Initial revision

1 files changed, 69 insertions, 0 deletions

diff --git a/string/strcoll.c b/string/strcoll.c
new file mode 100644
index 0000000000..0146aee780
--- /dev/null
+++ b/string/strcoll.c
@@ -0,0 +1,69 @@
+/* Copyright (C) 1991 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the GNU C Library; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <localeinfo.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+/* Compare S1 and S2, returning less than, equal to or
+   greater than zero if the collated form of S1 is lexiographically
+   less than, equal to or greater than the collated form of S2.  */
+int
+DEFUN(strcoll, (s1, s2), CONST char *s1 AND CONST char *s2)
+{
+  if (_collate_info == NULL || _collate_info->values == NULL)
+    return strcmp(s1, s2);
+  else
+    {
+      CONST unsigned char *CONST values = _collate_info->values;
+      CONST unsigned char *CONST offsets = _collate_info->offsets;
+
+      while (*s1 != '\0' && *s2 != '\0')
+	{
+	  CONST unsigned char c1 = *s1++, c2 = *s2++;
+	  CONST unsigned char v1 = values[c1], v2 = values[c2];
+	  CONST unsigned char o1 = offsets[c1], o2 = offsets[c2];
+
+	  if (v1 == UCHAR_MAX && o1 == 0)
+	    /* This is a non-collating element.  Skip it.  */
+	    --s2;
+	  else if (v2 == UCHAR_MAX && o2 == 0)
+	    --s1;
+	  else if (v1 == UCHAR_MAX && o1 == CHAR_MAX)
+	    {
+	      /* This element collates lower than anything else.  */
+	      if (v2 != UCHAR_MAX || o2 != CHAR_MAX)
+		return -1;
+	    }
+	  else if (v2 == UCHAR_MAX && o2 == CHAR_MAX)
+	    return 1;
+	  else if (v1 != v2)
+	    return v1 - v2;
+	  else if (o1 != o2)
+	    return o1 - o2;
+	}
+
+      if (*s1 == '\0')
+	return *s2 == '\0' ? 0 : -1;
+      else if (*s2 == '\0')
+	return 1;
+      return 0;
+    }
+}