Update copyright years

[nsscash/nsscash.git] / nss / file.c

diff --git a/nss/file.c b/nss/file.c
index 30ea4f9b5f96910f0cd0ba8d353cfa7dbccea076..cdbbde5cea176138d4f9bc3282d223a603ef4323 100644 (file)
--- a/nss/file.c
+++ b/nss/file.c
@@ -1,7 +1,7 @@
 /*
  * Load and unload nsscash files
  *
- * Copyright (C) 2019  Simon Ruderich
+ * Copyright (C) 2019-2021  Simon Ruderich
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -31,10 +31,7 @@
 
 bool map_file(const char *path, struct file *f) {
     // Fully initialize the struct for unmap_file() and other users
-    f->fd = -1;
-    f->size = 0;
-    f->next_index = 0;
-    f->header = NULL;
+    memset(f, 0, sizeof(*f));
 
     f->fd = open(path, O_RDONLY | O_CLOEXEC);
     if (f->fd < 0) {
@@ -44,8 +41,9 @@ bool map_file(const char *path, struct file *f) {
     if (fstat(f->fd, &s)) {
         goto fail;
     }
-    f->size = (size_t)s.st_size;
+    f->size = (size_t)s.st_size; // for munmap()
 
+    // mmap is used for speed and simple random access
     void *x = mmap(NULL, f->size, PROT_READ, MAP_PRIVATE, f->fd, 0);
     if (x == MAP_FAILED) {
         goto fail;
@@ -81,7 +79,7 @@ void unmap_file(struct file *f) {
         munmap((void *)f->header, f->size);
         f->header = NULL;
     }
-    if (f->fd != -1) {
+    if (f->fd >= 0) {
         close(f->fd);
         f->fd = -1;
     }