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1998-03-18  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* manual/memory.texi (Heap Consistency Checking): Document
	MALLOC_CHECK_.  Based on a text by Wolfram Gloger.

1998-03-18 17:11  Zack Weinberg  <zack@rabi.phys.columbia.edu>

	* manual/Makefile: Add missing rules.

1998-03-18  Ulrich Drepper  <drepper@cygnus.com>

	* timezone/Makefile (generated): Define to remove all stamp files.

	* sysdeps/generic/strsep.c: Also undefine __strsep.

	* string/strdup.c: Undefine __strdup and strdup first.
	* string/strndup.c: Likewise.

	* string/bits/string2.h: Correct strtok_r and strsep.
	Add strndup optimization.

	* sysdeps/generic/strsep.c: Little optimization.
This commit is contained in:
Ulrich Drepper 1998-03-18 17:57:13 +00:00
parent 3116126871
commit 7551a1e510
9 changed files with 107 additions and 25 deletions
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23
ChangeLog
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@ -1,3 +1,26 @@
1998-03-18 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* manual/memory.texi (Heap Consistency Checking): Document
MALLOC_CHECK_. Based on a text by Wolfram Gloger.
1998-03-18 17:11 Zack Weinberg <zack@rabi.phys.columbia.edu>
* manual/Makefile: Add missing rules.
1998-03-18 Ulrich Drepper <drepper@cygnus.com>
* timezone/Makefile (generated): Define to remove all stamp files.
* sysdeps/generic/strsep.c: Also undefine __strsep.
* string/strdup.c: Undefine __strdup and strdup first.
* string/strndup.c: Likewise.
* string/bits/string2.h: Correct strtok_r and strsep.
Add strndup optimization.
* sysdeps/generic/strsep.c: Little optimization.
1998-03-18 14:25 Ulrich Drepper <drepper@cygnus.com>
* string/bits/string2.h: Add optimization for strdup.

16
FAQ.in
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@ -55,9 +55,9 @@ and the many mirror sites. ftp.gnu.org is always overloaded, so try to find
a local mirror first.
You always should try to use the latest official release. Older
versions may not have all the features GNU libc requires. On most
supported platforms (for powerpc see question ?powerpc), 2.7.2.3 is
the earliest version that works at all.
versions may not have all the features GNU libc requires. The current
releases of egcs (1.0.2) and GNU CC (2.8.1) should work with the GNU C
library (for powerpc see question ?powerpc).
?? When I try to compile glibc I get only error messages.
What's wrong?
@ -83,7 +83,7 @@ Always get the newest release of GNU binutils available. Older
releases are known to have bugs that prevent a successful compilation.
{ZW} As of release 2.1 a linker supporting symbol versions is
required. For Linux, get binutils-2.8.1.0.17 or later. Other systems
required. For Linux, get binutils-2.8.1.0.23 or later. Other systems
may have native linker support, but it's moot right now, because glibc
has not been ported to them.
@ -481,9 +481,9 @@ GROUP ( libc.so.6 ld-linux.so.2 libc.a )
?? How can I compile gcc 2.7.2.1 from the gcc source code using
glibc 2.x?
{AJ} There's only correct support for glibc 2.0.x in gcc 2.7.2.3
or later. You should get at least gcc 2.7.2.3. All previous versions
had problems with glibc support.
{AJ} There's only correct support for glibc 2.0.x in gcc 2.7.2.3 or
later. But you should get at least gcc 2.8.1 or egcs 1.0.2 (or later
versions) instead.
?? The `gencat' utility cannot process the catalog sources which
were used on my Linux libc5 based system. Why?
@ -620,7 +620,7 @@ problem.
?? What do I need for C++ development?
{HJ,AJ} You need either egcs 1.0.1 or gcc-2.8.1 with libstdc++
{HJ,AJ} You need either egcs 1.0.2 or gcc-2.8.1 with libstdc++
2.8.1 (or more recent versions). libg++ 2.7.2 (and the Linux Versions
2.7.2.x) doesn't work very well with the GNU C library due to vtable thunks.
If you're upgrading from glibc 2.0.x to 2.1 you have to recompile

8
manual/Makefile
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@ -69,6 +69,12 @@ endef
libc.dvi libc.info: $(chapters) summary.texi $(chapters-incl)
libc.dvi: texinfo.tex
%.info: %.texinfo
$(MAKEINFO) $<
%.dvi: %.texinfo
$(TEXI2DVI) $<
# Generate the summary from the Texinfo source files for each chapter.
summary.texi: stamp-summary ;
stamp-summary: summary.awk $(chapters) $(chapters-incl)
@ -81,7 +87,7 @@ stamp-summary: summary.awk $(chapters) $(chapters-incl)
# Generate a file which can be added to the `dir' content to provide direct
# access to the documentation of the function, variables, and other
# definitions.
dir-add.texi: xtract-typefun.awk $(chapters) $(chapters-incl)
dir-add.texinfo: xtract-typefun.awk $(chapters) $(chapters-incl)
(echo "@dircategory GNU C library functions"; \
echo "@direntry"; \
$(GAWK) -f $^ | sort; \

