Complete eqn.7 parsing. Features all productions from the original 1975

CACM paper in an LR(1) parse (1 -> eqn_rewind()).  Right now the code is
a little jungly, but will clear up as I consolidate parse components.
The AST structure will also be cleaned up, as right now it's pretty ad
hoc (this won't change the parse itself).  I added the mandoc_strndup()
function will here.

1 files changed, 10 insertions, 0 deletions

diff --git a/mandoc.c b/mandoc.c
index 6d11e9b7..0f8e5394 100644
--- a/mandoc.c
+++ b/mandoc.c
@@ -432,6 +432,16 @@ mandoc_realloc(void *ptr, size_t size)
 	return(ptr);
 }
 
+char *
+mandoc_strndup(const char *ptr, size_t sz)
+{
+	char		*p;
+
+	p = mandoc_malloc(sz + 1);
+	memcpy(p, ptr, sz);
+	p[(int)sz] = '\0';
+	return(p);
+}
 
 char *
 mandoc_strdup(const char *ptr)