fmt: Grab fmt_context_id for tests

1 files changed, 31 insertions, 0 deletions

diff --git a/fmt.c b/fmt.c
new file mode 100644
index 0000000..a88e8cb
--- /dev/null
+++ b/fmt.c
@@ -0,0 +1,31 @@
+// BadWolf: Minimalist and privacy-oriented WebKitGTK+ browser
+// Copyright © 2019-2021 Badwolf Authors <https://hacktivis.me/projects/badwolf>
+// SPDX-License-Identifier: BSD-3-Clause
+
+#include "fmt.h"
+
+/* flawfinder: ignore. `alpha_digits` is never modified */
+static const char alpha_digits[26] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+void
+fmt_context_id(uint64_t num, char *out)
+{
+	/* flawfinder: ignore. bound checks are done */
+	char buf[BADWOLF_CTX_SIZ] = {0, 0, 0, 0, 0, 0, 0};
+	int len                   = 0;
+
+	buf[++len] = ' ';
+	buf[++len] = ':';
+
+	buf[++len] = alpha_digits[num % 26];
+	num /= 26;
+	while(num > 0 && len < (BADWOLF_CTX_SIZ - 1))
+	{
+		buf[++len] = alpha_digits[(num - 1) % 26];
+		num /= 26;
+	}
+
+	for(int i = 0; i < len; i++)
+	{
+		out[i] = buf[len - i];
+	}
+}