2 files changed, 8 insertions, 3 deletions
diff --git a/fmt.c b/fmt.c
index f22fcce..0c47e00 100644
--- a/fmt.c
+++ b/fmt.c
@@ -7,11 +7,11 @@
 /* flawfinder: ignore. `alpha_digits` is never modified */
 static const char alpha_digits[26] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 void
-fmt_context_id(uint64_t num, char *out)
+fmt_context_id(uint64_t num, char *out, int withSeparator)
 {
 	/* flawfinder: ignore. bound checks are done */
 	char buf[BADWOLF_CTX_SIZ] = {0, 0, 0, 0, 0, 0, 0};
-	int len                   = 0;
+	int len                   = 2;
 
 	buf[++len] = alpha_digits[num % 26];
 	num /= 26;
@@ -25,4 +25,9 @@ fmt_context_id(uint64_t num, char *out)
 	{
 		out[i] = buf[len - i];
 	}
+
+	if (withSeparator) {
+		out[len - 2] = ':';
+		out[len - 1] = ' ';
+	}
 }
diff --git a/fmt.h b/fmt.h
index 1ac4a2b..06a13df 100644
--- a/fmt.h
+++ b/fmt.h
@@ -1,4 +1,4 @@
 #include <stdint.h> // uint64_t
 
 #define BADWOLF_CTX_SIZ 7
-void fmt_context_id(uint64_t num, char *out);
+void fmt_context_id(uint64_t num, char *out, int withSeparator);