REFARRAY: New referenced array object

This object allows creation the arrays
with the reference count. Usefull when
there are many instances of some object
have to reference dynamically allocated array
which is common for all these instances.

In case of ELAPI the event object
keeps a referecne to the common array
of the sinks in the fail over order.

We decided that it will be a common object
not specific only to ELAPI.

All the review concerns related to this
object have been addressed in this patch.
It also has been moved to the common area.

7 files changed, 798 insertions, 0 deletions

diff --git a/common/refarray/Makefile.am b/common/refarray/Makefile.am
new file mode 100644
index 00000000..573173ac
--- /dev/null
+++ b/common/refarray/Makefile.am
@@ -0,0 +1,36 @@
+TRACE_LEVEL=@TRACE_VAR@
+
+topdir=$(srcdir)/..
+
+AM_CFLAGS =
+
+if HAVE_GCC
+    AM_CFLAGS += \
+        -Wall -Wshadow -Wstrict-prototypes -Wpointer-arith -Wcast-qual \
+        -Wcast-align -Wwrite-strings
+endif
+
+AM_CPPFLAGS = -I$(topdir)/trace -I$(topdir)/elapi/refarray $(TRACE_LEVEL)
+
+ACLOCAL_AMFLAGS = -I m4
+
+# Set up the pkg-config file
+pkgconfigdir = $(libdir)/pkgconfig
+dist_noinst_DATA = \
+    ref_array.pc \
+    m4
+
+# Build library
+noinst_LTLIBRARIES = libref_array.la
+libref_array_la_SOURCES = \
+    ref_array.c \
+    ref_array.h
+
+# Build unit test
+check_PROGRAMS = ref_array_ut
+ref_array_ut_SOURCES = ref_array_ut.c
+ref_array_ut_LDADD = libref_array.la
+
+TESTS = ref_array_ut
+
+tests: all $(check_PROGRAMS)
diff --git a/common/refarray/configure.ac b/common/refarray/configure.ac
new file mode 100644
index 00000000..b220c521
--- /dev/null
+++ b/common/refarray/configure.ac
@@ -0,0 +1,30 @@
+m4_include([../../version.m4])
+AC_INIT([sssd_libs],
+        VERSION_NUMBER,
+        [sssd-devel@lists.fedorahosted.org])
+AC_CONFIG_SRCDIR([ref_array.c])
+AC_CONFIG_AUX_DIR([build])
+AM_INIT_AUTOMAKE([-Wall -Werror foreign])
+AC_PROG_CC
+AC_PROG_LIBTOOL
+AC_CONFIG_MACRO_DIR([m4])
+AC_PROG_INSTALL
+
+AM_CONDITIONAL([HAVE_GCC], [test "$ac_cv_prog_gcc" = yes])
+
+m4_pattern_allow([AM_SILENT_RULES])
+AM_SILENT_RULES
+
+AC_CONFIG_HEADERS([config.h])
+
+# Enable trace build
+AC_ARG_ENABLE([trace],
+              [AS_HELP_STRING([--enable-trace[=LEVEL]],[build with low level tracing enabled])],
+              [trace_level="$enableval"],
+              [trace_level="0"])
+
+AS_IF([test ["$trace_level" -gt "0"] -a ["$trace_level" -lt "8"] ],[AC_SUBST([TRACE_VAR],["-DTRACE_LEVEL=$trace_level"])])
+
+AC_CONFIG_FILES([Makefile ref_array.pc])
+
+AC_OUTPUT
diff --git a/common/refarray/m4/.dir b/common/refarray/m4/.dir
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/common/refarray/m4/.dir
diff --git a/common/refarray/ref_array.c b/common/refarray/ref_array.c
new file mode 100644
index 00000000..d33a16b4
--- /dev/null
+++ b/common/refarray/ref_array.c
@@ -0,0 +1,294 @@
+/*
+    REF ARRAY
+
+    Implementation of the dynamic array with reference count.
+
+    Copyright (C) Dmitri Pal <dpal@redhat.com> 2009
+
+    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.
