143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/* Machine-independent I/O routines for gcov.
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Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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Contributed by Bob Manson <manson@cygnus.com>.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef GCOV_IO_H
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#define GCOV_IO_H
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#include <stdio.h>
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#include <sys/types.h>
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static int __fetch_long PROTO ((long *, char *, int));
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static int __store_long PROTO ((long, char *, size_t));
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static int __read_long PROTO ((long *, FILE *, size_t));
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static int __write_long PROTO ((long, FILE *, size_t));
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/* These routines only work for signed values. */
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/* Store a portable representation of VALUE in DEST using BYTES*8-1 bits.
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Return a non-zero value if VALUE requires more than BYTES*8-1 bits
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to store. */
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static int
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__store_long (value, dest, bytes)
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long value;
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char *dest;
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size_t bytes;
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{
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int upper_bit = (value < 0 ? 128 : 0);
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size_t i;
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if (value < 0)
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{
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long oldvalue = value;
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value = -value;
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if (oldvalue != -value)
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return 1;
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}
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for(i = 0 ; i < (sizeof (value) < bytes ? sizeof (value) : bytes) ; i++) {
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dest[i] = value & (i == (bytes - 1) ? 127 : 255);
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value = value / 256;
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}
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if (value && value != -1)
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return 1;
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for(; i < bytes ; i++)
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dest[i] = 0;
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dest[bytes - 1] |= upper_bit;
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return 0;
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}
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/* Retrieve a quantity containing BYTES*8-1 bits from SOURCE and store
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the result in DEST. Returns a non-zero value if the value in SOURCE
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will not fit in DEST. */
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static int
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__fetch_long (dest, source, bytes)
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long *dest;
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char *source;
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int bytes;
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{
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long value = 0;
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int i;
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for (i = bytes - 1; i > (sizeof (*dest) - 1); i--)
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if (source[i] & (i == (bytes - 1) ? 127 : 255 ))
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return 1;
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for (; i >= 0; i--)
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value = value * 256 + (source[i] & (i == (bytes - 1) ? 127 : 255));
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if ((source[bytes - 1] & 128) && (value > 0))
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value = - value;
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*dest = value;
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return 0;
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}
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/* Write a BYTES*8-bit quantity to FILE, portably. Returns a non-zero
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value if the write fails, or if VALUE can't be stored in BYTES*8
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bits.
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Note that VALUE may not actually be large enough to hold BYTES*8
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bits, but BYTES characters will be written anyway.
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BYTES may be a maximum of 10. */
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static int
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__write_long (value, file, bytes)
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long value;
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FILE *file;
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size_t bytes;
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{
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char c[10];
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if (bytes > 10 || __store_long (value, c, bytes))
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return 1;
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else
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return fwrite(c, 1, bytes, file) != bytes;
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}
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/* Read a quantity containing BYTES bytes from FILE, portably. Return
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a non-zero value if the read fails or if the value will not fit
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in DEST.
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Note that DEST may not be large enough to hold all of the requested
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data, but the function will read BYTES characters anyway.
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BYTES may be a maximum of 10. */
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static int
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__read_long (dest, file, bytes)
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long *dest;
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FILE *file;
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size_t bytes;
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{
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char c[10];
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if (bytes > 10 || fread(c, 1, bytes, file) != bytes)
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return 1;
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else
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return __fetch_long (dest, c, bytes);
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}
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#endif
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