Add ZixDirEntryVisitFunc

Although this type is only used once in the API, define it to avoid the
complicated syntax of inline function pointer parameters, which confuses both
people and clang-format.

3 files changed, 20 insertions, 15 deletions

diff --git a/include/zix/filesystem.h b/include/zix/filesystem.h
index 84d7206..dff4145 100644
--- a/include/zix/filesystem.h
+++ b/include/zix/filesystem.h
@@ -154,6 +154,17 @@ zix_remove(const char* ZIX_NONNULL path);
 */
 
 /**
+   Function for reading input bytes from a stream.
+
+   @param path Path to the directory being visited.
+   @param name Name of the directory entry.
+   @param data Opaque user data.
+*/
+typedef void (*ZixDirEntryVisitFunc)(const char* ZIX_NONNULL path,
+                                     const char* ZIX_NONNULL name,
+                                     void* ZIX_NONNULL       data);
+
+/**
    Visit every file in the directory at `path`.
 
    @param path A path to a directory.
@@ -165,11 +176,9 @@ zix_remove(const char* ZIX_NONNULL path);
    parameter is the name of the directory entry (not its full path).
 */
 ZIX_API void
-zix_dir_for_each(const char* ZIX_NONNULL path,
-                 void* ZIX_NULLABLE      data,
-                 void (*ZIX_NONNULL f)(const char* ZIX_NONNULL path,
-                                       const char* ZIX_NONNULL name,
-                                       void* ZIX_NONNULL       data));
+zix_dir_for_each(const char* ZIX_NONNULL          path,
+                 void* ZIX_NULLABLE               data,
+                 ZixDirEntryVisitFunc ZIX_NONNULL f);
 
 /**
    Return whether the given paths point to files with identical contents.
diff --git a/src/posix/filesystem_posix.c b/src/posix/filesystem_posix.c
index 7553916..2ee323a 100644
--- a/src/posix/filesystem_posix.c
+++ b/src/posix/filesystem_posix.c
@@ -300,11 +300,9 @@ zix_remove(const char* const path)
 }
 
 void
-zix_dir_for_each(const char* const path,
-                 void* const       data,
-                 void (*const f)(const char* path,
-                                 const char* name,
-                                 void*       data))
+zix_dir_for_each(const char* const          path,
+                 void* const                data,
+                 const ZixDirEntryVisitFunc f)
 {
   DIR* dir = opendir(path);
   if (dir) {
diff --git a/src/win32/filesystem_win32.c b/src/win32/filesystem_win32.c
index 196818b..235ee0f 100644
--- a/src/win32/filesystem_win32.c
+++ b/src/win32/filesystem_win32.c
@@ -172,11 +172,9 @@ zix_remove(const char* const path)
 }
 
 void
-zix_dir_for_each(const char* const path,
-                 void* const       data,
-                 void (*const f)(const char* path,
-                                 const char* name,
-                                 void*       data))
+zix_dir_for_each(const char* const          path,
+                 void* const                data,
+                 const ZixDirEntryVisitFunc f)
 {
   static const TCHAR* const dot    = TEXT(".");
   static const TCHAR* const dotdot = TEXT("..");