[thirdparty/gcc.git] / gcc / gcov-io.c

/* File format for coverage information
   Copyright (C) 1996, 1997, 1998, 2000, 2002,
   2003  Free Software Foundation, Inc.
   Contributed by Bob Manson <manson@cygnus.com>.
   Completely remangled by Nathan Sidwell <nathan@codesourcery.com>.

This file is part of GCC.

GCC 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.

GCC 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 GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

/* Routines declared in gcov-io.h.  This file should be #included by
   another source file, after having #included gcov-io.h.  */

/* Open a gcov file. NAME is the name of the file to open and MODE
   indicates whether a new file should be created, or an existing file
   opened for modification. If MODE is >= 0 an existing file will be
   opened, if possible, and if MODE is <= 0, a new file will be
   created. Use MODE=0 to attempt to reopen an existing file and then
   fall back on creating a new one.  Return zero on failure, >0 on
   opening an existing file and <0 on creating a new one.  */

GCOV_LINKAGE int
gcov_open (const char *name, int mode)
{
  int result = 1;
  size_t alloc = 1024;
#if defined (TARGET_HAS_F_SETLKW) && IN_LIBGCOV
  struct flock s_flock;

  s_flock.l_type = F_WRLCK;
  s_flock.l_whence = SEEK_SET;
  s_flock.l_start = 0;
  s_flock.l_len = 0; /* Until EOF.  */
  s_flock.l_pid = getpid ();
#endif
  
  if (gcov_var.file)
    abort ();
  gcov_var.position = gcov_var.length = 0;
  gcov_var.error = gcov_var.modified = 0;
  if (mode >= 0)
    gcov_var.file = fopen (name, "r+b");
  if (!gcov_var.file && mode <= 0)
    {
      result = -1;
      gcov_var.file = fopen (name, "w+b");
    }
  if (!gcov_var.file)
    return 0;

#if defined (TARGET_HAS_F_SETLKW) && IN_LIBGCOV
  while (fcntl (fileno (gcov_var.file), F_SETLKW, &s_flock)
	 && errno == EINTR)
    continue;
#endif

  if (result >= 0)
    {
      if (fseek (gcov_var.file, 0, SEEK_END))
	{
	  fclose (gcov_var.file);
	  gcov_var.file = 0;
	  return 0;
	}
      gcov_var.length = ftell (gcov_var.file);
      fseek (gcov_var.file, 0, SEEK_SET);
      alloc += gcov_var.length;
    }
  if (alloc > gcov_var.alloc)
    {
      if (gcov_var.buffer)
	free (gcov_var.buffer);
      gcov_var.alloc = alloc;
#if IN_LIBGCOV
      gcov_var.buffer = malloc (gcov_var.alloc);
      if (!gcov_var.buffer)
	{
	  fclose (gcov_var.file);
	  gcov_var.file = 0;
	  gcov_var.length = 0;
	  gcov_var.alloc = 0;
	  return 0;
	}
#else
      gcov_var.buffer = xmalloc (gcov_var.alloc);
#endif
    }
  if (result >= 0
      && fread (gcov_var.buffer, gcov_var.length, 1, gcov_var.file) != 1)
    {
      fclose (gcov_var.file);
      gcov_var.file = 0;
      gcov_var.length = 0;
      return 0;
    }
  return result;
}

/* Close the current gcov file. Flushes data to disk. Returns nonzero
   on failure or error flag set.  */

GCOV_LINKAGE int
gcov_close ()
{
  int result = 0;
  
  if (gcov_var.file)
    {
      if (gcov_var.modified
	  && (fseek (gcov_var.file, 0, SEEK_SET)
	      || fwrite (gcov_var.buffer, gcov_var.length,
			 1, gcov_var.file) != 1))
	result = 1;
      fclose (gcov_var.file);
      gcov_var.file = 0;
      gcov_var.length = 0;
    }
#if !IN_LIBGCOV
  free (gcov_var.buffer);
  gcov_var.alloc = 0;
  gcov_var.buffer = 0;
#endif
  return result ? 1 : gcov_var.error;
}

