/*
* Sherlock Library -- Universal Sorter
*
- * (c) 2001 Martin Mares <mj@ucw.cz>
+ * (c) 2001--2004 Martin Mares <mj@ucw.cz>
+ *
+ * This software may be freely distributed and used according to the terms
+ * of the GNU Lesser General Public License.
*/
/*
* SORT_KEY [*] data type capable of storing a single key
* SORT_PREFIX(x) [*] add a name prefix (used on all global names
* defined by the sorter)
- * SORT_PRESORT include an in-core presorting pass
+ * SORT_PRESORT include an in-core presorting pass. Beware, when in
+ * the pre-sorting mode, it's quite possible that the
+ * comparison function will be called with both arguments
+ * identical.
* SORT_UNIFY merge items with identical keys
+ * SORT_UNIQUE all items have distinct keys (checked in debug mode)
+ * SORT_REGULAR all items are equally long and they don't contain
+ * anything else than the key. In this case, the sorter
+ * automatically supplies fetch_key, copy_data, fetch_item
+ * and store_item functions. Item size is also expected
+ * to be small.
* SORT_DELETE_INPUT a C expression, if true, the input files are
* deleted as soon as possible
* SORT_INPUT_FILE input is a file with this name
* SORT_INPUT_FB input is a fastbuf stream
+ * (can be safely NULL if you want to treat original
+ * input in a different way by file read functions)
* SORT_INPUT_FBPAIR input is a pair of fastbuf streams
* (not supported by the presorter)
* SORT_OUTPUT_FILE output is a file with this name
* fetch data belonging to a just fetched key and store
* them to memory following the key, but not over limit.
* Returns a pointer to first byte after the data
- * or NULL if the data don't fit.
- * Important: keys carrying no data must be position
- * independent.
+ * or NULL if the data don't fit. For variable-length
+ * keys, it can use the rest of SORT_KEY and even return
+ * pointer before end of the key.
+ * Important: before PREFIX_fetch_item() succeeds, the key
+ * must be position independent, the sorter can copy it.
* void PREFIX_store_item(struct fastbuf *f, SORT_KEY *k)
* [used only with SORT_PRESORT]
* write key and all its data read with PREFIX_fetch_data
* from the list of items, but not deallocated, so
* the remaining item can freely reference data of the
* other one.
+ *
+ * After including this file, all parameter macros are automatically
+ * undef'd.
*/
/* Declarations of externals from sorter.c */
extern uns sorter_presort_bufsize;
extern uns sorter_stream_bufsize;
-extern uns sorter_pass_counter, sorter_file_counter;
-struct fastbuf *sorter_open_tmp(void);
+extern uns sorter_pass_counter;
#endif /* !SORT_DECLS_READ */
#define LESS <=
#endif
+#if defined(SORT_UNIQUE) && defined(DEBUG)
+#define SORT_ASSERT_UNIQUE
+#endif
+
+#ifdef SORT_REGULAR
+
+static inline int
+P(fetch_key)(struct fastbuf *in, SORT_KEY *x)
+{
+ return breadb(in, x, sizeof(*x));
+}
+
+static inline void
+P(copy_data)(struct fastbuf *in UNUSED, struct fastbuf *out, SORT_KEY *x)
+{
+ bwrite(out, x, sizeof(*x));
+}
+
+static inline byte *
+P(fetch_item)(struct fastbuf *in UNUSED, SORT_KEY *x UNUSED, byte *limit UNUSED)
+{
+ return (byte *)(x+1);
+}
+
+static inline void
+P(store_item)(struct fastbuf *out, SORT_KEY *x)
+{
+ bwrite(out, x, sizeof(*x));
+}
+
+#endif
+
static struct fastbuf *
P(flush_out)(struct fastbuf *out)
{
if (out)
- {
- bflush(out);
- bsetpos(out, 0);
- }
+ brewind(out);
return out;
}
struct fastbuf *t;
SWAP(out1, out2, t);
if (!out1)
- out1 = sorter_open_tmp();
