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Annotation of embedaddon/readline/examples/rl-callbacktest.c, revision 1.1

1.1     ! misho       1: /* Standard include files. stdio.h is required. */
        !             2: #include <stdlib.h>
        !             3: #include <unistd.h>
        !             4: #include <string.h>
        !             5: 
        !             6: /* Used for select(2) */
        !             7: #include <sys/types.h>
        !             8: #include <sys/select.h>
        !             9: 
        !            10: #include <stdio.h>
        !            11: 
        !            12: /* Standard readline include files. */
        !            13: #if defined (READLINE_LIBRARY)
        !            14: #  include "readline.h"
        !            15: #  include "history.h"
        !            16: #else
        !            17: #  include <readline/readline.h>
        !            18: #  include <readline/history.h>
        !            19: #endif
        !            20: 
        !            21: static void cb_linehandler (char *);
        !            22: 
        !            23: int running;
        !            24: const char *prompt = "rltest$ ";
        !            25: 
        !            26: /* Callback function called for each line when accept-line executed, EOF
        !            27:    seen, or EOF character read.  This sets a flag and returns; it could
        !            28:    also call exit(3). */
        !            29: static void
        !            30: cb_linehandler (char *line)
        !            31: {
        !            32:   /* Can use ^D (stty eof) or `exit' to exit. */
        !            33:   if (line == NULL || strcmp (line, "exit") == 0)
        !            34:     {
        !            35:       if (line == 0)
        !            36:         printf ("\n");
        !            37:       printf ("exit\n");
        !            38:       /* This function needs to be called to reset the terminal settings,
        !            39:         and calling it from the line handler keeps one extra prompt from
        !            40:         being displayed. */
        !            41:       rl_callback_handler_remove ();
        !            42: 
        !            43:       running = 0;
        !            44:     }
        !            45:   else
        !            46:     {
        !            47:       if (*line)
        !            48:        add_history (line);
        !            49:       printf ("input line: %s\n", line);
        !            50:       free (line);
        !            51:     }
        !            52: }
        !            53: 
        !            54: int
        !            55: main (int c, char **v)
        !            56: {
        !            57:   fd_set fds;
        !            58:   int r;
        !            59: 
        !            60:   /* Install the line handler. */
        !            61:   rl_callback_handler_install (prompt, cb_linehandler);
        !            62: 
        !            63:   /* Enter a simple event loop.  This waits until something is available
        !            64:      to read on readline's input stream (defaults to standard input) and
        !            65:      calls the builtin character read callback to read it.  It does not
        !            66:      have to modify the user's terminal settings. */
        !            67:   running = 1;
        !            68:   while (running)
        !            69:     {
        !            70:       FD_ZERO (&fds);
        !            71:       FD_SET (fileno (rl_instream), &fds);    
        !            72: 
        !            73:       r = select (FD_SETSIZE, &fds, NULL, NULL, NULL);
        !            74:       if (r < 0)
        !            75:        {
        !            76:          perror ("rltest: select");
        !            77:          rl_callback_handler_remove ();
        !            78:          break;
        !            79:        }
        !            80: 
        !            81:       if (FD_ISSET (fileno (rl_instream), &fds))
        !            82:        rl_callback_read_char ();
        !            83:     }
        !            84: 
        !            85:   printf ("rltest: Event loop has exited\n");
        !            86:   return 0;
        !            87: }