Update.

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.

ChangeLog

@@ -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.

FAQ.in

@@ -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
+versions may not have all the features GNU libc requires.  The current
-supported platforms (for powerpc see question ?powerpc), 2.7.2.3 is
+releases of egcs (1.0.2) and GNU CC (2.8.1) should work with the GNU C
-the earliest version that works at all.
+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
+{AJ} There's only correct support for glibc 2.0.x in gcc 2.7.2.3 or
-or later.  You should get at least gcc 2.7.2.3.  All previous versions
+later.  But you should get at least gcc 2.8.1 or egcs 1.0.2 (or later
-had problems with glibc support.
+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

manual/Makefile

@@ -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;						\

manual/memory.texi

@@ -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}

string/bits/string2.h

@@ -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)
+  (__extension__ (__builtin_constant_p (s) && __string2_1bptr_p (s)	      \
-		  ? (((__const unsigned char *) (s))[0] == '\0'
+		  ? (((__const unsigned char *) (s))[0] == '\0'		      \
-		     ? return (char *) calloc (1, 1);
+		     ? (char *) calloc (1, 1)				      \
-		     : ({ size_t len = strlen (s) + 1;
+		     : ({ size_t __len = strlen (s) + 1;		      \
-			  char *retval = (char *) malloc (len);
+			  char *__retval = (char *) malloc (__len);	      \
-			  if (retval != NULL)
+			  if (__retval != NULL)				      \
-			    retval = (char *) memcpy (retval, s, len);
+			    __retval = (char *) memcpy (__retval, s, __len);  \
-			  retval; }))
+			  __retval; }))					      \
-		  : strdup (s)))
+		  : __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.  */

string/strdup.c

@@ -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

string/strndup.c

@@ -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

sysdeps/generic/strsep.c

@@ -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

timezone/Makefile

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