Handle UIDs and GIDs that don't fit in 6 decimal places.

Newer unix systems have 32 bit uid and gid types, but the archive format was
not updated. Fortunately, these fields are not normally used. Just truncate
the data to fit in 6 chars.

llvm-svn: 199223

1 files changed, 14 insertions, 7 deletions

diff --git a/llvm/tools/llvm-ar/llvm-ar.cpp b/llvm/tools/llvm-ar/llvm-ar.cpp
index d70db728f2d..8091e3511fb 100644
--- a/llvm/tools/llvm-ar/llvm-ar.cpp
+++ b/llvm/tools/llvm-ar/llvm-ar.cpp
@@ -578,14 +578,21 @@ computeNewArchiveMembers(ArchiveOperation Operation,
 }
 
 template <typename T>
-static void printWithSpacePadding(raw_ostream &OS, T Data, unsigned Size) {
+static void printWithSpacePadding(raw_fd_ostream &OS, T Data, unsigned Size,
+				  bool MayTruncate = false) {
   uint64_t OldPos = OS.tell();
   OS << Data;
   unsigned SizeSoFar = OS.tell() - OldPos;
-  assert(Size >= SizeSoFar && "Data doesn't fit in Size");
-  unsigned Remaining = Size - SizeSoFar;
-  for (unsigned I = 0; I < Remaining; ++I)
-    OS << ' ';
+  if (Size > SizeSoFar) {
+    unsigned Remaining = Size - SizeSoFar;
+    for (unsigned I = 0; I < Remaining; ++I)
+      OS << ' ';
+  } else if (Size < SizeSoFar) {
+    assert(MayTruncate && "Data doesn't fit in Size");
+    // Some of the data this is used for (like UID) can be larger than the
+    // space available in the archive format. Truncate in that case.
+    OS.seek(OldPos + Size);
+  }
 }
 
 static void print32BE(raw_fd_ostream &Out, unsigned Val) {
@@ -600,8 +607,8 @@ static void printRestOfMemberHeader(raw_fd_ostream &Out,
                                     unsigned GID, unsigned Perms,
                                     unsigned Size) {
   printWithSpacePadding(Out, ModTime.toEpochTime(), 12);
-  printWithSpacePadding(Out, UID, 6);
-  printWithSpacePadding(Out, GID, 6);
+  printWithSpacePadding(Out, UID, 6, true);
+  printWithSpacePadding(Out, GID, 6, true);
   printWithSpacePadding(Out, format("%o", Perms), 8);
   printWithSpacePadding(Out, Size, 10);
   Out << "`\n";