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-rw-r--r--examples/rl-callbacktest.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/examples/rl-callbacktest.c b/examples/rl-callbacktest.c
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+/* Standard include files. stdio.h is required. */
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <locale.h>
+
+/* Used for select(2) */
+#include <sys/types.h>
+#include <sys/select.h>
+
+#include <signal.h>
+
+#include <errno.h>
+#include <stdio.h>
+
+/* Standard readline include files. */
+#if defined (READLINE_LIBRARY)
+# include "readline.h"
+# include "history.h"
+#else
+# include <readline/readline.h>
+# include <readline/history.h>
+#endif
+
+extern int errno;
+
+static void cb_linehandler (char *);
+static void signandler (int);
+
+int running, sigwinch_received;
+const char *prompt = "rltest$ ";
+
+/* Handle SIGWINCH and window size changes when readline is not active and
+ reading a character. */
+static void
+sighandler (int sig)
+{
+ sigwinch_received = 1;
+}
+
+/* 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;
+
+
+ setlocale (LC_ALL, "");
+
+ /* Handle SIGWINCH */
+ signal (SIGWINCH, sighandler);
+
+ /* 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 && errno != EINTR)
+ {
+ perror ("rltest: select");
+ rl_callback_handler_remove ();
+ break;
+ }
+ if (sigwinch_received)
+ {
+ rl_resize_terminal ();
+ sigwinch_received = 0;
+ }
+ if (r < 0)
+ continue;
+
+ if (FD_ISSET (fileno (rl_instream), &fds))
+ rl_callback_read_char ();
+ }
+
+ printf ("rltest: Event loop has exited\n");
+ return 0;
+}