mingw: Add missing misc/mingw-access.c and misc/ucrt-access.c

lib/libc/mingw/misc/mingw-access.c

@@ -0,0 +1,54 @@
+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the mingw-w64 runtime package.
+ * No warranty is given; refer to the file DISCLAIMER.PD within this package.
+ */
+#include <windows.h>
+#include <errno.h>
+#include <io.h>
+
+int __cdecl __mingw_access(const char *fname, int mode);
+
+int __cdecl __mingw_access(const char *fname, int mode)
+{
+  DWORD attr;
+
+  if (fname == NULL || (mode & ~(F_OK | X_OK | W_OK | R_OK)))
+  {
+    errno = EINVAL;
+    return -1;
+  }
+
+  attr = GetFileAttributesA(fname);
+  if (attr == INVALID_FILE_ATTRIBUTES)
+  {
+    switch (GetLastError())
+    {
+      case ERROR_FILE_NOT_FOUND:
+      case ERROR_PATH_NOT_FOUND:
+        errno = ENOENT;
+        break;
+      case ERROR_ACCESS_DENIED:
+        errno = EACCES;
+        break;
+      default:
+        errno = EINVAL;
+    }
+    return -1;
+  }
+
+  if (attr & FILE_ATTRIBUTE_DIRECTORY)
+  {
+    /* All directories have read & write access */
+    return 0;
+  }
+
+  if ((attr & FILE_ATTRIBUTE_READONLY) && (mode & W_OK))
+  {
+    /* no write permission on file */
+    errno = EACCES;
+    return -1;
+  }
+  else
+    return 0;
+}

lib/libc/mingw/misc/ucrt-access.c

@@ -0,0 +1,19 @@
+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the mingw-w64 runtime package.
+ * No warranty is given; refer to the file DISCLAIMER.PD within this package.
+ */
+
+#include <io.h>
+
+int __cdecl __mingw_access(const char *fname, int mode);
+
+int __cdecl access(const char *fname, int mode)
+{
+  /* On UCRT, unconditionally forward access to __mingw_access. UCRT's
+   * access() function return an error if passed the X_OK constant,
+   * while msvcrt.dll's access() doesn't. (It's reported that msvcrt.dll's
+   * access() also returned errors on X_OK in the version shipped in Vista,
+   * but in recent tests it's no longer the case.) */
+  return __mingw_access(fname, mode);
+}

src/mingw.zig

@@ -697,6 +697,7 @@ const mingwex_generic_src = [_][]const u8{
     "misc" ++ path.sep_str ++ "mbrtowc.c",
     "misc" ++ path.sep_str ++ "mbsinit.c",
     "misc" ++ path.sep_str ++ "mempcpy.c",
+    "misc" ++ path.sep_str ++ "mingw-access.c",
     "misc" ++ path.sep_str ++ "mingw-aligned-malloc.c",
     "misc" ++ path.sep_str ++ "mingw_getsp.S",
     "misc" ++ path.sep_str ++ "mingw_matherr.c",
@@ -716,6 +717,7 @@ const mingwex_generic_src = [_][]const u8{
     "misc" ++ path.sep_str ++ "tfind.c",
     "misc" ++ path.sep_str ++ "tsearch.c",
     "misc" ++ path.sep_str ++ "twalk.c",
+    "misc" ++ path.sep_str ++ "ucrt-access.c",
     "misc" ++ path.sep_str ++ "wcrtomb.c",
     "misc" ++ path.sep_str ++ "wcsnlen.c",
     "misc" ++ path.sep_str ++ "wcstof.c",