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30 * Author: Thomas E. Dickey <dickey@clark.net> 1998
32 * $Id: filter.c,v 1.16 2014/08/09 22:35:51 tom Exp $
34 #include <test.priv.h>
39 * An example of the 'filter()' function in ncurses, this program prompts
40 * for commands and executes them (like a command shell). It illustrates
41 * how ncurses can be used to implement programs that are not full-screen.
43 * Ncurses differs slightly from SVr4 curses. The latter does not flush its
44 * state when exiting program mode, so the attributes on the command lines of
45 * this program 'bleed' onto the executed commands. Rather than use the
46 * reset_shell_mode() and reset_prog_mode() functions, we could invoke endwin()
47 * and refresh(), but that does not work any better.
51 new_command(char *buffer, int length, int underline)
58 code = getnstr(buffer, length);
60 * If this returns anything except ERR/OK, it would be one of ncurses's
61 * extensions. Fill the buffer with something harmless that the shell
62 * will execute as a comment.
65 if (code == KEY_EVENT)
66 strcpy(buffer, "# event!");
69 if (code == KEY_RESIZE) {
70 strcpy(buffer, "# resize!");
84 static const char *msg[] =
86 "Usage: filter [options]"
89 ," -i use initscr() rather than newterm()"
92 for (n = 0; n < SIZEOF(msg); n++)
93 fprintf(stderr, "%s\n", msg[n]);
94 ExitProgram(EXIT_FAILURE);
98 main(int argc, char *argv[])
103 bool i_option = FALSE;
105 setlocale(LC_ALL, "");
107 while ((ch = getopt(argc, argv, "i")) != -1) {
117 printf("starting filter program using %s...\n",
118 i_option ? "initscr" : "newterm");
123 (void) newterm((char *) 0, stdout, stdin);
126 keypad(stdscr, TRUE);
129 int background = COLOR_BLACK;
131 #if HAVE_USE_DEFAULT_COLORS
132 if (use_default_colors() != ERR)
135 init_pair(1, COLOR_CYAN, (short) background);
136 underline = COLOR_PAIR(1);
138 underline = A_UNDERLINE;
141 while (new_command(buffer, sizeof(buffer) - 1, underline) != ERR
142 && strlen(buffer) != 0) {
146 IGNORE_RC(system(buffer));
155 ExitProgram(EXIT_SUCCESS);
161 printf("This program requires the filter function\n");
162 ExitProgram(EXIT_FAILURE);
164 #endif /* HAVE_FILTER */