contrib/ncurses-5.4/test/filter.c

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  28
  29 /*
  30  * Author:  Thomas E. Dickey <dickey@clark.net> 1998
  31  *
  32  * $Id: filter.c,v 1.7 2002/03/23 23:02:15 tom Exp $
  33  */
  34 #include <test.priv.h>
  35
  36 /*
  37  * An example of the 'filter()' function in ncurses, this program prompts
  38  * for commands and executes them (like a command shell).  It illustrates
  39  * how ncurses can be used to implement programs that are not full-screen.
  40  *
  41  * Ncurses differs slightly from SVr4 curses.  The latter does not flush its
  42  * state when exiting program mode, so the attributes on the command lines of
  43  * this program 'bleed' onto the executed commands.  Rather than use the
  44  * reset_shell_mode() and reset_prog_mode() functions, we could invoke endwin()
  45  * and refresh(), but that does not work any better.
  46  */
  47
  48 static int
  49 new_command(char *buffer, int length, attr_t underline)
  50 {
  51     int code;
  52
  53     attron(A_BOLD);
  54     printw("Command: ");
  55     attron(underline);
  56     code = getnstr(buffer, length);
  57     attroff(underline);
  58     attroff(A_BOLD);
  59     printw("\n");
  60
  61     return code;
  62 }
  63
  64 int
  65 main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED)
  66 {
  67     char buffer[80];
  68     attr_t underline;
  69
  70     filter();
  71     (void) newterm((char *) 0, stdout, stdin);
  72     cbreak();
  73     keypad(stdscr, TRUE);
  74
  75     if (has_colors()) {
  76         int background = COLOR_BLACK;
  77         start_color();
  78 #if HAVE_USE_DEFAULT_COLORS
  79         if (use_default_colors() != ERR)
  80             background = -1;
  81 #endif
  82         init_pair(1, COLOR_CYAN, background);
  83         underline = COLOR_PAIR(1);
  84     } else {
  85         underline = A_UNDERLINE;
  86     }
  87
  88     while (new_command(buffer, sizeof(buffer) - 1, underline) != ERR
  89            && strlen(buffer) != 0) {
  90         reset_shell_mode();
  91         printf("\n");
  92         fflush(stdout);
  93         system(buffer);
  94         reset_prog_mode();
  95         touchwin(stdscr);
  96         erase();
  97         refresh();
  98     }
  99     printw("done");
 100     refresh();
 101     endwin();
 102     ExitProgram(EXIT_SUCCESS);
 103 }