+ out1 = bopen_tmp(sorter_stream_bufsize);
run_count++;
}
if (comp LESS 0)
run2 = next2 && (P(compare)(kprev2, kin2) LESS 0);
kout = kprev2;
}
+#endif
+#ifdef SORT_ASSERT_UNIQUE
+ else if (unlikely(comp == 0))
+ ASSERT(0);
#endif
else
{
#ifdef SORT_PRESORT
+#if defined(SORT_REGULAR) && !defined(SORT_UNIFY)
+
+/* If we are doing a simple sort on a regular file, we can use a faster presorting strategy */
+
+static SORT_KEY *P(array);
+
+#define ASORT_PREFIX(x) SORT_PREFIX(x##_array)
+#define ASORT_KEY_TYPE SORT_KEY
+#define ASORT_ELT(i) P(array)[i]
+#define ASORT_LT(x,y) (P(compare)(&(x),&(y)) < 0)
+
+#include "lib/arraysort.h"
+
+static void
+P(presort)(struct fastbuf **fb1, struct fastbuf **fb2)
+{
+ struct fastbuf *in = *fb1;
+ struct fastbuf *out1 = NULL;
+ struct fastbuf *out2 = NULL;
+ struct fastbuf *tbuf;
+ uns buf_items = sorter_presort_bufsize / sizeof(SORT_KEY);
+ uns run_count = 0;
+ SORT_KEY last_out, *array;
+
+ ASSERT(!*fb2);
+ if (buf_items < 2)
+ die("PresortBuffer set too low");
+ P(array) = array = xmalloc(buf_items * sizeof(SORT_KEY));
+
+ for(;;)
+ {
+ uns s = bread(in, array, buf_items * sizeof(SORT_KEY));
+ uns n = s / sizeof(SORT_KEY);
+ ASSERT(!(s % sizeof(SORT_KEY)));
+ if (!n)
+ break;
+ P(sort_array)(n);
+#ifdef SORT_ASSERT_UNIQUE
+ for (uns i=0; i<n-1; i++)
+ if (unlikely(P(compare)(&array[i], &array[i+1]) >= 0))
+ ASSERT(0);
+ ASSERT(!run_count || P(compare)(&last_out, &array[0]));
+#endif
+ if (!run_count || P(compare)(&last_out, &array[0]) > 0)
+ {
+ run_count++;
+ SWAP(out1, out2, tbuf);
+ if (!out1)
+ out1 = bopen_tmp(sorter_stream_bufsize);
+ }
+ last_out = array[n-1];
+ bwrite(out1, array, n * sizeof(SORT_KEY));
+ }
+
+ bclose(in);
+ if (sorter_trace)
+ log(L_INFO, "Pass 0: %d runs, %d+%d KB",
+ run_count,
+ (out1 ? (int)((btell(out1) + 1023) / 1024) : 0),
+ (out2 ? (int)((btell(out2) + 1023) / 1024) : 0));
+ *fb1 = P(flush_out)(out1);
+ *fb2 = P(flush_out)(out2);
+ xfree(array);
+}
+
+#else
+
#define SORT_NODE struct P(presort_node)
SORT_NODE {
{
SWAP(out1, out2, tbuf);
if (!out1)
- out1 = sorter_open_tmp();
+ out1 = bopen_tmp(sorter_stream_bufsize);
current = buffer;
last = &first;
if (leftover)
first = second->next;
continue;
}
+#endif
+#ifdef SORT_ASSERT_UNIQUE
+ ASSERT(!first->next || P(compare)(&first->key, &first->next->key));
#endif
P(store_item)(out1, &first->key);
first = first->next;
(out2 ? (int)((btell(out2) + 1023) / 1024) : 0));
*fb1 = P(flush_out)(out1);
*fb2 = P(flush_out)(out2);
+ xfree(buffer);
}
+#endif /* SORT_REGULAR && !SORT_UNIFY */
+
#endif /* SORT_PRESORT */
static
#endif
#ifdef SORT_DELETE_INPUT
- fb1->is_temp_file = SORT_DELETE_INPUT;
+ bconfig(fb1, BCONFIG_IS_TEMP_FILE, SORT_DELETE_INPUT);
#endif
sorter_pass_counter = 1;
#ifdef SORT_PRESORT
#endif
do P(pass)(&fb1, &fb2); while (fb1 && fb2);
if (!fb1)
- fb1 = sorter_open_tmp();
+ fb1 = bopen_tmp(sorter_stream_bufsize);
#ifdef SORT_OUTPUT_FB
return fb1;
#else
- fb1->is_temp_file = 0;
+ bconfig(fb1, BCONFIG_IS_TEMP_FILE, 0);
if (rename(fb1->name, outname) < 0)
die("rename(%s,%s): %m", fb1->name, outname);
bclose(fb1);
#undef LESS
#undef SWAP
#undef SORT_NODE
+#undef SORT_KEY
+#undef SORT_PREFIX
+#undef SORT_UNIFY
+#undef SORT_UNIQUE
+#undef SORT_ASSERT_UNIQUE
+#undef SORT_REGULAR
+#undef SORT_DELETE_INPUT
+#undef SORT_INPUT_FILE
+#undef SORT_INPUT_FB
+#undef SORT_INPUT_FBPAIR
+#undef SORT_OUTPUT_FILE
+#undef SORT_OUTPUT_FB
#endif /* !SORT_DECLARE_ONLY */
projects / libucw.git / blobdiff