Update.

1998-07-31 17:59  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/Makefile [subdir==misc] (sysdep_routines):
	Add sys_setresuid.

1998-07-30  Mark Kettenis  <kettenis@phys.uva.nl>

	* sysdeps/unix/sysv/linux/syscalls.list: Add __syscall_setresuid
	as real name for system call and make setresuid a weak alias.  Set
	caller to seteuid.
	* sysdeps/unix/sysv/linux/seteuid.c (seteuid): Implement using
	`setresuid' syscall if availble.  Fixes problems with sendmail
	which expects `seteuid' to not set the saved user ID.

1998-07-30 20:09 -0400  Zack Weinberg  <zack@rabi.phys.columbia.edu>

	* time/tzset.c (__tzstring): Get rid of excessive cleverness
	which was causing stack corruption.

1998-07-31 16:41 -0400  Zack Weinberg  <zack@rabi.phys.columbia.edu>

	* argp/argp-fmtstream.c (__argp_fmtstream_update): Correct
	off-by-one in wordwrap algorithm when there' a space at the
	beginning of the buffer.

1998-07-31 15:45  Ulrich Drepper  <drepper@cygnus.com>

	* Makerules (LDLIBS-c.so): Extend value instead of overwriting it.

7 files changed, 118 insertions, 54 deletions

diff --git a/ChangeLog b/ChangeLog
index 7e2e42b165..e918d29cac 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,32 @@
+1998-07-31 17:59  Ulrich Drepper  <drepper@cygnus.com>
+
+	* sysdeps/unix/sysv/linux/Makefile [subdir==misc] (sysdep_routines):
+	Add sys_setresuid.
+
+1998-07-30  Mark Kettenis  <kettenis@phys.uva.nl>
+
+	* sysdeps/unix/sysv/linux/syscalls.list: Add __syscall_setresuid
+	as real name for system call and make setresuid a weak alias.  Set
+	caller to seteuid.
+	* sysdeps/unix/sysv/linux/seteuid.c (seteuid): Implement using
+	`setresuid' syscall if availble.  Fixes problems with sendmail
+	which expects `seteuid' to not set the saved user ID.
+
+1998-07-30 20:09 -0400  Zack Weinberg  <zack@rabi.phys.columbia.edu>
+
+	* time/tzset.c (__tzstring): Get rid of excessive cleverness
+	which was causing stack corruption.
+
+1998-07-31 16:41 -0400  Zack Weinberg  <zack@rabi.phys.columbia.edu>
+
+	* argp/argp-fmtstream.c (__argp_fmtstream_update): Correct
+	off-by-one in wordwrap algorithm when there' a space at the
+	beginning of the buffer.
+
+1998-07-31 15:45  Ulrich Drepper  <drepper@cygnus.com>
+
+	* Makerules (LDLIBS-c.so): Extend value instead of overwriting it.
+
 1998-07-31 11:10  Ulrich Drepper  <drepper@cygnus.com>
 
 	* elf/elf.h: Add lots of new symbols from Irix and Solaris.
diff --git a/Makerules b/Makerules
index 1c79713732..e8930e32a5 100644
--- a/Makerules
+++ b/Makerules
@@ -396,7 +396,7 @@ elide-routines.ob += $(shared-only-routines)
 # since we define our own `.init' section specially.
 LDFLAGS-c.so = -nostdlib -nostartfiles
 # But we still want to link libc.so against $(gnulib).
-LDLIBS-c.so = $(gnulib)
+LDLIBS-c.so += $(gnulib)
 # Give libc.so an entry point and make it directly runnable itself.
 LDFLAGS-c.so += -e __libc_main
 # Pre-link the objects of libc_pic.a so that we can locally resolve
diff --git a/argp/argp-fmtstream.c b/argp/argp-fmtstream.c
index 05e9e21f06..1649f15cbb 100644
--- a/argp/argp-fmtstream.c
+++ b/argp/argp-fmtstream.c
@@ -213,10 +213,10 @@ __argp_fmtstream_update (argp_fmtstream_t fs)
 	  if (nextline > buf)
 	    {
 	      /* Swallow separating blanks.  */
-	      if (p > buf)
+	      if (p >= buf)
 		do
 		  --p;
-		while (p > buf && isblank (*p));
+		while (p >= buf && isblank (*p));
 	      nl = p + 1;	/* The newline will replace the first blank. */
 	    }
 	  else
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 7de1008716..af53184cb2 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -9,7 +9,7 @@ CPPFLAGS += -DHAVE_LLSEEK=1
 endif
 
 ifeq ($(subdir),misc)
-sysdep_routines += sysctl clone llseek getresuid getresgid
+sysdep_routines += sysctl clone llseek getresuid getresgid sys_setresuid
 
 sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h sys/mtio.h \
 		  sys/io.h sys/klog.h sys/kdaemon.h \
diff --git a/sysdeps/unix/sysv/linux/seteuid.c b/sysdeps/unix/sysv/linux/seteuid.c
index 37fb72c020..c8e3950cfa 100644
--- a/sysdeps/unix/sysv/linux/seteuid.c
+++ b/sysdeps/unix/sysv/linux/seteuid.c
@@ -1 +1,51 @@
-#include <sysdeps/unix/bsd/seteuid.c>
+/* Copyright (C) 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
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#ifdef __NR_setresuid
+
+extern int __syscall_setresuid (uid_t ruid, uid_t euid, uid_t suid);
+
+int
+seteuid (uid_t uid)
+{
+  int result;
+
+  if (uid == (uid_t) ~0)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+
+  /* First try the syscall.  */
+  result = __syscall_setresuid (-1, uid, -1);
+  if (result == -1 && errno == ENOSYS)
+    /* No system call available.  Use emulation.  This may not work
+       since `setreuid' also sets the saved user ID when UID is not
+       equal to the real user ID, making it impossible to switch back.  */
+    result = __setreuid (-1, uid);
+
+  return result;
+}
+#else
+# include <sysdeps/unix/bsd/seteuid.c>
+#endif
diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
index e80fd84568..6d06d0df99 100644
--- a/sysdeps/unix/sysv/linux/syscalls.list
+++ b/sysdeps/unix/sysv/linux/syscalls.list
@@ -71,12 +71,12 @@ setfsgid	EXTRA	setfsgid	1	setfsgid
 setfsuid	EXTRA	setfsuid	1	setfsuid
 setpgid		-	setpgid		2	__setpgid	setpgid
 setresgid	EXTRA	setresgid	3	setresgid
-setresuid	EXTRA	setresuid	3	setresuid
 sigaltstack	-	sigaltstack	2	__sigaltstack	sigaltstack
 sys_fstat	fxstat	fstat		2	__syscall_fstat
 sys_lstat	lxstat	lstat		2	__syscall_lstat
 sys_mknod	xmknod	mknod		3	__syscall_mknod
 sys_readv	readv	readv		3	__syscall_readv
+sys_setresuid	EXTRA	setresuid	3	__syscall_setresuid
 sys_stat	xstat	stat		2	__syscall_stat
 sys_writev	writev	writev		3	__syscall_writev
 sysinfo		EXTRA	sysinfo		1	sysinfo
diff --git a/time/tzset.c b/time/tzset.c
index 9c8e5d7b9c..d4e3037260 100644
--- a/time/tzset.c
+++ b/time/tzset.c
@@ -88,66 +88,51 @@ static int tz_compute __P ((time_t timer, const struct tm *tm))
      internal_function;
 static void tzset_internal __P ((int always)) internal_function;
 
-/* Header for a list of buffers containing time zone strings.  */
-struct tzstring_head
+/* List of buffers containing time zone strings. */
+struct tzstring_l
 {
-  struct tzstring_head *next;
-  /* The buffer itself immediately follows the header.
-     The buffer contains zero or more (possibly overlapping) strings.
-     The last string is followed by 2 '\0's instead of the usual 1.  */
+  struct tzstring_l *next;
+  size_t len;  /* strlen(data) - doesn't count terminating NUL! */
+  char data[0];
 };
 
-/* First in a list of buffers containing time zone strings.
-   All the buffers but the last are read-only.  */
-static struct
-{
-  struct tzstring_head head;
-  char data[48];
-} tzstring_list;
-
-/* Size of the last buffer in the list, not counting its header.  */
-static size_t tzstring_last_buffer_size = sizeof tzstring_list.data;
+struct tzstring_l *tzstring_list;
 
-/* Allocate a time zone string with given contents.
-   The string will never be moved or deallocated.
-   However, its contents may be shared with other such strings.  */
+/* Allocate a permanent home for S.  It will never be moved or deallocated,
+   but may share space with other strings.
+   Don't modify the returned string. */
 char *
-__tzstring (string)
-     const char *string;
+__tzstring (const char *s)
 {
-  struct tzstring_head *h;
-  size_t needed;
   char *p;
+  struct tzstring_l *t, *u, *new;
+  size_t len = strlen(s);
 
-  /* Look through time zone string list for a duplicate of this one.  */
-  for (h = &tzstring_list.head;  ;  h = h->next)
-    {
-      for (p = (char *) (h + 1);  p[0] | p[1];  ++p)
-	if (strcmp (p, string) == 0)
+  /* Walk the list and look for a match.  If this string is the same
+     as the end of an already-allocated string, it can share space. */
+  for (u = t = tzstring_list; t; u = t, t = t->next)
+    if (len <= t->len)
+      {
+	p = &t->data[t->len - len];
+	if (strcmp (s, p) == 0)
 	  return p;
-      if (! h->next)
-	break;
-    }
+      }
 
-  /* No duplicate was found.  Copy to the end of this buffer if there's room;
-     otherwise, append a large-enough new buffer to the list and use it.  */
-  ++p;
-  needed = strlen (string) + 2; /* Need 2 trailing '\0's after last string.  */
+  /* Not found; allocate a new buffer. */
+  new = malloc (sizeof (struct tzstring_l) + len + 1);
+  if (!new)
+    return NULL;
 
-  if ((size_t) ((char *) (h + 1) + tzstring_last_buffer_size - p) < needed)
-    {
-      size_t buffer_size = tzstring_last_buffer_size;
-      while ((buffer_size *= 2) < needed)
-	continue;
-      h = malloc (sizeof *h + buffer_size);
-      if (h == NULL)
-	return NULL;
-      h->next = NULL;
-      tzstring_last_buffer_size = buffer_size;
-      p = (char *) (h + 1);
-    }
+  new->next = NULL;
+  new->len = len;
+  strcpy (new->data, s);
+
+  if (u)
+    u->next = new;
+  else
+    tzstring_list = new;
 
-  return strncpy (p, string, needed);
+  return new->data;
 }
 
 static char *old_tz = NULL;