add return value check of fseek

55b6ef43 · Akira Yumiyama · 14e1992e · 55b6ef43
Commit 55b6ef43 authored May 12, 2013 by Akira Yumiyama
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src/file.c src/file.c +4 -1

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--- a/src/file.c
+++ b/src/file.c
@@ -200,7 +200,10 @@ mrb_file_size(mrb_state *mrb, mrb_value klass)
    return mrb_nil_value();
  }
-  fseek(fp, 0, SEEK_END);
+  if (fseek(fp, 0, SEEK_END) != 0) {
+    mrb_sys_fail(mrb, "mrb_file_size failed.");
+    return mrb_nil_value();
+  }
  filesize = (mrb_int) ftell(fp);
  fclose(fp);