import newlib-2000-02-17 snapshot

1 files changed, 97 insertions, 0 deletions

diff --git a/newlib/libc/stdio/fread.c b/newlib/libc/stdio/fread.c
new file mode 100644
index 000000000..4de7ce290
--- /dev/null
+++ b/newlib/libc/stdio/fread.c
@@ -0,0 +1,97 @@
+/*
+ * 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
+<<fread>>---read array elements from a file
+
+INDEX
+	fread
+
+ANSI_SYNOPSIS
+	#include <stdio.h>
+	size_t fread(void *<[buf]>, size_t <[size]>, size_t <[count]>,
+		     FILE *<[fp]>);
+
+TRAD_SYNOPSIS
+	#include <stdio.h>
+	size_t fread(<[buf]>, <[size]>, <[count]>, <[fp]>)
+	char *<[buf]>;
+	size_t <[size]>;
+	size_t <[count]>;
+	FILE *<[fp]>;
+
+DESCRIPTION
+<<fread>> attempts to copy, from the file or stream identified by
+<[fp]>, <[count]> elements (each of size <[size]>) into memory,
+starting at <[buf]>.   <<fread>> may copy fewer elements than
+<[count]> if an error, or end of file, intervenes.
+
+<<fread>> also advances the file position indicator (if any) for
+<[fp]> by the number of @emph{characters} actually read.
+
+RETURNS
+The result of <<fread>> is the number of elements it succeeded in
+reading.
+
+PORTABILITY
+ANSI C requires <<fread>>.
+
+Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
+<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include "local.h"
+
+size_t
+_DEFUN (fread, (buf, size, count, fp),
+	_PTR buf _AND
+	size_t size _AND
+	size_t count _AND
+	FILE * fp)
+{
+  register size_t resid;
+  register char *p;
+  register int r;
+  size_t total;
+
+  if ((resid = count * size) == 0)
+    return 0;
+  if (fp->_r < 0)
+    fp->_r = 0;
+  total = resid;
+  p = buf;
+  while (resid > (r = fp->_r))
+    {
+      (void) memcpy ((void *) p, (void *) fp->_p, (size_t) r);
+      fp->_p += r;
+      /* fp->_r = 0 ... done in __srefill */
+      p += r;
+      resid -= r;
+      if (__srefill (fp))
+	{
+	  /* no more input: return partial result */
+	  return (total - resid) / size;
+	}
+    }
+  (void) memcpy ((void *) p, (void *) fp->_p, resid);
+  fp->_r -= resid;
+  fp->_p += resid;
+  return count;
+}