be independent with new write_make_symlink function

src/lib66/write/write_make_symlink.c

+/*
+ * write_make_symlink.c
+ *
+ * Copyright (c) 2018-2021 Eric Vidal <eric@obarun.org>
+ *
+ * All rights reserved.
+ *
+ * This file is part of Obarun. It is subject to the license terms in
+ * the LICENSE file found in the top-level directory of this
+ * distribution.
+ * This file may not be copied, modified, propagated, or distributed
+ * except according to the terms contained in the LICENSE file./
+ */
+
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/errno.h>
+
+#include <oblibs/log.h>
+#include <oblibs/string.h>
+
+#include <66/service.h>
+#include <66/constants.h>
+
+void write_make_symlink(resolve_service_t *res)
+{
+    log_flow() ;
+
+    int r ;
+    struct stat st ;
+    char *name = res->sa.s + res->name ;
+    size_t namelen = strlen(name), homelen = strlen(res->sa.s + res->path.home) ;
+
+    char sym[homelen + SS_SYSTEM_LEN + SS_RESOLVE_LEN + SS_SERVICE_LEN + 1 + namelen + 1] ;
+    char dst[homelen + SS_SYSTEM_LEN + SS_SERVICE_LEN + SS_SVC_LEN + SS_RESOLVE_LEN + 1 + namelen + 1] ;
+
+    auto_strings(sym, res->sa.s + res->path.home, SS_SYSTEM, SS_RESOLVE, SS_SERVICE, "/", name) ;
+
+    auto_strings(dst, res->sa.s + res->path.home, SS_SYSTEM, SS_SERVICE, SS_SVC, "/", name) ;
+
+    r = lstat(sym, &st) ;
+    if (r < 0) {
+
+        if (errno != ENOENT) {
+
+            log_dieusys(LOG_EXIT_SYS, "lstat: ", sym) ;
+
+        } else {
+
+            log_trace("symlink: ", sym, " to: ", dst) ;
+            r = symlink(dst, sym) ;
+            if (r < 0 && errno != EEXIST)
+                log_dieusys(LOG_EXIT_SYS, "point symlink: ", sym, " to: ", dst) ;
+        }
+    }
+}
\ No newline at end of file