# <rdar://problem/4497649> sync_with_stdio(false) causes cin input to be truncated early
--- gcc-4.0.0/libstdc++-v3/include/bits/fstream.tcc 2005-04-08 13:34:30.000000000 -0400
+++ libstdc++-v3/include/bits/fstream.tcc 2006-04-18 13:49:03.000000000 -0400
@@ -531,15 +531,8 @@ namespace std
const bool __testin = _M_mode & ios_base::in;
const streamsize __buflen = _M_buf_size > 1 ? _M_buf_size - 1 : 1;
-#if _GLIBCXX_HAVE_DOS_BASED_FILESYSTEM
- // About this workaround, see libstdc++/20806.
- const bool __testbinary = _M_mode & ios_base::binary;
- if (__n > __buflen && __check_facet(_M_codecvt).always_noconv()
- && __testin && __testbinary && !_M_writing)
-#else
if (__n > __buflen && __check_facet(_M_codecvt).always_noconv()
&& __testin && !_M_writing)
-#endif
{
// First, copy the chars already present in the buffer.
const streamsize __avail = this->egptr() - this->gptr();
@@ -555,13 +548,28 @@ namespace std
__n -= __avail;
}
- const streamsize __len = _M_file.xsgetn(reinterpret_cast<char*>(__s),
- __n);
- if (__len == -1)
- __throw_ios_failure(__N("basic_filebuf::xsgetn "
- "error reading the file"));
- __ret += __len;
- if (__len == __n)
+ // Need to loop in case of short reads (relatively common
+ // with pipes).
+ streamsize __len;
+ for (;;)
+ {
+ __len = _M_file.xsgetn(reinterpret_cast<char*>(__s),
+ __n);
+ if (__len == -1)
+ __throw_ios_failure(__N("basic_filebuf::xsgetn "
+ "error reading the file"));
+ if (__len == 0)
+ break;
+
+ __n -= __len;
+ __ret += __len;
+ if (__n == 0)
+ break;
+
+ __s += __len;
+ }
+
+ if (__n == 0)
{
_M_set_buffer(0);
_M_reading = true;