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aclocal.m4: New file with new test libiberty_AC_FUNC_STRNCMP.

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* aclocal.m4: New file with new test libiberty_AC_FUNC_STRNCMP.

	* configure.in (AC_CHECK_HEADERS): Add sys/mman.h fcntl.h.
	(libiberty_AC_FUNC_STRNCMP): Invoke.

	* strncmp.c: New file.

From-SVN: r33498
This commit is contained in:
Kaveh R. Ghazi 2000-04-28 01:42:43 +00:00 committed by Kaveh Ghazi
parent b9550bfbc6
commit a9266bfa4a
6 changed files with 479 additions and 2 deletions
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9
libiberty/ChangeLog
View File

@ -1,3 +1,12 @@
2000-04-27 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* aclocal.m4: New file with new test libiberty_AC_FUNC_STRNCMP.
* configure.in (AC_CHECK_HEADERS): Add sys/mman.h fcntl.h.
(libiberty_AC_FUNC_STRNCMP): Invoke.
* strncmp.c: New file.
Thu Apr 27 16:58:43 MET DST 2000 Jan Hubicka <jh@suse.cz>
* hashtab.c (htab_expand): Add prototype.

71
libiberty/aclocal.m4 vendored Normal file
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@ -0,0 +1,71 @@
dnl See whether strncmp reads past the end of its string parameters.
dnl On some versions of SunOS4 at least, strncmp reads a word at a time
dnl but erroneously reads past the end of strings. This can cause
dnl a SEGV in some cases.
AC_DEFUN(libiberty_AC_FUNC_STRNCMP,
[AC_REQUIRE([AC_FUNC_MMAP])
AC_CACHE_CHECK([for working strncmp], ac_cv_func_strncmp_works,
[AC_TRY_RUN([
/* Test by Jim Wilson and Kaveh Ghazi.
Check whether strncmp reads past the end of its string parameters. */
#include <sys/types.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#ifndef MAP_ANON
#ifdef MAP_ANONYMOUS
#define MAP_ANON MAP_ANONYMOUS
#else
#define MAP_ANON MAP_FILE
#endif
#endif
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
#ifndef O_RDONLY
#define O_RDONLY 0
#endif
#define MAP_LEN 0x10000
main ()
{
#if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
char *p;
int dev_zero;
dev_zero = open ("/dev/zero", O_RDONLY);
if (dev_zero < 0)
exit (1);
p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
MAP_ANON|MAP_PRIVATE, dev_zero, 0);
if (p == (char *)-1)
exit (2);
else
{
char *string = "__si_type_info";
char *q = (char *) p + MAP_LEN - strlen (string) - 2;
char *r = (char *) p + 0xe;
strcpy (q, string);
strcpy (r, string);
strncmp (r, q, 14);
}
#endif /* HAVE_MMAP || HAVE_MMAP_ANYWHERE */
exit (0);
}
], ac_cv_func_strncmp_works=yes, ac_cv_func_strncmp_works=no,
ac_cv_func_strncmp_works=no)
rm -f core core.* *.core])
if test $ac_cv_func_strncmp_works = no ; then
LIBOBJS="$LIBOBJS strncmp.o"
fi
])

9
libiberty/config.in
View File

@ -13,6 +13,9 @@
/* Define if you have <alloca.h> and it should be used (not on Ultrix). */
#undef HAVE_ALLOCA_H
/* Define if you have a working `mmap' system call. */
#undef HAVE_MMAP
/* Define if you have <sys/wait.h> that is POSIX.1 compatible. */
#undef HAVE_SYS_WAIT_H
@ -196,6 +199,9 @@
/* Define if you have the waitpid function. */
#undef HAVE_WAITPID
/* Define if you have the <fcntl.h> header file. */
#undef HAVE_FCNTL_H
/* Define if you have the <stdlib.h> header file. */
#undef HAVE_STDLIB_H
@ -208,6 +214,9 @@
/* Define if you have the <sys/file.h> header file. */
#undef HAVE_SYS_FILE_H
/* Define if you have the <sys/mman.h> header file. */
#undef HAVE_SYS_MMAN_H
/* Define if you have the <sys/param.h> header file. */
#undef HAVE_SYS_PARAM_H