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define _GNU_SOURCE
+#include <errno.h>  /* for errors */
+#include <stdint.h>
+#include <malloc.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "ref_array.h"
+#include "config.h"
+#include "trace.h"
+
+/* The structure used in referenced array */
+struct ref_array {
+    void *storage;      /* The storage buffer */
+    size_t elsize;      /* Size of one element in the buffer */
+    uint32_t size;      /* Size of the storage in items */
+    uint32_t grow_by;   /* What increment use to reallocate memory */
+    uint32_t len;       /* Number of the elements in the array */
+    uint32_t refcount;  /* Reference count */
+    ref_array_fn cb;    /* Cleanup callback */
+    void *cb_data;      /* Caller's callback data */
+};
+
+/****************************************************/
+/* INTERNAL FUNCTIONS                               */
+/****************************************************/
+static int ref_array_grow(struct ref_array *ra)
+{
+    int error = EOK;
+    void *newbuf = NULL;
+
+    TRACE_FLOW_STRING("ref_array_grow", "Entry");
+
+    TRACE_INFO_NUMBER("Current length: ", ra->len);
+    TRACE_INFO_NUMBER("Current size: ", ra->size);
+
+    /* Grow buffer if needed */
+    newbuf = realloc(ra->storage, (ra->size + ra->grow_by) * ra->elsize);
+    if (newbuf == NULL) {
+        TRACE_ERROR_NUMBER("Failed to allocate memory.", ENOMEM);
+        return ENOMEM;
+    }
+
+    ra->storage = newbuf;
+    ra->size += ra->grow_by;
+
+    TRACE_INFO_NUMBER("Final size: ", ra->size);
+    TRACE_FLOW_NUMBER("elapi_grow_data. Exit. Returning", error);
+    return error;
+
+}
+
+
+/****************************************************/
+/* PUBLIC FUNCTIONS                                 */
+/****************************************************/
+
+/* Create referenced array */
+int ref_array_create(struct ref_array **ra,
+                     size_t elemsz,
+                     uint32_t grow_by,
+                     ref_array_fn cb,
+                     void *data)
+{
+    struct ref_array *new_ra = NULL;
+
+    TRACE_FLOW_STRING("ref_array_create", "Entry");
+
+    if (!ra) {
+        TRACE_ERROR_NUMBER("Uninitialized argument.", EINVAL);
+        return EINVAL;
+    }
+
+    if ((!elemsz) || (!grow_by)) {
+        TRACE_ERROR_NUMBER("Invalid argument.", EINVAL);
+        return EINVAL;
+    }
+
+    new_ra = (struct ref_array *)malloc(sizeof(struct ref_array));
+
+    if (!new_ra) {
+        TRACE_ERROR_NUMBER("Failed to allocate memory.", ENOMEM);
+        return ENOMEM;
+    }
+
+    new_ra->storage = NULL;
+    new_ra->elsize = elemsz;
+    new_ra->size = 0;
+    new_ra->grow_by = grow_by;
+    new_ra->len = 0;
+    new_ra->refcount = 1;
+    new_ra->cb = cb;
+    new_ra->cb_data = data;
+
+    *ra = new_ra;
+
+    TRACE_FLOW_STRING("ref_array_create", "Exit");
+    return EOK;
+}
+
+/* Get new reference to an array */
+struct ref_array *ref_array_getref(struct ref_array *ra)
+{
+    TRACE_FLOW_STRING("ref_array_getref", "Entry");
+
+    /* Check if array is not NULL */
+    if (ra) {
+        TRACE_INFO_NUMBER("Increasing reference count. Current: ", ra->refcount);
+        /* Increase reference count */
+        ra->refcount++;
+        TRACE_INFO_NUMBER("Increased reference count. New: ", ra->refcount);
+
+    }
+    else {
+        TRACE_ERROR_STRING("Uninitialized array.", "Returning NULL");
+    }
+
+    TRACE_FLOW_STRING("ref_array_getref", "Exit");
+    return ra;
+}
+
+/* Delete the array */
+void ref_array_destroy(struct ref_array *ra)
+{
+    int idx;
+
+    TRACE_FLOW_STRING("ref_array_destroy", "Entry");
+
+    /* Check if array is not NULL */
+    if (!ra) {
+        TRACE_ERROR_STRING("Uninitialized array.", "Coding error???");
+        return;
+    }
+
+    TRACE_INFO_NUMBER("Current reference count: ", ra->refcount);
+    if (ra->refcount) {
+        /* Decrease reference count */
+        ra->refcount--;
+        if (ra->refcount == 0) {
+            TRACE_INFO_NUMBER("It is time to delete array. Count:", ra->refcount);
+            if (ra->cb) {
+                for (idx = 0; idx < ra->len; idx++) {
+                    ra->cb((unsigned char *)(ra->storage) + idx * ra->elsize,
+                            REF_ARRAY_DESTROY, ra->cb_data);
+                }
+            }
+            free(ra->storage);
+            free(ra);
+        }
+    }
+    else {
+        /* Should never be here...
