Merge branch 'collectd-5.8'

[collectd.git] / contrib / docker / rootfs_prefix / rootfs_prefix.c

diff --git a/contrib/docker/rootfs_prefix/rootfs_prefix.c b/contrib/docker/rootfs_prefix/rootfs_prefix.c
index d41f062..fdacf74 100644 (file)
--- a/contrib/docker/rootfs_prefix/rootfs_prefix.c
+++ b/contrib/docker/rootfs_prefix/rootfs_prefix.c
@@ -1,63 +1,88 @@
+/**
+ * collectd - contrib/docker/rootfs_prefix/rootfs_prefix.c
+ * Copyright (C) 2016-2018  Marc Fournier
+ * Copyright (C) 2016-2018  Ruben Kerkhof
+ *
+ * MIT License:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *   Marc Fournier <marc.fournier at camptocamp.com>
+ *   Ruben Kerkhof <ruben at rubenkerkhof.com>
+ **/
+
 #define _GNU_SOURCE
 
-#include <stdio.h>
-#include <error.h>
+#include <dirent.h>
 #include <dlfcn.h>
-#include <string.h>
 #include <errno.h>
-#include <dirent.h>
+#include <error.h>
+#include <stdio.h>
+#include <string.h>
 
 #define PREFIX "/rootfs"
 #define BUFSIZE 256
 
 const char *add_prefix(const char *orig, char *prefixed) {
-       int status;
-       int errno;
-
-       if ((strncmp(orig, "/proc", 5) == 0) ||
-               (strncmp(orig, "/sys", 4) == 0)) {
-
-               status = snprintf(prefixed, BUFSIZE, "%s%s", PREFIX, orig);
-               if ((unsigned int)status >= BUFSIZE) {
-                       error(status, ENAMETOOLONG, "'%s' got truncated when adding '%s' prefix: '%s'",
-                               orig, PREFIX, prefixed);
-                       return orig;
-               } else if (status < 1) {
-                       error(status, errno, "adding '%s' prefix to file path failed: '%s' -> '%s'",
-                               PREFIX, orig, prefixed);
-                       return orig;
-               } else {
-                       return (const char*) prefixed;
-               }
-
-       } else {
-               return orig;
-       }
+  if ((strncmp(orig, "/proc", strlen("/proc")) != 0) &&
+      (strncmp(orig, "/sys", strlen("/sys")) != 0))
+    return orig;
+
+  int status = snprintf(prefixed, BUFSIZE, "%s%s", PREFIX, orig);
+  if (status < 1) {
+    error(status, errno, "adding '%s' prefix to file path failed: '%s' -> '%s'",
+          PREFIX, orig, prefixed);
+    return orig;
+  } else if ((unsigned int)status >= BUFSIZE) {
+    error(status, ENAMETOOLONG,
+          "'%s' got truncated when adding '%s' prefix: '%s'", orig, PREFIX,
+          prefixed);
+    return orig;
+  } else {
+    return (const char *)prefixed;
+  }
 }
 
 FILE *fopen(const char *path, const char *mode) {
-       char filename[BUFSIZE] = "\0";
+  char filename[BUFSIZE] = "\0";
 
-       FILE *(*original_fopen)(const char*, const char*);
-       original_fopen = dlsym(RTLD_NEXT, "fopen");
+  FILE *(*original_fopen)(const char *, const char *);
+  original_fopen = dlsym(RTLD_NEXT, "fopen");
 
-       return (*original_fopen)(add_prefix(path, filename), mode);
+  return (*original_fopen)(add_prefix(path, filename), mode);
 }
 
 DIR *opendir(const char *name) {
-       char filename[BUFSIZE] = "\0";
+  char filename[BUFSIZE] = "\0";
 
-       DIR *(*original_opendir)(const char*);
-       original_opendir = dlsym(RTLD_NEXT, "opendir");
+  DIR *(*original_opendir)(const char *);
+  original_opendir = dlsym(RTLD_NEXT, "opendir");
 
-       return (*original_opendir)(add_prefix(name, filename));
+  return (*original_opendir)(add_prefix(name, filename));
 }
 
 int *open(const char *pathname, int flags) {
-       char filename[BUFSIZE] = "\0";
+  char filename[BUFSIZE] = "\0";
 
-       int *(*original_open)(const char*, int);
-       original_open = dlsym(RTLD_NEXT, "open");
+  int *(*original_open)(const char *, int);
+  original_open = dlsym(RTLD_NEXT, "open");
 
-       return (*original_open)(add_prefix(pathname, filename), flags);
+  return (*original_open)(add_prefix(pathname, filename), flags);
 }