Merge https://github.com/dgibson/ccan

ccan/bitmap/LICENSE

+../../licenses/LGPL-2.1
\ No newline at end of file

ccan/bitmap/_info

+#include <string.h>
+#include "config.h"
+
+/**
+ * bitmap - bitmap handling
+ *
+ * This code handles manipulation of bitmaps, arbitrary length arrays
+ * of bits.
+ *
+ * License: LGPL (v2.1 or any later version)
+ * Author: David Gibson <david@gibson.dropbear.id.au>
+ */
+int main(int argc, char *argv[])
+{
+	/* Expect exactly one argument */
+	if (argc != 2)
+		return 1;
+
+	if (strcmp(argv[1], "depends") == 0) {
+		printf("ccan/endian\n");
+		return 0;
+	}
+
+        if (strcmp(argv[1], "testdepends") == 0) {
+                printf("ccan/array_size\n");
+		printf("ccan/foreach\n");
+                return 0;
+        }
+
+	return 1;
+}

ccan/bitmap/bitmap.h

+/* Licensed under LGPLv2+ - see LICENSE file for details */
+#ifndef CCAN_BITMAP_H_
+#define CCAN_BITMAP_H_
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+#include <ccan/endian/endian.h>
+
+typedef unsigned long bitmap_word;
+
+#define BITMAP_WORD_BITS	(sizeof(bitmap_word) * CHAR_BIT)
+#define BITMAP_NWORDS(_n)	\
+	(((_n) + BITMAP_WORD_BITS - 1) / BITMAP_WORD_BITS)
+
+/*
+ * We wrap each word in a structure for type checking.
+ */
+typedef struct {
+	bitmap_word w;
+} bitmap;
+
+#define BITMAP_DECLARE(_name, _nbits) \
+	bitmap (_name)[BITMAP_NWORDS(_nbits)]
+
+static inline size_t bitmap_sizeof(int nbits)
+{
+	return BITMAP_NWORDS(nbits) * sizeof(bitmap_word);
+}
+
+static inline bitmap *bitmap_alloc(int nbits)
+{
+	return malloc(bitmap_sizeof(nbits));
+}
+
+static inline bitmap_word bitmap_bswap(bitmap_word w)
+{
+	if (BITMAP_WORD_BITS == 32)
+		return cpu_to_be32(w);
+	else if (BITMAP_WORD_BITS == 64)
+		return cpu_to_be64(w);
+}
+
+#define BITMAP_WORD(_bm, _n)	((_bm)[(_n) / BITMAP_WORD_BITS].w)
+#define BITMAP_WORDBIT(_n) 	\
+	(bitmap_bswap(1UL << (BITMAP_WORD_BITS - ((_n) % BITMAP_WORD_BITS) - 1)))
+
+#define BITMAP_HEADWORDS(_nbits) \
+	((_nbits) / BITMAP_WORD_BITS)
+#define BITMAP_HEADBYTES(_nbits) \
+	(BITMAP_HEADWORDS(_nbits) * sizeof(bitmap_word))
+
+#define BITMAP_TAILWORD(_bm, _nbits) \
+	((_bm)[BITMAP_HEADWORDS(_nbits)].w)
+#define BITMAP_HASTAIL(_nbits)	(((_nbits) % BITMAP_WORD_BITS) != 0)
+#define BITMAP_TAILBITS(_nbits)	\
+	(bitmap_bswap(~(-1UL >> ((_nbits) % BITMAP_WORD_BITS))))
+#define BITMAP_TAIL(_bm, _nbits) \
+	(BITMAP_TAILWORD(_bm, _nbits) & BITMAP_TAILBITS(_nbits))
+
+static inline void bitmap_set_bit(bitmap *bitmap, int n)
+{
+	BITMAP_WORD(bitmap, n) |= BITMAP_WORDBIT(n);
+}
+
+static inline void bitmap_clear_bit(bitmap *bitmap, int n)
+{
+	BITMAP_WORD(bitmap, n) &= ~BITMAP_WORDBIT(n);