+         * This can happen if the caller by mistake would try to
+         * destroy the object from within the callback. Brrr....
+         */
+        TRACE_ERROR_STRING("Reference count is 0.", "Coding error???");
+    }
+
+    TRACE_FLOW_STRING("ref_array_destroy", "Exit");
+}
+
+/* Add new element to the array */
+int ref_array_append(struct ref_array *ra, void *element)
+{
+    int error = EOK;
+
+    TRACE_FLOW_STRING("ref_array_append", "Entry");
+    if ((!ra) || (!element)) {
+        TRACE_ERROR_NUMBER("Uninitialized argument.", EINVAL);
+        return EINVAL;
+    }
+
+    /* Do we have enough room for a new element? */
+    if (ra->size == ra->len) {
+        error = ref_array_grow(ra);
+        if (error) {
+            TRACE_ERROR_NUMBER("Failed to grow array.", error);
+            return EINVAL;
+        }
+    }
+
+    /* Copy element */
+    memcpy((unsigned char *)(ra->storage) + ra->len * ra->elsize,
+           element,
+           ra->elsize);
+
+    ra->len++;
+
+    TRACE_FLOW_STRING("ref_array_append", "Exit");
+    return error;
+}
+
+/* Get element */
+void *ref_array_get(struct ref_array *ra, uint32_t idx, void *acptr)
+{
+    TRACE_FLOW_STRING("ref_array_get", "Entry");
+
+    if (!ra) {
+        TRACE_ERROR_STRING("Uninitialized argument.", "");
+        return NULL;
+    }
+
+    if (idx >= ra->len) {
+        TRACE_ERROR_NUMBER("Invalid idx.", idx);
+        return NULL;
+    }
+
+    TRACE_INFO_NUMBER("Index: ", idx);
+
+    if (acptr) {
+
+        TRACE_INFO_STRING("Copying data.", "");
+        memcpy(acptr,
+               (unsigned char *)(ra->storage) + idx * ra->elsize,
+               ra->elsize);
+
+    }
+
+    TRACE_FLOW_STRING("ref_array_get returning internal storage", "Exit");
+    return (unsigned char *)(ra->storage) + idx * ra->elsize;
+}
+
+
+/* Get length */
+int ref_array_getlen(struct ref_array *ra, uint32_t *len)
+{
+    TRACE_FLOW_STRING("ref_array_getlen", "Entry");
+
+    if ((!ra) || (!len)) {
+        TRACE_ERROR_STRING("Uninitialized argument.", "");
+        return EINVAL;
+    }
+
+    *len = ra->len;
+
+    TRACE_FLOW_STRING("ref_array_getlen", "Exit");
+    return EOK;
+}
+
+/* Alternative function to get length */
+uint32_t ref_array_len(struct ref_array *ra)
+{
+    TRACE_FLOW_STRING("ref_array_len", "Entry");
+
+    if (!ra) {
+        TRACE_ERROR_STRING("Uninitialized argument.", "");
+        errno = EINVAL;
+        return 0;
+    }
+
+    TRACE_FLOW_STRING("ref_array_len", "Exit");
+    return ra->len;
+}
+
+
+/* Debug function */
+void ref_array_debug(struct ref_array *ra)
+{
+    int i,j;
+
+    printf("\nARRAY DUMP START\n");
+    printf("Length = %u\n", ra->len);
+    printf("Size = %u\n", ra->size);
+    printf("Element = %u\n", (unsigned int)(ra->elsize));
+    printf("Grow by = %u\n", ra->grow_by);
+    printf("Count = %u\n", ra->refcount);
+    printf("ARRAY:\n");
+    for (i = 0; i < ra->len; i++)  {
+        for (j = 0; j < ra->elsize; j++) {
+            printf("%x", *((unsigned char *)(ra->storage) + i * ra->elsize + j));
