libds

commit b1d8eaab95257c6e823bafb2441e5e78020ca182
Author: sin <sin@2f30.org>
Date:   Mon,  7 Apr 2014 14:38:28 +0100

Initial commit

Diffstat:
A
LICENSE
 | 
21
+++++++++++++++++++++
A
Makefile
 | 
48
++++++++++++++++++++++++++++++++++++++++++++++++
A
config.mk
 | 
20
++++++++++++++++++++
A
ds.h
 | 
11
+++++++++++
A
hat.c
 | 
107
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

5 files changed, 207 insertions(+), 0 deletions(-)
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,21 @@
+MIT/X Consortium License
+
+© 2014 sin <sin@2f30.org>
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/Makefile b/Makefile
@@ -0,0 +1,48 @@
+# libds - a simple data structures library
+# See LICENSE file for copyright and license details.
+
+include config.mk
+
+SRC = hat.c
+OBJ = ${SRC:.c=.o}
+SOUT = ${NAME}.a
+
+all: options ${SOUT}
+
+options:
+	@echo ${NAME} build options:
+	@echo "CFLAGS   = ${CFLAGS}"
+	@echo "LDFLAGS  = ${LDFLAGS}"
+	@echo "CC       = ${CC}"
+
+.c.o:
+	@echo CC $<
+	@${CC} -c ${CFLAGS} $<
+
+${OBJ}: config.mk
+
+${SOUT}: ${OBJ} 
+	@ar rcs ${SOUT} ${OBJ}
+
+clean:
+	@echo cleaning
+	@rm -f *.a ${NAME} ${OBJ}
+
+install: all
+	@echo installing libraries to ${DESTDIR}${PREFIX}/lib
+	@mkdir -p ${DESTDIR}${PREFIX}/lib
+	@cp -f ${NAME}.a ${DESTDIR}${PREFIX}/lib
+	@chmod 755 ${DESTDIR}${PREFIX}/lib/${NAME}.*
+	@echo installing header file to ${DESTDIR}${PREFIX}/include
+	@mkdir -p ${DESTDIR}${PREFIX}/include
+	@cp -f ds.h ${DESTDIR}${PREFIX}/include
+	@chmod 644 ${DESTDIR}${PREFIX}/include/ds.h
+
+uninstall:
+	@echo removing libraries from ${DESTDIR}${PREFIX}/lib
+	@rm -f ${DESTDIR}${PREFIX}/lib/${NAME}.a
+	@echo removing header file from ${DESTDIR}${PREFIX}/include
+	@rm -f ${DESTDIR}${PREFIX}/include/ds.h
+
+.PHONY: all options clean install uninstall
+# DO NOT DELETE
diff --git a/config.mk b/config.mk
@@ -0,0 +1,20 @@
+NAME = libds
+VERSION = 0.0
+
+# Customize below to fit your system
+
+# paths
+PREFIX ?= /usr
+MANPREFIX = ${PREFIX}/share/man
+
+# includes and libs
+INCS = -I. -I/usr/include
+LIBS = -L/usr/lib -lc
+
+# flags
+CPPFLAGS = -DVERSION=\"${VERSION}\"
+CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
+LDFLAGS = ${LIBS}
+
+# compiler and linker
+CC = cc
diff --git a/ds.h b/ds.h
@@ -0,0 +1,11 @@
+#ifndef LIBDS_H
+#define LIBDS_H
+
+#include <stddef.h>
+
+struct hat *hat_init(void);
+void hat_free(struct hat *);
+size_t hat_add(struct hat *, void *);
+void *hat_get(struct hat *, size_t);
+
+#endif
diff --git a/hat.c b/hat.c
@@ -0,0 +1,107 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct leaf {
+	void *data;
+};
+
+struct hat {
+	struct leaf **l;
+	size_t sz;
+	size_t ne;
+};
+
+static int
+grow(struct hat *hat)
+{
+	struct leaf **tmp, *l;
+	size_t i, j, ne = 0;
+
+	tmp = calloc(hat->sz * 2, sizeof(*tmp));
+	if (!tmp)
+		return -1;
+	for (i = 0; i < hat->sz / 2; i++) {
+		tmp[i] = calloc(hat->sz * 2, sizeof(**tmp));
+		if (!tmp[i]) {
+			while (--i >= 0)
+				free(tmp[i]);
+			free(tmp);
+			return -1;
+		}
+	}
+	for (i = 0; i < hat->sz; i++) {
+		l = tmp[ne / (hat->sz * 2)];
+		for (j = 0; j < hat->sz; j++) {
+			l[ne % (hat->sz * 2)].data = hat->l[i][j].data;
+			ne++;
+		}
+		free(hat->l[i]);
+	}
+	free(hat->l);
+	hat->l = tmp;
+	hat->sz *= 2;
+	return 0;
+}
+
+struct hat *
+hat_init(void)
+{
+	struct hat *hat;
+
+	hat = calloc(1, sizeof(*hat));
+	if (!hat)
+		return NULL;
+	hat->sz = 2;
+	hat->l = calloc(hat->sz, sizeof(*hat->l));
+	if (!hat->l) {
+		free(hat);
+		return NULL;
+	}
+	return hat;
+}
+
+void
+hat_free(struct hat *hat)
+{
+	size_t i;
+
+	for (i = 0; i < hat->sz; i++)
+		free(hat->l[i]);
+	free(hat->l);
+}
+
+size_t
+hat_add(struct hat *hat, void *data)
+{
+	size_t index, offset;
+	struct leaf *l;
+
+	if (hat->ne == hat->sz * hat->sz)
+		if (grow(hat) < 0)
+			return -1;
+	index = hat->ne / hat->sz;
+	offset = hat->ne % hat->sz;
+	if (!hat->l[index]) {
+		hat->l[index] = calloc(hat->sz, sizeof(**hat->l));
+		if (!hat->l[index])
+			return -1;
+	}
+	l = hat->l[index];
+	l[offset].data = data;
+	return hat->ne++;
+}
+
+void *
+hat_get(struct hat *hat, size_t i)
+{
+	size_t index, offset;
+	struct leaf *l;
+
+	index = i / hat->sz;
+	offset = i % hat->sz;
+	if (hat->l[index]) {
+		l = hat->l[index];
+		return l[offset].data;
+	}
+	return NULL;
+}