libutil: add a string list helper to replace some of the adhoc ones

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 71 insertions, 0 deletions

diff --git a/lib/util/src/strlist.c b/lib/util/src/strlist.c
new file mode 100644
index 0000000..9d1fd78
--- /dev/null
+++ b/lib/util/src/strlist.c
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * strlist.c
+ *
+ * Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "util/strlist.h"
+#include "util/util.h"
+#include "compat.h"
+
+#include <stdlib.h>
+
+void strlist_cleanup(strlist_t *list)
+{
+	for (size_t i = 0; i < list->count; ++i)
+		free(list->strings[i]);
+
+	free(list->strings);
+	memset(list, 0, sizeof(*list));
+}
+
+int strlist_init_copy(strlist_t *dst, const strlist_t *src)
+{
+	memset(dst, 0, sizeof(*dst));
+
+	dst->strings = alloc_array(sizeof(char *), src->capacity);
+	if (dst->strings == NULL)
+		return -1;
+
+	dst->count = src->count;
+	dst->capacity = src->capacity;
+
+	for (size_t i = 0; i < src->count; ++i) {
+		dst->strings[i] = strdup(src->strings[i]);
+
+		if (dst->strings[i] == NULL) {
+			dst->count = i;
+			strlist_cleanup(dst);
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+int strlist_append(strlist_t *list, const char *str)
+{
+	if (list->count == list->capacity) {
+		size_t new_cap = list->capacity ? (list->capacity * 2) : 128;
+		size_t new_sz;
+		char **new;
+
+		if (SZ_MUL_OV(new_cap, sizeof(char *), &new_sz))
+			return -1;
+
+		new = realloc(list->strings, new_sz);
+		if (new == NULL)
+			return -1;
+
+		list->capacity = new_cap;
+		list->strings = new;
+	}
+
+	list->strings[list->count] = strdup(str);
+	if (list->strings[list->count] == NULL)
+		return -1;
+
+	list->count += 1;
+	return 0;
+}