Bug 1197941 - Allow getline() to malloc its own buffer to avoid intermittent crashes, r=shu

--HG--
extra : commitid : 1uyyLvURamj
extra : rebase_source : 3bf604d75b79c81d75931701c50f9d4088e7d568

js/src/devtools/rootAnalysis/utility.js

@@ -158,21 +158,21 @@ function cLibrary()
         fopen: lib.declare("fopen", ctypes.default_abi, ctypes.void_t.ptr, ctypes.char.ptr, ctypes.char.ptr),
         getline: lib.declare("getline", ctypes.default_abi, ctypes.ssize_t, ctypes.char.ptr.ptr, ctypes.size_t.ptr, ctypes.void_t.ptr),
         fclose: lib.declare("fopen", ctypes.default_abi, ctypes.int, ctypes.void_t.ptr),
-        setvbuf: lib.declare("setvbuf", ctypes.default_abi, ctypes.int, ctypes.void_t.ptr, ctypes.char.ptr, ctypes.int, ctypes.size_t),
+        free: lib.declare("free", ctypes.default_abi, ctypes.void_t.ptr),
     };
 }
 
 function* readFileLines_gen(filename)
 {
-  var libc = cLibrary();
-  var linebuf = ctypes.char.array(4096)();
-  var bufsize = ctypes.size_t(4096);
-  var fp = libc.fopen(filename, "r");
-  if (fp.isNull())
-    throw "Unable to open '" + filename + "'"
+    var libc = cLibrary();
+    var linebuf = ctypes.char.ptr();
+    var bufsize = ctypes.size_t(0);
+    var fp = libc.fopen(filename, "r");
+    if (fp.isNull())
+        throw "Unable to open '" + filename + "'"
 
-  var bufp = ctypes.char.ptr(linebuf.addressOfElement(0));
-  while (libc.getline(bufp.address(), bufsize.address(), fp) > 0)
-    yield bufp.readString();
-  libc.fclose(fp);
+    while (libc.getline(linebuf.address(), bufsize.address(), fp) > 0)
+        yield linebuf.readString();
+    libc.fclose(fp);
+    libc.free(ctypes.void_t.ptr(linebuf));
 }