refactor: replace char_u with char

Work on https://github.com/neovim/neovim/issues/459

src/nvim/api/autocmd.c

@@ -240,7 +240,7 @@ Array nvim_get_autocmds(Dict(get_autocmds) *opts, Error *err)
           assert(pattern_filters[i]);
 
           char *pat = pattern_filters[i];
-          int patlen = (int)STRLEN(pat);
+          int patlen = (int)strlen(pat);
 
           if (aupat_is_buflocal(pat, patlen)) {
             aupat_normalize_buflocal_pat(pattern_buflocal,

src/nvim/api/command.c

@@ -105,7 +105,7 @@ Dictionary nvim_parse_cmd(String str, Dictionary opts, Error *err)
 
   // Parse arguments
   Array args = ARRAY_DICT_INIT;
-  size_t length = STRLEN(ea.arg);
+  size_t length = strlen(ea.arg);
 
   // For nargs = 1 or '?', pass the entire argument list as a single argument,
   // otherwise split arguments by whitespace.

src/nvim/api/extmark.c

@@ -742,7 +742,7 @@ Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer
       line = buf->b_ml.ml_line_count;
     }
   } else if (line < buf->b_ml.ml_line_count) {
-    len = ephemeral ? MAXCOL : STRLEN(ml_get_buf(buf, (linenr_T)line + 1, false));
+    len = ephemeral ? MAXCOL : strlen(ml_get_buf(buf, (linenr_T)line + 1, false));
   }
 
   if (col == -1) {
@@ -761,7 +761,7 @@ Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer
 
   if (col2 >= 0) {
     if (line2 >= 0 && line2 < buf->b_ml.ml_line_count) {
-      len = ephemeral ? MAXCOL : STRLEN(ml_get_buf(buf, (linenr_T)line2 + 1, false));
+      len = ephemeral ? MAXCOL : strlen(ml_get_buf(buf, (linenr_T)line2 + 1, false));
     } else if (line2 == buf->b_ml.ml_line_count) {
       // We are trying to add an extmark past final newline
       len = 0;
@@ -1106,7 +1106,7 @@ static int init_sign_text(char **sign_text, char *text)
 {
   char *s;
 
-  char *endp = text + (int)STRLEN(text);
+  char *endp = text + (int)strlen(text);
 
   // Count cells and check for non-printable chars
   int cells = 0;

src/nvim/api/ui.c

@@ -122,7 +122,7 @@ static char *mpack_array_dyn16(char **buf)
 static void mpack_str(char **buf, const char *str)
 {
   assert(sizeof(schar_T) - 1 < 0x20);
-  size_t len = STRLEN(str);
+  size_t len = strlen(str);
   mpack_w(buf, 0xa0 | len);
   memcpy(*buf, str, len);
   *buf += len;

src/nvim/api/vimscript.c

@@ -304,7 +304,7 @@ Object nvim_call_dict_function(Object dict, String fn, Array args, Error *err)
     }
     fn = (String) {
       .data = di->di_tv.vval.v_string,
-      .size = STRLEN(di->di_tv.vval.v_string),
+      .size = strlen(di->di_tv.vval.v_string),
     };
   }