306 lines
7.1 KiB
C
306 lines
7.1 KiB
C
/* Machine-independent I/O routines for gcov.
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Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
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Contributed by Bob Manson <manson@cygnus.com>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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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 GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public
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License. */
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#ifndef GCC_GCOV_IO_H
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#define GCC_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 PARAMS ((long *, char *, size_t))
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ATTRIBUTE_UNUSED;
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static int __read_long PARAMS ((long *, FILE *, size_t))
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ATTRIBUTE_UNUSED;
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static int __write_long PARAMS ((long, FILE *, size_t))
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ATTRIBUTE_UNUSED;
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static int __fetch_gcov_type PARAMS ((gcov_type *, char *, size_t))
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ATTRIBUTE_UNUSED;
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static int __store_gcov_type PARAMS ((gcov_type, char *, size_t))
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ATTRIBUTE_UNUSED;
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static int __read_gcov_type PARAMS ((gcov_type *, FILE *, size_t))
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ATTRIBUTE_UNUSED;
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static int __write_gcov_type PARAMS ((gcov_type, FILE *, size_t))
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ATTRIBUTE_UNUSED;
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static int __write_gcov_string PARAMS ((const char *, size_t, FILE*, long))
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ATTRIBUTE_UNUSED;
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static int __read_gcov_string PARAMS ((char *, size_t, FILE*, long))
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ATTRIBUTE_UNUSED;
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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 nonzero 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_gcov_type (value, dest, bytes)
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gcov_type 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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gcov_type 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 nonzero 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_gcov_type (dest, source, bytes)
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gcov_type *dest;
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char *source;
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size_t bytes;
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{
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gcov_type value = 0;
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int i;
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for (i = bytes - 1; (size_t) i > (sizeof (*dest) - 1); i--)
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if (source[i] & ((size_t) 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] & ((size_t)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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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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size_t 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; (size_t) i > (sizeof (*dest) - 1); i--)
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if (source[i] & ((size_t) 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] & ((size_t)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 nonzero
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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_gcov_type (value, file, bytes)
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gcov_type 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_gcov_type (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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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_gcov_type ((gcov_type)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 nonzero 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_gcov_type (dest, file, bytes)
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gcov_type *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_gcov_type (dest, c, bytes);
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}
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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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/* Writes string in gcov format. */
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static int
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__write_gcov_string (string, length, file, delim)
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const char *string;
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size_t length;
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FILE *file;
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long delim;
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{
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size_t temp = length + 1;
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/* delimiter */
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if (__write_long (delim, file, 4) != 0)
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return 1;
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if (__write_long (length, file, 4) != 0)
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return 1;
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if (fwrite (string, temp, 1, file) != 1)
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return 1;
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temp &= 3;
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if (temp)
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{
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char c[4];
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c[0] = c[1] = c[2] = c[3] = 0;
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if (fwrite (c, sizeof (char), 4 - temp, file) != 4 - temp)
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return 1;
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}
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if (__write_long (delim, file, 4) != 0)
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return 1;
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return 0;
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}
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/* Reads string in gcov format. */
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static int
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__read_gcov_string (string, max_length, file, delim)
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char *string;
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size_t max_length;
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FILE *file;
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long delim;
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{
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long delim_from_file;
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long length;
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long read_length;
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long tmp;
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if (__read_long (&delim_from_file, file, 4) != 0)
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return 1;
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if (delim_from_file != delim)
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return 1;
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if (__read_long (&length, file, 4) != 0)
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return 1;
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if (length > (long) max_length)
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read_length = max_length;
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else
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read_length = length;
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tmp = (((length + 1) - 1) / 4 + 1) * 4;
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/* This is the size occupied by the string in the file */
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if (fread (string, read_length, 1, file) != 1)
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return 1;
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string[read_length] = 0;
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if (fseek (file, tmp - read_length, SEEK_CUR) < 0)
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return 1;
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if (__read_long (&delim_from_file, file, 4) != 0)
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return 1;
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if (delim_from_file != delim)
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return 1;
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return 0;
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}
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#endif /* ! GCC_GCOV_IO_H */
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