+        }
+        printf("\n%s\n", *((char **)((unsigned char *)(ra->storage) + i * ra->elsize)));
+    }
+    printf("\nARRAY DUMP END\n\n");
+}
diff --git a/common/refarray/ref_array.h b/common/refarray/ref_array.h
new file mode 100644
index 00000000..42112907
--- /dev/null
+++ b/common/refarray/ref_array.h
@@ -0,0 +1,84 @@
+/*
+    REF ARRAY
+
+    Header file for of the dynamic array with reference count.
+
+    Copyright (C) Dmitri Pal <dpal@redhat.com> 2009
+
+    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.
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef REF_ARRAY_H
+#define REF_ARRAY_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+struct ref_array;
+
+#ifndef EOK
+#define EOK 0
+#endif
+
+/*************************************/
+/* Interface to the referenced array */
+/*************************************/
+
+typedef enum
+{
+    REF_ARRAY_DESTROY,
+    REF_ARRAY_DELETE,
+} ref_array_del_enum;
+
+/* Callback that can be provided by caller
+ * to free data when the storage is actually destroyed
+ */
+typedef void (*ref_array_fn)(void *elem,
+                             ref_array_del_enum type,
+                             void *data);
+
+
+/* Create referenced array */
+int ref_array_create(struct ref_array **ra,
+                     size_t elem,
+                     uint32_t grow_by,
+                     ref_array_fn cb,
+                     void *data);
+
+/* Get new reference to an array */
+struct ref_array *ref_array_getref(struct ref_array *ra);
+
+/* Delete the array */
+void ref_array_destroy(struct ref_array *ra);
+
+/* Add new element to the array */
+int ref_array_append(struct ref_array *ra, void *element);
+
+/* Get element */
+void *ref_array_get(struct ref_array *ra, uint32_t idx, void *acptr);
+
+/* Get array length */
+int ref_array_getlen(struct ref_array *ra, uint32_t *len);
+
+/* Alternative function to get length.
+ * Returns 0 if the array is invalid
+ */
+uint32_t ref_array_len(struct ref_array *ra);
+
+
+/* In future in might make sense to add entry points
+ * to insert and delete elements from the array.
+ * Current use cases do not require this kind of
+ * functionality so it is left out of the implementation
+ */
+
+#endif
diff --git a/common/refarray/ref_array.pc.in b/common/refarray/ref_array.pc.in
new file mode 100644
index 00000000..1fc06f71
--- /dev/null
+++ b/common/refarray/ref_array.pc.in
@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: @PACKAGE_NAME@
+Description: Reference library
+Version: @PACKAGE_VERSION@
+Libs: -L${libdir} -lref_array
+Cflags: -I${includedir}
+URL: http://fedorahosted.org/sssd/
diff --git a/common/refarray/ref_array_ut.c b/common/refarray/ref_array_ut.c
new file mode 100644
index 00000000..c85b6b26
--- /dev/null
+++ b/common/refarray/ref_array_ut.c
@@ -0,0 +1,343 @@
+/*
+    REF ARRAY
+
+    Implementation of the dynamic array with reference count.
+
+    Copyright (C) Dmitri Pal <dpal@redhat.com> 2009
+
+    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.
