libroot/glibc: Add missing stdio_ext methods needed by gnulib.

Otherwise it needs to use libio internals to implement these,
which we don't want. musl also exports all these methods for
the same reason.

Implementations taken from glibc 2.15, current gnulib (5077f67), and
in a few cases tweaked for better Haiku support.

Should fix #19479.

headers/posix/stdio_ext.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2008-2012 Haiku, Inc. All Rights Reserved.
+ * Copyright 2008-2025, Haiku, Inc. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _STDIO_EXT_H_
@@ -16,19 +16,21 @@ extern "C" {
 #define FSETLOCKING_INTERNAL	1
 #define FSETLOCKING_BYCALLER	2
 
-/* The following stdio extensions are not implemented yet */
-/* extern size_t	__fufsize(FILE* stream); */
-extern int		__freading(FILE* stream);
-/* extern int		__fwriting(FILE* stream); */
-/* extern int		__freadable(FILE* stream); */
-/* extern int		__fwritable(FILE* stream); */
-/* extern int		__flbf(FILE* stream); */
-extern void		__fpurge(FILE* stream);
-/* extern size_t	__fpending(FILE* stream); */
-
 extern void		_flushlbf(void);
 extern int		__fsetlocking(FILE* stream, int type);
 
+extern int		__freading(FILE* stream);
+extern int		__fwriting(FILE* stream);
+extern int		__freadable(FILE* stream);
+extern int		__fwritable(FILE* stream);
+extern size_t	__freadahead(FILE* stream);
+extern const char* __freadptr(FILE* stream, size_t* size);
+extern void		__freadptrinc(FILE* stream, size_t inc);
+extern int		__flbf(FILE* stream);
+extern size_t	__fbufsize(FILE* stream);
+extern size_t	__fpending(FILE* stream);
+extern void		__fpurge(FILE* stream);
+
 #ifdef __cplusplus
 }
 #endif

src/system/libroot/posix/glibc/include/stdio_ext.h

@@ -1,11 +0,0 @@
-#ifndef	_STDIO_EXT_H
-
-# include <stdio-common/stdio_ext.h>
-
-extern int __fsetlocking_internal (FILE *__fp, int __type) attribute_hidden;
-
-#ifndef NOT_IN_libc
-# define __fsetlocking(fp, type) INTUSE(__fsetlocking) (fp, type)
-#endif
-
-#endif

src/system/libroot/posix/glibc/libio/Jamfile

@@ -25,9 +25,19 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 		UsePrivateHeaders libroot ;
 
 		MergeObject <$(architecture)>posix_gnu_libio.o :
+			__fbufsize.c
+			__flbf.c
+			__fpending.c
 			__fpurge.c
+			__freadable.c
+			__freadahead.c
 			__freading.c
+			__freadptr.c
+			__freadptrinc.c
+			__fseterr.c
 			__fsetlocking.c
+			__fwritable.c
+			__fwriting.c
 			clearerr.c
 			clearerr_u.c
 			fcloseall.c

src/system/libroot/posix/glibc/libio/__fbufsize.c

@@ -0,0 +1,33 @@
+/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stdio_ext.h>
+
+size_t
+__fbufsize (FILE *fp)
+{
+#ifdef __HAIKU__
+  if (fp->_flags & _IO_UNBUFFERED)
+    return 0;
+#endif
+
+  if (fp->_mode > 0)
+    return fp->_wide_data->_IO_buf_end - fp->_wide_data->_IO_buf_base;
+  else
+    return fp->_IO_buf_end - fp->_IO_buf_base;
+}

src/system/libroot/posix/glibc/libio/__flbf.c

@@ -0,0 +1,25 @@
+/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stdio_ext.h>
+
+int
+__flbf (FILE *fp)
+{
+  return fp->_flags & _IO_LINE_BUF;
+}

src/system/libroot/posix/glibc/libio/__fpending.c

@@ -0,0 +1,28 @@
+/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stdio_ext.h>
+
+size_t
+__fpending (FILE *fp)
+{
+  if (fp->_mode > 0)
+    return fp->_wide_data->_IO_write_ptr - fp->_wide_data->_IO_write_base;
+  else
+    return fp->_IO_write_ptr - fp->_IO_write_base;
+}

src/system/libroot/posix/glibc/libio/__freadable.c

@@ -0,0 +1,25 @@
+/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stdio_ext.h>
+
+int
+__freadable (FILE *fp)
+{
+  return (fp->_flags & _IO_NO_READS) == 0;
+}

