-/* PSPP - computes sample statistics.
- Copyright (C) 2006 Free Software Foundation, Inc.
+/* PSPP - a program for statistical analysis.
+ 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 the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ 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
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- This program 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.
+ This program 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 this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* External, circular doubly linked list. */
#include <config.h>
#endif
-#include <libpspp/llx.h>
-#include "compiler.h"
+#include "libpspp/llx.h"
+#include "libpspp/compiler.h"
#include <assert.h>
#include <stdlib.h>
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. */
for (x = r0; x != r1; x = llx_next (x))
if (compare (llx_data (x), target, aux) == 0)
break;
- return (struct llx *) x;
+ return CONST_CAST (struct llx *, x);
}
/* Returns the first node in R0...R1 for which PREDICATE returns
for (x = r0; x != r1; x = llx_next (x))
if (predicate (llx_data (x), aux))
break;
- return (struct llx *) x;
+ return CONST_CAST (struct llx *, x);
}
/* Compares each pair of adjacent nodes in R0...R1
for (x = r0, y = llx_next (x); y != r1; x = y, y = llx_next (y))
if (compare (llx_data (x), llx_data (y), aux) == 0)
- return (struct llx *) x;
+ return CONST_CAST (struct llx *, x);
}
- return (struct llx *) r1;
+ return CONST_CAST (struct llx *, r1);
}
/* Returns the number of nodes in R0...R1.
if (compare (llx_data (x), llx_data (max), aux) > 0)
max = x;
}
- return (struct llx *) max;
+ return CONST_CAST (struct llx *, max);
}
/* Returns the least node in R0...R1 according to COMPARE given
if (compare (llx_data (x), llx_data (min), aux) < 0)
min = x;
}
- return (struct llx *) min;
+ return CONST_CAST (struct llx *, min);
}
/* Lexicographically compares A0...A1 to B0...B1.
llx_data (r0), aux) <= 0);
}
- return (struct llx *) r0;
+ return CONST_CAST (struct llx *, r0);
}
/* Merges B0...B1 into A0...A1 according to COMPARE given
if (predicate (llx_data (x), aux))
return NULL;
- return (struct llx *) partition;
+ return CONST_CAST (struct llx *, partition);
}
\f
/* Allocates and returns a node using malloc. */