+}
+
+static inline void bitmap_change_bit(bitmap *bitmap, int n)
+{
+	BITMAP_WORD(bitmap, n) ^= BITMAP_WORDBIT(n);
+}
+
+static inline bool bitmap_test_bit(bitmap *bitmap, int n)
+{
+	return !!(BITMAP_WORD(bitmap, n) & BITMAP_WORDBIT(n));
+}
+
+
+static inline void bitmap_zero(bitmap *bitmap, int nbits)
+{
+	memset(bitmap, 0, bitmap_sizeof(nbits));
+}
+
+static inline void bitmap_fill(bitmap *bitmap, int nbits)
+{
+	memset(bitmap, 0xff, bitmap_sizeof(nbits));
+}
+
+static inline void bitmap_copy(bitmap *dst, bitmap *src, int nbits)
+{
+	memcpy(dst, src, bitmap_sizeof(nbits));
+}
+
+#define BITMAP_DEF_BINOP(_name, _op) \
+	static inline void bitmap_##_name(bitmap *dst, bitmap *src1, bitmap *src2, \
+					 int nbits) \
+	{ \
+		int i = 0; \
+		for (i = 0; i < BITMAP_NWORDS(nbits); i++) { \
+			dst[i].w = src1[i].w _op src2[i].w; \
+		} \
+	}
+
+BITMAP_DEF_BINOP(and, &)
+BITMAP_DEF_BINOP(or, |)
+BITMAP_DEF_BINOP(xor, ^)
+BITMAP_DEF_BINOP(andnot, & ~)
+
+#undef BITMAP_DEF_BINOP
+
+static inline void bitmap_complement(bitmap *dst, bitmap *src, int nbits)
+{
+	int i;
+
+	for (i = 0; i < BITMAP_NWORDS(nbits); i++)
+		dst[i].w = ~src[i].w;
+}
+
+static inline bool bitmap_equal(bitmap *src1, bitmap *src2, int nbits)
+{
+	return (memcmp(src1, src2, BITMAP_HEADBYTES(nbits)) == 0)
+		&& (!BITMAP_HASTAIL(nbits)
+		    || (BITMAP_TAIL(src1, nbits) == BITMAP_TAIL(src2, nbits)));
+}
+
+static inline bool bitmap_intersects(bitmap *src1, bitmap *src2, int nbits)
+{
+	int i;
+
+	for (i = 0; i < BITMAP_HEADWORDS(nbits); i++) {
+		if (src1[i].w & src2[i].w)
+			return true;
+	}
+	if (BITMAP_HASTAIL(nbits) &&
+	    (BITMAP_TAIL(src1, nbits) & BITMAP_TAIL(src2, nbits)))
+		return true;
+	return false;
+}
+
+static inline bool bitmap_subset(bitmap *src1, bitmap *src2, int nbits)
+{
+	int i;
+
+	for (i = 0; i < BITMAP_HEADWORDS(nbits); i++) {
+		if (src1[i].w  & ~src2[i].w)
+			return false;
+	}
+	if (BITMAP_HASTAIL(nbits) &&
+	    (BITMAP_TAIL(src1, nbits) & ~BITMAP_TAIL(src2, nbits)))
+		return false;
+	return true;
+}
+
+static inline bool bitmap_full(bitmap *bitmap, int nbits)
+{
+	int i;
+
+	for (i = 0; i < BITMAP_HEADWORDS(nbits); i++) {
+		if (bitmap[i].w != -1UL)
+			return false;
+	}
+	if (BITMAP_HASTAIL(nbits) &&
+	    (BITMAP_TAIL(bitmap, nbits) != BITMAP_TAILBITS(nbits)))
+		return false;
+
+	return true;
+}
+
+static inline bool bitmap_empty(bitmap *bitmap, int nbits)
+{
+	int i;
+
+	for (i = 0; i < BITMAP_HEADWORDS(nbits); i++) {
+		if (bitmap[i].w != 0)
+			return false;
+	}
+	if (BITMAP_HASTAIL(nbits) && (BITMAP_TAIL(bitmap, nbits) != 0))
+		return false;
+
+	return true;
+}
+
+#endif /* CCAN_BITMAP_H_ */

