mem: Add function to check whether memory ranges overlap

[ccan] / ccan / mem / test / api.c

diff --git a/ccan/mem/test/api.c b/ccan/mem/test/api.c
index d0178c355e06f7c139a94151f6c03fb083811a35..a584c0f33e3b97a11974e55e51670991db4a6bdd 100644 (file)
--- a/ccan/mem/test/api.c
+++ b/ccan/mem/test/api.c
@@ -11,7 +11,7 @@ int main(void)
        char scan2[] = "\0\0\0b";
 
        /* This is how many tests you plan to run */
-       plan_tests(46);
+       plan_tests(60);
 
        ok1(memmem(haystack1, sizeof(haystack1), needle1, 2) == haystack1);
        ok1(memmem(haystack1, sizeof(haystack1), needle1, 3) == NULL);
@@ -75,6 +75,27 @@ int main(void)
        ok1(!memends_str(S("a\0bcdef"), "a"));
        ok1(memends_str(S("a\0bcdef"), "ef"));
 
+       ok1(!memoverlaps(haystack1, sizeof(haystack1),
+                        haystack2, sizeof(haystack2)));
+       ok1(!memoverlaps(haystack2, sizeof(haystack2),
+                        haystack1, sizeof(haystack1)));
+       ok1(memoverlaps(haystack1, sizeof(haystack1), haystack1, 1));
+       ok1(memoverlaps(haystack1, 1, haystack1, sizeof(haystack1)));
+       ok1(memoverlaps(haystack1, sizeof(haystack1),
+                       haystack1 + sizeof(haystack1) - 1, 1));
+       ok1(memoverlaps(haystack1 + sizeof(haystack1) - 1, 1,
+                       haystack1, sizeof(haystack1)));
+       ok1(!memoverlaps(haystack1, sizeof(haystack1),
+                        haystack1 + sizeof(haystack1), 1));
+       ok1(!memoverlaps(haystack1 + sizeof(haystack1), 1,
+                        haystack1, sizeof(haystack1)));
+       ok1(!memoverlaps(haystack1, sizeof(haystack1), haystack1 - 1, 1));
+       ok1(!memoverlaps(haystack1 - 1, 1, haystack1, sizeof(haystack1)));
+       ok1(memoverlaps(haystack1, 5, haystack1 + 4, 7));
+       ok1(!memoverlaps(haystack1, 5, haystack1 + 5, 6));
+       ok1(memoverlaps(haystack1 + 4, 7, haystack1, 5));
+       ok1(!memoverlaps(haystack1 + 5, 6, haystack1, 5));
+
        /* This exits depending on whether all tests passed */
        return exit_status();
 }