1 files changed, 34 insertions, 0 deletions
diff --git a/t/helper/test-genzeros.c b/t/helper/test-genzeros.c
new file mode 100644
index 0000000..8ca988d
--- /dev/null
+++ b/t/helper/test-genzeros.c
@@ -0,0 +1,34 @@
+#include "test-tool.h"
+#include "git-compat-util.h"
+
+int cmd__genzeros(int argc, const char **argv)
+{
+	/* static, so that it is NUL-initialized */
+	static const char zeros[256 * 1024];
+	intmax_t count;
+	ssize_t n;
+
+	if (argc > 2) {
+		fprintf(stderr, "usage: %s [<count>]\n", argv[0]);
+		return 1;
+	}
+
+	count = argc > 1 ? strtoimax(argv[1], NULL, 0) : -1;
+
+	/* Writing out individual NUL bytes is slow... */
+	while (count < 0)
+		if (write(1, zeros, ARRAY_SIZE(zeros)) < 0)
+			return -1;
+
+	while (count > 0) {
+		n = write(1, zeros, count < ARRAY_SIZE(zeros) ?
+			  count : ARRAY_SIZE(zeros));
+
+		if (n < 0)
+			return -1;
+
+		count -= n;
+	}
+
+	return 0;
+}