preliminary work for the configuration parser.

[apps/madmutt.git] / lib-lib / str.h

diff --git a/lib-lib/str.h b/lib-lib/str.h
index 1beac83..0136569 100644 (file)
--- a/lib-lib/str.h
+++ b/lib-lib/str.h
@@ -94,6 +94,16 @@ extern char const __m_b36chars_upper[36];
 /* conversions                                                              */
 /****************************************************************************/
 
+/** \brief Converts an octal digit into an int.
+ * \param[in]  c    the octal char
+ * \return
+ *   - 0–7 if c is a valid octal digit,
+ *   - -1 on error.
+ */
+static inline int octval(int c) {
+    return !(c & ~127) && __m_strdigits[c] < 7 ? __m_strdigits[c] : -1;
+}
+
 /** \brief Converts an hexadecimal digit into an int.
  * \param[in]  c    the hexadecimal char
  * \return