#if !IN_GCOV
/* Allocate space to write BYTES bytes to the gcov file. Return a
   pointer to those bytes, or NULL on failure.  */

GCOV_LINKAGE unsigned char *
gcov_write_bytes (unsigned bytes)
{
  char unsigned *result;

  if (gcov_var.position + bytes > gcov_var.alloc)
    {
      size_t new_size = (gcov_var.alloc + bytes) * 3 / 2;

      if (!gcov_var.buffer)
	return 0;
#if IN_LIBGCOV
      result = realloc (gcov_var.buffer, new_size);
      if (!result)
	{
	  free (gcov_var.buffer);
	  gcov_var.buffer = 0;
	  gcov_var.alloc = 0;
	  gcov_var.position = gcov_var.length = 0;
	  gcov_var.error = 1;
	  return 0;
	}
#else
      result = xrealloc (gcov_var.buffer, new_size);
#endif
      gcov_var.alloc = new_size;
      gcov_var.buffer = result;
    }
  
  result = &gcov_var.buffer[gcov_var.position];
  gcov_var.position += bytes;
  gcov_var.modified = 1;
  if (gcov_var.position > gcov_var.length)
    gcov_var.length = gcov_var.position;
  return result;
}

/* Write unsigned VALUE to coverage file.  Sets error flag
   appropriately.  */

GCOV_LINKAGE void
gcov_write_unsigned (unsigned value)
{
  unsigned char *buffer = gcov_write_bytes (4);
  unsigned ix;

  if (!buffer)
    return;
  for (ix = 4; ix--; )
    {
      buffer[ix] = value;
      value >>= 8;
    }
  if (sizeof (value) > 4 && value)
    gcov_var.error = -1;

  return;
}

/* Write counter VALUE to coverage file.  Sets error flag
   appropriately.  */

#if IN_LIBGCOV
GCOV_LINKAGE void
gcov_write_counter (gcov_type value)
{
  unsigned char *buffer = gcov_write_bytes (8);
  unsigned ix;

  if (!buffer)
    return;
  for (ix = 8; ix--; )
    {
      buffer[ix] = value;
      value >>= 8;
    }
  if ((sizeof (value) > 8 && value) || value < 0)
    gcov_var.error = -1;
  return;
}
#endif /* IN_LIBGCOV */

#if !IN_LIBGCOV
/* Write STRING to coverage file.  Sets error flag on file
   error, overflow flag on overflow */

GCOV_LINKAGE void
gcov_write_string (const char *string)
{
  unsigned length = 0;
  unsigned pad = 0;
  unsigned rem = 0;
  unsigned char *buffer;

  if (string)
    {
      length = strlen (string);
      rem = 4 - (length & 3);
    }
  
  buffer = gcov_write_bytes (4 + length + rem);
  if (buffer)
    {
      unsigned ix;
      unsigned value = length;
      
      for (ix = 4; ix--; )
	{
	  buffer[ix] = value;
	  value >>= 8;
	}
      memcpy (buffer + 4, string, length);
      memcpy (buffer + 4 + length, &pad, rem);
    }
}
#endif

/* Write a tag TAG and reserve space for the record length. Return a
   value to be used for gcov_write_length.  */

GCOV_LINKAGE unsigned long
gcov_write_tag (unsigned tag)
{
  unsigned long result = gcov_var.position;
  unsigned char *buffer = gcov_write_bytes (8);
  unsigned ix;

  if (!buffer)
    return 0;
  for (ix = 4; ix--; )
    {
      buffer[ix] = tag;
      tag >>= 8;
    }
  memset (buffer + 4, 0, 4);
  return result;
}

