From 9b2634a1e5d2ad7ce8e5bca58a5e793077ebabc0 Mon Sep 17 00:00:00 2001
From: Antonio SJ Musumeci <trapexit@spawn.link>
Date: Sat, 29 Feb 2020 16:38:31 -0500
Subject: [PATCH] fix name length calculation for musc

---
 libfuse/lib/fuse_dirents.c       | 24 ++++++++++++++++++++++--
 src/fuse_readdir_plus_posix.icpp | 15 ++++++++++++++-
 src/fuse_readdir_posix.icpp      | 15 ++++++++++++++-
 3 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/libfuse/lib/fuse_dirents.c b/libfuse/lib/fuse_dirents.c
index 629c6909..18b3a4d1 100644
--- a/libfuse/lib/fuse_dirents.c
+++ b/libfuse/lib/fuse_dirents.c
@@ -17,6 +17,26 @@
 
 #define DEFAULT_SIZE (1024 * 16)
 
+static
+uint64_t
+dirent_exact_namelen(const struct dirent *d_)
+{
+#ifdef _D_EXACT_NAMELEN
+  return _D_EXACT_NAMELEN(d_);
+#elif defined _DIRENT_HAVE_D_NAMLEN
+  return d_->d_namlen;
+#else
+  return strlen(d_->d_name);
+#endif
+}
+
+static
+uint64_t
+dirent_alloc_namelen(const struct dirent *d_)
+{
+  return (dirent_exact_namelen(d_) + 1);
+}
+
 static
 uint64_t
 align_uint64_t(uint64_t v_)
@@ -251,7 +271,7 @@ fuse_dirents_add(fuse_dirents_t      *d_,
       return -EINVAL;
     }
 
-  namelen = _D_ALLOC_NAMLEN(dirent_);
+  namelen = dirent_alloc_namelen(dirent_);
   size    = fuse_dirent_size(namelen);
 
   d = fuse_dirents_alloc(d_,size);
@@ -288,7 +308,7 @@ fuse_dirents_add_plus(fuse_dirents_t      *d_,
       break;
     }
 
-  namelen = _D_ALLOC_NAMLEN(dirent_);
+  namelen = dirent_alloc_namelen(dirent_);
   size    = fuse_direntplus_size(namelen);
 
   d = fuse_dirents_alloc(d_,size);
diff --git a/src/fuse_readdir_plus_posix.icpp b/src/fuse_readdir_plus_posix.icpp
index 966dec4d..4c9ebbf1 100644
--- a/src/fuse_readdir_plus_posix.icpp
+++ b/src/fuse_readdir_plus_posix.icpp
@@ -45,6 +45,19 @@ using std::vector;
 
 namespace l
 {
+  static
+  uint64_t
+  dirent_exact_namelen(const struct dirent *d_)
+  {
+#ifdef _D_EXACT_NAMELEN
+    return _D_EXACT_NAMELEN(d_);
+#elif defined _DIRENT_HAVE_D_NAMLEN
+    return d_->d_namlen;
+#else
+    return strlen(d_->d_name);
+#endif
+  }
+
   static
   int
   readdir_plus(const Branches &branches_,
@@ -83,7 +96,7 @@ namespace l
         rv = 0;
         for(struct dirent *de = fs::readdir(dh); de && !rv; de = fs::readdir(dh))
           {
-            rv = names.put(de->d_name,_D_EXACT_NAMLEN(de));
+            rv = names.put(de->d_name,l::dirent_exact_namelen(de));
             if(rv == 0)
               continue;
 
diff --git a/src/fuse_readdir_posix.icpp b/src/fuse_readdir_posix.icpp
index 4360297b..a653f9eb 100644
--- a/src/fuse_readdir_posix.icpp
+++ b/src/fuse_readdir_posix.icpp
@@ -44,6 +44,19 @@ using std::vector;
 
 namespace l
 {
+  static
+  uint64_t
+  dirent_exact_namelen(const struct dirent *d_)
+  {
+#ifdef _D_EXACT_NAMELEN
+    return _D_EXACT_NAMELEN(d_);
+#elif defined _DIRENT_HAVE_D_NAMLEN
+    return d_->d_namlen;
+#else
+    return strlen(d_->d_name);
+#endif
+  }
+
   static
   int
   readdir(const Branches &branches_,
@@ -74,7 +87,7 @@ namespace l
         rv = 0;
         for(struct dirent *de = fs::readdir(dh); de && !rv; de = fs::readdir(dh))
           {
-            rv = names.put(de->d_name,_D_EXACT_NAMLEN(de));
+            rv = names.put(de->d_name,l::dirent_exact_namelen(de));
             if(rv == 0)
               continue;