(initbuf): If the desired size cannot be

allocated, repeatedly halve it until allocation succeeds.

1 files changed, 14 insertions, 3 deletions

diff --git a/src/sort.c b/src/sort.c
index 952bfe8aa..d6b46f5df 100644
--- a/src/sort.c
+++ b/src/sort.c
@@ -698,12 +698,23 @@ sort_buffer_size (FILE *const *fps, int nfps,
 static void
 initbuf (struct buffer *buf, size_t line_bytes, size_t alloc)
 {
-  /* Ensure that the line array is properly aligned.  */
-  alloc += sizeof (struct line) - alloc % sizeof (struct line);
+  /* Ensure that the line array is properly aligned.  If the desired
+     size cannot be allocated, repeatedly halve it until allocation
+     succeeds.  The smaller allocation may hurt overall performance,
+     but that's better than failing.  */
+  for (;;)
+    {
+      alloc += sizeof (struct line) - alloc % sizeof (struct line);
+      buf->buf = malloc (alloc);
+      if (buf->buf)
+	break;
+      alloc /= 2;
+      if (alloc <= line_bytes + 1)
+	xalloc_die ();
+    }
 
   buf->line_bytes = line_bytes;
   buf->alloc = alloc;
-  buf->buf = xmalloc (buf->alloc);
   buf->used = buf->left = buf->nlines = 0;
   buf->eof = 0;
 }