Add bash 5.2 to third_party

third_party/bash/list.c

@@ -0,0 +1,136 @@
+/* list.c - Functions for manipulating linked lists of objects. */
+
+/* Copyright (C) 1996-2009 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash 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 3 of the License, or
+   (at your option) any later version.
+
+   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "config.h"
+
+#if defined (HAVE_UNISTD_H)
+#  ifdef _MINIX
+#    include <sys/types.h>
+#  endif
+#  include <unistd.h>
+#endif
+
+#include "shell.h"
+
+/* A global variable which acts as a sentinel for an `error' list return. */
+GENERIC_LIST global_error_list;
+
+#ifdef INCLUDE_UNUSED
+/* Call FUNCTION on every member of LIST, a generic list. */
+void
+list_walk (list, function)
+     GENERIC_LIST *list;
+     sh_glist_func_t *function;
+{
+  for ( ; list; list = list->next)
+    if ((*function) (list) < 0)
+      return;
+}
+
+/* Call FUNCTION on every string in WORDS. */
+void
+wlist_walk (words, function)
+     WORD_LIST *words;
+     sh_icpfunc_t *function;
+{
+  for ( ; words; words = words->next)
+    if ((*function) (words->word->word) < 0)
+      return;
+}
+#endif /* INCLUDE_UNUSED */
+
+/* Reverse the chain of structures in LIST.  Output the new head
+   of the chain.  You should always assign the output value of this
+   function to something, or you will lose the chain. */
+GENERIC_LIST *
+list_reverse (list)
+     GENERIC_LIST *list;
+{
+  register GENERIC_LIST *next, *prev;
+
+  for (prev = (GENERIC_LIST *)NULL; list; )
+    {
+      next = list->next;
+      list->next = prev;
+      prev = list;
+      list = next;
+    }
+  return (prev);
+}
+
+/* Return the number of elements in LIST, a generic list. */
+int
+list_length (list)
+     GENERIC_LIST *list;
+{
+  register int i;
+
+  for (i = 0; list; list = list->next, i++);
+  return (i);
+}
+
+/* Append TAIL to HEAD.  Return the header of the list. */
+GENERIC_LIST *
+list_append (head, tail)
+     GENERIC_LIST *head, *tail;
+{
+  register GENERIC_LIST *t_head;
+
+  if (head == 0)
+    return (tail);
+
+  for (t_head = head; t_head->next; t_head = t_head->next)
+    ;
+  t_head->next = tail;
+  return (head);
+}
+
+#ifdef INCLUDE_UNUSED
+/* Delete the element of LIST which satisfies the predicate function COMPARER.
+   Returns the element that was deleted, so you can dispose of it, or -1 if
+   the element wasn't found.  COMPARER is called with the list element and
+   then ARG.  Note that LIST contains the address of a variable which points
+   to the list.  You might call this function like this:
+
+   SHELL_VAR *elt = list_remove (&variable_list, check_var_has_name, "foo");
+   dispose_variable (elt);
+*/
+GENERIC_LIST *
+list_remove (list, comparer, arg)
+     GENERIC_LIST **list;
+     Function *comparer;
+     char *arg;
+{
+  register GENERIC_LIST *prev, *temp;
+
+  for (prev = (GENERIC_LIST *)NULL, temp = *list; temp; prev = temp, temp = temp->next)
+    {
+      if ((*comparer) (temp, arg))
+	{
+	  if (prev)
+	    prev->next = temp->next;
+	  else
+	    *list = temp->next;
+	  return (temp);
+	}
+    }
+  return ((GENERIC_LIST *)&global_error_list);
+}
+#endif