/* Write a record length using POSITION, which was returned by
   gcov_write_tag.  The current file position is the end of the
   record, and is restored before returning.  Returns nonzero on
   overflow.  */

GCOV_LINKAGE void
gcov_write_length (unsigned long position)
{
  if (position)
    {
      unsigned length = gcov_var.position - position - 8;
      unsigned char *buffer = &gcov_var.buffer[position + 4];
      unsigned ix;
      
      for (ix = 4; ix--; )
	{
	  buffer[ix] = length;
	  length >>= 8;
	}
    }
}

#if IN_LIBGCOV
/* Write a summary structure to the gcov file.  Return non-zero on
   overflow.  */

GCOV_LINKAGE void
gcov_write_summary (unsigned tag, const struct gcov_summary *summary)
{
  unsigned ix;
  const struct gcov_ctr_summary *csum;
  unsigned long base;

  base = gcov_write_tag (tag);
  gcov_write_unsigned (summary->checksum);
  for (csum = summary->ctrs, ix = GCOV_COUNTERS; ix--; csum++)
    {
      gcov_write_unsigned (csum->num);
      gcov_write_unsigned (csum->runs);
      gcov_write_counter (csum->sum_all);
      gcov_write_counter (csum->run_max);
      gcov_write_counter (csum->sum_max);
    }
  gcov_write_length (base);
}
#endif /* IN_LIBGCOV */

#endif /*!IN_GCOV */

/* Return a pointer to read BYTES bytes from the gcov file. Returns
   NULL on failure (read past EOF). */

GCOV_LINKAGE const unsigned char *
gcov_read_bytes (unsigned bytes)
{
  const unsigned char *result;
  
  if (gcov_var.position + bytes > gcov_var.length)
    {
      gcov_var.error = 1;
      return 0;
    }
  
  result = &gcov_var.buffer[gcov_var.position];
  gcov_var.position += bytes;
  return result;
}

/* Read unsigned value from a coverage file. Sets error flag on file
   error, overflow flag on overflow */

GCOV_LINKAGE unsigned
gcov_read_unsigned ()
{
  unsigned value = 0;
  unsigned ix;
  const unsigned char *buffer = gcov_read_bytes (4);

  if (!buffer)
    return 0;
  for (ix = sizeof (value); ix < 4; ix++)
    if (buffer[ix])
      gcov_var.error = -1;
  for (ix = 0; ix != 4; ix++)
    {
      value <<= 8;
      value |= buffer[ix];
    }
  return value;
}

/* Read counter value from a coverage file. Sets error flag on file
   error, overflow flag on overflow */

GCOV_LINKAGE gcov_type
gcov_read_counter ()
{
  gcov_type value = 0;
  unsigned ix;
  const unsigned char *buffer = gcov_read_bytes (8);

  if (!buffer)
    return 0;
  for (ix = sizeof (value); ix < 8; ix++)
    if (buffer[ix])
      gcov_var.error = -1;
  for (ix = 0; ix != 8; ix++)
    {
      value <<= 8;
      value |= buffer[ix];
    }
  if (value < 0)
    gcov_var.error = -1;
  return value;
}

/* Read string from coverage file. Returns a pointer to a static
   buffer, or NULL on empty string. You must copy the string before
   calling another gcov function.  */

#if !IN_LIBGCOV
GCOV_LINKAGE const char *
gcov_read_string ()
{
  unsigned length = gcov_read_unsigned ();
  
  if (!length)
    return 0;

  length += 4 - (length & 3);
  return (const char *) gcov_read_bytes (length);
}
#endif

GCOV_LINKAGE void
gcov_read_summary (struct gcov_summary *summary)
{
  unsigned ix;
  struct gcov_ctr_summary *csum;
  
  summary->checksum = gcov_read_unsigned ();
  for (csum = summary->ctrs, ix = GCOV_COUNTERS; ix--; csum++)
    {
      csum->num = gcov_read_unsigned ();
      csum->runs = gcov_read_unsigned ();
      csum->sum_all = gcov_read_counter ();
      csum->run_max = gcov_read_counter ();
      csum->sum_max = gcov_read_counter ();
    }
}

