+ const struct function *f;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(function_table); i++) {
+ f = &function_table[i];
+ if (strcmp(f->name, name))
+ continue;
+
+ if (argc < f->min_args)
+ pperror("too few function arguments passed to '%s'",
+ name);
+
+ if (argc > f->max_args)
+ pperror("too many function arguments passed to '%s'",
+ name);
+
+ return f->func(argc, argv);
+ }
+
+ return NULL;
+}
+
+/*
+ * Evaluate a clause with arguments. argc/argv are arguments from the upper
+ * function call.
+ *
+ * Returned string must be freed when done
+ */
+static char *eval_clause(const char *str, size_t len, int argc, char *argv[])
+{
+ char *tmp, *name, *res, *prev, *p;
+ int new_argc = 0;
+ char *new_argv[FUNCTION_MAX_ARGS];
+ int nest = 0;
+ int i;