vendor/dma/20140213

1 files changed, 112 insertions, 0 deletions

diff --git a/aliases_parse.y b/aliases_parse.y
new file mode 100644
index 0000000000000..a5a9e7b32f071
--- /dev/null
+++ b/aliases_parse.y
@@ -0,0 +1,112 @@
+%{
+
+#include <err.h>
+#include <string.h>
+#include <syslog.h>
+#include "dma.h"
+
+extern int yylineno;
+static void yyerror(const char *);
+int yywrap(void);
+int yylex(void);
+
+static void
+yyerror(const char *msg)
+{
+	/**
+	 * Because we do error '\n' below, we need to report the error
+	 * one line above of what yylineno points to.
+	 */
+	syslog(LOG_CRIT, "aliases line %d: %s", yylineno - 1, msg);
+	fprintf(stderr, "aliases line %d: %s\n", yylineno - 1, msg);
+}
+
+int
+yywrap(void)
+{
+	return (1);
+}
+
+%}
+
+%union {
+	char *ident;
+	struct stritem *strit;
+	struct alias *alias;
+}
+
+%token <ident> T_IDENT
+%token T_ERROR
+%token T_EOF 0
+
+%type <strit> dests
+%type <alias> alias aliases
+
+%%
+
+start	: aliases T_EOF
+		{
+			LIST_FIRST(&aliases) = $1;
+		}
+
+aliases	: /* EMPTY */
+		{
+			$$ = NULL;
+		}
+	| alias aliases
+		{
+			if ($2 != NULL && $1 != NULL)
+				LIST_INSERT_AFTER($2, $1, next);
+			else if ($2 == NULL)
+				$2 = $1;
+			$$ = $2;
+		}
+       	;
+
+alias	: T_IDENT ':' dests '\n'
+		{
+			struct alias *al;
+
+			if ($1 == NULL)
+				YYABORT;
+			al = calloc(1, sizeof(*al));
+			if (al == NULL)
+				YYABORT;
+			al->alias = $1;
+			SLIST_FIRST(&al->dests) = $3;
+			$$ = al;
+		}
+	| error '\n'
+		{
+			YYABORT;
+		}
+     	;
+
+dests	: T_IDENT
+		{
+			struct stritem *it;
+
+			if ($1 == NULL)
+				YYABORT;
+			it = calloc(1, sizeof(*it));
+			if (it == NULL)
+				YYABORT;
+			it->str = $1;
+			$$ = it;
+		}
+	| T_IDENT ',' dests
+		{
+			struct stritem *it;
+
+			if ($1 == NULL)
+				YYABORT;
+			it = calloc(1, sizeof(*it));
+			if (it == NULL)
+				YYABORT;
+			it->str = $1;
+			SLIST_NEXT(it, next) = $3;
+			$$ = it;
+		}
+	;
+
+%%