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define _GNU_SOURCE
+#include <errno.h>  /* for errors */
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "ref_array.h"
+#include "config.h"
+#define TRACE_HOME
+#include "trace.h"
+
+int verbose = 0;
+
+#define RAOUT(foo) \
+    do { \
+        if (verbose) foo; \
+    } while(0)
+
+extern void ref_array_debug(struct ref_array *ra);
+
+typedef int (*test_fn)(void);
+
+/* Basic test */
+int ref_array_basic_test(void)
+{
+    const char *line1 = "line1";
+    const char *line2 = "line2";
+    const char *line3 = "line3";
+    const char *line4 = "line4";
+    const char *line5 = "line5";
+    const char *line6 = "line6";
+    uint32_t i;
+    struct ref_array *ra;
+    struct ref_array *ra2;
+    int error = EOK;
+    uint32_t len = 0;
+    uint32_t other_len = 0;
+    char *ret;
+    char *elem;
+    void *ptr;
+
+    error = ref_array_create(&ra, sizeof(char *), 1, NULL, NULL);
+    if (error) {
+        printf("Failed to create array %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    error = ref_array_append(ra, &line1);
+    if (error) {
+        ref_array_destroy(ra);
+        printf("Failed to append to array line 1 %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    error = ref_array_append(ra, &line2);
+    if (error) {
+        ref_array_destroy(ra);
+        printf("Failed to append to array line 2 %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    error = ref_array_append(ra, &line3);
+    if (error) {
+        ref_array_destroy(ra);
+        printf("Failed to append to array line 3 %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    error = ref_array_append(ra, &line4);
+    if (error) {
+        ref_array_destroy(ra);
+        printf("Failed to append to array line 4 %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    error = ref_array_append(ra, &line5);
+    if (error) {
+        ref_array_destroy(ra);
+        printf("Failed to append to array line 5 %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    error = ref_array_append(ra, &line6);
+    if (error) {
+        ref_array_destroy(ra);
+        printf("Failed to append to array line 6 %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    RAOUT(printf("\n\nTest 1 - Printing lines.\n\n"));
+
+    error = ref_array_getlen(ra, &other_len);
+    if (error) {
+        ref_array_destroy(ra);
+        printf("Failed to get length %d\n", error);
+        return error;
+    }
+
+    len = ref_array_len(ra);
+
+    if (len != other_len) {
+        ref_array_destroy(ra);
+        printf("Lengths do not match:\n");
+        printf("Len    : %d\n", len);
+        printf("Get Len: %d\n", other_len);
+        return EFAULT;
+    }
+
+    for (i = 0; i < len; i++) {
+        ref_array_get(ra, i, &ret);
+        RAOUT(printf("%s\n", ret));
+    }
+
+    RAOUT(printf("\n\nTest 2 - Creating reference and then printing lines.\n\n"));
+
+    ra2 = ref_array_getref(ra);
+    ref_array_destroy(ra);
+
+    for (i = 0; i < len; i++) {
+        ret = *((char **)ref_array_get(ra2, i, NULL));
+        RAOUT(printf("%s\n", ret));
+    }
+
+    RAOUT(printf("\n\nTest 3 - Get elements with copying.\n\n"));
+
+    for (i = 0; i < len; i++) {
+        ref_array_get(ra2, i, &ret);
+        RAOUT(printf("%s\n", ret));
+    }
+
+    RAOUT(printf("\n\nTest 4a - Get elements with copying and assignment.\n\n"));
+
+    /* This is a bad practice to use one variable
+     * as a parameter and as an acceptor for the return value.
+     * See next example for a better way to do it.
