1 files changed, 10 insertions, 0 deletions
diff --git a/zahl.h b/zahl.h
index 18c0d7a..993d7b1 100644
--- a/zahl.h
+++ b/zahl.h
@@ -25,6 +25,10 @@ enum zprimality { NONPRIME = 0, PROBABLY_PRIME, PRIME };
 enum zranddev { FAST_RANDOM = 0, SECURE_RANDOM };
 enum zranddist { QUASIUNIFORM = 0, UNIFORM };
 
+enum zerror {
+	ZERROR_ERRNO_SET = 0
+};
+
 
 
 /* The parameters in the functions below are numbers a, b, c, ... */
@@ -128,6 +132,12 @@ int zsets(z_t, const char *);          /* a := b */
 size_t zstr_length(z_t, unsigned long long int);
 
 
+/* Error handling functions. */
+
+enum zerror zerror(const char **);     /* Return the current error code, and unless a is 0, a description in *a. */
+void zperror(const char *);            /* Identical to perror(3p) except it supports libzahl errors. */
+
+
 /* Inline functions. */
 
 static inline int zeven(z_t a)         { return !a->sign || !(a->chars[0] & 1); } /* Is a even? */