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# AST_PROG_SED
# -----------
# Check for a fully functional sed program that truncates
# as few characters as possible. Prefer GNU sed if found.
AC_DEFUN([AST_PROG_SED],
[AC_CACHE_CHECK([for a sed that does not truncate output], ac_cv_path_SED,
[dnl ac_script should not contain more than 99 commands (for HP-UX sed),
dnl but more than about 7000 bytes, to catch a limit in Solaris 8 /usr/ucb/sed.
ac_script=s/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/
for ac_i in 1 2 3 4 5 6 7; do
ac_script="$ac_script$as_nl$ac_script"
done
echo "$ac_script" | sed 99q >conftest.sed
$as_unset ac_script || ac_script=
ifdef([_AC_PATH_PROGS_FEATURE_CHECK], [_AC_PATH_PROGS_FEATURE_CHECK], [_AC_PATH_PROG_FEATURE_CHECK])(SED, [sed gsed],
[_AC_FEATURE_CHECK_LENGTH([ac_path_SED], [ac_cv_path_SED],
["$ac_path_SED" -f conftest.sed])])])
SED="$ac_cv_path_SED"
AC_SUBST([SED])dnl
rm -f conftest.sed
])# AST_PROG_SED
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