Add a dedicated ranged unsigned int scanner and a bencoded variant

1 files changed, 21 insertions, 0 deletions

diff --git a/ot_scan.h b/ot_scan.h
new file mode 100644
index 0000000..860a088
--- /dev/null
+++ b/ot_scan.h
@@ -0,0 +1,21 @@
+/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
+   It is considered beerware. Prost. Skol. Cheers or whatever.
+
+   $id$ */
+
+#ifndef OT_SCAN_H__
+#define OT_SCAN_H__
+
+#include <stddef.h>
+#include <stdint.h>
+
+/* Read an unsigned decimal number from src into dest and return how many
+   characters were consumed. Returns zero and leaves dest untouched when src
+   does not begin with a digit, or when the value would exceed max. */
+size_t scan_udec(const char *src, uint64_t *dest, uint64_t max);
+
+/* As scan_udec, but following the bencode integer grammar, which permits a
+   leading zero on zero alone. */
+size_t scan_udec_bencode(const char *src, uint64_t *dest, uint64_t max);
+
+#endif