Add test for get_or_add for linkmap

linkmap.c

@@ -150,7 +150,7 @@ char* haggis_linkmap_get_or_add(haggis_linkmap *map, ino_t inode, char * path) {
         ino_t val;
         u8 bytes[sizeof(ino_t)];
     } key;
-    char * target = "";
+    char * target = NULL;
     size_t idx, hash;
     haggis_bucket *b;
 
@@ -159,9 +159,10 @@ char* haggis_linkmap_get_or_add(haggis_linkmap *map, ino_t inode, char * path) {
         haggis_linkmap_expand(map);
     key.val = inode;
     hash = hash_fnv1a_64(key.bytes, sizeof(ino_t));
-    idx = map->capacity % hash;
+    idx = hash % map->capacity;
     if (map->buckets[idx].key.val == inode) {
-        target = strndup(target, PATH_MAX - 1);
+        target = strndup(map->buckets[idx].path, PATH_MAX - 1);
+        map->buckets[idx].path = path;
     } else if (map->buckets[idx].key.val == 0) {
         map->buckets[idx].key.val = inode;
         map->buckets[idx].hash = hash;

test/Makefile

@@ -62,6 +62,7 @@ tests      += load_file_sha256
 tests      += fnv1a_hash_inode
 tests      += fnv1a_hash_str
 tests      += linkmap_init
+tests      += linkmap_put
 
 total      != echo $(tests) | wc -w | awk '{ print $$1 }'
 

test/linkmap_put.c

@@ -0,0 +1,33 @@
+#include <assert.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include "haggis.h"
+#include "haggis_private.h"
+
+int main() {
+    haggis_linkmap *map;
+    struct stat s0, s1;
+    char *path;
+    char *tgt = "Makefile";
+    char *lnk = "output/Makefile";
+
+    map = haggis_linkmap_init();
+    assert(map != NULL);
+    assert(stat(tgt, &s0) == 0);
+
+    if (access(lnk, AT_EACCESS) != 0)
+        link(tgt, lnk);
+
+    assert(stat(lnk, &s1) == 0);
+    path = haggis_linkmap_get_or_add(map, s0.st_ino, tgt);
+    assert(path == NULL);
+    path = haggis_linkmap_get_or_add(map, s1.st_ino, lnk);
+    //printf("\nPath: %s\n", path);
+    assert(memcmp(path, tgt, 9) == 0);
+    haggis_linkmap_deinit(map);
+    unlink(lnk);
+}