Use message index instead of URL to save space

Refresh code is not maintained.

1 files changed, 28 insertions, 0 deletions

diff --git a/utils.c b/utils.c
new file mode 100644
index 0000000..8215174
--- /dev/null
+++ b/utils.c
@@ -0,0 +1,28 @@
+/*
+ * Created by yuuta on 3/19/23.
+ */
+
+#include "utils.h"
+
+#include <inttypes.h>
+#include <string.h>
+#include <errno.h>
+#include <stdint.h>
+
+uint32_t tg_url_get_index(const char *url) {
+    char *tok = strrchr(url, '/');
+
+    if (!tok) {
+        return 0;
+    }
+
+    char *endptr;
+    uintmax_t unum = strtoumax(tok + 1, &endptr, 10);
+    if (strcmp(endptr, "") != 0 || (unum == UINTMAX_MAX && errno == ERANGE)) {
+        return 0;
+    }
+    if (unum > UINT32_MAX) {
+        return 0;
+    }
+    return (uint32_t) unum;
+}