#if IN_GCOV > 0
/* Return the modification time of the current gcov file.  */

GCOV_LINKAGE time_t
gcov_time ()
{
  struct stat status;
  
  if (fstat (fileno (gcov_var.file), &status))
    return 0;
  else
    return status.st_mtime;
}
#endif /* IN_GCOV */
Commit	Line	Data
ca29da43 NS	1	/* File format for coverage information
	2	Copyright (C) 1996, 1997, 1998, 2000, 2002,
	3	2003 Free Software Foundation, Inc.
	4	Contributed by Bob Manson <manson@cygnus.com>.
	5	Completely remangled by Nathan Sidwell <nathan@codesourcery.com>.
	6
	7	This file is part of GCC.
	8
	9	GCC is free software; you can redistribute it and/or modify it under
	10	the terms of the GNU General Public License as published by the Free
	11	Software Foundation; either version 2, or (at your option) any later
	12	version.
	13
	14	GCC is distributed in the hope that it will be useful, but WITHOUT ANY
	15	WARRANTY; without even the implied warranty of MERCHANTABILITY or
	16	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	17	for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with GCC; see the file COPYING. If not, write to the Free
	21	Software Foundation, 59 Temple Place - Suite 330, Boston, MA
	22	02111-1307, USA. */
	23
	24	/* Routines declared in gcov-io.h. This file should be #included by
	25	another source file, after having #included gcov-io.h. */
	26
	27	/* Open a gcov file. NAME is the name of the file to open and MODE
	28	indicates whether a new file should be created, or an existing file
	29	opened for modification. If MODE is >= 0 an existing file will be
	30	opened, if possible, and if MODE is <= 0, a new file will be
	31	created. Use MODE=0 to attempt to reopen an existing file and then
	32	fall back on creating a new one. Return zero on failure, >0 on
	33	opening an existing file and <0 on creating a new one. */
	34
	35	GCOV_LINKAGE int
	36	gcov_open (const char *name, int mode)
	37	{
	38	int result = 1;
	39	size_t alloc = 1024;
	40	#if defined (TARGET_HAS_F_SETLKW) && IN_LIBGCOV
	41	struct flock s_flock;
	42
	43	s_flock.l_type = F_WRLCK;
	44	s_flock.l_whence = SEEK_SET;
	45	s_flock.l_start = 0;
	46	s_flock.l_len = 0; /* Until EOF. */
	47	s_flock.l_pid = getpid ();
	48	#endif
	49
	50	if (gcov_var.file)
	51	abort ();
	52	gcov_var.position = gcov_var.length = 0;
	53	gcov_var.error = gcov_var.modified = 0;
	54	if (mode >= 0)
	55	gcov_var.file = fopen (name, "r+b");
	56	if (!gcov_var.file && mode <= 0)
	57	{
	58	result = -1;
	59	gcov_var.file = fopen (name, "w+b");
	60	}
	61	if (!gcov_var.file)
	62	return 0;
	63
	64	#if defined (TARGET_HAS_F_SETLKW) && IN_LIBGCOV
65	while (fcntl (fileno (gcov_var.file), F_SETLKW, &s_flock)
66	&& errno == EINTR)
67	continue;
68	#endif
69
70	if (result >= 0)
71	{
72	if (fseek (gcov_var.file, 0, SEEK_END))
73	{
74	fclose (gcov_var.file);
75	gcov_var.file = 0;
76	return 0;
77	}
78	gcov_var.length = ftell (gcov_var.file);
79	fseek (gcov_var.file, 0, SEEK_SET);
