From 62fe47a33755719ab9c6e8c239e0dd01fc87e6f9 Mon Sep 17 00:00:00 2001
From: David Greene <greened@obbligato.org>
Date: Fri, 10 Jul 2009 21:14:44 +0000
Subject: Make changes suggested by Chris and eliminate newly-added raw_ostream
 hooks as they're no longer needed.

The major change with this patch is to make formatted_raw_ostream usable
by any client of raw_ostream.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75283 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Support/FormattedStream.cpp | 74 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 lib/Support/FormattedStream.cpp

(limited to 'lib/Support/FormattedStream.cpp')

diff --git a/lib/Support/FormattedStream.cpp b/lib/Support/FormattedStream.cpp
new file mode 100644
index 0000000000..d471d53df8
--- /dev/null
+++ b/lib/Support/FormattedStream.cpp
@@ -0,0 +1,74 @@
+//===-- llvm/CodeGen/AsmStream.cpp - AsmStream Framework --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains instantiations of "standard" AsmOStreams.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/FormattedStream.h"
+
+namespace llvm {
+  /// ComputeColumn - Examine the current output and figure out which
+  /// column we end up in after output.
+  ///
+  void formatted_raw_ostream::ComputeColumn(const char *Ptr, unsigned Size)
+  {
+    // Keep track of the current column by scanning the string for
+    // special characters
+
+    // Find the last newline.  This is our column start.  If there
+    // is no newline, start with the current column.
+    const char *nlpos = NULL;
+    for (const char *pos = Ptr + Size, *epos = Ptr; pos > epos; --pos) {
+      if (*(pos-1) == '\n') {
+        nlpos = pos-1;
+        // The newline will be counted, setting this to zero.  We
+        // need to do it this way in case nlpos is Ptr.
+        Column = -1;
+        break;
+      }
+    }
+
+    if (nlpos == NULL) {
+      nlpos = Ptr;
+    }
+
+    // Walk through looking for tabs and advance column as appropriate
+    for (const char *pos = nlpos, *epos = Ptr + Size; pos != epos; ++pos) {
+      ++Column;
+      if (*pos == '\t') {
+        // Advance to next tab stop (every eight characters)
+        Column += ((8 - (Column & 0x7)) & 0x7);
+        assert(!(Column & 0x3) && "Column out of alignment");
+      }
+    }
+  }
+
+  /// PadToColumn - Align the output to some column number
+  ///
+  /// \param NewCol - The column to move to
+  /// \param MinPad - The minimum space to give after the most recent
+  /// I/O, even if the current column + minpad > newcol
+  ///
+  void formatted_raw_ostream::PadToColumn(unsigned NewCol, unsigned MinPad) 
+  {
+    flush();
+
+    // Output spaces until we reach the desired column
+    unsigned num = NewCol - Column;
+    if (NewCol < Column || num < MinPad) {
+      num = MinPad;
+    }
+
+    // TODO: Write a whole string at a time
+    while (num-- > 0) {
+      write(' ');
+    }
+  }
+}
-- 
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