+# Indent only with spaces.
+# Taken from Coreutils.
+sc_prohibit_tab_based_indentation:
+ @prohibit='^ * ' \
+ halt='TAB in indentation; use only spaces' \
+ $(_sc_search_regexp)
+
+# Prohibit the use of `...` in tests/. Use $(...) instead.
+# Taken from Coreutils.
+# Not ready for Bison yet.
+#sc_prohibit_test_backticks:
+# @prohibit='`' in_vc_files='^tests/' \
+# halt='use $$(...), not `...` in tests/' \
+# $(_sc_search_regexp)
+
+# Enforce recommended preprocessor indentation style.
+# Taken from Coreutils.
+sc_preprocessor_indentation:
+ @if cppi --version >/dev/null 2>&1; then \
+ $(VC_LIST_EXCEPT) | grep '\.[ch]$$' | xargs cppi -a -c \
+ || { echo '$(ME): incorrect preprocessor indentation' 1>&2; \
+ exit 1; }; \
+ else \
+ echo '$(ME): skipping test $@: cppi not installed' 1>&2; \
+ fi
+
+###########################################################
+# Taken from Coreutils.
+_p0 = \([^"'/]\|"\([^\"]\|[\].\)*"\|'\([^\']\|[\].\)*'
+_pre = $(_p0)\|[/][^"'/*]\|[/]"\([^\"]\|[\].\)*"\|[/]'\([^\']\|[\].\)*'\)*
+_pre_anchored = ^\($(_pre)\)
+_comment_and_close = [^*]\|[*][^/*]\)*[*][*]*/
+# help font-lock mode: '
+
+# A sed expression that removes ANSI C and ISO C99 comments.
+# Derived from the one in GNU gettext's 'moopp' preprocessor.
+_sed_remove_comments = \
+/[/][/*]/{ \
+ ta; \
+ :a; \
+ s,$(_pre_anchored)//.*,\1,; \
+ te; \
+ s,$(_pre_anchored)/[*]\($(_comment_and_close),\1 ,; \
+ ta; \
+ /^$(_pre)[/][*]/{ \
+ s,$(_pre_anchored)/[*].*,\1 ,; \
+ tu; \
+ :u; \
+ n; \
+ s,^\($(_comment_and_close),,; \
+ tv; \
+ s,^.*$$,,; \
+ bu; \
+ :v; \
+ }; \
+ :e; \
+}
+# Quote all single quotes.
+_sed_rm_comments_q = $(subst ','\'',$(_sed_remove_comments))
+# help font-lock mode: '
+
+_space_before_paren_exempt =? \\n\\$$
+_space_before_paren_exempt = \
+ (^ *\#|(LA)?LR\([01]\)|percent_(code|define)|b4_syncline|m4_(define|init)|symbol)
+# Ensure that there is a space before each open parenthesis in C code.
+sc_space_before_open_paren:
+ @if $(VC_LIST_EXCEPT) | grep -l '\.[ch]$$' > /dev/null; then \
+ fail=0; \
+ for c in $$($(VC_LIST_EXCEPT) | grep '\.[ch]$$'); do \
+ sed '$(_sed_rm_comments_q)' $$c 2>/dev/null \
+ | grep -i '[[:alnum:]](' \
+ | grep -vE '$(_space_before_paren_exempt)' \
+ | grep . && { fail=1; echo "*** $$c"; }; \
+ done; \
+ test $$fail = 1 && \
+ { echo '$(ME): the above files lack a space-before-open-paren' \
+ 1>&2; exit 1; } || :; \
+ else :; \
+ fi
+
+## -------------------------- ##
+## syntax-checks exceptions. ##
+## -------------------------- ##
+