1 files changed, 137 insertions, 4 deletions

diff --git a/lib/util/util_strlist.c b/lib/util/util_strlist.c
index b069a11e38..bd7bd00888 100644
--- a/lib/util/util_strlist.c
+++ b/lib/util/util_strlist.c
@@ -187,7 +187,7 @@ _PUBLIC_ char *str_list_join_shell(TALLOC_CTX *mem_ctx, const char **list, char
 /**
   return the number of elements in a string list
 */
-_PUBLIC_ size_t str_list_length(const char * const*list)
+_PUBLIC_ size_t str_list_length(const char **list)
 {
 	size_t ret;
 	for (ret=0;list && list[ret];ret++) /* noop */ ;
@@ -247,12 +247,12 @@ _PUBLIC_ bool str_list_equal(const char **list1, const char **list2)
 /**
   add an entry to a string list
 */
-_PUBLIC_ const char **str_list_add(const char **list, const char *s)
+_PUBLIC_ char **str_list_add(char **list, const char *s)
 {
 	size_t len = str_list_length(list);
-	const char **ret;
+	char **ret;
 
-	ret = talloc_realloc(NULL, list, const char *, len+2);
+	ret = talloc_realloc(NULL, list, char *, len+2);
 	if (ret == NULL) return NULL;
 
 	ret[len] = talloc_strdup(ret, s);
@@ -308,3 +308,136 @@ _PUBLIC_ bool str_list_check_ci(const char **list, const char *s)
 }
 
 
+/**
+  append one list to another - expanding list1
+*/
+_PUBLIC_ char **str_list_append(char **list1, const char **list2)
+{
+	size_t len1 = str_list_length(list1);
+	size_t len2 = str_list_length(list2);
+	char **ret;
+	int i;
+
+	ret = talloc_realloc(NULL, list1, char *, len1+len2+1);
+	if (ret == NULL) return NULL;
+
+	for (i=len1;i<len1+len2;i++) {
+		ret[i] = talloc_strdup(ret, list2[i-len1]);
+		if (ret[i] == NULL) {
+			return NULL;
+		}
+	}
+	ret[i] = NULL;
+
+	return ret;
+}
+
+static int list_cmp(const char **el1, const char **el2)
+{
+	return strcmp(*el1, *el2);
+}
+
+/*
+  return a list that only contains the unique elements of a list,
+  removing any duplicates
+ */
+_PUBLIC_ char **str_list_unique(char **list)
+{
+	size_t len = str_list_length(list);
+	char **list2;
+	int i, j;
+	if (len < 2) {
+		return list;
+	}
+	list2 = (char **)talloc_memdup(list, list, sizeof(list[0])*(len+1));
+	qsort(list2, len, sizeof(list2[0]), QSORT_CAST list_cmp);
+	list[0] = list2[0];
+	for (i=j=1;i<len;i++) {
+		if (strcmp(list2[i], list[j-1]) != 0) {
+			list[j] = list2[i];
+			j++;
+		}
+	}
+	list[j] = NULL;
+	list = talloc_realloc(NULL, list, char *, j);
+	talloc_free(list2);
+	return list;
+}
+
+/*
+  very useful when debugging complex list related code
+ */
+_PUBLIC_ void str_list_show(const char **list)
+{
+	int i;
+	DEBUG(0,("{ "));
+	for (i=0;list && list[i];i++) {
+		DEBUG(0,("\"%s\", ", list[i]));
+	}
+	DEBUG(0,("}\n"));
+}
+
+
+
+/**
+  append one list to another - expanding list1
+  this assumes the elements of list2 are const pointers, so we can re-use them
+*/
+_PUBLIC_ char **str_list_append_const(char **list1, const char **list2)
+{
+	size_t len1 = str_list_length(list1);
+	size_t len2 = str_list_length(list2);
+	char **ret;
+	int i;
+
+	ret = talloc_realloc(NULL, list1, char *, len1+len2+1);
+	if (ret == NULL) return NULL;
+
+	for (i=len1;i<len1+len2;i++) {
+		ret[i] = list2[i-len1];
+	}
+	ret[i] = NULL;
+
+	return ret;
+}
+
+/**
+  add an entry to a string list
+  this assumes s will not change
+*/
+_PUBLIC_ char **str_list_add_const(char **list, const char *s)
+{
+	size_t len = str_list_length(list);
+	char **ret;
+
+	ret = talloc_realloc(NULL, list, char *, len+2);
+	if (ret == NULL) return NULL;
+
+	ret[len] = s;
+	ret[len+1] = NULL;
+
+	return ret;
+}
+
+/**
+  copy a string list
+  this assumes list will not change
+*/
+_PUBLIC_ char **str_list_copy_const(TALLOC_CTX *mem_ctx, const char **list)
+{
+	int i;
+	char **ret;
+
+	if (list == NULL)
+		return NULL;
+	
+	ret = talloc_array(mem_ctx, char *, str_list_length(list)+1);
+	if (ret == NULL) 
+		return NULL;
+
+	for (i=0;list && list[i];i++) {
+		ret[i] = list[i];
+	}
+	ret[i] = NULL;
+	return ret;
+}