Implement a simpler direct API for getting and setting numeric values in

the SQL database. This is mostly because the lack of string handling makes
manipulation of queries difficult.

src/lsi/abi.h

@@ -51,3 +51,5 @@ int vm_intfn_cmdsocket_write(void);
 int vm_intfn_cmdsocket_prefix(void);
 int vm_intfn_sql_query(void);
 int vm_intfn_sql_query_1s(void);
+int vm_intfn_sql_getvar(void);
+int vm_intfn_sql_setvar(void);

src/lsi/abispec

@@ -41,6 +41,8 @@ function cmdsocket_prefix
 /* NOT_YET function_v sql_query */
 function sql_query
 function sql_query_1s
+function sql_getvar
+function sql_setvar
 
 /*
  * The ABI should be identified by a SHA1 hash of this file

src/lsi/vm.c

@@ -596,6 +596,55 @@ int vm_intfn_sql_query_1s(void)
 	stack_poke(vm_current, 0, result); /* return value */
 	return 1;
 }
+
+int vm_intfn_sql_getvar(void)
+{
+	int len;
+	char buf[VM_STRING_MAX];
+	char query[VM_STRING_MAX];
+	int result;
+
+	len = stack_get(vm_current, 1);
+
+	if (len >= VM_STRING_MAX) {
+		printf("Excessive string length - can't perform query\n");
+		return 1;
+	}
+
+	snprintf(buf, len+1, stack_getstr(vm_current, len, 1));
+	snprintf(query, VM_STRING_MAX, "SELECT value FROM vars WHERE name=\"%s\"", buf);
+
+	sql_query(query, strlen(query), &result);
+
+	/* XXX what to do with an error here? */
+	stack_poke(vm_current, 0, result); /* return value */
+	return 1;
+}
+
+int vm_intfn_sql_setvar(void)
+{
+	int len, val;
+	char buf[VM_STRING_MAX];
+	char query[VM_STRING_MAX];
+	int result;
+
+	val = stack_get(vm_current, 1);
+	len = stack_get(vm_current, 2);
+
+	if (len >= VM_STRING_MAX) {
+		printf("Excessive string length - can't perform query\n");
+		return 1;
+	}
+
+	snprintf(buf, len+1, stack_getstr(vm_current, len, 2));
+	snprintf(query, VM_STRING_MAX, "INSERT OR REPLACE INTO vars VALUES(\"%s\", %d)", buf, val);
+
+	sql_query(query, strlen(query), &result);
+
+	/* XXX what to do with an error here? */
+	stack_poke(vm_current, 0, result); /* return value */
+	return 1;
+}
 #endif
 
 int vm_intfn_beatdetect_read(void)