implemented os_file_get_size()

src/diff.c

@@ -863,8 +863,6 @@ void ex_diffpatch(exarg_T *eap)
   char_u dirbuf[MAXPATHL];
   char_u *fullname = NULL;
 #endif  // ifdef UNIX
-  struct stat st;
-
   // We need two temp file names.
   // Name of original temp file.
   char_u *tmp_orig = vim_tempname('o');
@@ -965,7 +963,9 @@ void ex_diffpatch(exarg_T *eap)
   os_remove((char *)buf);
 
   // Only continue if the output file was created.
-  if ((mch_stat((char *)tmp_new, &st) < 0) || (st.st_size == 0)) {
+  off_t file_size;
+  bool file_size_success = os_get_file_size((char *)tmp_new, &file_size);
+  if (!file_size_success || file_size == 0) {
     EMSG(_("E816: Cannot read patch output"));
   } else {
     if (curbuf->b_fname != NULL) {

src/eval.c

@@ -9687,25 +9687,25 @@ static void f_getfperm(typval_T *argvars, typval_T *rettv)
  */
 static void f_getfsize(typval_T *argvars, typval_T *rettv)
 {
-  char_u      *fname;
-  struct stat st;
-
-  fname = get_tv_string(&argvars[0]);
+  char *fname = (char *)get_tv_string(&argvars[0]);
 
   rettv->v_type = VAR_NUMBER;
 
-  if (mch_stat((char *)fname, &st) >= 0) {
-    if (os_isdir(fname))
+  off_t file_size;
+  if (os_get_file_size(fname, &file_size)) {
+    if (os_isdir((char_u *)fname))
       rettv->vval.v_number = 0;
     else {
-      rettv->vval.v_number = (varnumber_T)st.st_size;
+      rettv->vval.v_number = (varnumber_T)file_size;
 
       /* non-perfect check for overflow */
-      if ((off_t)rettv->vval.v_number != (off_t)st.st_size)
+      if ((off_t)rettv->vval.v_number != file_size) {
         rettv->vval.v_number = -2;
+      }
     }
-  } else
+  } else {
     rettv->vval.v_number = -1;
+  }
 }
 
 /*

src/os/fs.c

@@ -189,6 +189,16 @@ int os_file_is_writable(const char *name)
   return 0;
 }
 
+bool os_get_file_size(const char *name, off_t *size)
+{
+  uv_stat_t statbuf;
+  if (os_stat((char_u *)name, &statbuf) == OK) {
+    *size = statbuf.st_size;
+    return true;
+  }
+  return false;
+}
+
 int os_rename(const char_u *path, const char_u *new_path)
 {
   uv_fs_t request;

src/os/os.h

@@ -58,6 +58,12 @@ bool os_file_is_readonly(const char *name);
 /// @return `2` for a directory which we have rights to write into.
 int os_file_is_writable(const char *name);
 
+/// Get the size of a file in bytes.
+///
+/// @param[out] size pointer to an off_t to put the size into.
+/// @return `true` for success, `false` for failure.
+bool os_get_file_size(const char *name, off_t *size);
+
 /// Rename a file or directory.
 ///
 /// @return `OK` for success, `FAIL` for failure.