAT == 0))
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/* Setting this macro to 1 enables the use of the _vtable_offset bias
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in _IO_JUMPS_FUNCS, below. This is only needed for new-format
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_IO_FILE in libc that must support old binaries (see oldfileops.c). */
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) && !defined _IO_USE_OLD_IO_FILE
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# define _IO_JUMPS_OFFSET 1
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#else
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# define _IO_JUMPS_OFFSET 0
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15
sysdeps/generic/_G_config.h
Normal file
15
sysdeps/generic/_G_config.h
Normal file
@ -0,0 +1,15 @@
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/* Configuration parameters for stdio - generic version. */
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#ifndef __G_CONFIG_H
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#define __G_CONFIG_H 1
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/* Define to 1 if the operating system supports mmap, 0 otherwise.
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This function is required by POSIX but might still be unavailable,
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for instance when the hardware lacks support for virtual memory. */
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#define _G_HAVE_MMAP 1
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/* Define to 1 if the operating system supports mremap, 0 otherwise.
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This function is currently a Linux-specific extension. */
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#define _G_HAVE_MREMAP 0
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#endif /* _G_config.h */
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@ -82,22 +82,23 @@ extern ssize_t __nldbl___vstrfmon (char *, size_t, const char *, va_list)
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/* These don't use __typeof because they were not declared by the headers,
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since we don't compile with _FORTIFY_SOURCE. */
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extern int __nldbl___vfprintf_chk (FILE *__restrict, int,
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const char *__restrict, _G_va_list);
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const char *__restrict, __gnuc_va_list);
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extern int __nldbl___vfwprintf_chk (FILE *__restrict, int,
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const wchar_t *__restrict, __gnuc_va_list);
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extern int __nldbl___vsprintf_chk (char *__restrict, int, size_t,
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const char *__restrict, _G_va_list) __THROW;
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const char *__restrict, __gnuc_va_list)
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__THROW;
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extern int __nldbl___vsnprintf_chk (char *__restrict, size_t, int, size_t,
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const char *__restrict, _G_va_list)
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const char *__restrict, __gnuc_va_list)
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__THROW;
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extern int __nldbl___vswprintf_chk (wchar_t *__restrict, size_t, int, size_t,
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const wchar_t *__restrict, __gnuc_va_list)
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__THROW;
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extern int __nldbl___vasprintf_chk (char **, int, const char *, _G_va_list)
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extern int __nldbl___vasprintf_chk (char **, int, const char *, __gnuc_va_list)
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__THROW;
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extern int __nldbl___vdprintf_chk (int, int, const char *, _G_va_list);
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extern int __nldbl___vdprintf_chk (int, int, const char *, __gnuc_va_list);
|
||||
extern int __nldbl___obstack_vprintf_chk (struct obstack *, int, const char *,
|
||||
_G_va_list) __THROW;
|
||||
__gnuc_va_list) __THROW;
|
||||
extern void __nldbl___vsyslog_chk (int, int, const char *, va_list);
|
||||
|
||||
|
||||
|
15
sysdeps/unix/sysv/linux/_G_config.h
Normal file
15
sysdeps/unix/sysv/linux/_G_config.h
Normal file
@ -0,0 +1,15 @@
|
||||
/* Configuration parameters for stdio - Linux version. */
|
||||
|
||||
#ifndef __G_CONFIG_H
|
||||
#define __G_CONFIG_H 1
|
||||
|
||||
/* Define to 1 if the operating system supports mmap, 0 otherwise.
|
||||
This function is required by POSIX but might still be unavailable,
|
||||
for instance when the hardware lacks support for virtual memory. */
|
||||
#define _G_HAVE_MMAP 1
|
||||
|
||||
/* Define to 1 if the operating system supports mremap, 0 otherwise.
|
||||
This function is currently a Linux-specific extension. */
|
||||
#define _G_HAVE_MREMAP 1
|
||||
|
||||
#endif /* bits/_G_config.h */
|
@ -1,55 +0,0 @@
|
||||
/* This file is needed by libio to define various configuration parameters.
|
||||
These are always the same in the GNU C library. */
|
||||
|
||||
#ifndef _BITS_G_CONFIG_H
|
||||
#define _BITS_G_CONFIG_H 1
|
||||
|
||||
/* Define types for libio in terms of the standard internal type names. */
|
||||
|
||||
#include <bits/types.h>
|
||||
#define __need_size_t
|
||||
#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
|
||||
# define __need_wchar_t
|
||||
#endif
|
||||
#define __need_NULL
|
||||
#include <stddef.h>
|
||||
|
||||
#include <bits/types/__mbstate_t.h>
|
||||
#include <bits/types/__fpos_t.h>
|
||||
#include <bits/types/__fpos64_t.h>
|
||||
|
||||
#define _G_fpos_t __fpos_t
|
||||
#define _G_fpos64_t __fpos64_t
|
||||
|
||||
#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
|
||||
# include <bits/types/wint_t.h>
|
||||
#endif
|
||||
|
||||
#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
|
||||
# include <gconv.h>
|
||||
typedef union
|
||||
{
|
||||
struct __gconv_info __cd;
|
||||
struct
|
||||
{
|
||||
struct __gconv_info __cd;
|
||||
struct __gconv_step_data __data;
|
||||
} __combined;
|
||||
} _G_iconv_t;
|
||||
#endif
|
||||
|
||||
|
||||
/* These library features are always available in the GNU C library. */
|
||||
#define _G_va_list __gnuc_va_list
|
||||
|
||||
#define _G_HAVE_MMAP 1
|
||||
#define _G_HAVE_MREMAP 1
|
||||
|
||||
#define _G_IO_IO_FILE_VERSION 0x20001
|
||||
|
||||
/* This is defined by <bits/stat.h> if `st_blksize' exists. */
|
||||
#define _G_HAVE_ST_BLKSIZE defined (_STATBUF_ST_BLKSIZE)
|
||||
|
||||
#define _G_BUFSIZ 8192
|
||||
|
||||
#endif /* bits/_G_config.h */
|
Loading…
Reference in New Issue
Block a user