ccan/bitmap/test/run.c

+#include <ccan/bitmap/bitmap.h>
+#include <ccan/tap/tap.h>
+#include <ccan/array_size/array_size.h>
+#include <ccan/foreach/foreach.h>
+
+int bitmap_sizes[] = {
+	1, 2, 3, 4, 5, 6, 7, 8,
+	16, 17, 24, 32, 33,
+	64, 65, 127, 128, 129,
+	1023, 1024, 1025,
+};
+#define NSIZES ARRAY_SIZE(bitmap_sizes)
+#define NTESTS 9
+
+static void test_sizes(int nbits, bool dynalloc)
+{
+	BITMAP_DECLARE(sbitmap, nbits);
+	uint32_t marker;
+	bitmap *bitmap;
+	int i, j;
+	bool wrong;
+
+	if (dynalloc) {
+		bitmap = bitmap_alloc(nbits);
+		ok1(bitmap != NULL);
+	} else {
+		bitmap = sbitmap;
+		marker = 0xdeadbeef;
+	}
+
+	bitmap_zero(bitmap, nbits);
+	wrong = false;
+	for (i = 0; i < nbits; i++) {
+		wrong = wrong || bitmap_test_bit(bitmap, i);
+	}
+	ok1(!wrong);
+
+	bitmap_fill(bitmap, nbits);
+	wrong = false;
+	for (i = 0; i < nbits; i++) {
+		wrong = wrong || !bitmap_test_bit(bitmap, i);
+	}
+	ok1(!wrong);
+
+	wrong = false;
+	for (i = 0; i < nbits; i++) {
+		bitmap_zero(bitmap, nbits);
+		bitmap_set_bit(bitmap, i);
+		for (j = 0; j < nbits; j++) {
+			bool val = (i == j);
+
+			wrong = wrong || (bitmap_test_bit(bitmap, j) != val);
+		}
+	}
+	ok1(!wrong);
+
+	wrong = false;
+	for (i = 0; i < nbits; i++) {
+		bitmap_fill(bitmap, nbits);
+		bitmap_clear_bit(bitmap, i);
+		for (j = 0; j < nbits; j++) {
+			bool val = !(i == j);
+
+			wrong = wrong || (bitmap_test_bit(bitmap, j) != val);
+		}
+	}
+	ok1(!wrong);
+
+	bitmap_zero(bitmap, nbits);
+	ok1(bitmap_empty(bitmap, nbits));
+
+	wrong = false;
+	for (i = 0; i < nbits; i++) {
+		bitmap_zero(bitmap, nbits);
+		bitmap_set_bit(bitmap, i);
+		wrong = wrong || bitmap_empty(bitmap, nbits);
+	}
+	ok1(!wrong);
+
+	bitmap_fill(bitmap, nbits);
+	ok1(bitmap_full(bitmap, nbits));
+
+	wrong = false;
+	for (i = 0; i < nbits; i++) {
+		bitmap_fill(bitmap, nbits);
+		bitmap_clear_bit(bitmap, i);
+		wrong = wrong || bitmap_full(bitmap, nbits);
+	}
+	ok1(!wrong);
+	
+	if (dynalloc) {
+		free(bitmap);
+	} else {
+		ok1(marker == 0xdeadbeef);
+	}
+}
+
+int main(void)
+{
+	int i;
+	bool dynalloc;
+
+	/* This is how many tests you plan to run */
+	plan_tests(NSIZES * NTESTS * 2);
+
+	for (i = 0; i < NSIZES; i++) {
+		foreach_int(dynalloc, false, true) {
+			diag("Testing %d-bit bitmap (%s allocation)",
+			     bitmap_sizes[i], dynalloc ? "dynamic" : "static");
+			test_sizes(bitmap_sizes[i], dynalloc);
+		}
+	}
+
+	/* This exits depending on whether all tests passed */
+	return exit_status();
+}