Bash-4.3 distribution sources and documentation

lib/readline/examples/excallback.c

@@ -40,13 +40,14 @@ Copyright (C) 1999 Jeff Solomon
 #include <config.h>
 #endif
 
-#include <stdio.h>
 #include <sys/types.h>
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#include <stdlib.h>
 
+#include <stdio.h>
 #include <termios.h>	/* xxx - should make this more general */
 
 #ifdef READLINE_LIBRARY
@@ -55,6 +56,10 @@ Copyright (C) 1999 Jeff Solomon
 #  include <readline/readline.h>
 #endif
 
+#ifndef STDIN_FILENO
+#  define STDIN_FILENO 0
+#endif
+
 /* This little examples demonstrates the alternate interface to using readline.
  * In the alternate interface, the user maintains control over program flow and
  * only calls readline when STDIN is readable. Using the alternate interface,

lib/readline/examples/rl-callbacktest.c

@@ -0,0 +1,81 @@
+/* Standard include files. stdio.h is required. */
+#include <stdlib.h>
+#include <unistd.h>
+
+/* Used for select(2) */
+#include <sys/types.h>
+#include <sys/select.h>
+
+#include <stdio.h>
+
+/* Standard readline include files. */
+#include <readline/readline.h>
+#include <readline/history.h>
+
+static void cb_linehandler (char *);
+
+int running;
+const char *prompt = "rltest$ ";
+
+/* Callback function called for each line when accept-line executed, EOF
+   seen, or EOF character read.  This sets a flag and returns; it could
+   also call exit(3). */
+static void
+cb_linehandler (char *line)
+{
+  /* Can use ^D (stty eof) or `exit' to exit. */
+  if (line == NULL || strcmp (line, "exit") == 0)
+    {
+      if (line == 0)
+        printf ("\n");
+      printf ("exit\n");
+      /* This function needs to be called to reset the terminal settings,
+	 and calling it from the line handler keeps one extra prompt from
+	 being displayed. */
+      rl_callback_handler_remove ();
+
+      running = 0;
+    }
+  else
+    {
+      if (*line)
+	add_history (line);
+      printf ("input line: %s\n", line);
+      free (line);
+    }
+}
+
+int
+main (int c, char **v)
+{
+  fd_set fds;
+  int r;
+
+  /* Install the line handler. */
+  rl_callback_handler_install (prompt, cb_linehandler);
+
+  /* Enter a simple event loop.  This waits until something is available
+     to read on readline's input stream (defaults to standard input) and
+     calls the builtin character read callback to read it.  It does not
+     have to modify the user's terminal settings. */
+  running = 1;
+  while (running)
+    {
+      FD_ZERO (&fds);
+      FD_SET (fileno (rl_instream), &fds);    
+
+      r = select (FD_SETSIZE, &fds, NULL, NULL, NULL);
+      if (r < 0)
+	{
+	  perror ("rltest: select");
+	  rl_callback_handler_remove ();
+	  break;
+	}
+
+      if (FD_ISSET (fileno (rl_instream), &fds))
+	rl_callback_read_char ();
+    }
+
+  printf ("rltest: Event loop has exited\n");
+  return 0;
+}