360
libiberty/configure vendored
View File

@ -1058,7 +1058,7 @@ else
fi
echo "$ac_t""$CPP" 1>&6
for ac_hdr in sys/file.h sys/param.h stdlib.h string.h unistd.h strings.h sys/time.h sys/resource.h sys/stat.h
for ac_hdr in sys/file.h sys/param.h stdlib.h string.h unistd.h strings.h sys/time.h sys/resource.h sys/stat.h sys/mman.h fcntl.h
do
ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
@ -2550,6 +2550,364 @@ done
fi
for ac_hdr in unistd.h
do
ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
echo "configure:2558: checking for $ac_hdr" >&5
if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.$ac_ext <<EOF
#line 2563 "configure"
#include "confdefs.h"
#include <$ac_hdr>
EOF
ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
{ (eval echo configure:2568: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
if test -z "$ac_err"; then
rm -rf conftest*
eval "ac_cv_header_$ac_safe=yes"
else
echo "$ac_err" >&5
echo "configure: failed program was:" >&5
cat conftest.$ac_ext >&5
rm -rf conftest*
eval "ac_cv_header_$ac_safe=no"
fi
rm -f conftest*
fi
if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
echo "$ac_t""yes" 1>&6
ac_tr_hdr=HAVE_`echo $ac_hdr | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
cat >> confdefs.h <<EOF
#define $ac_tr_hdr 1
EOF
else
echo "$ac_t""no" 1>&6
fi
done
for ac_func in getpagesize
do
echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
echo "configure:2597: checking for $ac_func" >&5
if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
cat > conftest.$ac_ext <<EOF
#line 2602 "configure"
#include "confdefs.h"
/* System header to define __stub macros and hopefully few prototypes,
which can conflict with char $ac_func(); below. */
#include <assert.h>
/* Override any gcc2 internal prototype to avoid an error. */
/* We use char because int might match the return type of a gcc2
builtin and then its argument prototype would still apply. */
char $ac_func();
int main() {
/* The GNU C library defines this for functions which it implements
to always fail with ENOSYS. Some functions are actually named
something starting with __ and the normal name is an alias. */
#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
choke me
#else
$ac_func();
#endif
; return 0; }
EOF
if { (eval echo configure:2625: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
rm -rf conftest*
eval "ac_cv_func_$ac_func=yes"
else
echo "configure: failed program was:" >&5
cat conftest.$ac_ext >&5
rm -rf conftest*
eval "ac_cv_func_$ac_func=no"
fi
rm -f conftest*
fi
if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
echo "$ac_t""yes" 1>&6
ac_tr_func=HAVE_`echo $ac_func | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
cat >> confdefs.h <<EOF
#define $ac_tr_func 1
EOF
else
echo "$ac_t""no" 1>&6
fi
done
echo $ac_n "checking for working mmap""... $ac_c" 1>&6
echo "configure:2650: checking for working mmap" >&5
if eval "test \"`echo '$''{'ac_cv_func_mmap_fixed_mapped'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
if test "$cross_compiling" = yes; then
ac_cv_func_mmap_fixed_mapped=no
else
cat > conftest.$ac_ext <<EOF
#line 2658 "configure"
#include "confdefs.h"
/* Thanks to Mike Haertel and Jim Avera for this test.
Here is a matrix of mmap possibilities:
mmap private not fixed
mmap private fixed at somewhere currently unmapped
mmap private fixed at somewhere already mapped
mmap shared not fixed
mmap shared fixed at somewhere currently unmapped
mmap shared fixed at somewhere already mapped
For private mappings, we should verify that changes cannot be read()
back from the file, nor mmap's back from the file at a different
address. (There have been systems where private was not correctly
implemented like the infamous i386 svr4.0, and systems where the
VM page cache was not coherent with the filesystem buffer cache
like early versions of FreeBSD and possibly contemporary NetBSD.)
For shared mappings, we should conversely verify that changes get
propogated back to all the places they're supposed to be.
Grep wants private fixed already mapped.
The main things grep needs to know about mmap are:
* does it exist and is it safe to write into the mmap'd area
* how to use it (BSD variants) */
#include <sys/types.h>
#include <fcntl.h>
#include <sys/mman.h>
/* This mess was copied from the GNU getpagesize.h. */
#ifndef HAVE_GETPAGESIZE
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# endif
/* Assume that all systems that can run configure have sys/param.h. */