80	alloc += gcov_var.length;
81	}
82	if (alloc > gcov_var.alloc)
83	{
84	if (gcov_var.buffer)
85	free (gcov_var.buffer);
86	gcov_var.alloc = alloc;
87	#if IN_LIBGCOV
88	gcov_var.buffer = malloc (gcov_var.alloc);
89	if (!gcov_var.buffer)
90	{
91	fclose (gcov_var.file);
92	gcov_var.file = 0;
93	gcov_var.length = 0;
94	gcov_var.alloc = 0;
95	return 0;
96	}
97	#else
98	gcov_var.buffer = xmalloc (gcov_var.alloc);
99	#endif
100	}
101	if (result >= 0
102	&& fread (gcov_var.buffer, gcov_var.length, 1, gcov_var.file) != 1)
103	{
104	fclose (gcov_var.file);
105	gcov_var.file = 0;
106	gcov_var.length = 0;
107	return 0;
108	}
109	return result;
110	}
111
112	/* Close the current gcov file. Flushes data to disk. Returns nonzero
113	on failure or error flag set. */
114
115	GCOV_LINKAGE int
116	gcov_close ()
117	{
118	int result = 0;
119
120	if (gcov_var.file)
121	{
122	if (gcov_var.modified
123	&& (fseek (gcov_var.file, 0, SEEK_SET)
124	\|\| fwrite (gcov_var.buffer, gcov_var.length,
125	1, gcov_var.file) != 1))
126	result = 1;
127	fclose (gcov_var.file);
128	gcov_var.file = 0;
129	gcov_var.length = 0;
130	}
131	#if !IN_LIBGCOV
132	free (gcov_var.buffer);
133	gcov_var.alloc = 0;
134	gcov_var.buffer = 0;
135	#endif
136	return result ? 1 : gcov_var.error;
137	}
138
139	#if !IN_GCOV
140	/* Allocate space to write BYTES bytes to the gcov file. Return a
141	pointer to those bytes, or NULL on failure. */
142
143	GCOV_LINKAGE unsigned char *
144	gcov_write_bytes (unsigned bytes)
145	{
146	char unsigned *result;
147
148	if (gcov_var.position + bytes > gcov_var.alloc)
149	{
150	size_t new_size = (gcov_var.alloc + bytes) * 3 / 2;
151
152	if (!gcov_var.buffer)
153	return 0;
154	#if IN_LIBGCOV
155	result = realloc (gcov_var.buffer, new_size);
156	if (!result)
157	{
158	free (gcov_var.buffer);
159	gcov_var.buffer = 0;
160	gcov_var.alloc = 0;
161	gcov_var.position = gcov_var.length = 0;
162	gcov_var.error = 1;
163	return 0;
164	}
165	#else
166	result = xrealloc (gcov_var.buffer, new_size);
167	#endif
168	gcov_var.alloc = new_size;
169	gcov_var.buffer = result;
170	}
171
172	result = &gcov_var.buffer[gcov_var.position];
173	gcov_var.position += bytes;
174	gcov_var.modified = 1;
175	if (gcov_var.position > gcov_var.length)
176	gcov_var.length = gcov_var.position;
177	return result;
178	}
179
180	/* Write unsigned VALUE to coverage file. Sets error flag
181	appropriately. */
182
183	GCOV_LINKAGE void
184	gcov_write_unsigned (unsigned value)
185	{
186	unsigned char *buffer = gcov_write_bytes (4);
187	unsigned ix;
188
189	if (!buffer)
190	return;
191	for (ix = 4; ix--; )
192	{
193	buffer[ix] = value;
194	value >>= 8;
195	}
196	if (sizeof (value) > 4 && value)
197	gcov_var.error = -1;
198
199	return;
200	}
201
202	/* Write counter VALUE to coverage file. Sets error flag
203	appropriately. */
204
205	#if IN_LIBGCOV
206	GCOV_LINKAGE void
207	gcov_write_counter (gcov_type value)
208	{
209	unsigned char *buffer = gcov_write_bytes (8);
