Thu Mar 14 06:01:07 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu>

* string/strnlen.c: New file.
	* string/Makefile (routines): Add strnlen.
	* string/string.h [__USE_GNU] (strnlen): Declare new function.
	[__OPTIMIZE__]: Define extern inline implementation of it.

string/Makefile

@@ -1,4 +1,4 @@
-# Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+# Copyright (C) 1991, 92, 93, 94, 95, 96 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
@@ -24,7 +24,8 @@ subdir	:= string
 headers	:= string.h strings.h memory.h endian.h bytesex.h
 
 routines	:= strcat strchr strcmp strcoll strcpy strcspn strdup	\
-		   strerror _strerror strlen strncat strncmp strncpy 	\
+		   strerror _strerror strlen strnlen			\
+		   strncat strncmp strncpy				\
 		   strrchr strpbrk strsignal strspn strstr strtok	\
 		   strxfrm memchr memcmp memmove memset			\
 		   bcopy bzero ffs stpcpy stpncpy			\

string/string.h

@@ -127,9 +127,26 @@ extern __ptr_t memmem __P ((__const __ptr_t __haystack, size_t __haystacklen,
 			    __const __ptr_t __needle, size_t __needlelen));
 #endif
 
+
 /* Return the length of S.  */
 extern size_t strlen __P ((__const char *__s));
 
+#ifdef	__USE_GNU
+/* Find the length of STRING, but scan at most MAXLEN characters.
+   If no '\0' terminator is found in that many characters, return MAXLEN.  */
+extern size_t strnlen __P ((__const char *__string, size_t __maxlen));
+
+#ifdef	__OPTIMIZE__
+extern __inline size_t
+strnlen (__const char *__string, size_t __maxlen)
+{
+  __const char *__end = memchr (__string, '\0', __maxlen);
+  return __end ? __end - __string : __maxlen;
+}
+#endif
+#endif
+
+
 /* Return a string describing the meaning of the `errno' code in ERRNUM.  */
 extern char *strerror __P ((int __errnum));
 #ifdef	__USE_REENTRANT

string/strnlen.c

@@ -0,0 +1,30 @@
+/* Find the length of STRING, but scan at most MAXLEN characters.
+Copyright (C) 1996 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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <string.h>
+
+/* Find the length of STRING, but scan at most MAXLEN characters.
+   If no '\0' terminator is found in that many characters, return MAXLEN.  */
+
+size_t
+strnlen (const char *string, size_t maxlen)
+{
+  const char *end = memchr (string, '\0', maxlen);
+  return end ? end - string : maxlen;
+}

sysdeps/unix/sysv/linux/init-first.c

@@ -32,22 +32,18 @@ extern void __libc_global_ctors (void);
 static void
 init (int *data)
 {
+  extern int __personality (int);
+
   int argc = *data;
   char **argv = (void *) (data + 1);
   char **envp = &argv[argc + 1];
 
-#ifdef __i386__
-  /* Make sure we are not using the iBSC2 personality.  The `personality'
-     syscall takes one argument; zero means the Linux personality.  The
-     argument arrives in %ebx; we have to save and restore %ebx by hand
-     here, because GCC (as of 2.7.0) cannot handle saving and restoring it
-     for us when it is the dedicated GOT register for PIC.  */
-  asm ("pushl %%ebx\n"
-       "xorl %%ebx, %%ebx\n"
-       "int $0x80 # syscall no %0\n"
-       "popl %%ebx"
-       : : "a" (SYS_ify (personality)));
-#endif
+  /* The `personality' system call takes one argument that chooses the
+     "personality", i.e. the set of system calls and such.  Zero is the
+     native Linux value; we must make this call first thing to disable
+     emulation of some other system that might have been enabled by default
+     based on the executable format.  */
+  __personality (0);
 
   /* Set the FPU control word to the proper default value.  */
   __setfpucw (__fpu_control);

sysdeps/unix/sysv/linux/syscalls.list

@@ -15,6 +15,7 @@ mlockall	-	mlockall	1	__mlockall	mlockall
 mount		-	mount		5	__mount	mount
 munlock		-	munlock		2	__munlock	munlock
 munlockall	-	munlockall	0	__munlockall	munlockall
+personality	init-first personality	1	__personality	personality
 pipe		-	pipe		1	__pipe	pipe
 reboot		-	reboot		3	reboot
 s_ptrace	ptrace	ptrace		4	__syscall_ptrace