Use const char* instead of char*.

Reduce the number of warnings with -Wwrite-strings.
* src/xrdb.c (get_environ_db, get_system_name):
* src/unexelf.c (find_section):
* src/term.c (string_cost, string_cost_one_line, per_line_cost)
(get_named_tty, init_tty):
* src/sysdep.c (sys_subshell):
* src/sound.c (sound_perror, sound_warning, vox_open, vox_init)
(alsa_sound_perror, alsa_open, alsa_configure, alsa_init):
* src/search.c (Freplace_match):
* src/process.c (Fmake_network_process, send_process, init_process):
* src/lread.c (Fload, init_lread):
* src/keymap.c (Fdescribe_buffer_bindings, describe_map_tree):
* src/keyboard.c (parse_tool_bar_item, struct event_head):
* src/gtkutil.h (xg_get_font_name):
* src/gtkutil.c (get_dialog_title, create_dialog, xg_get_font_name)
(make_widget_for_menu_item, make_menu_item, create_menus)
(xg_make_tool_item):
* src/font.c (parse_matrix, font_parse_name):
* src/floatfns.c (rounding_driver, float_error_fn_name):
* src/filelock.c (get_boot_time_1, lock_file_1):
* src/fileio.c (barf_or_query_if_file_exists, check_writable):
* src/editfns.c (get_system_name, get_operating_system_release)
(Fencode_time, Fset_time_zone_rule):
* src/dispextern.h (string_cost, per_line_cost, get_named_tty, init_tty):
* src/buffer.c (defvar_per_buffer): Use const.

1 files changed, 5 insertions, 4 deletions

diff --git a/src/process.c b/src/process.c
index 36f5a7d5adb..4a658623077 100644
--- a/src/process.c
+++ b/src/process.c
@@ -180,7 +180,7 @@ extern Lisp_Object QCfilter;
 #define SIGCHLD SIGCLD
 #endif /* SIGCLD */
 
-extern char *get_operating_system_release (void);
+extern const char *get_operating_system_release (void);
 
 /* Serial processes require termios or Windows.  */
 #if defined (HAVE_TERMIOS) || defined (WINDOWSNT)
@@ -3033,7 +3033,8 @@ usage: (make-network-process &rest ARGS)  */)
 #ifdef HAVE_GETADDRINFO
   struct addrinfo ai, *res, *lres;
   struct addrinfo hints;
-  char *portstring, portbuf[128];
+  const char *portstring;
+  char portbuf[128];
 #else /* HAVE_GETADDRINFO */
   struct _emacs_addrinfo
   {
@@ -5415,7 +5416,7 @@ send_process_trap (int ignore)
    This function can evaluate Lisp code and can garbage collect.  */
 
 static void
-send_process (volatile Lisp_Object proc, unsigned char *volatile buf,
+send_process (volatile Lisp_Object proc, const unsigned char *volatile buf,
               volatile int len, volatile Lisp_Object object)
 {
   /* Use volatile to protect variables from being clobbered by longjmp.  */
@@ -7423,7 +7424,7 @@ init_process (void)
      processes.  As such, we only change the default value.  */
  if (initialized)
   {
-    char *release = get_operating_system_release ();
+    const char *release = get_operating_system_release ();
     if (!release || !release[0] || (release[0] < MIN_PTY_KERNEL_VERSION
                                     && release[1] == '.')) {
       Vprocess_connection_type = Qnil;