io: add FILE slurp overload

io.cpp

@@ -72,6 +72,33 @@ util::slurp (const boost::filesystem::path& path)  {
 }
 
 
+//-----------------------------------------------------------------------------
+std::vector<char>
+util::slurp (FILE *stream)
+{
+    std::vector<char> data;
+    data.resize (16);
+
+    for (size_t chunk = 0, size = data.size ();
+         !ferror (stream) && !feof (stream);
+         chunk = size, size *= 2u)
+    {
+        auto found = fread (data.data () + chunk, 1, chunk, stream);
+        if (found != chunk)
+            break;
+
+        data.resize (data.size () * 2u);
+    }
+
+    if (ferror (stream))
+        errno_error::throw_code ();
+
+    CHECK (feof (stream));
+    return data;
+}
+
+
+
 //-----------------------------------------------------------------------------
 void
 util::write (const fd &out,

io.hpp

@@ -70,10 +70,12 @@ namespace util {
 
     /// Reads an entire file into memory. Caller frees the result. Guarantees a
     /// null trailing byte.
-    std::vector<char>
-    slurp [[gnu::warn_unused_result]] (const boost::filesystem::path&);
+    std::vector<char> slurp (const boost::filesystem::path&);
+
+    std::vector<char> slurp (FILE *);
 
 
+    //-------------------------------------------------------------------------
     void write (const fd&, const void *restrict data, size_t bytes);
 
     template <typename T>