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factoring out startup routine for embedded use

--- a/femtolisp/flisp.c

+++ b/femtolisp/flisp.c

@@ -2258,7 +2258,7 @@

 extern value_t fl_file(value_t *args, uint32_t nargs);

-int main(int argc, char *argv[])

+int fl_startup()

 {

     value_t e;

     int saveSP;

@@ -2303,17 +2303,31 @@

         }

         ios_close(value2c(ios_t*,Stack[SP-1]));

         POPN(1);

+    }

+    FL_CATCH {

+        ios_puts("fatal error during bootstrap:\n", ios_stderr);

+        fl_print(ios_stderr, lasterror);

+        ios_putc('\n', ios_stderr);

+        return 1;

+    }

+    return 0;

+}

+int main(int argc, char *argv[])

+{

+    if (fl_startup())

+        return 1;

+

+    FL_TRY {

         PUSH(symbol_value(symbol("__start")));

         PUSH(argv_list(argc, argv));

         (void)_applyn(1);

     }

     FL_CATCH {

-        ios_puts("fatal error during bootstrap:\n", ios_stderr);

+        ios_puts("fatal error:\n", ios_stderr);

         fl_print(ios_stderr, lasterror);

         ios_putc('\n', ios_stderr);

         return 1;

     }

-

     return 0;

 }

--- a/femtolisp/flisp.h

+++ b/femtolisp/flisp.h

@@ -322,4 +322,6 @@

 value_t cvalue_byte(value_t *args, uint32_t nargs);

 value_t cvalue_wchar(value_t *args, uint32_t nargs);

+int fl_startup();

+

 #endif

-- 

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