llx: Introduce new iteration macros and some users.

[pspp] / src / libpspp / llx.c

diff --git a/src/libpspp/llx.c b/src/libpspp/llx.c
index c58f840c40a6db106d250e0cb6b5a9dec39efa5f..43704e314ea2080c833d4745dc4e6b85e4557604 100644 (file)
--- a/src/libpspp/llx.c
+++ b/src/libpspp/llx.c
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 2006, 2009 Free Software Foundation, Inc.
+   Copyright (C) 2006, 2009, 2011 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -28,9 +28,8 @@
 #include <config.h>
 #endif
 
-#include <libpspp/llx.h>
-#include "compiler.h"
-#include <assert.h>
+#include "libpspp/llx.h"
+#include "libpspp/compiler.h"
 #include <stdlib.h>
 
 /* Destroys LIST and frees all of its nodes using MANAGER.
@@ -165,7 +164,7 @@ llx_remove_range (struct llx *r0, struct llx *r1,
 {
   struct llx *llx;
 
-  for (llx = r0; llx != r1; )
+  for (llx = r0; llx != r1;)
     llx = llx_remove (llx, manager);
 }
 
@@ -182,7 +181,7 @@ llx_remove_equal (struct llx *r0, struct llx *r1, const void *target,
   size_t count;
 
   count = 0;
-  for (x = r0; x != r1; )
+  for (x = r0; x != r1;)
     if (compare (llx_data (x), target, aux) == 0)
       {
         x = llx_remove (x, manager);
@@ -207,7 +206,7 @@ llx_remove_if (struct llx *r0, struct llx *r1,
   size_t count;
 
   count = 0;
-  for (x = r0; x != r1; )
+  for (x = r0; x != r1;)
     if (predicate (llx_data (x), aux))
       {
         x = llx_remove (x, manager);
@@ -219,6 +218,20 @@ llx_remove_if (struct llx *r0, struct llx *r1,
   return count;
 }
 
+/* Returns the first node in R0...R1 that has data TARGET.
+   Returns NULL if no node in R0...R1 equals TARGET. */
+struct llx *
+llx_find (const struct llx *r0, const struct llx *r1, const void *target)
+{
+  const struct llx *x;
+
+  for (x = r0; x != r1; x = llx_next (x))
+    if (llx_data (x) == target)
+      return CONST_CAST (struct llx *, x);
+
+  return NULL;
+}
+
 /* Returns the first node in R0...R1 that equals TARGET
    according to COMPARE given auxiliary data AUX.
    Returns R1 if no node in R0...R1 equals TARGET. */