210	unsigned ix;
211
212	if (!buffer)
213	return;
214	for (ix = 8; ix--; )
215	{
216	buffer[ix] = value;
217	value >>= 8;
218	}
219	if ((sizeof (value) > 8 && value) \|\| value < 0)
220	gcov_var.error = -1;
221	return;
222	}
223	#endif /* IN_LIBGCOV */
224
796621e8	225	#if !IN_LIBGCOV
ca29da43 NS	226	/* Write STRING to coverage file. Sets error flag on file
	227	error, overflow flag on overflow */
	228
	229	GCOV_LINKAGE void
	230	gcov_write_string (const char *string)
	231	{
	232	unsigned length = 0;
	233	unsigned pad = 0;
	234	unsigned rem = 0;
	235	unsigned char *buffer;
	236
	237	if (string)
	238	{
	239	length = strlen (string);
	240	rem = 4 - (length & 3);
	241	}
	242
	243	buffer = gcov_write_bytes (4 + length + rem);
	244	if (buffer)
	245	{
	246	unsigned ix;
	247	unsigned value = length;
	248
	249	for (ix = 4; ix--; )
	250	{
	251	buffer[ix] = value;
	252	value >>= 8;
	253	}
	254	memcpy (buffer + 4, string, length);
	255	memcpy (buffer + 4 + length, &pad, rem);
	256	}
	257	}
796621e8	258	#endif
ca29da43 NS	259
	260	/* Write a tag TAG and reserve space for the record length. Return a
	261	value to be used for gcov_write_length. */
	262
	263	GCOV_LINKAGE unsigned long
	264	gcov_write_tag (unsigned tag)
	265	{
	266	unsigned long result = gcov_var.position;
	267	unsigned char *buffer = gcov_write_bytes (8);
	268	unsigned ix;
	269
	270	if (!buffer)
	271	return 0;
	272	for (ix = 4; ix--; )
	273	{
	274	buffer[ix] = tag;
	275	tag >>= 8;
	276	}
	277	memset (buffer + 4, 0, 4);
	278	return result;
	279	}
	280
	281	/* Write a record length using POSITION, which was returned by
	282	gcov_write_tag. The current file position is the end of the
	283	record, and is restored before returning. Returns nonzero on
	284	overflow. */
	285
	286	GCOV_LINKAGE void
	287	gcov_write_length (unsigned long position)
	288	{
	289	if (position)
	290	{
	291	unsigned length = gcov_var.position - position - 8;
	292	unsigned char *buffer = &gcov_var.buffer[position + 4];
	293	unsigned ix;
	294
	295	for (ix = 4; ix--; )
	296	{
	297	buffer[ix] = length;
	298	length >>= 8;
	299	}
	300	}
	301	}
	302
	303	#if IN_LIBGCOV
	304	/* Write a summary structure to the gcov file. Return non-zero on
	305	overflow. */
	306
	307	GCOV_LINKAGE void
	308	gcov_write_summary (unsigned tag, const struct gcov_summary *summary)
	309	{
cdb23767 NS	310	unsigned ix;
cdb23767 NS	311	const struct gcov_ctr_summary *csum;
ca29da43 NS	312	unsigned long base;
	313
	314	base = gcov_write_tag (tag);
	315	gcov_write_unsigned (summary->checksum);
cdb23767 NS	316	for (csum = summary->ctrs, ix = GCOV_COUNTERS; ix--; csum++)
	317	{
	318	gcov_write_unsigned (csum->num);
	319	gcov_write_unsigned (csum->runs);
	320	gcov_write_counter (csum->sum_all);
	321	gcov_write_counter (csum->run_max);
	322	gcov_write_counter (csum->sum_max);
	323	}
ca29da43 NS	324	gcov_write_length (base);
	325	}
	326	#endif /* IN_LIBGCOV */
	327
	328	#endif /!IN_GCOV /
	329