# ifndef HAVE_SYS_PARAM_H
# define HAVE_SYS_PARAM_H 1
# endif
# ifdef _SC_PAGESIZE
# define getpagesize() sysconf(_SC_PAGESIZE)
# else /* no _SC_PAGESIZE */
# ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
# ifdef EXEC_PAGESIZE
# define getpagesize() EXEC_PAGESIZE
# else /* no EXEC_PAGESIZE */
# ifdef NBPG
# define getpagesize() NBPG * CLSIZE
# ifndef CLSIZE
# define CLSIZE 1
# endif /* no CLSIZE */
# else /* no NBPG */
# ifdef NBPC
# define getpagesize() NBPC
# else /* no NBPC */
# ifdef PAGESIZE
# define getpagesize() PAGESIZE
# endif /* PAGESIZE */
# endif /* no NBPC */
# endif /* no NBPG */
# endif /* no EXEC_PAGESIZE */
# else /* no HAVE_SYS_PARAM_H */
# define getpagesize() 8192 /* punt totally */
# endif /* no HAVE_SYS_PARAM_H */
# endif /* no _SC_PAGESIZE */
#endif /* no HAVE_GETPAGESIZE */
#ifdef __cplusplus
extern "C" { void *malloc(unsigned); }
#else
char *malloc();
#endif
int
main()
{
char *data, *data2, *data3;
int i, pagesize;
int fd;
pagesize = getpagesize();
/*
* First, make a file with some known garbage in it.
*/
data = malloc(pagesize);
if (!data)
exit(1);
for (i = 0; i < pagesize; ++i)
*(data + i) = rand();
umask(0);
fd = creat("conftestmmap", 0600);
if (fd < 0)
exit(1);
if (write(fd, data, pagesize) != pagesize)
exit(1);
close(fd);
/*
* Next, try to mmap the file at a fixed address which
* already has something else allocated at it. If we can,
* also make sure that we see the same garbage.
*/
fd = open("conftestmmap", O_RDWR);
if (fd < 0)
exit(1);
data2 = malloc(2 * pagesize);
if (!data2)
exit(1);
data2 += (pagesize - ((int) data2 & (pagesize - 1))) & (pagesize - 1);
if (data2 != mmap(data2, pagesize, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_FIXED, fd, 0L))
exit(1);
for (i = 0; i < pagesize; ++i)
if (*(data + i) != *(data2 + i))
exit(1);
/*
* Finally, make sure that changes to the mapped area
* do not percolate back to the file as seen by read().
* (This is a bug on some variants of i386 svr4.0.)
*/
for (i = 0; i < pagesize; ++i)
*(data2 + i) = *(data2 + i) + 1;
data3 = malloc(pagesize);
if (!data3)
exit(1);
if (read(fd, data3, pagesize) != pagesize)
exit(1);
for (i = 0; i < pagesize; ++i)
if (*(data + i) != *(data3 + i))
exit(1);
close(fd);
unlink("conftestmmap");
exit(0);
}
EOF
if { (eval echo configure:2798: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
then
ac_cv_func_mmap_fixed_mapped=yes
else
echo "configure: failed program was:" >&5
cat conftest.$ac_ext >&5
rm -fr conftest*
ac_cv_func_mmap_fixed_mapped=no
fi
rm -fr conftest*
fi
fi
echo "$ac_t""$ac_cv_func_mmap_fixed_mapped" 1>&6
if test $ac_cv_func_mmap_fixed_mapped = yes; then
cat >> confdefs.h <<\EOF
#define HAVE_MMAP 1
EOF
fi
echo $ac_n "checking for working strncmp""... $ac_c" 1>&6
echo "configure:2822: checking for working strncmp" >&5
if eval "test \"`echo '$''{'ac_cv_func_strncmp_works'+set}'`\" = set"; then
echo $ac_n "(cached) $ac_c" 1>&6
else
if test "$cross_compiling" = yes; then
ac_cv_func_strncmp_works=no
else
cat > conftest.$ac_ext <<EOF
#line 2830 "configure"
#include "confdefs.h"
/* Test by Jim Wilson and Kaveh Ghazi.
Check whether strncmp reads past the end of its string parameters. */
#include <sys/types.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#ifndef MAP_ANON
#ifdef MAP_ANONYMOUS
#define MAP_ANON MAP_ANONYMOUS
#else
#define MAP_ANON MAP_FILE
#endif
#endif
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
#ifndef O_RDONLY
#define O_RDONLY 0
#endif
#define MAP_LEN 0x10000
main ()
{
#if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
char *p;
int dev_zero;
dev_zero = open ("/dev/zero", O_RDONLY);
if (dev_zero < 0)
exit (1);
p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
MAP_ANON|MAP_PRIVATE, dev_zero, 0);
if (p == (char *)-1)
exit (2);
else
{
char *string = "__si_type_info";
char *q = (char *) p + MAP_LEN - strlen (string) - 2;
char *r = (char *) p + 0xe;
strcpy (q, string);
strcpy (r, string);
strncmp (r, q, 14);
}
#endif /* HAVE_MMAP || HAVE_MMAP_ANYWHERE */
exit (0);
}
EOF
if { (eval echo configure:2891: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
then
ac_cv_func_strncmp_works=yes
else
echo "configure: failed program was:" >&5
cat conftest.$ac_ext >&5
rm -fr conftest*
ac_cv_func_strncmp_works=no
fi
rm -fr conftest*
fi
rm -f core core.* *.core
fi
echo "$ac_t""$ac_cv_func_strncmp_works" 1>&6
if test $ac_cv_func_strncmp_works = no ; then
LIBOBJS="$LIBOBJS strncmp.o"
fi
# Install a library built with a cross compiler in $(tooldir) rather
# than $(libdir).
if test -z "${with_cross_host}"; then

