X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=test%2Fditto.c;h=4873d0d99ad932ddf2e101c46180723f50257f03;hp=96677b99a8519434661158ea7c4c50fbbeda2085;hb=ed530db2c5b10aa19d06104dfe82cf248a813860;hpb=f7b8e526e024ce141e61633e966255400de67772 diff --git a/test/ditto.c b/test/ditto.c index 96677b99..4873d0d9 100644 --- a/test/ditto.c +++ b/test/ditto.c @@ -1,5 +1,5 @@ /**************************************************************************** - * Copyright (c) 1998-2005,2007 Free Software Foundation, Inc. * + * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the * @@ -27,25 +27,70 @@ ****************************************************************************/ /* - * Author: Thomas E. Dickey 1998 + * Author: Thomas E. Dickey (1998-on) * - * $Id: ditto.c,v 1.8 2007/09/01 21:10:38 tom Exp $ + * $Id: ditto.c,v 1.26 2008/04/26 23:42:39 tom Exp $ * * The program illustrates how to set up multiple screens from a single - * program. Invoke the program by specifying another terminal on the same - * machine by specifying its device, e.g., + * program. + * + * If openpty() is supported, the command line parameters are titles for + * the windows showing each screen's data. + * + * If openpty() is not supported, you must invoke the program by specifying + * another terminal on the same machine by specifying its device, e.g., * ditto /dev/ttyp1 */ #include #include #include +#ifdef USE_XTERM_PTY +#include USE_OPENPTY_HEADER +#endif + +#define MAX_FIFO 256 + +#define THIS_FIFO(n) ((n) % MAX_FIFO) +#define NEXT_FIFO(n) THIS_FIFO((n) + 1) + +typedef struct { + unsigned long sequence; + int head; + int tail; + int data[MAX_FIFO]; +} FIFO; + +typedef struct { + unsigned long sequence; +} PEEK; + +/* + * Data "owned" for a single screen. Each screen is divided into windows that + * show the text read from each terminal. Input from a given screen will also + * be read into one window per screen. + */ typedef struct { FILE *input; FILE *output; - SCREEN *screen; + SCREEN *screen; /* this screen - curses internal data */ + int length; /* length of windows[] and peeks[] */ + char **titles; /* per-window titles */ + WINDOW **windows; /* display data from each screen */ + PEEK *peeks; /* indices for each screen's fifo */ + FIFO fifo; /* fifo for this screen */ } DITTO; +/* + * Structure used to pass multiple parameters via the use_screen() + * single-parameter interface. + */ +typedef struct { + int source; /* which screen did character come from */ + int target; /* which screen is character going to */ + DITTO *ditto; /* data for all screens */ +} DDATA; + static void failed(const char *s) { @@ -60,10 +105,60 @@ usage(void) ExitProgram(EXIT_FAILURE); } +/* Add to the head of the fifo, checking for overflow. */ +static void +put_fifo(FIFO * fifo, int value) +{ + int next = NEXT_FIFO(fifo->head); + if (next == fifo->tail) + fifo->tail = NEXT_FIFO(fifo->tail); + fifo->data[next] = value; + fifo->head = next; + fifo->sequence += 1; +} + +/* Get data from the tail (oldest part) of the fifo, returning -1 if no data. + * Since each screen can peek into the fifo, we do not update the tail index, + * but modify the peek-index. + * + * FIXME - test/workaround for case where fifo gets more than a buffer + * ahead of peek. + */ +static int +peek_fifo(FIFO * fifo, PEEK * peek) +{ + int result = -1; + if (peek->sequence < fifo->sequence) { + peek->sequence += 1; + result = fifo->data[THIS_FIFO(peek->sequence)]; + } + return result; +} + static FILE * open_tty(char *path) { FILE *fp; +#ifdef USE_XTERM_PTY + int amaster; + int aslave; + char slave_name[1024]; + char s_option[1024]; + char *leaf; + + if (openpty(&amaster, &aslave, slave_name, 0, 0) != 0) + failed("openpty"); + if ((leaf = strrchr(slave_name, '/')) == 0) { + errno = EISDIR; + failed(slave_name); + } + sprintf(s_option, "-S%s/%d", slave_name, aslave); + if (fork()) { + execlp("xterm", "xterm", s_option, "-title", path, (char *) 0); + _exit(0); + } + fp = fdopen(amaster, "r+"); +#else struct stat sb; if (stat(path, &sb) < 0) @@ -76,20 +171,134 @@ open_tty(char *path) if (fp == 0) failed(path); printf("opened %s\n", path); +#endif return fp; } static void -show_ditto(DITTO * data, int count, int which, int ch) +init_screen(SCREEN *sp GCC_UNUSED, void *arg) +{ + DITTO *target = (DITTO *) arg; + int