Introduce `git_strlist` to manage string lists

2 files changed, 111 insertions, 0 deletions

diff --git a/src/util/strlist.c b/src/util/strlist.c
new file mode 100644
index 000000000..8ba476812
--- /dev/null
+++ b/src/util/strlist.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include <stdio.h>
+
+#include "git2_util.h"
+#include "vector.h"
+#include "strlist.h"
+
+int git_strlist_copy_with_null(char ***out, const char **in, size_t len)
+{
+	char **dup;
+	size_t new_len, i;
+
+	GIT_ERROR_CHECK_ALLOC_ADD(&new_len, len, 1);
+
+	dup = git__calloc(new_len, sizeof(char *));
+	GIT_ERROR_CHECK_ALLOC(dup);
+
+	for (i = 0; i < len; i++) {
+		dup[i] = git__strdup(in[i]);
+		GIT_ERROR_CHECK_ALLOC(dup[i]);
+	}
+
+	*out = dup;
+	return 0;
+}
+
+bool git_strlist_contains_prefix(
+	const char **strings,
+	size_t len,
+	const char *str,
+	size_t n)
+{
+	size_t i;
+
+	for (i = 0; i < len; i++) {
+		if (strncmp(strings[i], str, n) == 0)
+			return true;
+	}
+
+	return false;
+}
+
+bool git_strlist_contains_key(
+	const char **strings,
+	size_t len,
+	const char *key,
+	char delimiter)
+{
+	const char *c;
+
+	for (c = key; *c; c++) {
+		if (*c == delimiter)
+			break;
+	}
+
+	return *c ?
+	       git_strlist_contains_prefix(strings, len, key, (c - key)) :
+	       false;
+}
+
+void git_strlist_free_with_null(char **strings)
+{
+	char **s;
+
+	if (!strings)
+		return;
+
+	for (s = strings; *s; s++)
+		git__free(*s);
+
+	git__free(strings);
+}
+
diff --git a/src/util/strlist.h b/src/util/strlist.h
new file mode 100644
index 000000000..c37afb4b6
--- /dev/null
+++ b/src/util/strlist.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#ifndef INCLUDE_runtime_h__
+#define INCLUDE_runtime_h__
+
+#include "git2_util.h"
+
+extern int git_strlist_copy_with_null(
+	char ***out,
+	const char **in,
+	size_t len);
+
+extern bool git_strlist_contains_prefix(
+	const char **strings,
+	size_t len,
+	const char *str,
+	size_t n);
+
+extern bool git_strlist_contains_key(
+	const char **strings,
+	size_t len,
+	const char *key,
+	char delimiter);
+
+extern void git_strlist_free_with_null(char **strings);
+
+#endif