Introduce `git_strlist` to manage string lists

src/util/strlist.c

@@ -28,6 +28,59 @@ int git_strlist_copy(char ***out, const char **in, size_t len)
 	return 0;
 }
 
+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(char **strings, size_t len)
 {
 	size_t i;
@@ -40,3 +93,16 @@ void git_strlist_free(char **strings, size_t len)
 
 	git__free(strings);
 }
+
+void git_strlist_free_with_null(char **strings)
+{
+	char **s;
+
+	if (!strings)
+		return;
+
+	for (s = strings; *s; s++)
+		git__free(*s);
+
+	git__free(strings);
+}

src/util/strlist.h

@@ -11,6 +11,26 @@
 #include "git2_util.h"
 
 extern int git_strlist_copy(char ***out, const char **in, size_t len);
+
+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(char **strings, size_t len);
 
+extern void git_strlist_free_with_null(char **strings);
+
 #endif