Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 201 insertions, 0 deletions

diff --git a/REORG.TODO/stdlib/grouping.c b/REORG.TODO/stdlib/grouping.c
new file mode 100644
index 0000000000..63ef4c1644
--- /dev/null
+++ b/REORG.TODO/stdlib/grouping.c
@@ -0,0 +1,201 @@
+/* Internal header for proving correct grouping in strings of numbers.
+   Copyright (C) 1995-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <limits.h>
+#include <stddef.h>
+#include <string.h>
+
+#ifndef MAX
+#define MAX(a,b)	({ typeof(a) _a = (a); typeof(b) _b = (b); \
+			   _a > _b ? _a : _b; })
+#endif
+
+#ifdef USE_WIDE_CHAR
+# include <wctype.h>
+# define L_(Ch) L##Ch
+# define UCHAR_TYPE wint_t
+# define STRING_TYPE wchar_t
+#else
+# define L_(Ch) Ch
+# define UCHAR_TYPE unsigned char
+# define STRING_TYPE char
+#endif
+
+#include "grouping.h"
+
+/* Find the maximum prefix of the string between BEGIN and END which
+   satisfies the grouping rules.  It is assumed that at least one digit
+   follows BEGIN directly.  */
+
+const STRING_TYPE *
+#ifdef USE_WIDE_CHAR
+__correctly_grouped_prefixwc (const STRING_TYPE *begin, const STRING_TYPE *end,
+			      wchar_t thousands,
+#else
+__correctly_grouped_prefixmb (const STRING_TYPE *begin, const STRING_TYPE *end,
+			      const char *thousands,
+#endif
+			      const char *grouping)
+{
+#ifndef USE_WIDE_CHAR
+  size_t thousands_len;
+  int cnt;
+#endif
+
+  if (grouping == NULL)
+    return end;
+
+#ifndef USE_WIDE_CHAR
+  thousands_len = strlen (thousands);
+#endif
+
+  while (end > begin)
+    {
+      const STRING_TYPE *cp = end - 1;
+      const char *gp = grouping;
+
+      /* Check first group.  */
+      while (cp >= begin)
+	{
+#ifdef USE_WIDE_CHAR
+	  if (*cp == thousands)
+	    break;
+#else
+	  if (cp[thousands_len - 1] == *thousands)
+	    {
+	      for (cnt = 1; thousands[cnt] != '\0'; ++cnt)
+		if (thousands[cnt] != cp[thousands_len - 1 - cnt])
+		  break;
+	      if (thousands[cnt] == '\0')
+		break;
+	    }
+#endif
+	  --cp;
+	}
+
+      /* We allow the representation to contain no grouping at all even if
+	 the locale specifies we can have grouping.  */
+      if (cp < begin)
+	return end;
+
+      if (end - cp == (int) *gp + 1)
+	{
+	  /* This group matches the specification.  */
+
+	  const STRING_TYPE *new_end;
+
+	  if (cp < begin)
+	    /* There is just one complete group.  We are done.  */
+	    return end;
+
+	  /* CP points to a thousands separator character.  The preceding
+	     remainder of the string from BEGIN to NEW_END is the part we
+	     will consider if there is a grouping error in this trailing
+	     portion from CP to END.  */
+	  new_end = cp - 1;
+
+	  /* Loop while the grouping is correct.  */
+	  while (1)
+	    {
+	      /* Get the next grouping rule.  */
+	      ++gp;
+	      if (*gp == 0)
+		/* If end is reached use last rule.  */
+	        --gp;
+
+	      /* Skip the thousands separator.  */
+	      --cp;
+
+	      if (*gp == CHAR_MAX
+#if CHAR_MIN < 0
+		  || *gp < 0
+#endif
+		  )
+	        {
+	          /* No more thousands separators are allowed to follow.  */
+	          while (cp >= begin)
+		    {
+#ifdef USE_WIDE_CHAR
+		      if (*cp == thousands)
+			break;
+#else
+		      for (cnt = 0; thousands[cnt] != '\0'; ++cnt)
+			if (thousands[cnt] != cp[thousands_len - cnt - 1])
+			  break;
+		      if (thousands[cnt] == '\0')
+			break;
+#endif
+		      --cp;
+		    }
+
+	          if (cp < begin)
+		    /* OK, only digits followed.  */
+		    return end;
+	        }
+	      else
+	        {
+		  /* Check the next group.  */
+	          const STRING_TYPE *group_end = cp;
+
+		  while (cp >= begin)
+		    {
+#ifdef USE_WIDE_CHAR
+		      if (*cp == thousands)
+			break;
+#else
+		      for (cnt = 0; thousands[cnt] != '\0'; ++cnt)
+			if (thousands[cnt] != cp[thousands_len - cnt - 1])
+			  break;
+		      if (thousands[cnt] == '\0')
+			break;
+#endif
+		      --cp;
+		    }
+
+		  if (cp < begin && group_end - cp <= (int) *gp)
+		    /* Final group is correct.  */
+		    return end;
+
+		  if (cp < begin || group_end - cp != (int) *gp)
+		    /* Incorrect group.  Punt.  */
+		    break;
+		}
+	    }
+
+	  /* The trailing portion of the string starting at NEW_END
+	     contains a grouping error.  So we will look for a correctly
+	     grouped number in the preceding portion instead.  */
+	  end = new_end;
+	}
+      else
+	{
+	  /* Even the first group was wrong; determine maximum shift.  */
+	  if (end - cp > (int) *gp + 1)
+	    end = cp + (int) *gp + 1;
+	  else if (cp < begin)
+	    /* This number does not fill the first group, but is correct.  */
+	    return end;
+	  else
+	    /* CP points to a thousands separator character.  */
+	    end = cp;
+	}
+    }
+
+  return MAX (begin, end);
+}