strset: allow const arguments to strset_iterate().

[ccan] / ccan / strset / strset.c

diff --git a/ccan/strset/strset.c b/ccan/strset/strset.c
index 7c64b0cd016631017024da239cc29ad7e5470ec0..8b38ba2978f617dc4d018c045ab4c8b236bedb87 100644 (file)
--- a/ccan/strset/strset.c
+++ b/ccan/strset/strset.c
@@ -61,12 +61,13 @@ char *strset_test(const struct strset *set, const char *member)
 {
        const char *str;
 
-       /* Empty set? */
-       if (!set->u.n)
-               return NULL;
-       str = closest(*set, member);
-       if (streq(member, str))
-               return (char *)str;
+       /* Non-empty set? */
+       if (set->u.n) {
+               str = closest(*set, member);
+               if (streq(member, str))
+                       return (char *)str;
+       }
+       errno = ENOENT;
        return NULL;
 }
 
@@ -171,8 +172,10 @@ char *strset_clear(struct strset *set, const char *member)
        u8 direction = 0; /* prevent bogus gcc warning. */
 
        /* Empty set? */
-       if (!set->u.n)
+       if (!set->u.n) {
+               errno = ENOENT;
                return NULL;
+       }
 
        /* Find closest, but keep track of parent. */
        n = set;
@@ -184,8 +187,10 @@ char *strset_clear(struct strset *set, const char *member)
                if (unlikely(n->u.n->byte_num == (size_t)-1)) {
                        const char *empty_str = n->u.n->child[0].u.s;
 
-                       if (member[0])
+                       if (member[0]) {
+                               errno = ENOENT;
                                return NULL;
+                       }
 
                        /* Sew empty string back so remaining logic works */
                        free(n->u.n);
@@ -203,8 +208,10 @@ char *strset_clear(struct strset *set, const char *member)
        }
 
        /* Did we find it? */
-       if (!streq(member, n->u.s))
+       if (!streq(member, n->u.s)) {
+               errno = ENOENT;
                return NULL;
+       }
 
        ret = n->u.s;
 
@@ -222,19 +229,19 @@ char *strset_clear(struct strset *set, const char *member)
 }
 
 static bool iterate(struct strset n,
-                   bool (*handle)(const char *, void *), void *data)
+                   bool (*handle)(const char *, void *), const void *data)
 {
        if (n.u.s[0])
-               return handle(n.u.s, data);
+               return handle(n.u.s, (void *)data);
        if (unlikely(n.u.n->byte_num == (size_t)-1))
-               return handle(n.u.n->child[0].u.s, data);
+               return handle(n.u.n->child[0].u.s, (void *)data);
 
        return iterate(n.u.n->child[0], handle, data)
                || iterate(n.u.n->child[1], handle, data);
 }
 
 void strset_iterate_(const struct strset *set,
-                    bool (*handle)(const char *, void *), void *data)
+                    bool (*handle)(const char *, void *), const void *data)
 {
        /* Empty set? */
        if (!set->u.n)