src/system/libroot/posix/glibc/libio/__freadahead.c

@@ -0,0 +1,28 @@
+/* Retrieve information about a FILE stream.
+   Copyright (C) 2007-2025 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <stdio_ext.h>
+#include "libioP.h"
+
+size_t
+__freadahead (FILE *fp)
+{
+  if (fp->_IO_write_ptr > fp->_IO_write_base)
+    return 0;
+  return (fp->_IO_read_end - fp->_IO_read_ptr)
+         + (fp->_flags & _IO_IN_BACKUP ? fp->_IO_save_end - fp->_IO_save_base :
+            0);
+}

src/system/libroot/posix/glibc/libio/__freadptr.c

@@ -0,0 +1,31 @@
+/* Retrieve information about a FILE stream.
+   Copyright (C) 2007-2025 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <stdio_ext.h>
+#include "libioP.h"
+
+const char *
+__freadptr (FILE *fp, size_t *sizep)
+{
+  size_t size;
+  if (fp->_IO_write_ptr > fp->_IO_write_base)
+    return NULL;
+  size = fp->_IO_read_end - fp->_IO_read_ptr;
+  if (size == 0)
+    return NULL;
+  *sizep = size;
+  return (const char *) fp->_IO_read_ptr;
+}

src/system/libroot/posix/glibc/libio/__freadptrinc.c

@@ -0,0 +1,24 @@
+/* Skipping input from a FILE stream.
+   Copyright (C) 2007-2025 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <stdio_ext.h>
+#include "libioP.h"
+
+void
+__freadptrinc (FILE *fp, size_t increment)
+{
+  fp->_IO_read_ptr += increment;
+}

src/system/libroot/posix/glibc/libio/__fseterr.c

@@ -0,0 +1,24 @@
+/* Set the error indicator of a stream.
+   Copyright (C) 2007-2025 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <stdio_ext.h>
+#include "libioP.h"
+
+void
+__fseterr (FILE *fp)
+{
+  fp->_flags |= _IO_ERR_SEEN;
+}

src/system/libroot/posix/glibc/libio/__fwritable.c

@@ -0,0 +1,25 @@
+/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stdio_ext.h>
+
+int
+__fwritable (FILE *fp)
+{
+  return (fp->_flags & _IO_NO_WRITES) == 0;
+}

src/system/libroot/posix/glibc/libio/__fwriting.c

@@ -0,0 +1,25 @@
+/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stdio_ext.h>
+
+int
+__fwriting (FILE *fp)
+{
+  return fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING);
+}

src/system/libroot/posix/glibc/stdio-common/stdio_ext.h

@@ -1,87 +0,0 @@
-/* Functions to access FILE structure internals.
-   Copyright (C) 2000, 2001 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
-
-/* This header contains the same definitions as the header of the same name
-   on Sun's Solaris OS.  */
-
-#ifndef _STDIO_EXT_H
-#define _STDIO_EXT_H	1
-
-#include <stdio.h>
-
-enum
-{
-  /* Query current state of the locking status.  */
-  FSETLOCKING_QUERY = 0,
-#define FSETLOCKING_QUERY	FSETLOCKING_QUERY
-  /* The library protects all uses of the stream functions, except for
-     uses of the *_unlocked functions, by calls equivalent to flockfile().  */
-  FSETLOCKING_INTERNAL,
-#define FSETLOCKING_INTERNAL	FSETLOCKING_INTERNAL
-  /* The user will take care of locking.  */
-  FSETLOCKING_BYCALLER
-#define FSETLOCKING_BYCALLER	FSETLOCKING_BYCALLER
-};
-
-
-__BEGIN_DECLS
-
-/* Return the size of the buffer of FP in bytes currently in use by
-   the given stream.  */
-extern size_t __fbufsize (FILE *__fp);
-
-
-/* Return non-zero value iff the stream FP is opened readonly, or if the
-   last operation on the stream was a read operation.  */
-extern int __freading (FILE *__fp);
-
-/* Return non-zero value iff the stream FP is opened write-only or
-   append-only, or if the last operation on the stream was a write
-   operation.  */
-extern int __fwriting (FILE *__fp);
-
-
-/* Return non-zero value iff stream FP is not opened write-only or
-   append-only.  */
-extern int __freadable (FILE *__fp);
-
-/* Return non-zero value iff stream FP is not opened read-only.  */
-extern int __fwritable (FILE *__fp);
-
-
-/* Return non-zero value iff the stream FP is line-buffered.  */
-extern int __flbf (FILE *__fp);
-
-
-/* Discard all pending buffered I/O on the stream FP.  */
-extern void __fpurge (FILE *__fp);
-
-/* Return amount of output in bytes pending on a stream FP.  */
-extern size_t __fpending (FILE *__fp);
-
-/* Flush all line-buffered files.  */
-extern void _flushlbf (void);
-
-
-/* Set locking status of stream FP to TYPE.  */
-extern int __fsetlocking (FILE *__fp, int __type);
-
-__END_DECLS
-
-#endif	/* stdio_ext.h */