1 files changed, 156 insertions, 0 deletions
diff --git a/test/mocklibc/src/grp.c b/test/mocklibc/src/grp.c
new file mode 100644
index 0000000..c671e1f
--- /dev/null
+++ b/test/mocklibc/src/grp.c
@@ -0,0 +1,156 @@
+/**
+ * Copyright 2011 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Author: Nikki VonHollen <vonhollen@gmail.com>
+ */
+
+#include <grp.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+#define GROUP_CONFIG_KEY "MOCK_GROUP"
+
+static FILE *global_stream = NULL;
+
+void setgrent(void) {
+  if (global_stream)
+    endgrent();
+
+  const char *path = getenv(GROUP_CONFIG_KEY);
+  if (!path)
+    return;
+
+  global_stream = fopen(path, "r");
+}
+
+struct group *getgrent(void) {
+  if (!global_stream)
+    setgrent();
+
+  if (!global_stream)
+    return NULL;
+
+  return fgetgrent(global_stream);
+}
+
+void endgrent(void) {
+  if (!global_stream)
+    return;
+
+  fclose(global_stream);
+  global_stream = NULL;
+}
+
+struct group *getgrnam(const char *name) {
+  const char *path = getenv(GROUP_CONFIG_KEY);
+  if (!path)
+    return NULL;
+
+  FILE *stream = fopen(path, "r");
+  if (!stream)
+    return NULL;
+
+  struct group *entry;
+  while ((entry = fgetgrent(stream))) {
+    if (strcmp(entry->gr_name, name) == 0) {
+      fclose(stream);
+      return entry;
+    }
+  }
+
+  fclose(stream);
+  return NULL;
+}
+
+struct group *getgrgid(gid_t gid) {
+  const char *path = getenv(GROUP_CONFIG_KEY);
+  if (!path)
+    return NULL;
+
+  FILE *stream = fopen(path, "r");
+  if (!stream)
+    return NULL;
+
+  struct group *entry;
+  while ((entry = fgetgrent(stream))) {
+    if (entry->gr_gid == gid) {
+      fclose(stream);
+      return entry;
+    }
+  }
+
+  fclose(stream);
+  return NULL;
+}
+
+int getgrouplist(const char *user, gid_t group, gid_t *groups, int *ngroups) {
+  const char *path = getenv(GROUP_CONFIG_KEY);
+  if (!path) {
+    *ngroups = 0;
+    return -1;
+  }
+
+  FILE *stream = fopen(path, "r");
+  if (!stream) {
+    *ngroups = 0;
+    return -1;
+  }
+
+  int default_group_found = 0;
+  int groups_found = 0;
+
+  // Loop through all groups
+  struct group *entry;
+  while ((entry = fgetgrent(stream))) {
+    // Loop through all users in group
+    char **cur_user;
+    for (cur_user = entry->gr_mem; *cur_user; cur_user++) {
+      // Skip users who don't match arg 'user'
+      if (strcmp(*cur_user, user))
+        continue;
+
+      // Is this the default group? if so, flag it
+      if (entry->gr_gid == group)
+        default_group_found = 1;
+
+      // Only insert new entries if we have room
+      if (groups_found < *ngroups) {
+        groups[groups_found] = entry->gr_gid;
+      }
+
+      groups_found++;
+    }
+  }
+
+  // Include the default group if it wasn't found
+  if (!default_group_found) {
+    if (groups_found < *ngroups) {
+      groups[groups_found] = group;
+    }
+    groups_found++;
+  }
+
+  // Did we have to leave out some groups? If not, tell how many we found.
+  int retval = (groups_found > *ngroups) ? -1 : groups_found;
+
+  // Always tell the user how many groups we found via *ngroups
+  *ngroups = groups_found;
+
+  fclose(stream);
+  return retval;
+}