Initial revision

From-SVN: r13824

gcc/gcov-io.h

+/* Machine-independent I/O routines for gcov.
+   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+   Contributed by Bob Manson <manson@cygnus.com>.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#ifndef GCOV_IO_H
+#define GCOV_IO_H
+#include <stdio.h>
+
+/* These routines only work for signed values. */
+
+/* Store a portable representation of VALUE in DEST using BYTES*8-1 bits.
+   Return a non-zero value if VALUE requires more than BYTES*8-1 bits
+   to store. */
+
+static int
+__store_long (value, dest, bytes)
+     long value;
+     char *dest;
+     int bytes;
+{
+  int upper_bit = (value < 0 ? 128 : 0);
+  int i;
+
+  if (value < 0)
+    {
+      long oldvalue = value;
+      value = -value;
+      if (oldvalue != -value)
+	return 1;
+    }
+
+  for(i = 0 ; i < (sizeof (value) < bytes ? sizeof (value) : bytes) ; i++) {
+    dest[i] = value & (i == (bytes - 1) ? 127 : 255);
+    value = value / 256;
+  }
+
+  if (value && value != -1)
+    return 1;
+
+  for(; i < bytes ; i++) 
+    dest[i] = 0;
+  dest[bytes - 1] |= upper_bit;
+  return 0;
+}
+
+/* Retrieve a quantity containing BYTES*8-1 bits from SOURCE and store
+   the result in DEST. Returns a non-zero value if the value in SOURCE
+   will not fit in DEST. */
+
+static int
+__fetch_long (dest, source, bytes)
+     long *dest;
+     char *source;
+     int bytes;
+{
+  long value = 0;
+  int i;
+
+  for (i = bytes - 1; i > (sizeof (*dest) - 1); i--)
+    if (source[i] & (i == (bytes - 1) ? 127 : 255 ))
+      return 1;
+
+  for (; i >= 0; i--)
+    value = value * 256 + (source[i] & (i == (bytes - 1) ? 127 : 255));
+
+  if ((source[bytes - 1] & 128) && (value > 0))
+    value = - value;
+
+  *dest = value;
+  return 0;
+}
+
+/* Write a BYTES*8-bit quantity to FILE, portably. Returns a non-zero
+   value if the write fails, or if VALUE can't be stored in BYTES*8
+   bits.
+
+   Note that VALUE may not actually be large enough to hold BYTES*8
+   bits, but BYTES characters will be written anyway.
+
+   BYTES may be a maximum of 10. */
+
+static int
+__write_long (value, file, bytes)
+     long value;
+     FILE *file;
+     int bytes;
+{
+  char c[10];
+
+  if (bytes > 10 || __store_long (value, c, bytes))
+    return 1;
+  else
+    return fwrite(c, 1, bytes, file) != bytes;
+}
+
+/* Read a quantity containing BYTES bytes from FILE, portably. Return
+   a non-zero value if the read fails or if the value will not fit
+   in DEST.
+
+   Note that DEST may not be large enough to hold all of the requested
+   data, but the function will read BYTES characters anyway.
+
+   BYTES may be a maximum of 10. */
+
+static int
+__read_long (dest, file, bytes)
+     long *dest;
+     FILE *file;
+     int bytes;
+{
+  char c[10];
+
+  if (bytes > 10 || fread(c, 1, bytes, file) != bytes)
+    return 1;
+  else
+    return __fetch_long (dest, c, bytes);
+}
+
+#endif