diff -r fcfe8c5e9fe1 -r 27e67e725d35 ucx/string.h
--- a/ucx/string.h	Thu Oct 11 08:42:56 2012 +0200
+++ b/ucx/string.h	Thu Oct 11 11:42:31 2012 +0200
@@ -46,7 +46,7 @@
  * s    string
  * ...  strings
  */
-size_t sstrnlen (size_t n, sstr_t s, ...);
+size_t sstrnlen (size_t n, const sstr_t s, ...);
 
 
 /*
@@ -56,18 +56,18 @@
  * s    new string with enough memory allocated
  * ...  strings
  */
-sstr_t sstrncat (size_t n, sstr_t s, sstr_t c1, ...);
+sstr_t sstrncat (size_t n, sstr_t s, const sstr_t c1, ...);
 
 
 /*
  *
  */
-sstr_t sstrsubs (sstr_t s, size_t start);
+sstr_t sstrsubs (const sstr_t s, size_t start);
 
 /*
  *
  */
-sstr_t sstrsubsl (sstr_t s, size_t start, size_t length);
+sstr_t sstrsubsl (const sstr_t s, size_t start, size_t length);
 
 /*
  * splits s into n parts
@@ -85,11 +85,11 @@
  *
  * Returns NULL on error
  */
-sstr_t* sstrsplit(sstr_t s, sstr_t d, size_t *n);
+sstr_t* sstrsplit(const sstr_t s, const sstr_t d, size_t *n);
 
-int sstrcmp(sstr_t s1, sstr_t s2);
+int sstrcmp(const sstr_t s1, const sstr_t s2);
 
-sstr_t sstrdup(sstr_t s);
+sstr_t sstrdup(const sstr_t s);
 
 #ifdef	__cplusplus
 }