	330	/* Return a pointer to read BYTES bytes from the gcov file. Returns
	331	NULL on failure (read past EOF). */
	332
	333	GCOV_LINKAGE const unsigned char *
	334	gcov_read_bytes (unsigned bytes)
	335	{
	336	const unsigned char *result;
	337
	338	if (gcov_var.position + bytes > gcov_var.length)
	339	{
	340	gcov_var.error = 1;
	341	return 0;
	342	}
	343
	344	result = &gcov_var.buffer[gcov_var.position];
	345	gcov_var.position += bytes;
	346	return result;
	347	}
	348
	349	/* Read unsigned value from a coverage file. Sets error flag on file
	350	error, overflow flag on overflow */
	351
	352	GCOV_LINKAGE unsigned
	353	gcov_read_unsigned ()
	354	{
	355	unsigned value = 0;
	356	unsigned ix;
	357	const unsigned char *buffer = gcov_read_bytes (4);
	358
	359	if (!buffer)
	360	return 0;
	361	for (ix = sizeof (value); ix < 4; ix++)
	362	if (buffer[ix])
	363	gcov_var.error = -1;
	364	for (ix = 0; ix != 4; ix++)
	365	{
	366	value <<= 8;
	367	value \|= buffer[ix];
	368	}
	369	return value;
	370	}
	371
	372	/* Read counter value from a coverage file. Sets error flag on file
	373	error, overflow flag on overflow */
	374
	375	GCOV_LINKAGE gcov_type
	376	gcov_read_counter ()
	377	{
	378	gcov_type value = 0;
	379	unsigned ix;
	380	const unsigned char *buffer = gcov_read_bytes (8);
	381
	382	if (!buffer)
	383	return 0;
	384	for (ix = sizeof (value); ix < 8; ix++)
	385	if (buffer[ix])
	386	gcov_var.error = -1;
	387	for (ix = 0; ix != 8; ix++)
388	{
389	value <<= 8;
390	value \|= buffer[ix];
391	}
392	if (value < 0)
393	gcov_var.error = -1;
394	return value;
395	}
396
397	/* Read string from coverage file. Returns a pointer to a static
398	buffer, or NULL on empty string. You must copy the string before
399	calling another gcov function. */
400
796621e8	401	#if !IN_LIBGCOV
ca29da43 NS	402	GCOV_LINKAGE const char *
	403	gcov_read_string ()
	404	{
	405	unsigned length = gcov_read_unsigned ();
	406
	407	if (!length)
	408	return 0;
	409
	410	length += 4 - (length & 3);
	411	return (const char *) gcov_read_bytes (length);
	412	}
796621e8	413	#endif
ca29da43 NS	414
	415	GCOV_LINKAGE void
	416	gcov_read_summary (struct gcov_summary *summary)
	417	{
cdb23767 NS	418	unsigned ix;
	419	struct gcov_ctr_summary *csum;
	420
ca29da43	421	summary->checksum = gcov_read_unsigned ();
cdb23767 NS	422	for (csum = summary->ctrs, ix = GCOV_COUNTERS; ix--; csum++)
	423	{
	424	csum->num = gcov_read_unsigned ();
	425	csum->runs = gcov_read_unsigned ();
	426	csum->sum_all = gcov_read_counter ();
	427	csum->run_max = gcov_read_counter ();
	428	csum->sum_max = gcov_read_counter ();
	429	}
ca29da43 NS	430	}
ca29da43 NS	431
ca29da43 NS	432	#if IN_GCOV > 0
	433	/* Return the modification time of the current gcov file. */
	434
	435	GCOV_LINKAGE time_t
	436	gcov_time ()
	437	{
	438	struct stat status;
	439
	440	if (fstat (fileno (gcov_var.file), &status))
	441	return 0;
	442	else
	443	return status.st_mtime;
	444	}
	445	#endif /* IN_GCOV */