(subshell_prompt): changed to GString.

(read_subshell_prompt): refactoring to ret rid of low-level memory reallocation.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

src/filemanager/layout.c

@@ -816,7 +816,7 @@ setup_cmdline (void)
 
 #ifdef ENABLE_SUBSHELL
     if (mc_global.tty.use_subshell)
-        tmp_prompt = strip_ctrl_codes (subshell_prompt);
+        tmp_prompt = strip_ctrl_codes (subshell_prompt->str);
     if (tmp_prompt == NULL)
 #endif
         tmp_prompt = (char *) mc_prompt;

src/main.c

@@ -376,16 +376,8 @@ main (int argc, char *argv[])
     if (mc_global.tty.alternate_plus_minus)
         application_keypad_mode ();
 
-#ifdef ENABLE_SUBSHELL
-    if (mc_global.tty.use_subshell)
-    {
-        mc_prompt = strip_ctrl_codes (subshell_prompt);
-        if (mc_prompt == NULL)
-            mc_prompt = (geteuid () == 0) ? "# " : "$ ";
-    }
-    else
-#endif /* ENABLE_SUBSHELL */
-        mc_prompt = (geteuid () == 0) ? "# " : "$ ";
+    /* subshell_prompt is NULL here */
+    mc_prompt = (geteuid () == 0) ? "# " : "$ ";
 
     if (config_migrated)
     {

src/subshell.c

@@ -75,7 +75,7 @@
 enum subshell_state_enum subshell_state;
 
 /* Holds the latest prompt captured from the subshell */
-char *subshell_prompt = NULL;
+GString *subshell_prompt = NULL;
 
 /* Subshell: if set, then the prompt was not saved on CONSOLE_SAVE */
 /* We need to paint it after CONSOLE_RESTORE, see: load_prompt */
@@ -984,24 +984,23 @@ invoke_subshell (const char *command, int how, vfs_path_t ** new_dir_vpath)
 gboolean
 read_subshell_prompt (void)
 {
-    static int prompt_size = INITIAL_PROMPT_SIZE;
-    int bytes = 0, i, rc = 0;
+    int rc = 0;
+    ssize_t bytes = 0;
     struct timeval timeleft = { 0, 0 };
 
     fd_set tmp;
     FD_ZERO (&tmp);
     FD_SET (mc_global.tty.subshell_pty, &tmp);
 
+    /* First time through */
     if (subshell_prompt == NULL)
-    {                           /* First time through */
-        subshell_prompt = g_malloc (prompt_size);
-        *subshell_prompt = '\0';
-        prompt_pos = 0;
-    }
+        subshell_prompt = g_string_sized_new (INITIAL_PROMPT_SIZE);
 
     while (subshell_alive
-           && (rc = select (mc_global.tty.subshell_pty + 1, &tmp, NULL, NULL, &timeleft)))
+           && (rc = select (mc_global.tty.subshell_pty + 1, &tmp, NULL, NULL, &timeleft)) != 0)
     {
+        ssize_t i;
+
         /* Check for `select' errors */
         if (rc == -1)
         {
@@ -1020,23 +1019,12 @@ read_subshell_prompt (void)
         bytes = read (mc_global.tty.subshell_pty, pty_buffer, sizeof (pty_buffer));
 
         /* Extract the prompt from the shell output */
-
-        for (i = 0; i < bytes; ++i)
+        g_string_set_size (subshell_prompt, 0);
+        for (i = 0; i < bytes; i++)
             if (pty_buffer[i] == '\n' || pty_buffer[i] == '\r')
-            {
-                prompt_pos = 0;
-            }
-            else
-            {
-                if (!pty_buffer[i])
-                    continue;
-
-                subshell_prompt[prompt_pos++] = pty_buffer[i];
-                if (prompt_pos == prompt_size)
-                    subshell_prompt = g_realloc (subshell_prompt, prompt_size *= 2);
-            }
-
-        subshell_prompt[prompt_pos] = '\0';
+                g_string_set_size (subshell_prompt, 0);
+            else if (pty_buffer[i] != '\0')
+                g_string_append_c (subshell_prompt, pty_buffer[i]);
     }
 
     return (rc != 0 || bytes != 0);
@@ -1049,7 +1037,7 @@ do_update_prompt (void)
 {
     if (update_subshell_prompt)
     {
-        printf ("\r\n%s", subshell_prompt);
+        printf ("\r\n%s", subshell_prompt->str);
         fflush (stdout);
         update_subshell_prompt = FALSE;
     }
@@ -1077,7 +1065,7 @@ exit_subshell (void)
                          tcsh_fifo, unix_error_string (errno));
         }
 
-        g_free (subshell_prompt);
+        g_string_free (subshell_prompt, TRUE);
         subshell_prompt = NULL;
         pty_buffer[0] = '\0';
     }

src/subshell.h

@@ -32,7 +32,7 @@ enum
 extern enum subshell_state_enum subshell_state;
 
 /* Holds the latest prompt captured from the subshell */
-extern char *subshell_prompt;
+extern GString *subshell_prompt;
 
 extern gboolean update_subshell_prompt;