*: Fix some Windows-specific warnings

Also fixed an error in path_fnamecmp().

src/nvim/api/buffer.c

@@ -395,10 +395,10 @@ void nvim_buf_set_lines(uint64_t channel_id,
     mark_adjust((linenr_T)start, (linenr_T)(end - 1), MAXLNUM, extra);
   }
 
-  changed_lines((linenr_T)start, 0, (linenr_T)end, extra);
+  changed_lines((linenr_T)start, 0, (linenr_T)end, (long)extra);
 
   if (save_curbuf.br_buf == NULL) {
-    fix_cursor((linenr_T)start, (linenr_T)end, extra);
+    fix_cursor((linenr_T)start, (linenr_T)end, (linenr_T)extra);
   }
 
 end:

src/nvim/event/rstream.c

@@ -89,7 +89,10 @@ static void on_rbuffer_nonfull(RBuffer *buf, void *data)
 static void alloc_cb(uv_handle_t *handle, size_t suggested, uv_buf_t *buf)
 {
   Stream *stream = handle->data;
-  buf->base = rbuffer_write_ptr(stream->buffer, &buf->len);
+  // `uv_buf_t.len` happens to have different size on Windows.
+  size_t write_count;
+  buf->base = rbuffer_write_ptr(stream->buffer, &write_count);
+  buf->len = write_count;
 }
 
 // Callback invoked by libuv after it copies the data into the buffer provided
@@ -136,7 +139,10 @@ static void fread_idle_cb(uv_idle_t *handle)
   uv_fs_t req;
   Stream *stream = handle->data;
 
-  stream->uvbuf.base = rbuffer_write_ptr(stream->buffer, &stream->uvbuf.len);
+  // `uv_buf_t.len` happens to have different size on Windows.
+  size_t write_count;
+  stream->uvbuf.base = rbuffer_write_ptr(stream->buffer, &write_count);
+  stream->uvbuf.len = write_count;
 
   // the offset argument to uv_fs_read is int64_t, could someone really try
   // to read more than 9 quintillion (9e18) bytes?

src/nvim/ex_getln.c

@@ -579,7 +579,7 @@ static int command_line_execute(VimState *state, int key)
         }
         if (vim_ispathsep(ccline.cmdbuff[s->j])
 #ifdef BACKSLASH_IN_FILENAME
-            && vim_strchr(" *?[{`$%#", ccline.cmdbuff[s->j + 1])
+            && strchr(" *?[{`$%#", ccline.cmdbuff[s->j + 1])
             == NULL
 #endif
             ) {

src/nvim/file_search.c

@@ -322,8 +322,11 @@ vim_findfile_init (
       drive[0] = path[0];
       drive[1] = ':';
       drive[2] = NUL;
-      if (vim_FullName(drive, ff_expand_buffer, MAXPATHL, TRUE) == FAIL)
+      if (vim_FullName((const char *)drive, (char *)ff_expand_buffer, MAXPATHL,
+                       true)
+          == FAIL) {
         goto error_return;
+      }
       path += 2;
     } else
 #endif

src/nvim/fileio.c

@@ -5207,7 +5207,7 @@ void forward_slash(char_u *fname)
 {
   char_u      *p;
 
-  if (path_with_url(fname)) {
+  if (path_with_url((const char *)fname)) {
     return;
   }
   for (p = fname; *p != NUL; p++) {

src/nvim/indent_c.c

@@ -174,7 +174,7 @@ static char_u *skip_string(char_u *p)
         char_u *paren = vim_strchr(delim, '(');
 
         if (paren != NULL) {
-            ptrdiff_t delim_len = paren - delim;
+            const ptrdiff_t delim_len = paren - delim;
 
             for (p += 3; *p; ++p)
                 if (p[0] == ')' && STRNCMP(p + 1, delim, delim_len) == 0

src/nvim/os/env.c

@@ -18,6 +18,7 @@
 #include "nvim/eval.h"
 #include "nvim/ex_getln.h"
 #include "nvim/version.h"
+#include "nvim/fileio.h"
 
 #ifdef WIN32
 #include "nvim/mbyte.h"  // for utf8_to_utf16, utf16_to_utf8

src/nvim/os/pty_process_win.h

@@ -12,8 +12,9 @@ typedef struct pty_process {
 #define pty_process_spawn(job) libuv_process_spawn((LibuvProcess *)job)
 #define pty_process_close(job) libuv_process_close((LibuvProcess *)job)
 #define pty_process_close_master(job) libuv_process_close((LibuvProcess *)job)
-#define pty_process_resize(job, width, height)
-#define pty_process_teardown(loop)
+#define pty_process_resize(job, width, height) ( \
+    (void)job, (void)width, (void)height, 0)
+#define pty_process_teardown(loop) ((void)loop, 0)
 
 static inline PtyProcess pty_process_init(Loop *loop, void *data)
 {

src/nvim/path.c

@@ -312,7 +312,7 @@ int path_fnamecmp(const char *fname1, const char *fname2)
 ///
 /// @return 0 if they are equal, non-zero otherwise.
 int path_fnamencmp(const char *const fname1, const char *const fname2,
-                   const size_t len)
+                   size_t len)
   FUNC_ATTR_NONNULL_ALL FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT
 {
 #ifdef BACKSLASH_IN_FILENAME
@@ -322,16 +322,16 @@ int path_fnamencmp(const char *const fname1, const char *const fname2,
   const char *p1 = fname1;
   const char *p2 = fname2;
   while (len > 0) {
-    c1 = PTR2CHAR(p1);
-    c2 = PTR2CHAR(p2);
-    if (c1 == NUL || c2 == NUL
-        || (!((c1 == '/' || c1 == '\\') && (c2 == '\\' || c2 == '/')))
-        || (p_fic ? (c1 != c2 && CH_FOLD(c1) != CH_FOLD(c2)) : c1 != c2)) {
+    c1 = PTR2CHAR((const char_u *)p1);
+    c2 = PTR2CHAR((const char_u *)p2);
+    if ((c1 == NUL || c2 == NUL
+         || (!((c1 == '/' || c1 == '\\') && (c2 == '\\' || c2 == '/'))))
+        && (p_fic ? (c1 != c2 && CH_FOLD(c1) != CH_FOLD(c2)) : c1 != c2)) {
       break;
     }
-    len -= MB_PTR2LEN(p1);
-    p1 += MB_PTR2LEN(p1);
-    p2 += MB_PTR2LEN(p2);
+    len -= MB_PTR2LEN((const char_u *)p1);
+    p1 += MB_PTR2LEN((const char_u *)p1);
+    p2 += MB_PTR2LEN((const char_u *)p2);
   }
   return c1 - c2;
 #else
@@ -819,7 +819,7 @@ static void expand_path_option(char_u *curdir, garray_T *gap)
       }
       STRMOVE(buf + len + 1, buf);
       STRCPY(buf, curdir);
-      buf[len] = PATHSEP;
+      buf[len] = (char_u)PATHSEP;
       simplify_filename(buf);
     }
 
@@ -1333,12 +1333,12 @@ static int expand_backtick(
 /// When the path looks like a URL leave it unmodified.
 void slash_adjust(char_u *p)
 {
-  if (path_with_url(p)) {
+  if (path_with_url((const char *)p)) {
     return;
   }
   while (*p) {
-    if (*p == psepcN) {
-      *p = psepc;
+    if (*p == (char_u)psepcN) {
+      *p = (char_u)psepc;
     }
     mb_ptr_adv(p);
   }