patch 8.1.2021: some global functions can be local to the file

Problem:    Some global functions can be local to the file.
Solution:   Add "static". (Yegappan Lakshmanan, closes #4917)

src/ex_cmds2.c

@@ -260,7 +260,7 @@ check_due_timer(void)
 /*
  * Find a timer by ID.  Returns NULL if not found;
  */
-    timer_T *
+    static timer_T *
 find_timer(long id)
 {
     timer_T *timer;
@@ -291,7 +291,7 @@ stop_timer(timer_T *timer)
     }
 }
 
-    void
+    static void
 stop_all_timers(void)
 {
     timer_T *timer;
@@ -304,7 +304,7 @@ stop_all_timers(void)
     }
 }
 
-    void
+    static void
 add_timer_info(typval_T *rettv, timer_T *timer)
 {
     list_T	*list = rettv->vval.v_list;
@@ -338,7 +338,7 @@ add_timer_info(typval_T *rettv, timer_T *timer)
     }
 }
 
-    void
+    static void
 add_timer_info_all(typval_T *rettv)
 {
     timer_T *timer;

src/filepath.c

@@ -793,7 +793,7 @@ f_filewritable(typval_T *argvars, typval_T *rettv)
     rettv->vval.v_number = filewritable(tv_get_string(&argvars[0]));
 }
 
-    void
+    static void
 findfilendir(
     typval_T	*argvars UNUSED,
     typval_T	*rettv,

src/hangulin.c

@@ -809,7 +809,7 @@ hangul_input_process(char_u *s, int len)
     return len;
 }
 
-    void
+    static void
 hangul_input_clear(void)
 {
     sp = 0;

src/mbyte.c

@@ -144,6 +144,7 @@ static int utf_ptr2cells_len(char_u *p, int size);
 static int dbcs_char2cells(int c);
 static int dbcs_ptr2cells_len(char_u *p, int size);
 static int dbcs_ptr2char(char_u *p);
+static int dbcs_head_off(char_u *base, char_u *p);
 
 /*
  * Lookup table to quickly get the length in bytes of a UTF-8 character from
@@ -3778,7 +3779,7 @@ latin_head_off(char_u *base UNUSED, char_u *p UNUSED)
     return 0;
 }
 
-    int
+    static int
 dbcs_head_off(char_u *base, char_u *p)
 {
     char_u	*q;

src/misc1.c

@@ -2761,7 +2761,7 @@ done:
 
 # if defined(FEAT_EVAL) || defined(PROTO)
 
-    void
+    static void
 get_cmd_output_as_rettv(
     typval_T	*argvars,
     typval_T	*rettv,

src/os_unix.c

@@ -4276,7 +4276,7 @@ open_pty(int *pty_master_fd, int *pty_slave_fd, char_u **name1, char_u **name2)
 /*
  * Send SIGINT to a child process if "c" is an interrupt character.
  */
-    void
+    static void
 may_send_sigint(int c UNUSED, pid_t pid UNUSED, pid_t wpid UNUSED)
 {
 # ifdef SIGINT

src/proto/ex_cmds2.pro

@@ -2,11 +2,7 @@
 long proftime_time_left(proftime_T *due, proftime_T *now);
 timer_T *create_timer(long msec, int repeat);
 long check_due_timer(void);
-timer_T *find_timer(long id);
 void stop_timer(timer_T *timer);
-void stop_all_timers(void);
-void add_timer_info(typval_T *rettv, timer_T *timer);
-void add_timer_info_all(typval_T *rettv);
 int set_ref_in_timer(int copyID);
 void timer_free_all(void);
 void f_timer_info(typval_T *argvars, typval_T *rettv);

src/proto/filepath.pro

@@ -6,7 +6,6 @@ void f_executable(typval_T *argvars, typval_T *rettv);
 void f_exepath(typval_T *argvars, typval_T *rettv);
 void f_filereadable(typval_T *argvars, typval_T *rettv);
 void f_filewritable(typval_T *argvars, typval_T *rettv);
-void findfilendir(typval_T *argvars, typval_T *rettv, int find_what);
 void f_finddir(typval_T *argvars, typval_T *rettv);
 void f_findfile(typval_T *argvars, typval_T *rettv);
 void f_fnamemodify(typval_T *argvars, typval_T *rettv);

src/proto/hangulin.pro

@@ -5,7 +5,6 @@ int im_get_status(void);
 void hangul_input_state_toggle(void);
 void hangul_keyboard_set(void);
 int hangul_input_process(char_u *s, int len);
-void hangul_input_clear(void);
 char_u *hangul_string_convert(char_u *buf, int *p_len);
 char_u *hangul_composing_buffer_get(int *p_len);
 /* vim: set ft=c : */