4
libiberty/configure.in
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@ -109,7 +109,7 @@ AC_SUBST_FILE(host_makefile_frag)
# It's OK to check for header files. Although the compiler may not be
# able to link anything, it had better be able to at least compile
# something.
AC_CHECK_HEADERS(sys/file.h sys/param.h stdlib.h string.h unistd.h strings.h sys/time.h sys/resource.h sys/stat.h)
AC_CHECK_HEADERS(sys/file.h sys/param.h stdlib.h string.h unistd.h strings.h sys/time.h sys/resource.h sys/stat.h sys/mman.h fcntl.h)
AC_HEADER_SYS_WAIT
# This is the list of functions which libiberty will provide if they
@ -352,6 +352,8 @@ EOF
AC_CHECK_FUNCS($checkfuncs)
fi
libiberty_AC_FUNC_STRNCMP
# Install a library built with a cross compiler in $(tooldir) rather
# than $(libdir).
if test -z "${with_cross_host}"; then

28
libiberty/strncmp.c Normal file
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@ -0,0 +1,28 @@
/* strncmp -- compare two strings, stop after n bytes.
This function is in the public domain. */
#include <ansidecl.h>
#ifdef __STDC__
#include <stddef.h>
#else
#define size_t unsigned long
#endif
int
strncmp(s1, s2, n)
const char *s1, *s2;
register size_t n;
{
register unsigned char u1, u2;
while (n-- > 0)
{
u1 = (unsigned char) *s1++;
u2 = (unsigned char) *s2++;
if (u1 != u2)
return u1 - u2;
if (u1 == '\0')
return 0;
}
return 0;
}