14
manual/memory.texi
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@ -611,6 +611,20 @@ The block was already freed.
@end table
@end deftp
Another possibility to check for and guard against bugs in the use of
@code{malloc}, @code{realloc} and @code{free} is to set the environment
variable @code{MALLOC_CHECK_}. When @code{MALLOC_CHECK_} is set, a
special (less efficient) implementation is used which is designed to be
tolerant against simple errors, such as double calls of @code{free} with
the same argument, or overruns of a single byte (off-by-one bugs). Not
all such errors can be proteced against, however, and memory leaks can
result. If @code{MALLOC_CHECK_} is set to @code{0}, any detected heap
corruption is silently ignored; if set to @code{1}, a diagnostic is
printed on @code{stderr}; if set to @code{2}, @code{abort} is called
immediately. This can be useful because otherwise a crash may happen
much later, and the true cause for the problem is then very hard to
track down.
@node Hooks for Malloc
@subsection Storage Allocation Hooks
@cindex allocation hooks, for @code{malloc}

57
string/bits/string2.h
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@ -710,8 +710,8 @@ strnlen (__const char *__string, size_t __maxlen)
? (((__const unsigned char *) (sep))[0] != '\0' \
&& ((__const unsigned char *) (sep))[1] == '\0' \
? __strtok_r_1c (s, ((__const char *) (sep))[0], nextp) \
: strtok_r (s, sep, nextp)) \
: strtok_r (s, sep, nextp)))
: __strtok_r (s, sep, nextp)) \
: __strtok_r (s, sep, nextp)))
__STRING_INLINE char *__strtok_r_1c (char *__s, char __sep, char **__nextp);
__STRING_INLINE char *
@ -740,7 +740,7 @@ __strtok_r_1c (char *__s, char __sep, char **__nextp)
return __result;
}
# if defined __USE_POSIX || defined __USE_MISC
# define strtok_r(s, sep, nextp) __strtok_r (s, sep, nextp)
# define strtok_r(s, sep, nextp) __strtok_r ((s), (sep), (nextp))
# endif
#endif
@ -845,7 +845,7 @@ __strsep_g (char **__s, __const char *__reject)
return __retval;
}
# ifdef __USE_BSD
# define strsep(s, reject) __strsep (s, reject)
# define strsep(s, reject) __strsep ((s), (reject))
# endif
#endif
@ -857,15 +857,15 @@ __strsep_g (char **__s, __const char *__reject)
# include <stdlib.h>
# define __strdup(s) \
(__extension__ (__builtin_constant_p (s) && __string2_1bptr_p (s)
? (((__const unsigned char *) (s))[0] == '\0'
? return (char *) calloc (1, 1);
: ({ size_t len = strlen (s) + 1;
char *retval = (char *) malloc (len);
if (retval != NULL)
retval = (char *) memcpy (retval, s, len);
retval; }))
: strdup (s)))
(__extension__ (__builtin_constant_p (s) && __string2_1bptr_p (s) \
? (((__const unsigned char *) (s))[0] == '\0' \
? (char *) calloc (1, 1) \
: ({ size_t __len = strlen (s) + 1; \
char *__retval = (char *) malloc (__len); \
if (__retval != NULL) \
__retval = (char *) memcpy (__retval, s, __len); \
__retval; })) \
: __strdup (s)))
# if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
# define strdup(s) __strdup (s)
@ -873,6 +873,37 @@ __strsep_g (char **__s, __const char *__reject)
#endif
#if !defined _HAVE_STRING_ARCH_strndup && !defined __STRICT_ANSI__
/* We need the memory allocation functions. Including this header is
not allowed. */
# include <stdlib.h>
# define __strndup(s, n) \
(__extension__ (__builtin_constant_p (s) && __string2_1bptr_p (s) \
? (((__const unsigned char *) (s))[0] == '\0' \
? (char *) calloc (1, 1) \
: ({ size_t __len = strlen (s) + 1; \
size_t __n = (n); \
char *__retval; \
if (__n < __len) \
__len = __n; \
__retval = (char *) malloc (__len); \
if (__retval != NULL) \
{ \
__retval[__len - 1] = '\0'; \
__retval = (char *) memcpy (__retval, s, \
__len - 1); \
} \
__retval; })) \
: __strndup ((s), (n))))
# ifdef __GNU_SOURCE
# define strndup(s, n) __strndup ((s), (n))
# endif
#endif
#undef __STRING_INLINE
#endif /* No string inlines. */

5
string/strdup.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1991, 1996, 1997 Free Software Foundation, Inc.
/* Copyright (C) 1991, 1996, 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -28,6 +28,9 @@ char *malloc ();
char *memcpy ();
#endif
#undef __strdup
#undef strdup
#ifndef weak_alias
# define __strdup strdup
#endif

5
string/strndup.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -30,6 +30,9 @@
char *malloc ();
#endif
#undef __strndup
#undef strndup
#ifndef weak_alias
# define __strndup strndup
#endif

3
sysdeps/generic/strsep.c
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@ -18,6 +18,7 @@
#include <string.h>
#undef __strsep
#undef strsep
char *
@ -43,7 +44,7 @@ __strsep (char **stringp, const char *delim)
if (*begin == ch)
end = begin;
else
end = strchr (begin, delim[0]);
end = strchr (begin + 1, ch);
}
}
else

1
timezone/Makefile
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@ -39,6 +39,7 @@ tzfiles := $(tzbases) $(tzlinks)
# northamerica.
distribute += $(tzfiles) leapseconds pacificnew simplebackw
generated := $(addprefix z.,$(tzfiles))
install-sbin := zic zdump
generated-dirs = testdata