use size_t as return type

README.md

@@ -2,7 +2,7 @@
 Lightweight ISO-6937 to UTF-8 conversion library.
 
 ### SYNOPSIS
-> int xconv(char \*inbuf, char \*outbuf, size\_t outbuflen);
+> size\_t xconv(char \*inbuf, char \*outbuf, size\_t outbuflen);
 
 ### DESCRIPTION
 

xconv.c

@@ -61,7 +61,7 @@ is_utf_sequence(char *s)
 	return 1;
 }
 
-int
+size_t
 xconv(char *src, char *dst, size_t dstlen)
 {
 	size_t len = dstlen - 1;

xconv.h

@@ -1,3 +1,7 @@
 
-int xconv(char *, char *, size_t);
+#ifndef _XCONV_H
+
+size_t xconv(char *, char *, size_t);
+
+#endif