set default newlib dir's structure

git-svn-id: svn://kolibrios.org@4874 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/libc/stdio/setvbuf.c

@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/*
+FUNCTION
+<<setvbuf>>---specify file or stream buffering
+
+INDEX
+	setvbuf
+
+ANSI_SYNOPSIS
+	#include <stdio.h>
+	int setvbuf(FILE *<[fp]>, char *<[buf]>,
+	            int <[mode]>, size_t <[size]>);
+
+TRAD_SYNOPSIS
+	#include <stdio.h>
+	int setvbuf(<[fp]>, <[buf]>, <[mode]>, <[size]>)
+	FILE *<[fp]>;
+	char *<[buf]>;
+	int <[mode]>;
+	size_t <[size]>;
+
+DESCRIPTION
+Use <<setvbuf>> to specify what kind of buffering you want for the
+file or stream identified by <[fp]>, by using one of the following
+values (from <<stdio.h>>) as the <[mode]> argument:
+
+o+
+o _IONBF
+Do not use a buffer: send output directly to the host system for the
+file or stream identified by <[fp]>.
+
+o _IOFBF
+Use full output buffering: output will be passed on to the host system
+only when the buffer is full, or when an input operation intervenes.
+
+o _IOLBF
+Use line buffering: pass on output to the host system at every
+newline, as well as when the buffer is full, or when an input
+operation intervenes.
+o-
+
+Use the <[size]> argument to specify how large a buffer you wish.  You
+can supply the buffer itself, if you wish, by passing a pointer to a
+suitable area of memory as <[buf]>.  Otherwise, you may pass <<NULL>>
+as the <[buf]> argument, and <<setvbuf>> will allocate the buffer.
+
+WARNINGS
+You may only use <<setvbuf>> before performing any file operation other
+than opening the file.
+
+If you supply a non-null <[buf]>, you must ensure that the associated
+storage continues to be available until you close the stream
+identified by <[fp]>.
+
+RETURNS
+A <<0>> result indicates success, <<EOF>> failure (invalid <[mode]> or
+<[size]> can cause failure).
+
+PORTABILITY
+Both ANSI C and the System V Interface Definition (Issue 2) require
+<<setvbuf>>. However, they differ on the meaning of a <<NULL>> buffer
+pointer: the SVID issue 2 specification says that a <<NULL>> buffer
+pointer requests unbuffered output.  For maximum portability, avoid
+<<NULL>> buffer pointers.
+
+Both specifications describe the result on failure only as a
+nonzero value.
+
+Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
+<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
+*/
+
+#include <_ansi.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "local.h"
+
+/*
+ * Set one of the three kinds of buffering, optionally including a buffer.
+ */
+
+int
+_DEFUN(setvbuf, (fp, buf, mode, size),
+       register FILE * fp _AND
+       char *buf          _AND
+       register int mode  _AND
+       register size_t size)
+{
+  int ret = 0;
+
+  CHECK_INIT (_REENT, fp);
+
+  _flockfile (fp);
+
+  /*
+   * Verify arguments.  The `int' limit on `size' is due to this
+   * particular implementation.
+   */
+
+  if ((mode != _IOFBF && mode != _IOLBF && mode != _IONBF) || (int)(_POINTER_INT) size < 0)
+    {
+      _funlockfile (fp);
+      return (EOF);
+    }
+
+  /*
+   * Write current buffer, if any; drop read count, if any.
+   * Make sure putc() will not think fp is line buffered.
+   * Free old buffer if it was from malloc().  Clear line and
+   * non buffer flags, and clear malloc flag.
+   */
+
+  _fflush_r (_REENT, fp);
+  fp->_r = 0;
+  fp->_lbfsize = 0;
+  if (fp->_flags & __SMBF)
+    _free_r (_REENT, (_PTR) fp->_bf._base);
+  fp->_flags &= ~(__SLBF | __SNBF | __SMBF);
+
+  if (mode == _IONBF)
+    goto nbf;
+
+  /*
+   * Allocate buffer if needed. */
+  if (buf == NULL)
+    {
+      /* we need this here because malloc() may return a pointer
+	 even if size == 0 */
+      if (!size) size = BUFSIZ;
+      if ((buf = malloc (size)) == NULL)
+	{
+	  ret = EOF;
+	  /* Try another size... */
+	  buf = malloc (BUFSIZ);
+	  size = BUFSIZ;
+	}
+      if (buf == NULL)
+        {
+          /* Can't allocate it, let's try another approach */
+nbf:
+          fp->_flags |= __SNBF;
+          fp->_w = 0;
+          fp->_bf._base = fp->_p = fp->_nbuf;
+          fp->_bf._size = 1;
+          _funlockfile (fp);
+          return (ret);
+        }
+      fp->_flags |= __SMBF;
+    }
+  /*
+   * Now put back whichever flag is needed, and fix _lbfsize
+   * if line buffered.  Ensure output flush on exit if the
+   * stream will be buffered at all.
+   * If buf is NULL then make _lbfsize 0 to force the buffer
+   * to be flushed and hence malloced on first use
+   */
+
+  switch (mode)
+    {
+    case _IOLBF:
+      fp->_flags |= __SLBF;
+      fp->_lbfsize = buf ? -size : 0;
+      /* FALLTHROUGH */
+
+    case _IOFBF:
+      /* no flag */
+      _REENT->__cleanup = _cleanup_r;
+      fp->_bf._base = fp->_p = (unsigned char *) buf;
+      fp->_bf._size = size;
+      break;
+    }
+
+  /*
+   * Patch up write count if necessary.
+   */
+
+  if (fp->_flags & __SWR)
+    fp->_w = fp->_flags & (__SLBF | __SNBF) ? 0 : size;
+
+  _funlockfile (fp);
+  return 0;
+}