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Diffstat (limited to 'examples/rl-timeout.c')
| -rw-r--r-- | examples/rl-timeout.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/examples/rl-timeout.c b/examples/rl-timeout.c new file mode 100644 index 0000000..b8a24ba --- /dev/null +++ b/examples/rl-timeout.c @@ -0,0 +1,245 @@ +/* rl-timeout: test various readline builtin timeouts. */ + +/* Copyright (C) 2021 Free Software Foundation, Inc. + + This file is part of the GNU Readline Library (Readline), a library for + reading lines of text with interactive input and history editing. + + Readline is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Readline is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with readline. If not, see <http://www.gnu.org/licenses/>. +*/ + +/* Standard include files. stdio.h is required. */ +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <limits.h> + +/* Used for select(2) */ +#include <sys/types.h> +#include <sys/select.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 *); + +int timeout_secs = 1, timeout_usecs = 0; +int running; +const char *prompt = "rl-timeout$ "; + +/* **************************************************************** */ +/* */ +/* Example 1: readline () with rl_readline_state */ +/* */ +/* **************************************************************** */ + +void +rltest_timeout_readline1 () +{ + const char *temp; + + rl_set_timeout (timeout_secs, timeout_usecs); + temp = readline (prompt); + if (RL_ISSTATE (RL_STATE_TIMEOUT)) + printf ("timeout\n"); + else if (temp == NULL) + printf ("no input line\n"); + else + printf ("input line: %s\n", temp); + free ((void *) temp); +} + +/* **************************************************************** */ +/* */ +/* Example 2: readline () with rl_timeout_event_hook */ +/* */ +/* **************************************************************** */ + +static int +timeout_handler () +{ + printf ("timeout\n"); + return READERR; +} + +void +rltest_timeout_readline2 () +{ + const char *temp; + + rl_set_timeout (timeout_secs, timeout_usecs); + rl_timeout_event_hook = timeout_handler; + temp = readline (prompt); + if (temp == NULL) + printf ("no input line\n"); + else + printf ("input line: %s\n", temp); + free ((void *)temp); +} + +/* **************************************************************** */ +/* */ +/* Example 3: rl_callback_* () with rl_timeout_remaining */ +/* */ +/* **************************************************************** */ + +/* 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); + } +} + +void +rltest_timeout_callback1 () +{ + fd_set fds; + int r; + unsigned sec, usec; + + rl_set_timeout (timeout_secs, timeout_usecs); + rl_callback_handler_install (prompt, cb_linehandler); + running = 1; + while (running) + { + FD_ZERO (&fds); + FD_SET (fileno (rl_instream), &fds); + r = rl_timeout_remaining (&sec, &usec); + if (r == 1) + { + struct timeval timeout = {sec, usec}; + r = select (FD_SETSIZE, &fds, NULL, NULL, &timeout); + } + if (r < 0 && errno != EINTR) + { + perror ("rl-timeout: select"); + rl_callback_handler_remove (); + break; + } + else if (r == 0) + { + printf ("rl-timeout: timeout\n"); + rl_callback_handler_remove (); + break; + } + + if (FD_ISSET (fileno (rl_instream), &fds)) + rl_callback_read_char (); + } + + printf ("rl-timeout: Event loop has exited\n"); +} + +/* **************************************************************** */ +/* */ +/* Example 4: rl_callback_* () with rl_timeout_event_hook */ +/* */ +/* **************************************************************** */ + +static int +cb_timeouthandler () +{ + printf ("timeout\n"); + rl_callback_handler_remove (); + running = 0; + return READERR; +} + +void +rltest_timeout_callback2 () +{ + int r; + + rl_set_timeout (timeout_secs, timeout_usecs); + rl_timeout_event_hook = cb_timeouthandler; + rl_callback_handler_install (prompt, cb_linehandler); + running = 1; + while (running) + rl_callback_read_char (); + + printf ("rl-timeout: Event loop has exited\n"); +} + +int +main (int argc, char **argv) +{ + if (argc >= 2) + { + if (argc >= 3) + { + double timeout = atof (argv[2]); + if (timeout <= 0.0) + { + fprintf (stderr, "rl-timeout: specify a positive number for timeout.\n"); + return 2; + } + else if (timeout > UINT_MAX) + { + fprintf (stderr, "rl-timeout: timeout too large.\n"); + return 2; + } + timeout_secs = (unsigned) timeout; + timeout_usecs = (unsigned) ((timeout - timeout_secs) * 1000000 + 0.5); + } + + if (strcmp (argv[1], "readline1") == 0) + rltest_timeout_readline1 (); + else if (strcmp (argv[1], "readline2") == 0) + rltest_timeout_readline2 (); + else if (strcmp (argv[1], "callback1") == 0) + rltest_timeout_callback1 (); + else if (strcmp (argv[1], "callback2") == 0) + rltest_timeout_callback2 (); + else + return 2; + } + else + { + fprintf (stderr, "usage: rl-timeout [readline1 | readline2 | callback1 | callback2] [timeout]\n"); + return 2; + } + return 0; +} |