Use do_run_from_file() for test_longjmp_stacked

tests/core/test_longjmp_stacked.in

@@ -0,0 +1,44 @@
+
+        #include <stdio.h>
+        #include <setjmp.h>
+        #include <stdlib.h>
+        #include <string.h>
+
+        int bottom, top;
+
+        int run(int y) {
+          // confuse stack
+          char *s = (char*)alloca(100);
+          memset(s, 1, 100);
+          s[y] = y;
+          s[y/2] = y*2;
+          volatile int x = s[y];
+          top = (int)alloca(4);
+          if (x <= 2) return x;
+          jmp_buf buf;
+          printf("setjmp of %d\n", x);
+          if (setjmp(buf) == 0) {
+            printf("going\n");
+            x += run(x/2);
+            longjmp(buf, 1);
+          }
+          printf("back\n");
+          return x/2;
+        }
+
+        int main(int argc, char **argv) {
+          int sum = 0;
+          for (int i = 0; i < argc*2; i++) {
+            bottom = (int)alloca(4);
+            sum += run(10);
+            // scorch the earth
+            if (bottom < top) {
+              memset((void*)bottom, 1, top - bottom);
+            } else {
+              memset((void*)top, 1, bottom - top);
+            }
+          }
+          printf("%d\n", sum);
+          return sum;
+        }
+      

tests/core/test_longjmp_stacked.out

@@ -0,0 +1,13 @@
+setjmp of 10
+going
+setjmp of 5
+going
+back
+back
+setjmp of 10
+going
+setjmp of 5
+going
+back
+back
+12

tests/test_core.py

@@ -1124,64 +1124,11 @@ class T(RunnerCore): # Short name, to make it more fun to use manually on the co
       self.do_run_from_file(src, output)
 
   def test_longjmp_stacked(self):
-      src = r'''
-        #include <stdio.h>
-        #include <setjmp.h>
-        #include <stdlib.h>
-        #include <string.h>
+    test_path = path_from_root('tests', 'core', 'test_longjmp_stacked')
+    src, output = (test_path + s for s in ('.in', '.out'))
 
-        int bottom, top;
+    self.do_run_from_file(src, output)
 
-        int run(int y) {
-          // confuse stack
-          char *s = (char*)alloca(100);
-          memset(s, 1, 100);
-          s[y] = y;
-          s[y/2] = y*2;
-          volatile int x = s[y];
-          top = (int)alloca(4);
-          if (x <= 2) return x;
-          jmp_buf buf;
-          printf("setjmp of %d\n", x);
-          if (setjmp(buf) == 0) {
-            printf("going\n");
-            x += run(x/2);
-            longjmp(buf, 1);
-          }
-          printf("back\n");
-          return x/2;
-        }
-
-        int main(int argc, char **argv) {
-          int sum = 0;
-          for (int i = 0; i < argc*2; i++) {
-            bottom = (int)alloca(4);
-            sum += run(10);
-            // scorch the earth
-            if (bottom < top) {
-              memset((void*)bottom, 1, top - bottom);
-            } else {
-              memset((void*)top, 1, bottom - top);
-            }
-          }
-          printf("%d\n", sum);
-          return sum;
-        }
-      '''
-      self.do_run(src, '''setjmp of 10
-going
-setjmp of 5
-going
-back
-back
-setjmp of 10
-going
-setjmp of 5
-going
-back
-back
-12
-''')
 
   def test_longjmp_exc(self):
     src = r'''