X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=m4%2Fmemchr.m4;fp=m4%2Fmemchr.m4;h=1194bac2e81dbadeb030ed946d00f2304bd000c0;hb=c7e61475680fa226bd9b8bdd469cd66914e630f5;hp=0000000000000000000000000000000000000000;hpb=800deb09b422a73c1212233a93839a223ff59678;p=debian%2Fgzip

diff --git a/m4/memchr.m4 b/m4/memchr.m4
new file mode 100644
index 0000000..1194bac
--- /dev/null
+++ b/m4/memchr.m4
@@ -0,0 +1,86 @@
+# memchr.m4 serial 7
+dnl Copyright (C) 2002, 2003, 2004, 2009 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN_ONCE([gl_FUNC_MEMCHR],
+[
+  dnl Check for prerequisites for memory fence checks.
+  gl_FUNC_MMAP_ANON
+  AC_CHECK_HEADERS_ONCE([sys/mman.h])
+  AC_CHECK_FUNCS_ONCE([mprotect])
+
+  dnl These days, we assume memchr is present.  But just in case...
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_REPLACE_FUNCS([memchr])
+  if test $ac_cv_func_memchr = no; then
+    gl_PREREQ_MEMCHR
+    REPLACE_MEMCHR=1
+  fi
+
+  if test $ac_cv_func_memchr = yes; then
+    # Detect platform-specific bugs in some versions of glibc:
+    # memchr should not dereference anything with length 0
+    #   http://bugzilla.redhat.com/499689
+    # memchr should not dereference overestimated length after a match
+    #   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521737
+    #   http://sourceware.org/bugzilla/show_bug.cgi?id=10162
+    # Assume that memchr works on platforms that lack mprotect.
+    AC_CACHE_CHECK([whether memchr works], [gl_cv_func_memchr_works],
+      [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <string.h>
+#if HAVE_SYS_MMAN_H
+# include <fcntl.h>
+# include <unistd.h>
+# include <sys/types.h>
+# include <sys/mman.h>
+# ifndef MAP_FILE
+#  define MAP_FILE 0
+# endif
+#endif
+]], [[
+  char *fence = NULL;
+#if HAVE_SYS_MMAN_H && HAVE_MPROTECT
+# if HAVE_MAP_ANONYMOUS
+  const int flags = MAP_ANONYMOUS | MAP_PRIVATE;
+  const int fd = -1;
+# else /* !HAVE_MAP_ANONYMOUS */
+  const int flags = MAP_FILE | MAP_PRIVATE;
+  int fd = open ("/dev/zero", O_RDONLY, 0666);
+  if (fd >= 0)
+# endif
+    {
+      int pagesize = getpagesize ();
+      char *two_pages =
+	(char *) mmap (NULL, 2 * pagesize, PROT_READ | PROT_WRITE,
+		       flags, fd, 0);
+      if (two_pages != (char *)(-1)
+	  && mprotect (two_pages + pagesize, pagesize, PROT_NONE) == 0)
+	fence = two_pages + pagesize;
+    }
+#endif
+  if (fence)
+    {
+      if (memchr (fence, 0, 0))
+        return 1;
+      strcpy (fence - 9, "12345678");
+      if (memchr (fence - 9, 0, 79) != fence - 1)
+        return 2;
+    }
+  return 0;
+]])], [gl_cv_func_memchr_works=yes], [gl_cv_func_memchr_works=no],
+      [dnl Be pessimistic for now.
+       gl_cv_func_memchr_works="guessing no"])])
+    if test "$gl_cv_func_memchr_works" != yes; then
+      gl_PREREQ_MEMCHR
+      REPLACE_MEMCHR=1
+      AC_LIBOBJ([memchr])
+    fi
+  fi
+])
+
+# Prerequisites of lib/memchr.c.
+AC_DEFUN([gl_PREREQ_MEMCHR], [
+  AC_CHECK_HEADERS([bp-sym.h])
+])