src/proto/mbyte.pro

@@ -50,7 +50,6 @@ int utf_isupper(int a);
 int mb_strnicmp(char_u *s1, char_u *s2, size_t nn);
 void show_utf8(void);
 int latin_head_off(char_u *base, char_u *p);
-int dbcs_head_off(char_u *base, char_u *p);
 int dbcs_screen_head_off(char_u *base, char_u *p);
 int utf_head_off(char_u *base, char_u *p);
 void mb_copy_char(char_u **fp, char_u **tp);

src/proto/misc1.pro

@@ -48,7 +48,6 @@ void preserve_exit(void);
 void line_breakcheck(void);
 void fast_breakcheck(void);
 char_u *get_cmd_output(char_u *cmd, char_u *infile, int flags, int *ret_len);
-void get_cmd_output_as_rettv(typval_T *argvars, typval_T *rettv, int retlist);
 void f_system(typval_T *argvars, typval_T *rettv);
 void f_systemlist(typval_T *argvars, typval_T *rettv);
 int goto_im(void);

src/proto/os_unix.pro

@@ -59,7 +59,6 @@ int mch_get_shellsize(void);
 int mch_report_winsize(int fd, int rows, int cols);
 void mch_set_shellsize(void);
 void mch_new_shellsize(void);
-void may_send_sigint(int c, pid_t pid, pid_t wpid);
 int mch_call_shell(char_u *cmd, int options);
 void mch_job_start(char **argv, job_T *job, jobopt_T *options, int is_terminal);
 char *mch_job_status(job_T *job);

src/proto/terminal.pro

@@ -56,7 +56,6 @@ void f_term_start(typval_T *argvars, typval_T *rettv);
 void f_term_wait(typval_T *argvars, typval_T *rettv);
 void term_send_eof(channel_T *ch);
 job_T *term_getjob(term_T *term);
-void term_free_conpty(term_T *term);
 int use_conpty(void);
 int terminal_enabled(void);
 /* vim: set ft=c : */

src/proto/undo.pro

@@ -7,7 +7,6 @@ int u_savedel(linenr_T lnum, long nlines);
 int undo_allowed(void);
 int u_savecommon(linenr_T top, linenr_T bot, linenr_T newbot, int reload);
 void u_compute_hash(char_u *hash);
-char_u *u_get_undo_file_name(char_u *buf_ffname, int reading);
 void u_write_undo(char_u *name, int forceit, buf_T *buf, char_u *hash);
 void u_read_undo(char_u *name, char_u *hash, char_u *orig_name);
 void u_undo(int count);
@@ -27,7 +26,6 @@ int bufIsChanged(buf_T *buf);
 int anyBufIsChanged(void);
 int bufIsChangedNotTerm(buf_T *buf);
 int curbufIsChanged(void);
-void u_eval_tree(u_header_T *first_uhp, list_T *list);
 void f_undofile(typval_T *argvars, typval_T *rettv);
 void f_undotree(typval_T *argvars, typval_T *rettv);
 /* vim: set ft=c : */

src/pty.c

@@ -347,7 +347,7 @@ mch_openpty(char **ttyn)
 #define PTY_DONE
 
 #ifdef _IBMR2
-int aixhack = -1;
+static int aixhack = -1;
 #endif
 
     int

src/terminal.c

@@ -875,7 +875,7 @@ free_scrollback(term_T *term)
 
 
 // Terminals that need to be freed soon.
-term_T	*terminals_to_free = NULL;
+static term_T	*terminals_to_free = NULL;
 
 /*
  * Free a terminal and everything it refers to.
@@ -6024,7 +6024,7 @@ conpty_term_report_winsize(term_T *term, int rows, int cols)
     pResizePseudoConsole(term->tl_conpty, consize);
 }
 
-    void
+    static void
 term_free_conpty(term_T *term)
 {
     if (term->tl_siex.lpAttributeList != NULL)

src/undo.c

@@ -775,7 +775,7 @@ u_compute_hash(char_u *hash)
  * When "reading" is FALSE use the first name where the directory exists.
  * Returns NULL when there is no place to write or no file to read.
  */
-    char_u *
+    static char_u *
 u_get_undo_file_name(char_u *buf_ffname, int reading)
 {
     char_u	*dirp;
@@ -3590,7 +3590,7 @@ curbufIsChanged(void)
  * For undotree(): Append the list of undo blocks at "first_uhp" to "list".
  * Recursive.
  */
-    void
+    static void
 u_eval_tree(u_header_T *first_uhp, list_T *list)
 {
     u_header_T  *uhp = first_uhp;

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2021,
 /**/
     2020,
 /**/