1 files changed, 108 insertions, 0 deletions
diff --git a/subversion/libsvn_subr/eol.c b/subversion/libsvn_subr/eol.c
new file mode 100644
index 0000000..88a6a37
--- /dev/null
+++ b/subversion/libsvn_subr/eol.c
@@ -0,0 +1,108 @@
+/*
+ * eol.c :  generic eol/keyword routines
+ *
+ * ====================================================================
+ *    Licensed to the Apache Software Foundation (ASF) under one
+ *    or more contributor license agreements.  See the NOTICE file
+ *    distributed with this work for additional information
+ *    regarding copyright ownership.  The ASF licenses this file
+ *    to you under the Apache License, Version 2.0 (the
+ *    "License"); you may not use this file except in compliance
+ *    with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing,
+ *    software distributed under the License is distributed on an
+ *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *    KIND, either express or implied.  See the License for the
+ *    specific language governing permissions and limitations
+ *    under the License.
+ * ====================================================================
+ */
+
+
+
+#define APR_WANT_STRFUNC
+
+#include <apr_file_io.h>
+#include "svn_io.h"
+#include "private/svn_eol_private.h"
+#include "private/svn_dep_compat.h"
+
+/* Machine-word-sized masks used in svn_eol__find_eol_start.
+ */
+char *
+svn_eol__find_eol_start(char *buf, apr_size_t len)
+{
+#if !SVN_UNALIGNED_ACCESS_IS_OK
+
+  /* On some systems, we need to make sure that buf is properly aligned
+   * for chunky data access. This overhead is still justified because
+   * only lines tend to be tens of chars long.
+   */
+  for (; (len > 0) && ((apr_uintptr_t)buf) & (sizeof(apr_uintptr_t)-1)
+       ; ++buf, --len)
+  {
+    if (*buf == '\n' || *buf == '\r')
+      return buf;
+  }
+
+#endif
+
+  /* Scan the input one machine word at a time. */
+  for (; len > sizeof(apr_uintptr_t)
+       ; buf += sizeof(apr_uintptr_t), len -= sizeof(apr_uintptr_t))
+  {
+    /* This is a variant of the well-known strlen test: */
+    apr_uintptr_t chunk = *(const apr_uintptr_t *)buf;
+
+    /* A byte in SVN__R_TEST is \0, iff it was \r in *BUF.
+     * Similarly, SVN__N_TEST is an indicator for \n. */
+    apr_uintptr_t r_test = chunk ^ SVN__R_MASK;
+    apr_uintptr_t n_test = chunk ^ SVN__N_MASK;
+
+    /* A byte in SVN__R_TEST can by < 0x80, iff it has been \0 before
+     * (i.e. \r in *BUF). Dito for SVN__N_TEST. */
+    r_test |= (r_test & SVN__LOWER_7BITS_SET) + SVN__LOWER_7BITS_SET;
+    n_test |= (n_test & SVN__LOWER_7BITS_SET) + SVN__LOWER_7BITS_SET;
+
+    /* Check whether at least one of the words contains a byte <0x80
+     * (if one is detected, there was a \r or \n in CHUNK). */
+    if ((r_test & n_test & SVN__BIT_7_SET) != SVN__BIT_7_SET)
+      break;
+  }
+
+  /* The remaining odd bytes will be examined the naive way: */
+  for (; len > 0; ++buf, --len)
+    {
+      if (*buf == '\n' || *buf == '\r')
+        return buf;
+    }
+
+  return NULL;
+}
+
+const char *
+svn_eol__detect_eol(char *buf, apr_size_t len, char **eolp)
+{
+  char *eol;
+
+  eol = svn_eol__find_eol_start(buf, len);
+  if (eol)
+    {
+      if (eolp)
+        *eolp = eol;
+
+      if (*eol == '\n')
+        return "\n";
+
+      /* We found a CR. */
+      ++eol;
+      if (eol == buf + len || *eol != '\n')
+        return "\r";
+      return "\r\n";
+    }
+
+  return NULL;
+}