Added cmark_ctype.h with locale-independent isspace, ispunct, etc.

Otherwise cmark's behavior varies unpredictably with the locale.

`is_punctuation` in utf8.h has also been adjusted so that everything
that counts all ASCII symbol characters count as punctuation, even
though some are not in P* character classes.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/cmark_ctype.h b/src/cmark_ctype.h
new file mode 100644
index 0000000..afc605e
--- /dev/null
+++ b/src/cmark_ctype.h
@@ -0,0 +1,11 @@
+/** Locale-independent versions of functions from ctype.h.
+ * We want cmark to behave the same no matter what the system locale.
+ */
+
+int isspace(char c);
+
+int ispunct(char c);
+
+int isalnum(char c);
+
+int isdigit(char c);