1 files changed, 66 insertions, 0 deletions
diff --git a/src/util/staticstr.h b/src/util/staticstr.h
new file mode 100644
index 000000000..b7d0790c4
--- /dev/null
+++ b/src/util/staticstr.h
@@ -0,0 +1,66 @@
+/*
+ * 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_stackstr_h__
+#define INCLUDE_stackstr_h__
+
+#include "git2_util.h"
+
+typedef struct {
+	/* Length of / number of bytes used by `data`. */
+	size_t len;
+
+	/* Size of the allocated `data` buffer. */
+	size_t size;
+
+	/* The actual string buffer data. */
+	char data[GIT_FLEX_ARRAY];
+} git_staticstr;
+
+#define git_staticstr_with_size(__size) \
+	struct { \
+		size_t len; \
+		size_t size; \
+		char data[__size]; \
+	}
+
+#define git_staticstr_init(__str, __size) \
+	do { \
+		(__str)->len = 0; \
+		(__str)->size = __size; \
+		(__str)->data[0] = '\0'; \
+	} while(0)
+
+#define git_staticstr_offset(__str) \
+	((__str)->data + (__str)->len)
+
+#define git_staticstr_remain(__str) \
+	((__str)->len > (__str)->size ? 0 : ((__str)->size - (__str)->len))
+
+#define git_staticstr_increase(__str, __len) \
+	do { ((__str)->len += __len); } while(0)
+
+#define git_staticstr_consume_bytes(__str, __len) \
+	do { git_staticstr_consume(__str, (__str)->data + __len); } while(0)
+
+#define git_staticstr_consume(__str, __end) \
+	do { \
+		if (__end > (__str)->data && \
+		    __end <= (__str)->data + (__str)->len) { \
+			size_t __consumed = __end - (__str)->data; \
+			memmove((__str)->data, __end, (__str)->len - __consumed); \
+			(__str)->len -= __consumed; \
+			(__str)->data[(__str)->len] = '\0'; \
+		} \
+	} while(0)
+
+#define git_staticstr_clear(__str) \
+	do { \
+		(__str)->len = 0; \
+		(__str)->data[0] = 0; \
+	} while(0)
+
+#endif