+     */
+    for (i = 0; i < len; i++) {
+        ret = *((char **)ref_array_get(ra2, i, &ret));
+        RAOUT(printf("%s\n", ret));
+    }
+
+    RAOUT(printf("\n\nTest 4b - Get elements with copying and assignment.\n\n"));
+
+    for (i = 0; i < len; i++) {
+        ret = *((char **)ref_array_get(ra2, i, &elem));
+        RAOUT(printf("%s\n", ret));
+        RAOUT(printf("%s\n", elem));
+        if (strcmp(ret, elem) != 0) {
+            ref_array_destroy(ra2);
+            printf("\nRetrieved strings were expected to be same,\n");
+            printf("but they are not:\n");
+            printf("By pointer:[%s]\nAs element:[%s]\n", ret, elem);
+            return EFAULT;
+        }
+    }
+
+    RAOUT(printf("\n\nTest 5 - While loop up.\n\n"));
+
+    i = 0;
+    for (;;) {
+        ptr = ref_array_get(ra2, i, &ret);
+        if (ptr) {
+            RAOUT(printf("%s\n", ret));
+            i++;
+        }
+        else break;
+    }
+
+    RAOUT(printf("\n\nTest 6 - While loop down.\n\n"));
+
+    i = len - 1;
+    for (;;) {
+        ptr = ref_array_get(ra2, i, &ret);
+        if (ptr) {
+            RAOUT(printf("%s\n", ret));
+            i--;
+        }
+        else break;
+    }
+
+    RAOUT(printf("\n\nDone!!!\n\n"));
+
+    ref_array_destroy(ra2);
+    return EOK;
+}
+
+void array_cleanup(void *elem,
+                   ref_array_del_enum type,
+                   void *data)
+{
+    RAOUT(printf("%s%s\n", (char *)data, *((char **)elem)));
+    free(*((char **)elem));
+}
+
+/* Free test */
+int ref_array_free_test(void)
+{
+    const char *line1 = "line1";
+    const char *line2 = "line2";
+    const char *line3 = "line3";
+    const char *line4 = "line4";
+    char text[] = "Deleting: ";
+    char *str;
+    uint32_t i;
+    struct ref_array *ra;
+    int error = EOK;
+    char *ret;
+    void *ptr;
+
+    error = ref_array_create(&ra, sizeof(char *), 1, array_cleanup, (char *)text);
+    if (error) {
+        printf("Failed to create array %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    str = strdup(line1);
+
+    error = ref_array_append(ra, &str);
+    if (error) {
+        ref_array_destroy(ra);
+        printf("Failed to append to array line 1 %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    str = strdup(line2);
+
+    error = ref_array_append(ra, &str);
+    if (error) {
+        ref_array_destroy(ra);
+        printf("Failed to append to array line 2 %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    str = strdup(line3);
+
+    error = ref_array_append(ra, &str);
+    if (error) {
+        ref_array_destroy(ra);
+        printf("Failed to append to array line 3 %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    str = strdup(line4);
+
+    error = ref_array_append(ra, &str);
+    if (error) {
+        ref_array_destroy(ra);
+        printf("Failed to append to array line 4 %d\n", error);
+        return error;
+    }
+
+    RAOUT(ref_array_debug(ra));
+
+    i = 0;
+    for (;;) {
+        ptr = ref_array_get(ra, i, &ret);
+        if (ptr) {
+            RAOUT(printf("%s\n", ret));
+            i++;
+        }
+        else break;
+    }
+
+    RAOUT(printf("\n\nDone!!!\n\n"));
+
+    ref_array_destroy(ra);
+    return EOK;
+}
+
+
+
+/* Main function of the unit test */
+int main(int argc, char *argv[])
+{
+    int error = 0;
+    test_fn tests[] = { ref_array_basic_test,
+                        ref_array_free_test,
+                        NULL };
+    test_fn t;
+    int i = 0;
+    char *var;
+
+    if ((argc > 1) && (strcmp(argv[1], "-v") == 0)) verbose = 1;
+    else {
+        var = getenv("COMMON_TEST_VERBOSE");
+        if (var) verbose = 1;
+    }
+
+    RAOUT(printf("Start\n"));
+
+    while ((t = tests[i++])) {
+        error = t();
+        if (error) {
+            RAOUT(printf("Failed with error %d!\n", error));
+            return error;
+        }
+    }
+
+    RAOUT(printf("Success!\n"));
+    return 0;
+}