high, wide; + int k; + + cbreak(); + noecho(); + scrollok(stdscr, TRUE); + nodelay(stdscr, TRUE); + box(stdscr, 0, 0); + + target->windows = typeCalloc(WINDOW *, target->length); + target->peeks = typeCalloc(PEEK, target->length); + + high = (LINES - 2) / target->length; + wide = (COLS - 2); + for (k = 0; k < target->length; ++k) { + WINDOW *outer = newwin(high, wide, 1 + (high * k), 1); + WINDOW *inner = derwin(outer, high - 2, wide - 2, 1, 1); + + box(outer, 0, 0); + mvwaddstr(outer, 0, 2, target->titles[k]); + wnoutrefresh(outer); + + scrollok(inner, TRUE); + nodelay(inner, TRUE); + keypad(inner, TRUE); + + target->windows[k] = inner; + } + doupdate(); +} + +static void +open_screen(DITTO * target, char **source, int length, int which) +{ + if (which != 0) { + target->input = + target->output = open_tty(source[which]); + } else { + target->input = stdin; + target->output = stdout; + } + + target->titles = source; + target->length = length; + target->screen = newterm((char *) 0, /* assume $TERM is the same */ + target->output, + target->input); + + if (target->screen == 0) + failed("newterm"); + + (void) USING_SCREEN(target->screen, init_screen, target); +} + +static int +close_screen(SCREEN *sp GCC_UNUSED, void *arg GCC_UNUSED) +{ + (void) sp; + (void) arg; + return endwin(); +} + +/* + * Read data from the 'source' screen. + */ +static int +read_screen(SCREEN *sp GCC_UNUSED, void *arg) +{ + DDATA *data = (DDATA *) arg; + DITTO *ditto = &(data->ditto[data->source]); + WINDOW *win = ditto->windows[data->source]; + int ch = wgetch(win); + + if (ch > 0 && ch < 256) + put_fifo(&(ditto->fifo), ch); + else + ch = ERR; + + return ch; +} + +/* + * Write all of the data that's in fifos for the 'target' screen. + */ +static int +write_screen(SCREEN *sp GCC_UNUSED, void *arg GCC_UNUSED) +{ + DDATA *data = (DDATA *) arg; + DITTO *ditto = &(data->ditto[data->target]); + bool changed = FALSE; + int which; + + for (which = 0; which < ditto->length; ++which) { + WINDOW *win = ditto->windows[which]; + FIFO *fifo = &(data->ditto[which].fifo); + PEEK *peek = &(ditto->peeks[which]); + int ch; + + while ((ch = peek_fifo(fifo, peek)) > 0) { + changed = TRUE; + + waddch(win, ch); + wnoutrefresh(win); + } + } + + if (changed) + doupdate(); + return OK; +} + +static void +show_ditto(DITTO * data, int count, DDATA * ddata) { int n; for (n = 0; n < count; n++) { - set_term(data[n].screen); - addch(UChar(ch)); - refresh(); + ddata->target = n; + USING_SCREEN(data[n].screen, write_screen, (void *) ddata); } - set_term(data[which].screen); } int @@ -103,30 +312,11 @@ main(int argc GCC_UNUSED, if (argc <= 1) usage(); - if ((data = (DITTO *) calloc((unsigned) argc, sizeof(DITTO))) == 0) + if ((data = typeCalloc(DITTO, argc)) == 0) failed("calloc data"); - data[0].input = stdin; - data[0].output = stdout; - for (j = 1; j < argc; j++) { - data[j].input = - data[j].output = open_tty(argv[j]); - } - - /* - * If we got this far, we have open connection(s) to the terminal(s). - * Set up the screens. - */ for (j = 0; j < argc; j++) { - data[j].screen = newterm((char *) 0, /* assume $TERM is the same */ - data[j].output, - data[j].input); - if (data[j].screen == 0) - failed("newterm"); - cbreak(); - noecho(); - scrollok(stdscr, TRUE); - nodelay(stdscr, TRUE); + open_screen(&data[j], argv, argc, j); } /* @@ -134,27 +324,37 @@ main(int argc GCC_UNUSED, * of the screens. */ for (count = 0;; ++count) { + DDATA ddata; int ch; int which = (count % argc); - set_term(data[which].screen); napms(20); - ch = getch(); - if (ch == ERR) { - /* echochar('.'); */ - continue; - } - if (ch == CTRL('D')) + + ddata.source = which; + ddata.ditto = data; + + ch = USING_SCREEN(data[which].screen, read_screen, &ddata); + if (ch == CTRL('D')) { break; - show_ditto(data, argc, which, ch); + } else if (ch != ERR) { + show_ditto(data, argc, &ddata); + } } /* * Cleanup and exit */ for (j = argc - 1; j >= 0; j--) { - set_term(data[j].screen); - endwin(); + USING_SCREEN(data[j].screen, close_screen, 0); + fprintf(data[j].output, "**Closed\r\n"); + + /* + * Closing before a delscreen() helps ncurses determine that there + * is no valid output buffer, and can remove the setbuf() data. + */ + fflush(data[j].output); + fclose(data[j].output); + delscreen(data[j].screen); } ExitProgram(EXIT_SUCCESS); }