avoid some overlong lines from posix urls, etc.

[gnulib.git] / m4 / strcasestr.m4

diff --git a/m4/strcasestr.m4 b/m4/strcasestr.m4
index e1e5390..6e940bc 100644 (file)
--- a/m4/strcasestr.m4
+++ b/m4/strcasestr.m4
@@ -1,19 +1,28 @@
-# strcasestr.m4 serial 12
-dnl Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc.
+# strcasestr.m4 serial 13
+dnl Copyright (C) 2005, 2007, 2008, 2009, 2010 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.
 
-dnl Check that strcasestr is present.
+dnl Check that strcasestr is present and works.
 AC_DEFUN([gl_FUNC_STRCASESTR_SIMPLE],
 [
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+
   dnl Persuade glibc <string.h> to declare strcasestr().
   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
 
-  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
-  AC_REPLACE_FUNCS([strcasestr])
+  AC_REQUIRE([gl_FUNC_MEMCHR])
+  AC_CHECK_FUNCS([strcasestr])
   if test $ac_cv_func_strcasestr = no; then
     HAVE_STRCASESTR=0
+  else
+    if test "$gl_cv_func_memchr_works" != yes; then
+      REPLACE_STRCASESTR=1
+    fi
+  fi
+  if test $HAVE_STRCASESTR = 0 || test $REPLACE_STRCASESTR = 1; then
+    AC_LIBOBJ([strcasestr])
     gl_PREREQ_STRCASESTR
   fi
 ]) # gl_FUNC_STRCASESTR_SIMPLE
@@ -22,7 +31,7 @@ dnl Additionally, check that strcasestr is efficient.
 AC_DEFUN([gl_FUNC_STRCASESTR],
 [
   AC_REQUIRE([gl_FUNC_STRCASESTR_SIMPLE])
-  if test $ac_cv_func_strcasestr = yes; then
+  if test $HAVE_STRCASESTR = 1 && test $REPLACE_STRCASESTR = 0; then
     AC_CACHE_CHECK([whether strcasestr works in linear time],
       [gl_cv_func_strcasestr_linear],
       [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
@@ -41,20 +50,20 @@ AC_DEFUN([gl_FUNC_STRCASESTR],
     /* Check for quadratic performance.  */
     if (haystack && needle)
       {
-       memset (haystack, 'A', 2 * m);
-       haystack[2 * m] = 'B';
-       haystack[2 * m + 1] = 0;
-       memset (needle, 'A', m);
-       needle[m] = 'B';
-       needle[m + 1] = 0;
-       result = strcasestr (haystack, needle);
+        memset (haystack, 'A', 2 * m);
+        haystack[2 * m] = 'B';
+        haystack[2 * m + 1] = 0;
+        memset (needle, 'A', m);
+        needle[m] = 'B';
+        needle[m + 1] = 0;
+        result = strcasestr (haystack, needle);
       }
     return !result;]])],
-       [gl_cv_func_strcasestr_linear=yes], [gl_cv_func_strcasestr_linear=no],
+        [gl_cv_func_strcasestr_linear=yes], [gl_cv_func_strcasestr_linear=no],
         [dnl Only glibc >= 2.9 and cygwin >= 1.7.0 are known to have a
          dnl strcasestr that works in linear time.
-        AC_EGREP_CPP([Lucky user],
-          [
+         AC_EGREP_CPP([Lucky user],
+           [
 #include <features.h>
 #ifdef __GNU_LIBRARY__
  #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 9) || (__GLIBC__ > 2)
@@ -67,14 +76,15 @@ AC_DEFUN([gl_FUNC_STRCASESTR],
   Lucky user
  #endif
 #endif
-          ],
-          [gl_cv_func_strcasestr_linear=yes],
-          [gl_cv_func_strcasestr_linear="guessing no"])
-       ])
+           ],
+           [gl_cv_func_strcasestr_linear=yes],
+           [gl_cv_func_strcasestr_linear="guessing no"])
+        ])
       ])
     if test "$gl_cv_func_strcasestr_linear" != yes; then
       REPLACE_STRCASESTR=1
       AC_LIBOBJ([strcasestr])
+      gl_PREREQ_STRCASESTR
     fi
   fi
 ]) # gl_FUNC_STRCASESTR