1 /* Standard include files. stdio.h is required. */
2 #include <stdlib.h>
3 #include <unistd.h>
4 #include <string.h>
5 #include <locale.h>
6
7 /* Used for select(2) */
8 #include <sys/types.h>
9 #include <sys/select.h>
10
11 #include <signal.h>
12
13 #include <errno.h>
14 #include <stdio.h>
15
16 /* Standard readline include files. */
17 #if defined (READLINE_LIBRARY)
18 # include "readline.h"
19 # include "history.h"
20 #else
21 # include <readline/readline.h>
22 # include <readline/history.h>
23 #endif
24
25 extern int errno;
26
27 static void cb_linehandler (char *);
28 static void signandler (int);
29
30 int running, sigwinch_received;
31 const char *prompt = "rltest$ ";
32
33 /* Handle SIGWINCH and window size changes when readline is not active and
34 reading a character. */
35 static void
sighandler(int sig)36 sighandler (int sig)
37 {
38 sigwinch_received = 1;
39 }
40
41 /* Callback function called for each line when accept-line executed, EOF
42 seen, or EOF character read. This sets a flag and returns; it could
43 also call exit(3). */
44 static void
cb_linehandler(char * line)45 cb_linehandler (char *line)
46 {
47 /* Can use ^D (stty eof) or `exit' to exit. */
48 if (line == NULL || strcmp (line, "exit") == 0)
49 {
50 if (line == 0)
51 printf ("\n");
52 printf ("exit\n");
53 /* This function needs to be called to reset the terminal settings,
54 and calling it from the line handler keeps one extra prompt from
55 being displayed. */
56 rl_callback_handler_remove ();
57
58 running = 0;
59 }
60 else
61 {
62 if (*line)
63 add_history (line);
64 printf ("input line: %s\n", line);
65 free (line);
66 }
67 }
68
69 int
main(int c,char ** v)70 main (int c, char **v)
71 {
72 fd_set fds;
73 int r;
74
75
76 setlocale (LC_ALL, "");
77
78 /* Handle SIGWINCH */
79 signal (SIGWINCH, sighandler);
80
81 /* Install the line handler. */
82 rl_callback_handler_install (prompt, cb_linehandler);
83
84 /* Enter a simple event loop. This waits until something is available
85 to read on readline's input stream (defaults to standard input) and
86 calls the builtin character read callback to read it. It does not
87 have to modify the user's terminal settings. */
88 running = 1;
89 while (running)
90 {
91 FD_ZERO (&fds);
92 FD_SET (fileno (rl_instream), &fds);
93
94 r = select (FD_SETSIZE, &fds, NULL, NULL, NULL);
95 if (r < 0 && errno != EINTR)
96 {
97 perror ("rltest: select");
98 rl_callback_handler_remove ();
99 break;
100 }
101 if (sigwinch_received)
102 {
103 rl_resize_terminal ();
104 sigwinch_received = 0;
105 }
106 if (r < 0)
107 continue;
108
109 if (FD_ISSET (fileno (rl_instream), &fds))
110 rl_callback_read_char ();
111 }
112
113 printf ("rltest: Event loop has exited\n");
114 return 0;
115 }
116